PROSPECTUS

                                     [LOGO]

                               OFFER TO EXCHANGE
                ITS 10 3/8% SENIOR SUBORDINATED NOTES DUE 2011,
          WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
 FOR ANY AND ALL OF ITS OUTSTANDING 10 3/8% SENIOR SUBORDINATED NOTES DUE 2011

                                 -------------

THE EXCHANGE NOTES

    - The terms of the notes we are issuing will be substantially identical to
      the outstanding notes that we issued on April 10, 2001, except for the
      elimination of some transfer restrictions, registration rights and
      liquidated damages provisions relating to the outstanding notes.

    - The notes will bear interest at the rate of 10 3/8% per year. Interest on
      the notes is payable on April 15 and October 15 of each year, beginning on
      October 15, 2001. The notes will mature on April 15, 2011.

    - The notes are subject to redemption under the circumstances and at the
      prices described in this prospectus.

    - The notes will be unsecured senior subordinated obligations and will be
      subordinated in right of payment to all our existing and future senior
      debt, including our bank debt.

MATERIAL TERMS OF THE EXCHANGE OFFER

    - The exchange offer expires at 5:00 p.m., New York City time, on July 30,
      2001, unless extended.

    - Our completion of the exchange offer is subject to customary conditions,
      which we may waive.

    - Upon our completion of the exchange offer, all outstanding notes that are
      validly tendered and not withdrawn will be exchanged for an equal
      principal amount of notes that are registered under the Securities Act of
      1933.

    - Tenders of outstanding notes may be withdrawn at any time prior to the
      expiration of the exchange offer.

    - The exchange of registered notes for outstanding notes will not be a
      taxable exchange for U.S. Federal income tax purposes.

    - We will not receive any proceeds from the exchange offer.
                                 --------------

    FOR A DISCUSSION OF FACTORS THAT YOU SHOULD CONSIDER BEFORE PARTICIPATING IN
THIS EXCHANGE OFFER, SEE "RISK FACTORS" BEGINNING ON PAGE 9 OF THIS PROSPECTUS.
                                 -------------

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
                                 --------------

                 THE DATE OF THIS PROSPECTUS IS JUNE 28, 2001.

    WE HAVE NOT AUTHORIZED ANY DEALER, SALESMAN OR OTHER PERSON TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS. YOU MUST NOT RELY UPON ANY INFORMATION OR REPRESENTATION NOT
CONTAINED IN THIS PROSPECTUS AS IF WE HAD AUTHORIZED IT. THIS PROSPECTUS DOES
NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY
SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT RELATES, NOR DOES
THIS PROSPECTUS CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
BUY SECURITIES IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE
SUCH OFFER OR SOLICITATION.

                            ------------------------

                               TABLE OF CONTENTS


                                                           
Available Information.......................................     ii
Summary.....................................................      1
Risk Factors................................................      9
Forward Looking Statements..................................     19
Ratio of Earnings to Fixed Charges..........................     20
Use of Proceeds.............................................     20
Capitalization..............................................     21
Selected Consolidated Financial Data........................     22
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................     24
Business....................................................     33
Management..................................................     47
Certain Transactions........................................     55
Principal Stockholders......................................     57
Description of Certain Other Indebtedness...................     59
The Exchange Offer..........................................     62
Description of the Exchange Notes...........................     73
Material United States Income Tax Considerations............    114
Plan of Distribution........................................    119
Legal Matters...............................................    120
Experts.....................................................    120
Change of Accountants.......................................    120
Index to Consolidated Financial Statements..................    F-1


                                       i

                             AVAILABLE INFORMATION

    We have filed with the Securities and Exchange Commission a registration
statement on Form S-4 (including the exhibits and schedules thereto) under the
Securities Act and the rules and regulations thereunder, for the registration of
the notes offered hereby. This prospectus is part of the registration statement.
This prospectus does not contain all the information included in the
registration statement because we have omitted parts of the registration
statement as permitted by the Securities and Exchange Commission's rules and
regulations. For further information about us and the notes, you should refer to
the registration statement. Statements contained in this prospectus as to any
contract, agreement or other document referred to are not necessarily complete.
Where the contract or other document is an exhibit to the registration
statement, each statement is qualified by the provisions of that exhibit.

    You can inspect and copy all or any portion of the registration statements
or any reports, statements or other information we file at the public reference
facility maintained by the Securities and Exchange Commission at Room 1024, 450
Fifth Street, N.W., Washington, D.C. 20549, and at the SEC's regional offices at
Seven World Trade Center, 13th Floor, New York, New York 10048 and 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661. You may call the Securities
and Exchange Commission at 1-800-SEC-0330 for further information about the
operation of the public reference rooms. Copies of all or any portion of the
registration statement can be obtained from the Public Reference Section of the
Securities and Exchange Commission, 450 Fifth Street, N.W., Washington, D.C.
20549, at prescribed rates. In addition, the registration statement is publicly
available through the Securities and Exchange Commission's site on the
Internet's World Wide Web, located at http://www.sec.gov.

    In addition, for so long as any of the notes remain outstanding, we have
agreed to make available to any prospective purchaser of the notes or beneficial
owner of the notes in connection with any sale thereof the information required
by Rule 144A(d)(4) under the Securities Act.

                                       ii

                                    SUMMARY

    THE FOLLOWING SUMMARIZES INFORMATION IN OTHER SECTIONS OF THIS PROSPECTUS,
INCLUDING OUR FINANCIAL STATEMENTS, THE NOTES TO THOSE FINANCIAL STATEMENTS AND
THE OTHER FINANCIAL INFORMATION APPEARING ELSEWHERE IN THIS PROSPECTUS. YOU
SHOULD READ THIS ENTIRE PROSPECTUS CAREFULLY. THE TERM "OLD NOTES" AS USED IN
THIS PROSPECTUS REFERS TO OUR OUTSTANDING 10 3/8% SENIOR SUBORDINATED NOTES DUE
2011 THAT WE ISSUED ON APRIL 10, 2001 AND THAT HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT. THE TERM "EXCHANGE NOTES" REFERS TO THE 10 3/8% SENIOR
SUBORDINATED NOTES DUE 2011 OFFERED PURSUANT TO THIS PROSPECTUS. THE TERM
"NOTES" REFERS TO THE OLD NOTES AND THE EXCHANGE NOTES COLLECTIVELY.

                                  OUR BUSINESS

    We are a leading national provider of outsourced diagnostic imaging
services, with 91% of our 2000 revenues and 90% of our revenues for the first
quarter of 2001 derived from magnetic resonance imaging, or MRI. We provide
imaging and therapeutic services primarily to hospitals and other healthcare
providers on a mobile, shared-service basis. Our mobile, shared-service systems
are located in trailers which we move among our clients' locations. We also
provide systems that are located full-time at particular hospitals and clinics.
Our services normally include the use of our imaging or therapeutic systems,
technologists to operate the systems, equipment maintenance and upgrades and
management of day-to-day operations. We had 392 diagnostic imaging and
therapeutic systems, including 325 MRI systems, and 1,218 clients in 43 states
at March 31, 2001.

    Our typical contract is a three-to-five year arrangement with a hospital or
other healthcare provider, under which fees are payable to us regardless of
reimbursement by health insurers or other third-party payors. Our clients
contract with us to use our outsourced imaging services in order to:

    - avoid the capital investment and financial risk associated with the
      purchase of their own systems;

    - provide access to MRI and other services for their patients when the
      demand for these services does not justify the purchase of a system;

    - make use of our ancillary services which include marketing support,
      education and training and billing assistance; and

    - gain access to imaging services under our regulatory and licensing
      approvals when they do not have these approvals.

    Our MRI systems are among the most advanced in the industry. Our advanced
systems are able to perform high quality scans more rapidly and can be used for
a wider variety of imaging applications than less advanced systems. We are able
to upgrade most of our MRI systems through software and hardware enhancements,
which we believe reduces the potential for technological obsolescence.

                                  OUR INDUSTRY

    MRI services constituted $6.7 billion of the approximately $66 billion
diagnostic imaging industry in 1999. MRI's growth has been driven by its
recognition as a cost-effective, noninvasive diagnostic tool, increasing
physician acceptance and growth in the number of MRI applications. As a result,
we believe MRI will continue to capture a larger portion of the diagnostic
imaging market. The number of MRI scans grew at a compound annual rate of 10.5%
from 1990 to 2000 and is projected to grow at approximately this rate through
2006.

                                       1

                           OUR COMPETITIVE STRENGTHS

    We believe we benefit from the following competitive strengths:

    - our position as the largest national provider of outsourced MRI services;

    - exclusive, long-term contracts with limited customer concentration;

    - reduced reimbursement risk because we generate 90% of our revenues by
      billing hospitals and clinics rather than health insurers or other
      third-party payors;

    - our ability to provide comprehensive outsourcing solutions; and

    - our experienced executive management team.

                              OUR GROWTH STRATEGY

    We intend to capitalize upon these competitive strengths and grow our
business by:

    - increasing the number of scans we perform for our existing clients;

    - establishing new client relationships;

    - improving efficiency by increasing the number of scans we perform each day
      with our existing MRI systems;

    - offering new MRI applications;

    - offering new imaging services; and

    - pursuing selected strategic acquisitions.

    Despite the competitive strengths discussed above, we face a number of
challenges in growing our business. We currently have a substantial amount of
indebtedness, which places financial and other limitations on our business. Our
business is also subject to a number of other risks described in "Risk Factors."

                            ------------------------

    We are a Delaware corporation with our principal executive offices located
at 1065 PacifiCenter Drive, Suite 200, Anaheim, CA 92806. Our telephone number
at that location is (714) 688-7100.

                                       2

                         SUMMARY OF THE EXCHANGE OFFER


                                
The Exchange Offer.............  We are offering to exchange $1,000 principal amount of our
                                 exchange notes for each $1,000 principal amount of old notes. As
                                 of the date of this prospectus, $260 million in aggregate
                                 principal amount of old notes are outstanding.

                                 We have registered the exchange notes under the Securities Act
                                 and they are substantially identical to the old notes, except for
                                 the elimination of some transfer restrictions, registration
                                 rights and liquidated damages provisions relating to the old
                                 notes.

Accrued Interest on the
  Exchange Notes and the Old
  Notes........................  Interest on the exchange notes will accrue from the date of
                                 issuance of the old notes, which was on April 10, 2001. Holders
                                 whose old notes are accepted for exchange will be deemed to have
                                 waived the right to receive any interest accrued on the old
                                 notes.

No Minimum Condition...........  We are not conditioning the exchange offer on the tender of any
                                 minimum principal amount of old notes.

Expiration Date................  The exchange offer will expire at 5:00 p.m., New York City time,
                                 on July 30, 2001, unless we decide to extend the exchange offer.

Withdrawal Rights..............  You may withdraw your tender at any time prior to 5:00 p.m., New
                                 York City time, on the expiration date.

Conditions to the Exchange
  Offer........................  The exchange offer is subject to customary conditions, which we
                                 may waive. We currently anticipate that each of the conditions
                                 will be satisfied and that we will not need to waive any
                                 conditions. We reserve the right to terminate or amend the
                                 exchange offer at any time before the expiration date if any such
                                 condition occurs. For additional information, see "The Exchange
                                 Offer--Certain Conditions to the Exchange Offer."

Procedures for Tendering Old
  Notes........................  If you are a holder of old notes who wishes to accept the
                                 exchange offer, you must:

                                      complete, sign and date the accompanying letter of
                                      transmittal, or a facsimile of the letter of transmittal,
                                      and mail or otherwise deliver the letter of transmittal,
                                      together with your old notes, to the exchange agent at the
                                      address set forth under "The Exchange Offer--Exchange
                                      Agent;" or
                                 -

                                      arrange for The Depository Trust Company to transmit certain
                                      required information, including an agent's message forming
                                      part of a book-entry transfer in which you agree to be bound
                                      by the terms of the letter of transmittal, to the exchange
                                      agent in connection with a book-entry transfer.
                                 -

                                 By tendering your old notes in either manner, you will be
                                 representing among other things, that:

                                      the exchange notes you receive pursuant to the exchange
                                      offer are being acquired in the ordinary course of your
                                      business;
                                 -

                                      you are not participating, do not intend to participate, and
                                      have no arrangement or understanding with any person to
                                      participate, in the distribution of the exchange notes
                                      issued to you in the exchange offer; and
                                 -


                                       3



                                
                                      you are not an "affiliate" of ours.
                                 -

Special Procedures for
  Beneficial Owners............  If you beneficially own old notes registered in the name of a
                                 broker, dealer, commercial bank, trust company or other nominee
                                 and you wish to tender your old notes in the exchange offer, you
                                 should contact the registered holder promptly and instruct it to
                                 tender on your behalf. If you wish to tender on your own behalf,
                                 you must, prior to completing and executing the letter of
                                 transmittal and delivering your old notes, either arrange to have
                                 your old notes registered in your name or obtain a properly
                                 completed bond power from the registered holder. The transfer of
                                 registered ownership may take considerable time.

Guaranteed Delivery
  Procedures...................  If you wish to tender your old notes and time will not permit
                                 your required documents to reach the exchange agent by the
                                 expiration date, or the procedures for book-entry transfer cannot
                                 be completed on time, you may tender your old notes according to
                                 the guaranteed delivery procedures described in "The Exchange
                                 Offer--Procedures for Tendering Old Notes."

Acceptance of Old Notes and
  Delivery of Exchange Notes...  We will accept for exchange all old notes which are properly
                                 tendered in the exchange offer prior to 5:00 p.m., New York City
                                 time, on the expiration date. The exchange notes issued in the
                                 exchange offer will be delivered promptly following the
                                 expiration date. For additional information, see "The Exchange
                                 Offer--Acceptance of Old Notes for Exchange; Delivery of Exchange
                                 Notes."

Use of Proceeds................  We will not receive any proceeds from the issuance of exchange
                                 notes in the exchange offer. We will pay for our expenses
                                 incident to the exchange offer.

Federal Income Tax
  Consequences.................  The exchange of exchange notes for old notes in the exchange
                                 offer will not be a taxable event for federal income tax
                                 purposes. For additional information, see "Material United States
                                 Income Tax Considerations."

Effect on Holders of Old
  Notes........................  As a result of this exchange offer, we will have fulfilled a
                                 covenant contained in the registration rights agreement dated as
                                 of April 10, 2001 among us and each of the initial purchasers
                                 named in the agreement and, accordingly, there will be no
                                 increase in the interest rate on the old notes. If you do not
                                 tender your old notes in the exchange offer:

                                      you will continue to hold the old notes and will be entitled
                                      to all the rights and limitations applicable to the old
                                      notes under the indenture governing the notes, except for
                                      any rights under the registration rights agreement that
                                      terminate as a result of the completion of the exchange
                                      offer; and
                                 -

                                      you will not have any further registration or exchange
                                      rights and your old notes will continue to be subject to
                                      restrictions on transfer. Accordingly, the trading market
                                      for untendered old notes could be adversely affected.
                                 -

Exchange Agent.................  The Bank of New York is serving as exchange agent in connection
                                 with the exchange offer.


                                       4

                         SUMMARY OF THE EXCHANGE NOTES


                                
Securities Offered.............  Up to $260,000,000 principal amount of 10 3/8% senior
                                 subordinated notes due 2011 which have been registered under the
                                 Securities Act.

Maturity Date..................  April 15, 2011.

Interest Payment Dates.........  April 15 and October 15, commencing October 15, 2001.

                                 On or after April 15, 2006, the exchange notes will be
Optional Redemption............  redeemable, in whole or in part, at the redemption prices set
                                 forth under the heading "Description of the Exchange
                                 Notes--Optional Redemption," together with accrued and unpaid
                                 interest, if any, to the date of redemption. In addition, at any
                                 time on or prior to April 15, 2004, we may redeem up to 40% of
                                 the original aggregate principal amount of the exchange notes
                                 with the net proceeds of one or more equity offerings, at a
                                 redemption price equal to 110.375% of the aggregate principal
                                 amount to be redeemed, together with accrued and unpaid interest,
                                 if any, to the date of redemption; provided that at least 60% of
                                 the original aggregate principal amount of the exchange notes
                                 remains outstanding immediately after each redemption. See
                                 "Description of the Exchange Notes--Optional Redemption."

                                 Upon the occurrence of a change of control, we will have the
Change of Control..............  option, at any time prior to April 15, 2006, to redeem the
                                 exchange notes, in whole but not in part, at a redemption price
                                 equal to 100% of the aggregate principal amount of the exchange
                                 notes plus the applicable premium, together with accrued and
                                 unpaid interest, if any, to the date of redemption. Upon the
                                 occurrence of a change of control, if we do not elect to redeem
                                 the exchange notes, we will be required to make an offer to
                                 purchase the exchange notes at a price equal to 101% of the
                                 aggregate principal amount of the exchange notes, together with
                                 accrued and unpaid interest, if any, to the date of repurchase.
                                 See "Description of the Exchange Notes--Repurchase at the Option
                                 of Holders--Change of Control."

Ranking........................  The exchange notes will be:

                                 -    unsecured senior subordinated obligations;

                                 -    subordinated in right of payment to all existing and future
                                      senior debt, including our bank debt;

                                 -    effectively subordinated to all obligations of our
                                      subsidiaries;

                                 -    equal in rank with any future senior subordinated debt; and

                                 -    senior to any future junior subordinated debt.

                                 As of June 13, 2001, we had approximately $509 million of
                                 indebtedness senior to the notes. We have no material
                                 indebtedness of equivalent rank or junior to the notes. Of this
                                 amount, our subsidiaries had total liabilities of $14 million
                                 which are structurally senior to the exchange notes. See
                                 "Selected Consolidated Financial Data," "Risk Factors--Risks
                                 Related to Our Indebtedness," and "Description of the Exchange
                                 Notes--Subordination."


                                       5



                                
Certain Covenants..............  The indenture under which the notes will be issued contains
                                 covenants that will, subject to certain exceptions, limit, among
                                 other things, our and our restricted subsidiaries' ability to:

                                 -    pay dividends or make certain other restricted payments or
                                      investments;

                                 -    incur additional indebtedness and issue disqualified stock;

                                 -    create liens on assets;

                                 -    merge, consolidate, or sell all or substantially all of our
                                      and our restricted subsidiaries' assets;

                                 -    enter into certain transactions with affiliates;

                                 -    create restrictions on dividends or other payments by our
                                      restricted subsidiaries;

                                 -    create guarantees of indebtedness by restricted
                                      subsidiaries; and

                                 -    incur subordinated indebtedness that is senior to the notes.
                                      See "Description of the Exchange Notes--Certain Covenants."

Trustee........................  The Bank of New York.

Use of Proceeds................  We will not receive any cash proceeds from the exchange offer.


                                       6

                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION

    The following summary historical consolidated financial information with
respect to each year in the three-year period ended December 31, 2000 is derived
from our consolidated financial statements. The consolidated statement of
operations data for the three months ended March 31, 2000 and 2001 and the
consolidated balance sheet data as of March 31, 2000 and 2001 are derived from
our unaudited consolidated financial statements. The summary historical
consolidated financial information provided below should be read in conjunction
with the consolidated financial statements and notes thereto included elsewhere
in this prospectus.



                                                                                                     THREE MONTHS ENDED
                                                                  YEARS ENDED DECEMBER 31,                MARCH 31,
                                                              ---------------------------------   -------------------------
                                                                1998        1999        2000         2000          2001
                                                              ---------   ---------   ---------   -----------   -----------
                                                                                 (DOLLARS IN THOUSANDS)
                                                                                                 
CONSOLIDATED STATEMENTS OF OPERATIONS DATA:
Revenues....................................................  $ 243,297   $ 318,106   $ 345,287    $  84,322     $  91,257
Costs and expenses:
  Operating expenses, excluding depreciation................    111,875     143,238     151,722       36,647        39,853
  Depreciation expense......................................     33,493      47,055      54,924       12,721        15,406
  Selling, general and administrative expenses..............     24,446      31,097      38,338        9,240        11,068
  Amortization expense, primarily goodwill..................     11,289      14,565      14,390        3,598         3,607
  Termination and related costs.............................         --          --       4,573           --            --
  Recapitalization, merger integration, and regulatory
    costs...................................................      2,818      52,581       4,523          336            --
  Interest expense, net.....................................     41,772      51,958      77,051       18,933        18,849
                                                              ---------   ---------   ---------    ---------     ---------
  Total costs and expenses..................................    225,693     340,494     345,521       81,475        88,783
                                                              ---------   ---------   ---------    ---------     ---------
Income (loss) before income taxes and extraordinary loss....     17,604     (22,388)       (234)       2,847         2,474
Provision for income taxes..................................      8,736       3,297       1,969        1,423         1,237
                                                              ---------   ---------   ---------    ---------     ---------
Income (loss) before extraordinary loss.....................      8,868     (25,685)     (2,203)       1,424         1,237
Extraordinary loss, net of taxes............................     (2,271)    (17,766)         --           --            --
                                                              ---------   ---------   ---------    ---------     ---------
Net income (loss)...........................................  $   6,597   $ (43,451)  $  (2,203)   $   1,424     $   1,237
                                                              =========   =========   =========    =========     =========

OTHER DATA:
Adjusted EBITDA(1)..........................................  $ 107,076   $ 143,771   $ 155,560    $  38,435     $  40,465
Adjusted EBITDA margin(2)...................................       44.0%       45.2%       45.1%        45.6%         44.3%
Cash flows provided by (used in):
  Operating activities......................................     46,855      38,197      92,044       21,263         8,284
  Investing activities......................................   (245,104)   (104,072)    (90,995)     (25,897)      (18,836)
  Financing activities......................................    189,077      67,596       7,118        4,323         7,215
Capital expenditures........................................     72,321      95,914     101,554       34,010        21,152
Net debt to Adjusted EBITDA(1)(3)...........................        4.8x        5.2x        4.8x
Adjusted EBITDA to interest expense, net(1)(4)..............        2.6x        2.8x        2.0x         2.0x          2.1x
Ratio of earnings to fixed charges(5).......................        1.4x        0.6x        1.0x         1.1x          1.1x

CONSOLIDATED BALANCE SHEET DATA (AT END OF PERIOD):
Cash and cash equivalents...................................  $   3,083   $   4,804   $  12,971    $   4,493     $   9,634
Total assets................................................    567,932     625,510     646,160      637,556       654,785
Long-term debt, including current maturities................    518,423     751,849     758,989      756,172       774,124
Redeemable preferred stock..................................     16,673          --          --           --            --
Stockholders' deficit.......................................    (43,327)   (201,899)   (203,809)    (200,475)     (202,443)


------------------------------

(1) EBITDA represents earnings before interest expense, net, income taxes,
    depreciation and amortization expense. Adjusted EBITDA represents EBITDA
    adjusted for recapitalization costs, merger integration costs, regulatory
    costs, termination and related costs, stock-based compensation, and
    extraordinary items. EBITDA and adjusted EBITDA are not presentations made
    in accordance with generally accepted accounting principles. EBITDA and
    adjusted EBITDA should not be considered in isolation or as substitutes for
    net income, cash flows from operating activities and other income or cash
    flow statement data prepared in accordance with generally accepted
    accounting principles or as measures of profitability or liquidity. EBITDA
    and adjusted EBITDA are included in this offering memorandum to provide
    additional information with respect to our ability to satisfy our debt
    service, capital expenditure and working capital requirements and because
    certain covenants in our debt instruments are based on similar measures.
    While EBITDA and adjusted EBITDA are used as measures of operations and the
    ability to meet debt service requirements, they are not necessarily
    comparable to

                                       7

    other similarly titled captions of other companies due to differences in
    methods of calculations. The calculations of EBITDA and adjusted EBITDA are
    shown below:



                                                                                                  THREE MONTHS ENDED
                                                                 YEARS ENDED DECEMBER 31,              MARCH 31,
                                                              ------------------------------   -------------------------
                                                                1998       1999       2000        2000          2001
                                                              --------   --------   --------   -----------   -----------
                                                                                    (IN THOUSANDS)
                                                                                              
Net income (loss)...........................................  $  6,597   $(43,451)  $ (2,203)    $ 1,424       $ 1,237
  Depreciation expense......................................    33,493     47,055     54,924      12,721        15,406
  Amortization expense, primarily goodwill..................    11,289     14,565     14,390       3,598         3,607
  Interest expense, net.....................................    41,772     51,958     77,051      18,933        18,849
  Provision for income taxes................................     8,736      3,297      1,969       1,423         1,237
                                                              --------   --------   --------     -------       -------
EBITDA......................................................   101,887     73,424    146,131      38,099        40,336
  Termination and related costs(a)..........................        --         --      4,573          --            --
  Recapitalization, merger integration, and regulatory
    costs(b)................................................     2,818     52,581      4,523         336            --
  Stock based compensation(c)...............................       100         --        333          --           129
  Extraordinary loss, net of taxes..........................     2,271     17,766         --          --            --
                                                              --------   --------   --------     -------       -------
Adjusted EBITDA.............................................  $107,076   $143,771   $155,560     $38,435       $40,465
                                                              ========   ========   ========     =======       =======


    ----------------------------------

    (a) Termination and related costs for the year ended December 31, 2000
       represent $4,232 associated with termination costs and the cash-out of
       stock options for an executive officer who resigned due to health-related
       issues and $341 associated with the recruitment of his replacement.

    (b) Recapitalization, merger integration and regulatory costs for the year
       ended December 31, 2000, represent $704 of professional fees paid in
       connection with the KKR acquisition, $570 of compensatory costs related
       to stock option buy-backs and severance payments resulting from change in
       control provisions triggered by the KKR acquisition, $154 related to
       additional severance for employees of SMT, $123 of integration costs to
       migrate acquired entities to a common systems platform for direct patient
       billing, and $850 for assessments and $2,122 for costs and related
       professional fees to settle regulatory matters associated with the direct
       patient billing process of one of our acquired entities.
       Recapitalization, merger integration and regulatory costs for the year
       ended December 31, 1999, represent $19,640 in professional fees paid in
       connection with the KKR acquisition, $17,082 related to the purchase of
       outstanding stock options in connection with the KKR acquisition, $6,003
       in bonus payments paid in connection with the KKR acquisition, $1,088 in
       provisions to conform the accounting policies with respect to accounts
       receivable reserves, as well as employee vacation and sick pay reserves
       in connection with the SMT merger, $2,164 in employee severance costs in
       connection with the SMT merger, $3,075 in professional fees and other
       merger integration costs associated with the SMT merger and other
       acquired entities, and $3,529 for assessments to settle regulatory
       matters associated with the direct patient billing process of one of our
       acquired entities. Recapitalization, merger integration and regulatory
       costs for the year ended December 31, 1998, represents $1,846 in special
       non-recurring bonuses paid in connection with the MTI acquisition, $722
       of professional fees associated with accounting and billing systems
       conversions of acquired companies, and a $250 provision for doubtful
       accounts conforming accounting adjustment made in connection with the
       American Shared acquisition.

    (c) Stock-based compensation of $333 for the year ended December 31, 2000,
       represents $55 for options issued to certain employees at exercise prices
       below the fair value of our common stock, $68 for shares of Phantom stock
       issued to four non-employee directors below fair market value, and $210
       for common stock issued to one of our executive officers at below fair
       market value. Stock-based compensation of $100 for the year ended
       December 31, 1998, represents options issued to certain employees at
       exercise prices below the fair value of our common stock.

(2) Adjusted EBITDA margin is calculated by dividing adjusted EBITDA by
    revenues.

(3) For purposes of calculating net debt to adjusted EBITDA, net debt is defined
    as long-term debt, including current maturities, less cash and cash
    equivalents.

(4) For purposes of calculating adjusted EBITDA to interest expense, net,
    interest expense, net, is defined as interest expense net of interest
    income. Interest expense includes amortization of debt issuance costs.

(5) For the purpose of calculating the ratio of earnings to fixed charges,
    earnings are defined as income from continuing operations before income
    taxes and extraordinary items, plus minority interest expense, plus
    distributions from equity investees, plus fixed charges, less income from
    equity investments. Fixed charges are the sum of interest on all
    indebtedness, amortization of debt issuance costs, and estimated interest on
    rental expense. Earnings were inadequate to cover fixed charges by
    $21.4 million for the year ended December 31, 1999.

                                       8

                                  RISK FACTORS

    AN INVESTMENT IN OUR NOTES INVOLVES SIGNIFICANT RISKS. YOU SHOULD CAREFULLY
CONSIDER THE FOLLOWING RISKS DESCRIBED BELOW AND THE OTHER INFORMATION IN THIS
PROSPECTUS INCLUDING OUR FINANCIAL STATEMENTS AND RELATED NOTES BEFORE MAKING AN
INVESTMENT IN OUR NOTES.

                       RISKS RELATED TO OUR INDEBTEDNESS

OUR SUBSTANTIAL INDEBTEDNESS COULD RESTRICT OUR OPERATIONS AND MAKE US MORE
VULNERABLE TO ADVERSE ECONOMIC CONDITIONS.

    We are a highly leveraged company and our liabilities exceed our assets by a
substantial amount. As of June 13, 2001, we had $769.2 million of outstanding
debt, excluding letters of credit and guarantees, including $260.0 million of
the notes. Of our total debt, $491.0 million consisted of borrowings under our
credit facility, $260.0 million consisted of the notes, and $18.2 million
consisted of equipment debt and capitalized lease obligations. In addition, for
the quarter ended March 31, 2001, after giving pro forma effect to the offering
of the old notes, our ratio of earnings to fixed charges would have been 1.1x.

    Our substantial indebtedness could have important consequences for the
holders of the notes. For example, it could:

    - make it more difficult for us to satisfy our obligations with respect to
      the notes;

    - require us to dedicate a substantial portion of our cash flow from
      operations to payments on our indebtedness, thereby reducing the
      availability of our cash flow to fund working capital, capital
      expenditures and acquisitions and for other general corporate purposes;

    - increase our vulnerability to economic downturns and competitive pressures
      in our industry;

    - increase our vulnerability to interest rate fluctuations because a
      substantial amount of our debt is at variable interest rates; as of
      June 13, 2001, $491.0 million of our debt would have been at variable
      interest rates;

    - place us at a competitive disadvantage compared to our competitors that
      have less debt in relation to cash flow; and

    - limit our flexibility in planning for, or reacting to, changes in our
      business and our industry.

DESPITE CURRENT INDEBTEDNESS LEVELS, WE AND OUR SUBSIDIARIES MAY STILL BE ABLE
TO INCUR SUBSTANTIALLY MORE INDEBTEDNESS WHICH COULD INCREASE THE RISKS
DESCRIBED ABOVE.

    We and our subsidiaries may be able to incur substantial additional
indebtedness in the future. The terms of the indenture governing the notes will
permit us or our subsidiaries to incur additional indebtedness, subject to
certain restrictions. Further, the indenture allows for the incurrence of
indebtedness by our subsidiaries, all of which would be structurally senior to
the notes. In addition, as of June 13, 2001, our revolving credit facility
permitted additional borrowings of up to approximately $125 million subject to
the covenants contained in the credit facility, and all of those borrowings
would be senior to the notes. If new debt is added to our and our subsidiaries'
current debt levels, the risks discussed above could intensify.

WE MAY BE UNABLE TO GENERATE OR BORROW SUFFICIENT CASH TO MAKE PAYMENTS ON OUR
INDEBTEDNESS, INCLUDING THE NOTES, OR TO REFINANCE OUR INDEBTEDNESS, INCLUDING
THE NOTES, ON ACCEPTABLE TERMS.

    Our ability to make payments on our indebtedness will depend on our ability
to generate cash flow in the future which, to a certain extent, is subject to
general economic, financial, competitive, legislative, regulatory and other
factors that are beyond our control. In addition, future borrowings may not be
available to us under our credit facility in an amount sufficient to enable us
to pay our

                                       9

indebtedness, including the notes, or to fund our other cash needs. We may need
to refinance all or a portion of our indebtedness, including the notes, on or
before maturity. We may not be able to refinance any of our indebtedness,
including our credit facility and the notes, on commercially reasonable terms or
at all. Any refinancing of our debt could be at higher interest rates and may
require us to comply with more onerous covenants which could further restrict
our business operations.

WE MAY NOT BE ABLE TO FINANCE FUTURE NEEDS OR ADAPT OUR BUSINESS PLAN TO CHANGES
BECAUSE OF RESTRICTIONS PLACED ON US BY OUR CREDIT FACILITY, THE INDENTURE AND
INSTRUMENTS GOVERNING OUR OTHER INDEBTEDNESS.

    The indenture will, and our credit facility does, contain affirmative and
negative covenants which restrict, among other things, our ability to:

    - incur additional debt;

    - sell assets;

    - create liens or other encumbrances;

    - make certain payments and dividends; or

    - merge or consolidate.

    All of these restrictions could affect our ability to operate our business
and may limit our ability to take advantage of potential business opportunities
as they arise. A failure to comply with these covenants and restrictions would
permit the relevant creditors to declare all amounts borrowed under the relevant
facility, together with accrued interest and fees, to be immediately due and
payable. If the indebtedness under the credit facility or the notes is
accelerated, we may not have sufficient assets to repay amounts due under the
credit facility, the notes or on other indebtedness then outstanding. If we are
not able to refinance our debt, we could become subject to bankruptcy
proceedings, and you may lose all or a portion of your investment.

             RISKS RELATED TO GOVERNMENT REGULATION OF OUR BUSINESS

COMPLYING WITH FEDERAL AND STATE REGULATIONS IS AN EXPENSIVE AND TIME-CONSUMING
PROCESS, AND ANY FAILURE TO COMPLY COULD RESULT IN SUBSTANTIAL PENALTIES.

    We are directly or indirectly through our clients subject to extensive
regulation by both the federal government and the states in which we conduct our
business.

    If our operations are found to be in violation of any of the laws and
regulations to which we or our clients are subject, we may be subject to the
applicable penalty associated with the violation, including civil and criminal
penalties, damages, fines and the curtailment of our operations. Any penalties,
damages, fines or curtailment of our operations, individually or in the
aggregate, could adversely affect our ability to operate our business and our
financial results. The risk of our being found in violation of these laws and
regulations is increased by the fact that many of them have not been fully
interpreted by the regulatory authorities or the courts, and their provisions
are open to a variety of interpretations. Any action against us for violation of
these laws or regulations, even if we successfully defend against it, could
cause us to incur significant legal expenses and divert our management's
attention from the operation of our business. For a more detailed discussion of
the various state and federal regulations to which we are subject see
"Business--Regulation."

                                       10

AN UNEXPECTED ADVERSE OUTCOME FROM ANY OF OUR ONGOING ADMINISTRATIVE PROCEEDINGS
COULD RESULT IN DAMAGES, FINES OR THE CURTAILMENT OF OUR OPERATIONS.

    We currently have the following administrative proceedings pending:

    - a review by the National Heritage Insurance Company, our Medicare Part B
      contractor, of our Medicare billing claims in Massachusetts; and

    - an action by MassPRO stemming from an audit of Medicaid claims submitted
      by one of our wholly-owned subsidiaries.

    Each of the proceedings listed above is described in greater detail in
"Business--Legal and Administrative Proceedings." We have accrued $4,350,000 for
probable settlement of these proceedings. While actual results could vary from
this estimate, we believe that the resolution of any deficient billing process
will not have a material adverse effect on our business. If this assessment is
incorrect, however, then additional amounts required to settle these issues may
have an adverse effect on our financial condition and our operations.

HEALTHCARE REFORM LEGISLATION COULD LIMIT THE PRICES WE CAN CHARGE FOR OUR
SERVICES, WHICH WOULD REDUCE OUR REVENUES AND HARM OUR OPERATING RESULTS.

    In addition to extensive existing government healthcare regulation, there
are numerous initiatives at the federal and state levels for comprehensive
reforms affecting the payment for and availability of healthcare services,
including a number of proposals that would significantly limit reimbursement
under the Medicare and Medicaid Programs. Limitations on reimbursement amounts
and other cost containment pressures have in the past resulted in a decrease in
the revenue we receive for each scan we perform. It is not clear at this time
what proposals, if any, will be adopted or, if adopted, what effect these
proposals would have on our business. Aspects of certain of these healthcare
proposals, such as reductions in the Medicare and Medicaid Programs, containment
of healthcare costs on an interim basis by means that could include a short-term
freeze on prices charged by healthcare providers, and permitting greater state
flexibility in the administration of Medicaid, could limit the demand for our
services or affect the revenue per procedure that we can collect which would
harm our business and results of operations.

THE APPLICATION OR REPEAL OF STATE CERTIFICATE OF NEED REGULATIONS COULD HARM
OUR BUSINESS AND FINANCIAL RESULTS.

    Some states require a certificate of need or similar regulatory approval
prior to the acquisition of high-cost capital items including diagnostic imaging
systems or provision of diagnostic imaging services by us or our clients.
Seventeen of the 43 states in which we operate require a certificate of need and
more states may adopt similar licensure frameworks in the future. In many cases,
a limited number of these certificates are available in a given state. If we are
unable to obtain the applicable certificate or approval or additional
certificates or approvals necessary to expand our operations, these regulations
may limit or preclude our operations in the relevant jurisdictions.

    Conversely, states in which we have obtained a certificate of need may
repeal existing certificate of need regulations or liberalize exemptions from
the regulations. For example, Pennsylvania, Nebraska, New York, Ohio and
Tennessee have liberalized exemptions from certificate of need programs. The
repeal of certificate of need regulations in states in which we have obtained a
certificate of need or a certificate of need exemption would lower barriers to
entry for competition in those states and could adversely affect our business.

                                       11

IF WE FAIL TO COMPLY WITH VARIOUS LICENSURE, CERTIFICATION AND ACCREDITATION
STANDARDS WE MAY BE SUBJECT TO LOSS OF LICENSURE, CERTIFICATION OR ACCREDITATION
WHICH WOULD ADVERSELY AFFECT OUR OPERATIONS.

    All of the states in which we operate require that the imaging technologists
that operate our computed tomography, single photon emission computed
tomography, and positron emission tomography systems be licensed or certified.
Also, each of our retail sites must continue to meet various requirements in
order to receive payments from the Medicare Program. In addition, we are
currently accredited by the Joint Commission on Accreditation of Healthcare
Organizations, an independent, non-profit organization that accredits various
types of healthcare providers such as hospitals, nursing homes and providers of
diagnostic imaging services. In the healthcare industry, various types of
organizations are accredited to meet certain Medicare certification
requirements, expedite third-party payment, and fulfill state licensure
requirements. Some managed care providers prefer to contract with accredited
organizations. Any lapse in our licenses, certifications or accreditations, or
those of our technologists, or the failure of any of our retail sites to satisfy
the necessary requirements under Medicare could adversely affect our operations
and financial results.

                         RISKS RELATED TO OUR BUSINESS

CHANGES IN THE RATES OR METHODS OF THIRD-PARTY REIMBURSEMENTS FOR DIAGNOSTIC
IMAGING AND THERAPEUTIC SERVICES COULD RESULT IN REDUCED DEMAND FOR OUR SERVICES
OR CREATE DOWNWARD PRICING PRESSURE, WHICH WOULD RESULT IN A DECLINE IN OUR
REVENUES AND HARM TO OUR FINANCIAL POSITION.

    We derive a small portion of our revenues from direct billings to patients
and third-party payors such as Medicare, Medicaid or private health insurance
companies, and changes in the rates or methods of reimbursement for the services
we provide could have a negative impact on our revenues. Moreover, our
healthcare provider clients on whom we depend for the majority of our revenues
generally rely on reimbursement from third-party payors. In the past,
initiatives have been proposed which, if implemented, would have had the effect
of substantially decreasing reimbursement rates for diagnostic imaging services.
Similar initiatives enacted in the future may have an adverse impact on our
financial condition and our operations. Any change in the rates of or conditions
for reimbursement could substantially reduce the number of procedures for which
we or these healthcare providers can obtain reimbursement or the amounts
reimbursed to us or our clients for services provided by us. Because unfavorable
reimbursement policies have constricted and may continue to constrict the profit
margins of the hospitals and clinics we bill directly, we have and may continue
to need to lower our fees to retain existing clients and attract new ones. These
reductions could have a significant adverse effect on our revenues and financial
results by decreasing demand for our services or creating downward pricing
pressure.

    Recently promulgated federal regulations affect the ability of a Medicare
provider such as a hospital to include a service or facility as provider-based,
as opposed to treating the service as if it were offered offsite from the
hospital, for purposes of Medicare reimbursement. Historically, provider-based
status has allowed a provider to obtain more favorable Medicare reimbursement
for services like the ones we provide. While the Medicare, Medicaid and SCHIP
Benefits and Improvement Act of 2000 offers some relief for facilities
recognized as provider-based on October 1, 2000, under these new regulations,
some of our clients may have difficulty qualifying our services for
provider-based status. If a client cannot obtain provider-based status for our
services, then the provider might decide not to contract with us, which would
result in a decline in our operating results.

OUR REVENUES MAY FLUCTUATE OR BE UNPREDICTABLE AND THIS MAY HARM OUR FINANCIAL
RESULTS.

    The amount and timing of revenues that we may derive from our business will
fluctuate based on:

    - variations in the rate at which clients renew their contracts;

                                       12

    - the extent to which our mobile shared-service clients become full-time
      clients;

    - changes in the number of days of service we can offer with respect to a
      given diagnostic imaging or therapeutic system due to equipment
      malfunctions or the seasonal factors discussed below; and

    - the mix of wholesale and retail billing for our services.

    In addition, we experience seasonality in the sale of our services. For
example, our sales typically decline from our third fiscal quarter to our fourth
fiscal quarter. First and fourth quarter revenues are typically lower than those
from the second and third quarters. First quarter revenue is affected primarily
by fewer calendar days and inclement weather, the results of which are fewer
patient scans during the period. Fourth quarter revenue is affected primarily by
holiday and client and patient vacation schedules and inclement weather, the
results of which are fewer patient scans during the period. We may not be able
to reduce our expenses, including our debt service obligations, quickly enough
to respond to these declines in revenue, which would make our business difficult
to operate and would harm our financial results. In addition, we may be unable
to adjust our expenditures if revenues in a particular period fail to meet our
expectations, which would harm our operating results for that period and could
affect our ability to pay interest on the notes.

WE MAY EXPERIENCE COMPETITION FROM OTHER MEDICAL DIAGNOSTIC COMPANIES AND THIS
COMPETITION COULD ADVERSELY AFFECT OUR REVENUES AND OUR BUSINESS.

    The market for diagnostic imaging services and systems is competitive. Our
major competitors include Insight Health Services Corp., Medical
Resources, Inc., Shared Medical Services, Kings Medical Company Inc., Otter Tail
Power Company, U.S. Diagnostic Inc., and Syncor International Corporation. In
addition to direct competition from other mobile providers, we compete with
independent imaging centers and healthcare providers that have their own
diagnostic imaging systems as well as with equipment manufacturers that sell or
lease imaging systems to healthcare providers for full-time installation. Some
of our direct competitors which provide diagnostic imaging services may now or
in the future have access to greater financial resources than we do and may have
access to newer, more advanced equipment. In addition, some clients have in the
past elected to provide imaging services to their patients directly rather than
renewing their contacts with us. Finally, we face competition from providers of
competing technologies such as ultrasound and may face competition from
providers of new technologies in the future. If we are unable to successfully
compete, our client base would decline and our business and financial condition
would be harmed.

MANAGED CARE ORGANIZATIONS MAY PREVENT HEALTHCARE PROVIDERS FROM USING OUR
SERVICES WHICH WOULD CAUSE US TO LOSE CURRENT AND PROSPECTIVE CLIENTS.

    Healthcare providers participating as providers under managed care plans may
be required to refer diagnostic imaging tests to specific imaging service
providers depending on the plan in which each covered patient is enrolled. These
requirements currently inhibit healthcare providers from using our diagnostic
imaging services in some cases. The proliferation of managed care may prevent an
increasing number of healthcare providers from using our services in the future
which would cause our revenues to decline.

TECHNOLOGICAL CHANGE IN OUR INDUSTRY COULD REDUCE THE DEMAND FOR OUR SERVICES
AND REQUIRE US TO INCUR SIGNIFICANT COSTS TO UPGRADE OUR EQUIPMENT.

    Technological change in the MRI industry has been gradual since the last
major technological advancements were made in 1994. However, technological
changes in the MRI industry may accelerate in the future. The effect of
technological change could significantly impact our business. The development of
new scanning technology or new diagnostic applications for existing technology
may

                                       13

require us to adapt our existing technology or acquire new or technologically
improved systems in order to successfully compete. In the future, however, we
may not have the financial resources to do so, particularly given our
indebtedness. In addition, advancing technology may enable hospitals, physicians
or other diagnostic service providers to perform tests without the assistance of
diagnostic service providers such as ourselves. The development of new
technologies or refinements of existing ones might make our existing systems
technologically or economically obsolete, or cause a reduction in the value of,
or reduce the need for, our systems.

WE MAY BE UNABLE TO EFFECTIVELY MAINTAIN OUR IMAGING AND THERAPEUTIC SYSTEMS OR
GENERATE REVENUE WHEN OUR SYSTEMS ARE NOT WORKING.

    Timely, effective service is essential to maintaining our reputation and
high utilization rates on our imaging systems. Repairs to one of our systems can
take up to two weeks and result in a loss of revenue. Our warranties and
maintenance contracts do not fully compensate us for loss of revenue when our
systems are not working. The principal components of our operating costs include
depreciation, salaries paid to technologists and drivers, annual system
maintenance costs, insurance and transportation costs. Because the majority of
these expenses is fixed, a reduction in the number of scans performed due to
out-of-service equipment will result in lower revenues and margins. Repairs of
our equipment are performed for us by the equipment manufacturers. These
manufacturers may not be able to perform repairs or supply needed parts in a
timely manner. Thus, if we experience greater than anticipated system
malfunctions or if we are unable to promptly obtain the service necessary to
keep our systems functioning effectively, our revenues could decline and our
ability to provide services would be harmed.

WE MAY BE UNABLE TO RENEW OR MAINTAIN OUR CLIENT CONTRACTS WHICH WOULD HARM OUR
BUSINESS AND FINANCIAL RESULTS.

    Upon expiration of our clients' contracts, we are subject to the risk that
clients will cease using our imaging services and purchase or lease their own
imaging systems or use our competitors' imaging systems. Thirty-three percent of
our MRI contracts will expire in 2001 and an additional twenty-four percent will
expire in 2002. If these contracts are not renewed, it could result in a
significant negative impact on our business. In particular, renewal rates for
contracts inherited from our acquired companies have historically been lower
than those for our own contracts. For example, in 2000, the retention rate on
contracts originated by us was approximately 87% compared with an average
retention rate of approximately 83% for contracts originated by companies we
acquired in the last three years. It is not always possible to immediately
obtain replacement clients, and historically many replacement clients have been
smaller facilities which have a lower number of scans than lost clients.

WE MAY BE SUBJECT TO PROFESSIONAL LIABILITY RISKS WHICH COULD BE COSTLY AND
NEGATIVELY IMPACT OUR BUSINESS AND FINANCIAL RESULTS.

    We may be subject to professional liability claims. Although there currently
are no known hazards associated with MRI or our other scanning technologies when
used properly, hazards may be discovered in the future. Furthermore, there is a
risk of harm to a patient during an MRI if the patient has certain types of
metal implants or cardiac pacemakers within his or her body. Patients are
carefully screened to safeguard against this risk, but screening may
nevertheless fail to identify the hazard. To protect against possible
professional liability, we maintain professional liability insurance. However,
if we are unable to maintain insurance in the future at an acceptable cost or at
all or if our insurance does not fully cover us, and a successful claim was made
against us, we could be exposed. Any claim made against us not fully covered by
insurance could be costly to defend against, result in a substantial damage
award against us and divert the attention of our management from our operations,
which could have an adverse effect on our financial performance.

                                       14

LOSS OF KEY EXECUTIVES AND FAILURE TO ATTRACT QUALIFIED MANAGERS, TECHNOLOGISTS
AND SALES PERSONS COULD LIMIT OUR GROWTH AND NEGATIVELY IMPACT OUR OPERATIONS.

    We depend upon our management team to a substantial extent. In 2000, we
added 216 employees. As we grow, we will increasingly require field managers and
sales persons with experience in our industry and skilled technologists to
operate our diagnostic equipment. It is impossible to predict the availability
of qualified field managers, sales persons and technologists or the compensation
levels that will be required to hire them. In particular, there is a very high
demand for qualified technologists who are necessary to operate our systems. We
may not be able to hire and retain a sufficient number of technologists, and we
may be required to pay bonuses and higher salaries to our technologists, which
would increase our expenses. The loss of the services of any member of our
senior management or our inability to hire qualified field managers, sales
persons and skilled technologists at economically reasonable compensation levels
could adversely affect our ability to operate and grow our business.

    In addition, our inability to retain employees who have received options
under our 1999 Equity Plan could have a material adverse effect on our net
income in a future period. On June 20, 2001, our compensation committee
authorized us to enter into the amended option agreements to reduce the
performance targets that trigger the acceleration of the vesting of
performance-based options granted under the plan. As discussed in "Management's
Discussion and Analysis of Financial Condition and Results of Operations," if we
achieve the new reduced performance vesting targets specified in the amended
option agreements but do not achieve the original performance vesting targets,
and an option holder terminates employment prior to the eighth anniversary of
the option grant date, we would be required to record a non-cash compensation
charge equal to the amount by which the actual value of the shares subject to
the performance vesting option on the date of the amendment exceeded the
option's exercise price. We note that the executive officers listed in
"Management--Executive Officers and Directors" in the aggregate hold
approximately 81% of the outstanding options under the 1999 Equity Plan. If a
substantial number of senior managers were to leave in future periods under
these circumstances, the non-cash compensation charges that we would be required
to record would have a material adverse effect on our net income in those
periods.

OUR POSITRON EMISSION TOMOGRAPHY, OR PET, SERVICE AND SOME OF OUR OTHER IMAGING
SERVICES REQUIRE THE USE OF RADIOACTIVE MATERIALS, WHICH COULD SUBJECT US TO
REGULATION, RELATED COSTS AND DELAYS AND POTENTIAL LIABILITIES FOR INJURIES OR
VIOLATIONS OF ENVIRONMENTAL, HEALTH AND SAFETY LAWS.

    Our PET service and some of our other imaging and therapeutic services
require radioactive materials. While this radioactive material has a short
half-life, meaning it quickly breaks down into inert, or non-radioactive
substances, storage, use and disposal of these materials presents the risk of
accidental environmental contamination and physical injury. We are subject to
federal, state and local regulations governing storage, handling and disposal of
these materials and waste products. Although we believe that our safety
procedures for storing, handling and disposing of these hazardous materials
comply with the standards prescribed by law and regulation, we cannot completely
eliminate the risk of accidental contamination or injury from those hazardous
materials. In the event of an accident, we could be held liable for any damages
that result, and any liability could exceed the limits or fall outside the
coverage of our insurance. We may not be able to maintain insurance on
acceptable terms, or at all. We could incur significant costs and the diversion
of our management's attention in order to comply with current or future
environmental, health and safety laws and regulations.

WE MAY NOT BE ABLE TO ACHIEVE THE EXPECTED BENEFITS FROM ANY PAST OR FUTURE
ACQUISITIONS WHICH WOULD ADVERSELY AFFECT OUR FINANCIAL CONDITION AND RESULTS.

    We have historically relied on acquisitions as a method of expanding our
business. In the past five years we have, directly or indirectly though our
subsidiaries, completed seven significant acquisitions. In addition, although we
have not presently identified any potential future acquisition candidates, we
will

                                       15

consider future acquisitions as opportunities arise. If we do not successfully
integrate acquisitions, we may not realize anticipated operating advantages and
cost savings. The integration of companies that have previously operated
separately involves a number of risks, including:

    - demands on management related to the increase in our size after an
      acquisition;

    - the diversion of our management's attention from the management of daily
      operations to the integration of operations;

    - difficulties in the assimilation and retention of employees;

    - potential adverse effects on operating results; and

    - challenges in retaining clients.

    With regard to the last item noted above, our client contract renewal rates
for contracts inherited from our acquired companies have historically been lower
than those for our own contracts. We may not be able to maintain the levels of
operating efficiency acquired companies will have achieved or might achieve
separately. Successful integration of each of their operations will depend upon
our ability to manage those operations and to eliminate redundant and excess
costs. Because of difficulties in combining operations, we may not be able to
achieve the cost savings and other size related benefits that we hoped to
achieve after these acquisitions which would harm our financial condition and
results.

                           RISKS RELATED TO THE NOTES

HOLDERS OF SENIOR INDEBTEDNESS WILL BE PAID BEFORE HOLDERS OF THE NOTES ARE
PAID.

    The notes rank junior behind all of our existing indebtedness and all of our
future indebtedness unless that indebtedness expressly provides that it ranks
equal with, or is subordinate in right of payment to, the notes. As a result,
upon any distribution to our creditors in a bankruptcy, liquidation or
reorganization or similar proceeding relating to us or our property, the holders
of our senior debt will be entitled to be paid in full in cash before any
payment may be made with respect to these notes. In addition, all payments on
the notes will be blocked in the event of a payment default on senior debt and
may be blocked for up to 179 of 365 consecutive days in the event of certain
non-payment defaults on senior debt.

    In the event of a bankruptcy, liquidation or reorganization or similar
proceeding relating to us, holders of the notes and all other holders of our
subordinated indebtedness will participate in the assets remaining after we have
paid all of our senior debt. However, because the indenture requires that
amounts otherwise payable to holders of the notes in a bankruptcy or similar
proceeding be paid to holders of senior debt first, holders of the notes may
receive less, ratably, than holders of senior debt in any bankruptcy proceeding.
In any of these cases, we may not have sufficient funds to pay all of our
creditors. If no assets remain after payment to holders of senior debt, you will
lose all of your investment in the notes.

    Assuming we had completed the offering of the old notes on March 31, 2001,
the notes would have been subordinated to $523 million of senior debt, our debt
and other liabilities would have exceeded our assets by $205 million, and
approximately $113 million would have been available for borrowing as additional
senior debt under our revolving credit facility. We will be permitted to borrow
substantial additional indebtedness, including senior debt, in the future under
the terms of the credit facility and the indenture governing the notes.

WE HAVE RESTRICTED ACCESS TO THE CASH FLOWS AND ASSETS OF OUR SUBSIDIARIES WHICH
MAY PREVENT US FROM MAKING PRINCIPAL AND INTEREST PAYMENTS ON THE NOTES.

    Although a substantial portion of our business is conducted through our
subsidiaries, none of our subsidiaries will have any obligation, contingent or
otherwise, to make any funds available to us for

                                       16

payment of the principal of, and the interest on, the notes. Accordingly, our
ability to pay the principal of, and the interest on, the notes is dependent
upon the earnings of our subsidiaries and the distribution of funds from our
subsidiaries. Furthermore, our subsidiaries will be permitted under the terms of
the indenture to incur certain additional indebtedness that may severely
restrict or prohibit the making of distributions, the payment of dividends or
the making of loans by these subsidiaries to us.

    There can be no assurance that our operations, independent of our
subsidiaries, will generate sufficient cash flow to support payment of principal
of, and interest on, the notes, or that dividends, distributions or loans will
be available from our subsidiaries to fund these payments.

THE NOTES WILL BE STRUCTURALLY SUBORDINATED TO THE DEBT OF OUR SUBSIDIARIES.

    None of our subsidiaries has guaranteed our obligations to make payments on
the notes. In the event of a bankruptcy, liquidation or reorganization of any of
our subsidiaries, their creditors will generally be entitled to payment of their
claims from their assets before any assets are made available for a distribution
to us for any purpose, including payments on the notes. As a result, the notes
will be structurally subordinated to the debt of our subsidiaries, which totaled
$16 million outstanding as of March 31, 2001. Also in the event of a bankruptcy,
liquidation or reorganization of any of our subsidiaries, we and our creditors,
including the holders of the notes, will have no right to proceed against the
assets of our subsidiaries or to cause the liquidation or bankruptcy of these
subsidiaries under bankruptcy laws.

WE MAY NOT BE ABLE TO REPURCHASE NOTES UPON A CHANGE OF CONTROL, WHICH WOULD BE
AN EVENT OF DEFAULT UNDER THE INDENTURE.

    Upon the occurrence of specific kinds of change of control events, we will
be required to offer to repurchase all of the outstanding notes. The terms of
the notes may not protect you if we undergo a highly leveraged transaction,
reorganization, restructuring, merger or similar transaction that may adversely
affect you unless the transaction is included in the definition of a change of
control. Our credit facility restricts us from repurchasing the notes without
the approval of the lenders. In addition, it is possible that we will not have
sufficient funds at the time of the change of control to make the required
repurchase of notes or that other restrictions in our credit facility and the
notes will not allow these repurchases. This could constitute an event of
default under the credit facility, entitling the lenders to, among other things,
cause all indebtedness under the credit facility to become due and payable, and
proceed against their collateral. Our failure to repurchase the notes would
constitute an event of default under the indenture which would in turn result in
an event of default under our credit agreement, in which case the lenders under
our credit facility could cause all indebtedness under the credit facility to
become due and payable.

FEDERAL BANKRUPTCY LAWS AND STATE FRAUDULENT TRANSFER LAWS COULD ALLOW A FEDERAL
OR STATE COURT TO LIMIT PAYMENTS TO HOLDERS OF THE NOTES OR FURTHER SUBORDINATE
OUR OBLIGATIONS TO HOLDERS OF THE NOTES.

    Under applicable provisions of the United States Bankruptcy Code or
comparable provisions of state fraudulent transfer or conveyance law, a federal
or state court could significantly limit our obligations to the holders of the
notes if the court determines we did either of the following when we issued the
notes:

    - incurred the indebtedness associated with the notes to hinder, delay or
      defraud our creditors; or

    - received less than a reasonably equivalent value or fair consideration for
      the notes and any of the following applied:

       - we were insolvent at the time of incurring the indebtedness associated
         with the notes,

       - we were rendered insolvent by the incurrence of the notes indebtedness,

                                       17

       - we were engaged in a business or transaction in which our remaining
         assets constituted unreasonably small capital to carry on our business,
         or

       - we intended to incur debts beyond our ability to pay our debts as they
         matured.

    If the court determined that the circumstances discussed above were present,
then the court could void, in whole or in part, our obligations to the holders
of the notes or subordinate our obligations to these holders to other of our
existing or future indebtedness.

WE ARE CONTROLLED BY A SINGLE STOCKHOLDER WHICH WILL BE ABLE TO EXERT
SIGNIFICANT INFLUENCE OVER MATTERS REQUIRING STOCKHOLDER APPROVAL, INCLUDING
CHANGE OF CONTROL TRANSACTIONS.

    An affiliate of Kohlberg Kravis Roberts & Co., L.P., or KKR, owns
approximately 92% of our common equity. Accordingly, the KKR affiliate controls
us and has the power to elect all of our directors, appoint new management and
approve any action requiring the approval of the holders of shares of our common
stock, including adopting amendments to our certificate of incorporation and
approving mergers, consolidations or sales of all or substantially all of our
assets. This concentration of ownership will allow KKR to approve a change of
control transaction, which would require us to repurchase all of the notes. The
interests of KKR may conflict with the interests of the holders of the notes.

AN ACTIVE TRADING MARKET MAY NOT DEVELOP FOR THE EXCHANGE NOTES.

    We are offering the exchange notes to the holders of the old notes. The old
notes were sold in April 2001 to a small number of institutional investors and
are eligible for trading in the Private Offerings, Resale and Trading through
Automatic Linkages (PORTAL) Market. To the extent that old notes are tendered
and accepted in the exchange offer, the trading market for untendered and
tendered but unaccepted old notes will be adversely affected. We cannot assure
you that this market will provide liquidity for you if you want to sell your old
notes.

    We do not intend to apply for a listing of the exchange notes on a
securities exchange or on any automated dealer quotation system. The exchange
notes are new securities for which there is currently no market. We cannot
assure you as to the liquidity of markets that may develop for the exchange
notes, your ability to sell the exchange notes or the price at which you would
be able to sell the exchange notes. If such markets were to exist, the exchange
notes could trade at prices that may be lower than their principal amount or
purchase price depending on many factors, including prevailing interest rates
and the markets for similar securities. The initial purchasers of the old notes
have advised us that they currently intend to make a market with respect to the
exchange notes. However, they are not obligated to do so, and any market making
activities may be discontinued at any time without notice. In addition, such
market making activity may be limited during the pendency of the exchange offer.

    The liquidity of, and trading market for, the exchange notes also may be
adversely affected by changes in the market for high yield securities and by
changes in our financial performance or prospects or in the prospects for
companies in our industry generally.

    As a result, you cannot be sure that an active trading market will develop
for the exchange notes.

                                       18

                           FORWARD LOOKING STATEMENTS

    We have made statements under the captions "Summary," "Risk Factors," "Use
of Proceeds," "Management's Discussion and Analysis of Financial Condition and
Results of Operations," "Business" and elsewhere in this prospectus that are
forward looking statements. In some cases you can identify these statements by
forward looking words such as "may", "will", "should", "expect", "plans",
"anticipate", "believe", "estimate", "predict", "seek", "intend" and "continue"
or similar words. Forward looking statements may also use different phrases.
Forward looking statements address, among other things our future expectations,
projections of our future results of operations or of our financial condition
and other forward looking information.

    We believe it is important to communicate our expectations to our investors.
However, there may be events in the future that we are not able to accurately
predict or which we do not fully control that could cause actual results to
differ materially from those expressed or implied by our forward looking
statements, including:

    - our high degree of leverage and our ability to service our debt;

    - factors affecting our leverage, including, interest rates;

    - our ability to incur more indebtedness;

    - the effect of operating and financial restrictions in our debt agreements;

    - our estimates regarding our capital requirements;

    - intense levels of competition in the diagnostic imaging services and
      imaging systems industry;

    - changes in healthcare regulation, including changes in Medicare and
      Medicaid reimbursement policies, adverse to our services;

    - our ability to keep pace with technological developments within our
      industry;

    - the growth in the market for MRI and other services;

    - our ability to successfully integrate any future acquisitions; and

    - other factors discussed under "Risk Factors."

    This prospectus contains statistical data that we obtained from public
industry publications. These publications generally indicate that they have
obtained their information from sources believed to be reliable, but do not
guarantee the accuracy and completeness of their information. Although we
believe that the publications are reliable, we have not independently verified
their data.

                                       19

                       RATIO OF EARNINGS TO FIXED CHARGES

    The following table sets forth our ratio of earnings to fixed charges:



                                                                                                      THREE MONTHS ENDED
                                                             YEARS ENDED DECEMBER 31,                     MARCH 31,
                                               ----------------------------------------------------   ------------------
                                                 1996       1997       1998       1999       2000            2001
                                               --------   --------   --------   --------   --------          ----
                                                                                    
Ratio of earnings to fixed charges...........    2.0x       0.6x       1.4x       0.6x       1.0x            1.1x


    Earnings were inadequate to cover fixed charges by $4.2 million and
$21.4 million for the years ended December 31, 1997 and 1999, respectively.

    For the purpose of computing the ratio of earnings to fixed charges,
earnings are defined as:

    - income from continuing operations before income taxes and extraordinary
      items;

    - plus minority interest expense;

    - plus distributions from equity investees;

    - plus fixed charges;

    - less income from equity investments.

    Fixed charges are defined as the sum of the following:

    - interest on all indebtedness;

    - amortization of debt issuance costs; and

    - estimated interest on rental expense.

                                USE OF PROCEEDS

    We will not receive any proceeds from the exchange of the exchange notes for
the old notes pursuant to the exchange offer.

    The aggregate proceeds from the offering of the old notes were used to repay
our senior subordinated credit facility, under which we had $260 million of
indebtedness outstanding, which otherwise would have matured on November 2, 2009
and which bore interest at a rate of 10.377% per annum at repayment. We borrowed
against our credit facility to pay initial purchaser discounts, commissions and
estimated expenses of the old notes.

                                       20

                                 CAPITALIZATION

    You should read this table together with "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and our financial
statements and the related notes included elsewhere in this prospectus. The
following table describes our capitalization as of March 31, 2001:

    - on an actual basis; and

    - on an as adjusted basis to give effect to the offering of the old notes
      and the borrowings under our credit facility made to pay the initial
      purchasers' discounts and commissions and offering expenses incurred in
      connection with the offering of the old notes.



                                                                       MARCH 31, 2001,
                                                              ---------------------------------
                                                                                AS ADJUSTED
                                                                             FOR THE OFFERING
                                                                ACTUAL       OF THE OLD NOTES
                                                              -----------   -------------------
                                                              (IN THOUSANDS, EXCEPT SHARE DATA)
                                                                      
Cash and cash equivalents...................................   $   9,634     $           9,634
                                                               =========     =================
Long-term debt, including current portion:
  Term loan facility under our credit agreement.............   $ 466,000     $         466,000
  Senior subordinated credit facility.......................     260,000                    --
  Revolving loan facility under our credit agreement........      28,000                37,000
  Equipment loans...........................................      20,124                20,124
  10 3/8% senior subordinated notes due 2011................          --               260,000
                                                               ---------     -----------------
    Total long-term debt....................................     774,124               783,124
                                                               ---------     -----------------
Stockholders' deficit:
  Common stock, $0.01 par value: 10,000,000 shares
    authorized, 3,806,836 shares issued and outstanding,
    actual and as adjusted..................................          38                    38
  Additional paid-in deficit................................    (137,103)             (137,103)
  Note receivable from officer..............................        (300)                 (300)
  Accumulated deficit.......................................     (65,078)              (67,318)
                                                               ---------     -----------------
Total stockholders' deficit.................................    (202,443)             (204,683)
                                                               ---------     -----------------
    Total capitalization....................................   $ 571,681     $         578,441
                                                               =========     =================


                                       21

                      SELECTED CONSOLIDATED FINANCIAL DATA

    The selected financial data shown below for, and as of the end of, each of
the years in the five-year period ended December 31, 2000 and for the three
months ended March 31, 2000 and 2001 have been derived from our financial
statements. The income statement data for the years ended December 31, 1998,
1999 and 2000 and the balance sheet data at December 31, 1999 and 2000 have been
derived from financial statements, which have been audited and which are
included in this prospectus. The income statement data for the years ended
December 31, 1996 and 1997 and the balance sheet data at December 31, 1996, 1997
and 1998 have been derived from our audited financial statements, which are not
included in this prospectus. The income statement data for the three months
ended March 31, 2000 and 2001 and the balance sheet data at March 31, 2001 have
been derived from our unaudited financial statements which are included in this
prospectus. The balance sheet data at March 31, 2000 has been derived from our
unaudited financial statements which are not included in this prospectus. The
summary financial data should be read in conjunction with "Risk Factors,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and our consolidated financial statements and related notes included
elsewhere in this prospectus.



                                                                                                            THREE MONTHS
                                                             YEARS ENDED DECEMBER 31,                      ENDED MARCH 31,
                                              -------------------------------------------------------   ---------------------
                                                1996       1997       1998        1999        2000        2000        2001
                                              --------   --------   ---------   ---------   ---------   ---------   ---------
                                                                          (DOLLARS IN THOUSANDS)
                                                                                               
CONSOLIDATED STATEMENTS OF OPERATIONS DATA:
Revenues....................................  $ 68,482   $ 86,474   $ 243,297   $ 318,106   $ 345,287   $  84,322   $  91,257
Costs and expenses:
  Operating expenses, excluding
    depreciation............................    32,344     38,997     111,875     143,238     151,722      36,647      39,853
  Depreciation expense......................    12,737     15,993      33,493      47,055      54,924      12,721      15,406
  Selling, general and administrative
    expenses................................     8,130      8,857      24,446      31,097      38,338       9,240      11,068
  Amortization expense, primarily
    goodwill................................     1,952      2,426      11,289      14,565      14,390       3,598       3,607
  Termination and related costs.............        --         --          --          --       4,573          --          --
  Recapitalization, merger integration, and
    regulatory costs........................        --     16,350       2,818      52,581       4,523         336          --
  Interest expense, net.....................     5,758      7,808      41,772      51,958      77,051      18,933      18,849
                                              --------   --------   ---------   ---------   ---------   ---------   ---------
  Total costs and expenses..................    60,921     90,431     225,693     340,494     345,521      81,475      88,783
                                              --------   --------   ---------   ---------   ---------   ---------   ---------
Income (loss) before income taxes and
  extraordinary gain (loss).................     7,561     (3,957)     17,604     (22,388)       (234)      2,847       2,474
Provision for income taxes..................     1,060      1,700       8,736       3,297       1,969       1,423       1,237
                                              --------   --------   ---------   ---------   ---------   ---------   ---------
Income (loss) before extraordinary gain
  (loss)....................................     6,501     (5,657)      8,868     (25,685)     (2,203)      1,424       1,237
Extraordinary gain (loss), net of taxes.....     6,300      1,849      (2,271)    (17,766)         --          --          --
                                              --------   --------   ---------   ---------   ---------   ---------   ---------
Net income (loss)...........................  $ 12,801   $ (3,808)  $   6,597   $ (43,451)  $  (2,203)  $   1,424   $   1,237
                                              ========   ========   =========   =========   =========   =========   =========
CONSOLIDATED BALANCE SHEET DATA (AT END OF
  PERIOD):
Cash and cash equivalents...................  $ 10,867   $ 12,255   $   3,083   $   4,804   $  12,971   $   4,493   $   9,634
Total assets................................   128,510    284,815     567,932     625,510     646,160     637,556     654,785
Long-term debt, including current
  maturities................................    89,025    290,270     518,423     751,849     758,989     756,172     774,124
Redeemable preferred stock..................     4,694     14,487      16,673          --          --          --          --
Stockholders' equity (deficit)..............    16,360    (47,904)    (43,327)   (201,899)   (203,809)   (200,475)   (202,443)
OTHER DATA:
Adjusted EBITDA(1)..........................  $ 28,008   $ 38,620   $ 107,076   $ 143,771   $ 155,560   $  38,435   $  40,465
Adjusted EBITDA margin(2)...................      40.9%      44.7%       44.0%       45.2%       45.1%       45.6%       44.3%
Cash flows provided by (used in):
  Operating activities......................    21,731     12,864      46,855      38,197      92,044      21,263       8,284
  Investing activities......................   (27,936)   (56,963)   (245,104)   (104,072)    (90,995)    (25,897)    (18,836)
  Financing activities......................     5,944     45,487     189,077      67,596       7,118       4,323       7,215
Capital expenditures........................    26,510     45,122      72,321      95,914     101,554      34,010      21,152
Net debt to adjusted EBITDA(1)(3)...........       2.8x       7.2x        4.8x        5.2x        4.8x
Adjusted EBITDA to interest expense,
  net(1)(4)                                        4.9x       4.9x        2.6x        2.8x        2.0x        2.0x        2.1x
Ratio of earnings to fixed charges(5).......       2.0x       0.6x        1.4x        0.6x        1.0x        1.1x        1.1x


------------------------------

(1) EBITDA represents earnings before interest expense, net, income taxes,
    depreciation and amortization expense. Adjusted EBITDA represents EBITDA
    adjusted for recapitalization costs, merger integration costs, regulatory
    costs, termination and related costs, stock-based compensation, and
    extraordinary items. EBITDA and adjusted EBITDA are not presentations made
    in accordance with generally accepted accounting principles. EBITDA and
    adjusted EBITDA should not be considered in isolation or as substitutes for
    net income, cash flows from operating activities and other income or cash
    flow statement data prepared in accordance with generally accepted
    accounting principles or as measures of profitability or liquidity. EBITDA
    and adjusted EBITDA are included in this prospectus to provide additional
    information with respect to our ability

                                       22

    to satisfy our debt service, capital expenditure and working capital
    requirements and because certain covenants in our debt instruments are based
    on similar measures. While EBITDA and adjusted EBITDA are used as measures
    of operations and the ability to meet debt service requirements, they are
    not necessarily comparable to other similarly titled captions of other
    companies due to differences in methods of calculations. The calculations of
    EBITDA and adjusted EBITDA are shown below:



                                                                                                         THREE MONTHS
                                                             YEARS ENDED DECEMBER 31,                   ENDED MARCH 31,
                                               ----------------------------------------------------   -------------------
                                                 1996       1997       1998       1999       2000       2000       2001
                                               --------   --------   --------   --------   --------   --------   --------
                                                                             (IN THOUSANDS)
                                                                                            
    Net income (loss)........................  $12,801    $(3,808)   $  6,597   $(43,451)  $ (2,203)  $ 1,424    $ 1,237
      Depreciation expense...................   12,737     15,993      33,493     47,055     54,924    12,721     15,406
      Amortization expense, primarily
        goodwill.............................    1,952      2,426      11,289     14,565     14,390     3,598      3,607
      Interest expense, net..................    5,758      7,808      41,772     51,958     77,051    18,933     18,849
      Provision for income taxes.............    1,060      1,700       8,736      3,297      1,969     1,423      1,237
                                               -------    -------    --------   --------   --------   -------    -------
    EBITDA...................................   34,308     24,119     101,887     73,424    146,131    38,099     40,336
      Termination and related costs(a).......       --         --          --         --      4,573        --         --
      Recapitalization, merger integration,
        and regulatory costs(b)..............       --     16,350       2,818     52,581      4,523       336         --
      Stock based compensation(c)............       --         --         100         --        333        --        129
      Extraordinary (gain) loss net of
        taxes................................   (6,300)    (1,849)      2,271     17,766         --        --         --
                                               -------    -------    --------   --------   --------   -------    -------
    Adjusted EBITDA..........................  $28,008    $38,620    $107,076   $143,771   $155,560   $38,435    $40,465
                                               =======    =======    ========   ========   ========   =======    =======


    ----------------------------------

    (a) Termination and related costs for the year ended December 31, 2000
       represent $4,232 associated with termination costs and the cash-out of
       stock options for an executive officer who resigned due to health-related
       issues and $341 associated with the recruitment of his replacement.

    (b) Recapitalization, merger integration and regulatory costs for the year
       ended December 31, 2000, represent $704 of professional fees paid in
       connection with the KKR acquisition, $570 of compensatory costs related
       to stock option buy-backs and severance payments resulting from change in
       control provisions triggered by the KKR acquisition, $154 related to
       additional severance for employees of SMT, $123 of integration costs to
       migrate acquired entities to a common systems platform for direct patient
       billing, and $850 for assessments and $2,122 for costs and related
       professional fees to settle regulatory matters associated with the direct
       patient billing process of one of our acquired entities.
       Recapitalization, merger integration and regulatory costs for the year
       ended December 31, 1999, represent $19,640 in professional fees paid in
       connection with the KKR acquisition, $17,082 related to the purchase of
       outstanding stock options in connection with the KKR acquisition, $6,003
       in bonus payments paid in connection with the KKR acquisition, $1,088 in
       provisions to conform the accounting policies with respect to accounts
       receivable reserves, as well as employee vacation and sick pay reserves
       in connection with the SMT merger, $2,164 in employee severance costs in
       connection with the SMT merger, $3,075 in professional fees and other
       merger integration costs associated with the SMT merger and other
       acquired entities, and $3,529 for assessments to settle regulatory
       matters associated with the direct patient billing process of one of our
       acquired entities. Recapitalization, merger integration and regulatory
       costs for the year ended December 31, 1998, represents $1,846 in special
       non-recurring bonuses paid in connection with the MTI acquisition, $722
       of professional fees associated with accounting and billing systems
       conversions of acquired companies, and a $250 provision for bad debt
       conforming accounting adjustment made in connection with the American
       Shared acquisition. Recapitalization, merger integration and regulatory
       costs for the year ended December 31, 1997, represents $16,350 in
       professional fees and other costs paid in connection with the acquisition
       of substantially all of our company by Apollo Investment Fund III, L.P.
       and its related entities.

    (c) Stock-based compensation of $333 for the year ended December 31, 2000,
       represents $55 for options issued to certain employees at exercise prices
       below the fair value of our common stock, $68 for Phantom Shares issued
       to four non-employee directors below fair market value, and $210 for
       common stock issued to one of our executive officers at below fair market
       value. Stock-based compensation of $100 for the year ended December 31,
       1998, represents options issued to certain employees at exercise prices
       below the fair value of our common stock.

(2) Adjusted EBITDA margin is calculated by dividing adjusted EBITDA by
    revenues.

(3) For purposes of calculating net debt to adjusted EBITDA, net debt is defined
    as long-term debt, including current maturities, less cash and cash
    equivalents.

(4) For purposes of calculating adjusted EBITDA to interest expense, net,
    interest expense, net, is defined as interest expense net of interest
    income. Interest expense includes amortization of debt issuance costs.

(5) For the purpose of calculating the ratio of earnings to fixed charges,
    earnings are defined as income from continuing operations before income
    taxes and extraordinary items, plus minority interest expense, plus
    distributions from equity investees, plus fixed charges, less income from
    equity investments. Fixed charges are the sum of interest on all
    indebtedness, amortization of debt issuance costs, and estimated interest on
    rental expense. Earnings were inadequate to cover fixed charges by
    $4.2 million and $21.4 million for the years ended December 31, 1997 and
    1999, respectively.

                                       23

               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

    We are a leading national provider of outsourced diagnostic imaging
services, with 91% of our 2000 revenues and 90% of our revenues for the first
quarter of 2001 derived from MRI. We provide imaging and therapeutic services
primarily to hospitals and other healthcare providers on a mobile,
shared-service basis. Our services normally include the use of our imaging or
therapeutic systems, technologists to operate the systems, equipment maintenance
and upgrades and management of day-to-day operations. We had 392 diagnostic
imaging and therapeutic systems, including 325 MRI systems, and 1,218 clients in
43 states at March 31, 2001.

    Approximately 90% of our revenues for the year ended December 31, 2000 and
for the quarter ended March 31, 2001 were generated by providing services to
hospitals and other healthcare providers, which we refer to as wholesale
revenues. Our wholesale revenues are typically generated from contracts that
require our clients to pay us based on the number of scans we perform, although
some pay us a flat fee for a period of time regardless of the number of scans we
perform. These payments are due to us independent of our clients' receipt of
reimbursement from third-party payors. We typically deliver our services for a
set number of days per week through exclusive, long-term contracts with
hospitals and other healthcare providers. These contracts, which are usually
three to five years in length, are typically non-cancelable by our clients and
often contain automatic renewal provisions. We price our contracts based on the
type of system used, the scan volume, and the number of ancillary services
provided.

    Approximately 10% of our revenues for the year ended December 31, 2000 and
for the quarter ended March 31, 2001 were generated by providing services
directly to patients from our sites located at or near hospital or other
healthcare provider facilities, which we refer to as retail revenues. Our
revenue from these sites is generated from direct billings to patients or their
third-party payors, which are recorded net of contractual discounts and other
arrangements for providing services at discounted prices. We typically charge a
higher price per scan under retail billing than we do under wholesale billing.

    The principal components of our operating costs, excluding depreciation, are
compensation paid to technologists and drivers, annual system maintenance costs,
transportation and travel costs, and system rental costs. Because a majority of
these expenses are fixed, increased revenue as a result of higher scan volumes
per system significantly improves our margins while lower scan volumes result in
lower margins.

    The principal components of selling, general and administrative expenses are
sales force compensation, marketing costs, business development expenses,
corporate overhead costs and our provision for doubtful accounts. In addition,
charges for non-cash stock-based compensation are also included in selling,
general and administrative expenses. In 2000, we recorded $0.3 million in stock-
based compensation as a result of grants of options to purchase our common stock
at an exercise price below its deemed value. For the quarter ended March 31,
2001, we recorded $0.1 million in stock-based compensation as a result of these
grants and will record an additional $3.0 million in charges over the next eight
years as a result of these grants.

    Additionally, one-half of the options granted under our 1999 Equity Plan are
"performance options." These options vest on the eighth anniversary of the grant
date if the option holder is still our employee, but the vesting accelerates if
we meet the operating performance targets specified in the option agreements. On
June 20, 2001, our compensation committee authorized us to enter into amended
option agreements to reduce the performance targets for the performance options.
As a result, if we achieve the reduced performance targets but do not achieve
the original performance targets, and an option holder terminates employment
prior to the eighth anniversary of the option grant date, we would be required
to record a non-cash compensation charge equal to the amount by

                                       24

which the actual value of the shares subject to the performance option on the
date of the amendment exceeded the option's exercise price. We estimate that we
could incur between $4 million and $7 million in the aggregate of these non-cash
compensation charges over the next four years. These charges, however, may not
be evenly distributed over each of those four years or over the four quarters in
any one year, depending upon the timing of employee turnover and the number of
shares subject to the options held by departing employees.

    Over the past five years, we have increased revenue through acquisitions,
increased scan volumes at existing client sites, and added new clients. During
this same period, the growth rate of our adjusted EBITDA (income before income
taxes, depreciation, amortization, net interest expense, recapitalization costs,
merger integration costs, regulatory costs, termination and related costs,
stock-based compensation, and extraordinary items) has exceeded the growth rate
of revenue primarily as a result of spreading our fixed costs over a larger
revenue base, implementing cost reduction and containment measures, and
converting leased MRI systems obtained through acquisitions to owned MRI
systems. In the second half of 2000, we added a substantial amount of
infrastructure and upgraded our information systems in anticipation of
supporting our future growth rate which increased our selling, general and
administrative expenses as a percentage of revenue in the first quarter of 2001
compared to the first quarter of 2000.

    We have historically focused on attempting to maximize cash flow and return
on invested capital nationwide and effectively deploying assets to maximize
utilization. In both 1999 and 2000, we made significant investments in adding to
and upgrading our MRI systems to improve service to our clients and add capacity
for future growth. These additions to our MRI systems had the effect of slowing
our growth rate in average daily scan volume per MRI system in 2000. Average
daily scan volume per MRI system increased by 0.5 and 0.1 scans per day in 1999
and 2000, as compared to each preceding year.

    At December 31, 2000, we had $167.7 million of net operating losses
available for federal tax purposes to offset future taxable income, subject to
certain limitations. These net operating losses begin to expire in 2003.

SEASONALITY

    We experience seasonality in the revenues and margins generated for our
services. First and fourth quarter revenues are typically lower than those from
the second and third quarters. First quarter revenue is affected primarily by
fewer calendar days and inclement weather, the results of which are fewer
patient scans during the period. Fourth quarter revenue is affected primarily by
holiday and client and patient vacation schedules and inclement weather, the
results of which are fewer patient scans during the period. The variability in
margins is higher than the variability in revenues due to the fixed nature of
our costs.

SIGNIFICANT ACQUISITIONS AND OTHER TRANSACTIONS

    On November 1, 2000, we acquired all of the outstanding common stock of
Southeast Arizona, Inc. as well as a mobile MRI system from one of its
affiliates. The purchase price was $4.1 million. The acquisition has been
accounted for as a purchase and, accordingly, the results of operations of
Southeast Arizona have been included in our consolidated financial statements
from the date of acquisition.

    On November 2, 1999, we merged with an affiliate of Kohlberg Kravis
Roberts & Co., L.P., or KKR, who acquired control of Alliance from existing
shareholders in a leveraged recapitalization transaction. The total value of the
transaction, including fees and expenses, was approximately $980 million. The
transaction was funded with senior secured credit facilities, a senior
subordinated credit facility, and common equity.

    On May 13, 1999, we acquired all the outstanding common stock of Three
Rivers Holding Corp., the parent corporation of SMT Health Services, Inc., in a
stock-for-stock merger. We exchanged

                                       25

approximately 1.6 million shares of common stock for all the outstanding common
shares of Three Rivers. At the time of the merger, Three Rivers was wholly owned
by affiliates of Apollo Management, L.P., which held approximately 82.6% of our
outstanding common stock. Accordingly, the merger has been accounted for as a
reorganization of entities under common control in a manner similar to a pooling
of interests. As such, our accompanying financial statements, footnotes, and
management's discussion and analysis of financial condition and results of
operations have been restated to include the assets, liabilities and operations
of SMT from the date when both entities were under Apollo's control, which was
December 18, 1997.

    On November 13, 1998, two of our wholly owned subsidiaries acquired all of
the outstanding common stock of CuraCare, Inc. and all of the partnership
interests in American Shared-CuraCare. The purchase price consisted of
approximately $13.4 million in cash plus the assumption of approximately
$12.2 million in financing arrangements. The transaction has been accounted for
as a purchase and, accordingly, the results of operations of CuraCare and
American Shared have been included in our consolidated financial statements from
the date of acquisition.

    On August 17, 1998, SMT acquired all of the outstanding common stock of RIA
Management Services, Inc. The acquisition was accounted for as a purchase and,
accordingly, the results of operations of RIA have been included in our
consolidated financial statements from the date of acquisition. The purchase
price consisted of approximately $2.1 million in cash plus the assumption of
approximately $1.1 million in financing arrangements.

    On May 19, 1998, we acquired Medical Diagnostics, Inc., a subsidiary of U.S.
Diagnostic, Inc. The purchase price consisted of approximately $31.0 million
plus the assumption of approximately $7.4 million in financing arrangements. The
acquisition has been accounted for as a purchase and, accordingly, the results
of operations of Medical Diagnostics have been included in our consolidated
financial statements from the date of acquisition.

    On March 12, 1998, we acquired Mobile Technology Inc., a provider of mobile
MRI services in the United States, in a transaction accounted for as a purchase.
We have included the operations of Mobile Technology in our consolidated
financial statements from the date of acquisition. The purchase price consisted
of $58.3 million for all of the equity interests in Mobile Technology plus
direct acquisition costs of approximately $2.0 million. In connection with the
acquisition, we also refinanced $37.4 million of Mobile Technology's outstanding
debt and paid Mobile Technology's direct transaction costs of $3.5 million.

    On January 2, 1998, Canton Holding Corp., a wholly owned subsidiary of SMT,
acquired all of the outstanding common stock of Mid American Imaging, Inc. and
Dimensions Medical Group, Inc. The acquisition was accounted for as a purchase
and accordingly, the results of operations of Mid American Imaging and
Dimensions Medical Group have been included in our consolidated financial
statements from the date of acquisition. The purchase price consisted of
approximately $10.4 million in cash plus the assumption of approximately
$5.1 million in financing arrangements.

RESULTS OF OPERATIONS

QUARTER ENDED MARCH 31, 2001 COMPARED TO QUARTER ENDED MARCH 31, 2000

    Revenue increased $7.0 million, or 8.3%, to $91.3 million in the first
quarter of 2001 compared to $84.3 million in the first quarter of 2000 primarily
due to higher scan-based MRI revenue and higher MRI revenue under fixed-fee
contracts. Overall, scan-based MRI revenue for the quarter ended March 31, 2001
increased $5.2 million, or 7.4%, compared to the quarter ended March 31, 2000
primarily as a result of a 10.4% increase in our MRI scan volume. We attribute
this increase to the increase in the number of scans for existing clients
primarily as a result of our continuing MRI systems upgrade program, and to
additional scan-based systems in operation. The average daily scan volume per
MRI system increased to 9.5 in the first quarter of 2001 from 9.4 in the first
quarter of 2000. The increase in scan-based revenue was partially offset by a
2.8% decrease in average price per MRI scan.

                                       26

The decrease in average price realized per scan is primarily the result of an
increase in wholesale revenue compared to retail revenue, which has a higher
per-scan price, as a percentage of total MRI revenue, granting price reductions
to certain clients, and clients achieving discounted price levels on incremental
scan volume. Fixed-fee MRI revenue increased $0.2 million, or 4.0%, due to an
increase in short and long-term fixed-fee system rental contracts. Additionally,
other revenue increased $1.6 million, or 19.1%, primarily due to an increase in
positron emission tomography, or PET, revenue.

    We had 325 MRI systems at March 31, 2001 compared to 296 MRI systems at
March 31, 2000. The increase was primarily a result of planned system additions
to satisfy client demand.

    Operating expenses, excluding depreciation, increased $3.3 million, or 9.0%,
to $39.9 million in the first quarter of 2001 compared to $36.6 million in the
first quarter of 2000. Payroll and related employee expenses increased
$2.0 million, or 10.8%, primarily as a result of an increase in the number of
employees necessary to support new systems in operation and an increase in
technologists' wages. System maintenance expense increased $1.0 million, or
12.7%, primarily due to an increase in the number of systems in service. Medical
supplies increased $0.4 million, or 30.4%, primarily as a result of an increase
in radiopharmaceutical expenses associated with PET. Rental expense decreased
$1.0 million, or 24.3%, resulting from a lower number of leased MRI systems and
transportation units in operation. Expenses incurred under management agreements
increased $0.3 million, or 28.7%. All other operating expenses, excluding
depreciation, increased $0.6 million, or 13.3%, primarily due to an increase in
the number of systems in operation and an increase in average daily scan volume.
Operating expenses, excluding depreciation, as a percentage of revenue,
increased from 43.4% in the first quarter of 2000 to 43.7% in the first quarter
of 2001 as a result of the factors described above.

    Depreciation expense increased $2.7 million, or 21.3%, to $15.4 million in
the first quarter of 2001 compared to $12.7 million in the first quarter of 2000
principally due to a higher amount of depreciable assets associated with system
additions and upgrades.

    Selling, general and administrative expenses increased $1.9 million, or
20.7%, to $11.1 million in the first quarter of 2001 compared to $9.2 million in
the first quarter of 2000. Payroll and related employee expenses increased
$1.1 million, or 21.1%, primarily due to increased staffing levels primarily in
the areas of patient billing and scheduling, information services, corporate
development, human resources and legal. Professional service expenses increased
$0.4 million, or 130%, primarily as a result of increased consulting costs for
information services, sales, and finance. Also, we recorded a $0.1 million
charge for stock-based compensation in the first quarter of 2001. All other
selling, general and administrative expenses increased $0.3 million. Selling,
general and administrative expenses as a percentage of revenue increased from
10.9% in the first quarter of 2000, to 12.2% in the first quarter of 2001 as a
result of the factors described above.

    Amortization expense, primarily related to goodwill, totaled $3.6 million in
the first quarter of 2001 and 2000.

    Interest expense, net, decreased $0.1 million, or 0.1%, to $18.8 million in
the first quarter of 2001 compared to $18.9 million in the first quarter of
2000, primarily as a result of a decrease in amortization of deferred financing
costs and a decrease due to one less day in the first quarter of 2001 compared
to the corresponding quarter in 2000. These factors were partially offset by
higher average interest rates and higher average outstanding debt balances
during the first quarter of 2001 as compared to the first quarter of 2000. The
interest rate on substantially all of our long-term debt is variable.

    Provision for income taxes in the first quarter of 2001 was $1.2 million,
resulting in an effective tax rate of 50.0%, primarily as a result of
non-deductible goodwill and state income taxes. Provision for income taxes in
the first quarter of 2000 was $1.4 million, resulting in an effective tax rate
of 50.0%, primarily as a result of non-deductible goodwill and state income
taxes.

                                       27

    Our net income was $1.2 million in the first quarter of 2001 compared to net
income of $1.4 million in the first quarter of 2000.

YEAR ENDED DECEMBER 31, 2000 COMPARED TO YEAR ENDED DECEMBER 31, 1999

    Revenue increased $27.2 million, or 8.6%, to $345.3 million in 2000 compared
to $318.1 million in 1999 primarily due to higher scan-based MRI revenue and
higher MRI revenue under fixed-fee contracts. Overall, scan-based MRI revenue in
2000 increased $18.7 million, or 6.8%, compared to 1999 primarily as a result of
an 11.5% increase in our MRI scan volume. We attribute this increase to the
increase in the number of scans for existing clients primarily as a result of
our continuing MRI systems upgrade program, and to additional scan-based systems
in operation. The average daily scan volume per MRI system increased to 9.4 in
2000 from an estimated 9.3 in 1999. The increase in scan-based revenue was
partially offset by a decrease in scan volume from clients who did not renew
their contracts and an estimated 4.3% decrease in average price per MRI scan.
The decrease in average price realized per scan is primarily the result of an
increase in wholesale revenue compared to retail revenue, which has a higher
per-scan price, as a percentage of total MRI revenue, granting price reductions
to certain clients, and clients achieving discounted price levels on incremental
scan volume. Fixed-fee MRI revenue increased $7.8 million, or 61.3%, due to an
increase in short and long-term fixed-fee system rental contracts. Additionally,
revenue associated with management agreements increased $1.6 million, or 23.8%,
and other revenue decreased $0.9 million, or 3.8%.

    We had 319 MRI systems at December 31, 2000 compared to 283 MRI systems at
December 31, 1999. The increase was primarily a result of planned system
additions to satisfy client demand.

    Operating expenses, excluding depreciation, increased $8.5 million, or 5.9%,
to $151.7 million in 2000 compared to $143.2 million in 1999. Payroll and
related employee expenses increased $8.2 million, or 13.0%, primarily as a
result of an increase in the number of employees necessary to support new
systems in operation and an increase in technologists' wages. Fuel expense
increased $1.1 million, or 36.6%, primarily as a result of an increase in fuel
prices as well as an increase in the number of shared use MRI systems in
operation. System rental expense decreased $2.3 million, or 20.3%, resulting
from a lower number of leased MRI systems in operation. Expenses incurred under
management agreements increased $1.1 million, or 29.7%. All other operating
expenses, excluding depreciation, increased $0.4 million. Operating expenses,
excluding depreciation, as a percentage of revenue, decreased from 45.0% in 1999
to 43.9% in 2000 as a result of spreading our fixed costs over a larger revenue
base and a conversion of leased systems to owned systems upon the expiration of
operating leases.

    Depreciation expense increased $7.8 million, or 16.6%, to $54.9 million in
2000 compared to $47.1 million in 1999 principally due to a higher amount of
depreciable assets associated with system additions and upgrades.

    Selling, general and administrative expenses increased $7.2 million, or
23.2%, to $38.3 million in 2000 compared to $31.1 million in 1999. Payroll and
related employee related expenses increased $2.3 million, or 11.9%, primarily
due to increased staffing levels primarily in the areas of retail billing and
collections, information systems, corporate development and legal. Professional
service expenses increased $1.0 million, or 101%, primarily as a result of
increased information services costs associated with training for the
implementation of our retail billing system as well as increased costs incurred
to support our financial, marketing and operations functions. Marketing and
business development expenses increased $0.4 million, or 78.7%, primarily as a
result of our sales and marketing efforts associated with positron emission
tomography, or PET, services. The provision for doubtful accounts increased by
$1.5 million primarily as a result of the growth in revenue. Also, we recorded
$0.8 million in expenses associated with a compliance review and a $0.3 million
charge for stock-based compensation in 2000. All other selling, general and
administrative expenses increased $0.9 million. Selling, general and
administrative expenses as a percentage of revenue increased from 9.8% in 1999,
to 11.1% in 2000 as a result of the factors described above.

                                       28

    Amortization expense, primarily related to goodwill, totaled $14.4 million
in 2000 and $14.6 million in 1999.

    Termination and related costs of $4.6 million for the year ended
December 31, 2000 represent $4.3 million associated with termination costs and
the repurchase of stock options for an executive officer who resigned his
management duties due to health-related issues and $0.3 million associated with
the recruitment of his replacement.

    Recapitalization, merger integration and regulatory costs of $4.5 million
for the year ended December 31, 2000 represent $0.7 million of professional fees
paid in connection with the KKR acquisition, $0.6 million of compensatory costs
related to stock option buy-backs and severance payments resulting from change
in control provisions triggered by the KKR acquisition, $0.1 million related to
additional severance for employees of SMT, $0.1 million of integration costs to
migrate acquired entities to a common systems platform for direct patient
billing, and $0.9 million for assessments and $2.1 million for costs and related
professional fees to settle regulatory matters associated with the direct
patient billing process of one of our acquired entities.

    Recapitalization, merger integration and regulatory costs of $52.6 million
for the year ended December 31, 1999 represent $19.6 million in professional
fees paid in connection with the KKR acquisition, $17.1 million related to the
purchase of outstanding stock options in connection with the KKR acquisition,
$6.0 million in bonus payments paid in connection with the KKR acquisition,
$1.1 million in provisions to conform the accounting policies with respect to
accounts receivable reserves, as well as employee vacation and sick pay reserves
in connection with the SMT Merger, $2.2 million in employee severance costs in
connection with the SMT Merger, $3.1 million in professional fees and other
merger integration costs associated with the SMT Merger and other acquired
entities, and $3.5 million for assessments to settle regulatory matters
associated with the direct patient billing process of one of the Company's
acquired entities.

    Interest expense, net, increased $25.1 million, or 48.3%, to $77.1 million
in 2000 compared to $52.0 million in 1999, as a result of higher average
outstanding debt balances during 2000 as compared to 1999. This increase was
primarily related to debt incurred in connection with the KKR acquisition and
increases in average interest rates in 2000 compared to 1999. The interest rate
on substantially all of our long-term debt is variable.

    Although we had a pre-tax loss in 2000, provision for income taxes in 2000
was $2.0 million, primarily as a result of non-deductible goodwill,
non-deductible KKR acquisition expenses and state income taxes. Although we had
a pre-tax loss in 1999, the provision for income taxes in 1999 was
$3.3 million, primarily as a result of non-deductible KKR acquisition expenses
and also non-deductible goodwill and state income taxes.

    In 1999, we recorded a $17.8 million extraordinary loss on the early
extinguishment of debt related to the KKR acquisition and SMT debt refinancing.

    We recorded a net loss in 2000 of $2.2 million, or $0.58 per share, compared
to a net loss in 1999 of $43.5 million, or $8.92 per share. The net loss per
common share calculation in 1999 reflects preferred stock dividends and
financing fee accretion of $2.1 million and excess of consideration paid over
carrying amount of preferred stock purchased of $2.8 million.

YEAR ENDED DECEMBER 31, 1999 COMPARED TO YEAR ENDED DECEMBER 31, 1998

    Revenue increased $74.8 million, or 30.7%, to $318.1 million in 1999
compared to $243.3 million in 1998, primarily due to acquisitions. The remaining
increase was due to higher scan-based MRI revenue, higher fixed fee MRI revenue
and an increase in other revenue, including revenue for other imaging and
therapeutic services. Overall, scan-based MRI revenue increased $65.0 million,
or 31.1%, compared to 1998 primarily as a result of a 35.7% increase in our MRI
scan volume primarily related to acquisitions. We attribute the non-acquisition
MRI scan volume increase to the increase in the

                                       29

number of scans for existing clients primarily as a result of our continuing MRI
systems upgrade program. The average daily scan volume per MRI system (adjusted
to include acquisitions) was an estimated 9.3 in 1999. We experienced an
estimated 3.4% decrease in the average revenue realized per MRI scan as compared
to 1998. The decrease in average revenue realized per scan is primarily the
result of clients achieving discount price levels on incremental scan volume and
granting price reductions to certain clients. Fixed fee MRI revenue increased
$5.7 million, or 80.9%, in 1999 compared to 1998 due to an increase in short-and
long-term fixed fee system rental contracts. Other revenue increased
$4.1 million, or 14.9%, primarily due to an increase in revenues from all other
imaging and therapeutic services.

    We had 283 MRI systems at December 31, 1999 compared to 273 MRI systems at
December 31, 1998. The increase was primarily a result of planned system
additions due to a growth in our client base.

    Operating expenses, excluding depreciation, increased $31.3 million, or
28.0%, to $143.2 million in 1999 compared to $111.9 million in 1998. Payroll and
related employee expenses increased $15.7 million, or 33.7%, primarily as a
result of the American Shared, Mobile Technology, and Medical Diagnostics
acquisitions as well as an increase in the number of employees necessary to
support new MRI systems in operation and increased scans per MRI system. System
maintenance expense increased $6.3 million, or 31.1%, due to an increase in the
number of systems in service and the expiration of warranties on an increased
number of MRI systems. All other operating expenses, excluding depreciation,
increased $9.3 million, or 20.6%, primarily as a result of increased costs
associated with revenue growth. Operating expenses, excluding depreciation, as a
percentage of revenue, decreased from 46.0% in 1998 to 45.0% in 1999 as a result
of spreading costs over a larger revenue base and a conversion of leased systems
to owned systems upon the expiration of operating leases.

    Depreciation expense increased $13.6 million, or 40.6%, to $47.1 million in
1999 compared to $33.5 million in 1998 principally due to a higher amount of
depreciable assets associated with system additions and upgrades and systems
acquired through acquisitions.

    Selling, general and administrative expenses increased $6.7 million, or
27.5%, to $31.1 million in 1999 compared to $24.4 million in 1998. Payroll and
related expenses increased $4.3 million, or 32.7%, primarily as a result of
increased staffing levels necessary to support our increased level of operations
and increased employee compensation related to increased sales commissions. The
provision for doubtful accounts increased $0.4 million primarily as a result of
our growth in revenue. All other selling, general and administrative expenses
increased $2.0 million, or 26.4%, primarily as a result of increased costs
associated with revenue growth. Selling, general and administrative expenses, as
a percentage of revenue, decreased from 10.0% in 1998 to 9.8% in 1999.

    Amortization expense, primarily related to goodwill, increased
$3.3 million, or 29.2%, to $14.6 million in 1999 compared to $11.3 million in
1998 as a result of acquisitions made during 1998.

    Recapitalization, merger integration and regulatory costs of $52.6 million
for the year ended December 31, 1999 represents $19.6 million in professional
fees paid in connection with the KKR acquisition, $17.1 million related to the
purchase of outstanding stock options in connection with the KKR acquisition,
$6.0 million in bonus payments paid in connection with the KKR acquisition,
$1.1 million in provisions to conform the accounting policies with respect to
accounts receivable reserves, as well as employee vacation and sick pay reserves
in connection with the SMT Merger, $2.2 million in employee severance costs in
connection with the SMT Merger, $3.1 million in professional fees and other
merger integration costs associated with the SMT Merger and other acquired
entities, and $3.5 million for assessments to settle regulatory matters
associated with the direct patient billing process of one of the Company's
acquired entities.

    Recapitalization, merger integration and regulatory costs of $2.8 million in
1998 represent $1.8 million in special non-recurring bonuses paid in connection
with the Mobile Technology acquisition, $0.7 million in professional fees
associated with accounting and billing systems conversions

                                       30

of acquired companies, and a $0.3 million provision for doubtful accounts
conforming accounting adjustment made in connection with the American Shared
acquisition.

    Interest expense, net, increased $10.2 million, or 24.4%, to $52.0 million
in 1999 compared to $41.8 million in 1998. This increase was primarily related
to debt incurred in connection with the KKR acquisition merger as well as
acquisitions made during this period. The interest rate on substantially all of
our long-term debt as of December 31, 1999 was variable.

    Although we had a pre-tax loss in 1999, provision for income taxes in 1999
was $3.3 million, primarily as a result of non-deductible KKR acquisition
expenses, and also non-deductible goodwill and state income taxes. Provision for
income taxes in 1998 was $8.7 million, resulting in an effective tax rate of
49.6% which differed from the statutory tax rate primarily as a result of
non-deductible goodwill.

    In 1999, we recorded a $17.8 million extraordinary loss on the early
extinguishments of debt related to the KKR acquisition and acquisitions. In
1998, we recorded a $2.3 million extraordinary loss on early extinguishments of
debt related to acquisitions.

    We recorded a net loss in 1999 of $43.5 million, or $8.92 per share,
compared to net income in 1998 of $6.6 million, or $0.77 per share. The net loss
per common share calculation in 1999 reflects preferred stock dividends and
financing fee accretion of $2.1 million and excess of consideration paid over
carrying amount of preferred stock purchased of $2.8 million. In 1998, the net
loss per common share calculation reflects preferred stock dividends and
financing fee accretion of $2.2 million.

LIQUIDITY AND CAPITAL RESOURCES

    We generated cash of $92.0 million and $38.2 million from operating
activities in 2000 and 1999, respectively and $8.3 million for the first quarter
of 2001. We used cash of $91.0 million and $104.1 million for investing
activities in 2000 and 1999, respectively and $18.8 million for the first
quarter of 2001. We incur capital expenditures for the purposes of:

    - providing upgrades of our MRI systems and upgrading our corporate
      infrastructure for future growth;

    - purchasing systems upon termination of operating leases;

    - replacing less advanced systems with new systems; and

    - purchasing new systems.

    Capital expenditures totaled $101.6 million during the year ended
December 31, 2000. Capital expenditures totaled $95.9 million during the year
ended December 31, 1999. Capital expenditures totaled $21.2 million during the
quarter ended March 31, 2001. During the year ended December 31, 2000, we
purchased 55 MRI systems, including replacement systems. During the quarter
ended March 31, 2001, we purchased 10 MRI systems, including replacement
systems. Our decision to purchase a new system is typically predicated on
obtaining new or extending existing client contracts, which serve as the basis
of demand for the new system. We expect to purchase additional systems in 2001
and finance substantially all of these purchases with our available cash, cash
from operating activities and our revolving line of credit. We expect capital
expenditures to total approximately $75 million in 2001, which expenditures
shall consist primarily of equipment purchases and upgrades.

    In connection with the KKR acquisition, we entered into a $616.0 million
credit agreement and also entered into a $260.0 million senior subordinated
credit facility agreement with KKR. The credit agreement contains restrictive
covenants which, among other things, limit the incurrence of additional
indebtedness, dividends, transactions with affiliates, asset sales,
acquisitions, mergers and consolidations, liens and encumbrances, capital
expenditures and prepayments of other indebtedness. Additionally, the credit
agreement contains financial covenants which require a minimum interest coverage
ratio of 1.5 to 1.0, as well as a maximum leverage ratio of 6.0 to 1.0. As of
March 31, 2001, we are in compliance with all of the material covenants
contained in our credit agreement and other indebtedness.

                                       31

    We used the aggregate proceeds from the offering of the old notes to repay
our senior subordinated credit facility.

    The maturities of our existing long-term debt total $15.9 million in 2001,
$18.0 million in 2002, $28.4 million in 2003, $28.8 million in 2004 and
$35.6 million in 2005.

    We believe that, based on current levels of operations and anticipated
growth, our cash from operations, together with other available sources of
liquidity, including borrowings available under our revolving loan facility,
will be sufficient over the next year to fund anticipated capital expenditures
and make required payments of principal and interest on our debt, including
payments due under our credit agreement. Neither the KKR acquisition nor our
current level of debt has altered our practice of making capital expenditures.

    Our expansion and acquisition strategy may require substantial capital, and
no assurance can be given that we will be able to raise any necessary additional
funds through bank financing or the issuance of equity or debt securities on
terms acceptable to us, if at all.

QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK

    We sell our services exclusively in the United States and receive payment
for our services exclusively in United States dollars. As a result, our
financial results are unlikely to be affected by factors such as changes in
foreign currency exchange rates or weak economic conditions in foreign markets.

    Our interest expense is sensitive to changes in the general level of
interest rates in the United States, particularly because the majority of our
indebtedness has interest rates which are variable. The recorded carrying amount
of our long-term debt approximates fair value as these borrowings have variable
rates that reflect currently available terms and conditions for similar debt.

    Our interest income is sensitive to changes in the general level of interest
rates in the United States, particularly because the majority of our investments
are in short-term instruments.

    The recorded carrying amounts of cash and cash equivalents approximate fair
value due to their short-term maturities.

RECENT ACCOUNTING PRONOUNCEMENTS

    In December 1999, the staff of the Securities and Exchange Commission issued
Staff Accounting Bulletin No. 101 ("SAB 101"), "Revenue Recognition in Financial
Statements". SAB 101 provides guidance on applying generally accepted accounting
principles to revenue recognition issues in financial statements. The adoption
of SAB 101 had no impact on our results of operations or financial position.

    In March 2000, the Financial Accounting Standards Board issued FASB
Interpretation No. 44 ("FIN 44"), "Accounting for Certain Transactions Involving
Stock Compensation". FIN 44 clarifies the application of Accounting Principles
Board ("APB") Opinion No. 25 regarding (a) the definition of employee for
purposes of applying APB Opinion No. 25, (b) the criteria for determining
whether a stock option plan qualifies as a non-compensatory plan, (c) the
accounting consequence of various modifications to the terms of a previously
fixed stock option or award, and (d) the accounting for an exchange of stock
compensation awards in a business combination. FIN 44 is effective July 1, 2000,
but certain conclusions cover specific events that occurred after either
December 15, 1998, or January 12, 2000. We believe that the adoption of FIN 44
will not have a material effect on our consolidated results of operations or
financial position.

    Effective January 1, 2001, we adopted Statement of Financial Accounting
Standards No. 133, "Accounting for Derivative and Hedging Activities", as
amended. This statement establishes a new model for accounting for derivatives
and hedging activities. Under SFAS 133, all derivatives must be recognized as
assets and liabilities and measured at fair value. We currently do not have any
derivative instruments, which require fair value measurement under SFAS 133 and,
accordingly, the effect of the adoption will not have a material impact on our
results of operations or financial position.

                                       32

                                    BUSINESS

    We are a leading national provider of outsourced diagnostic imaging
services, with 91% of our 2000 revenues and 90% of our revenues for the first
quarter of 2001 derived from MRI. We provide imaging and therapeutic services
primarily to hospitals and other healthcare providers on a mobile,
shared-service basis. Our services normally include the use of our imaging or
therapeutic systems, technologists to operate the systems, equipment maintenance
and upgrades and management of day-to-day operations. We also offer ancillary
services including marketing support, education and training and billing
assistance. We had 392 diagnostic imaging and therapeutic systems, including 325
MRI systems, and 1,218 clients in 43 states at March 31, 2001.

    We typically deliver our services through exclusive, long-term contracts
with hospitals and other healthcare providers which generally require them to
pay us monthly, based on the number of scans we perform. These contracts are
usually three to five years in length, are typically non-cancelable by our
clients and often contain automatic renewal provisions. For the year ended
December 31, 2000 and the quarter ended March 31, 2001, we received
approximately 90% of our revenues from direct billing of our clients.

    Our clients, primarily small-to-mid-sized hospitals, contract with us to
provide outsourced diagnostic imaging systems and therapeutic services in order
to:

    - avoid capital investment and financial risk associated with the purchase
      of their own systems;

    - provide access to MRI and other services for their patients when the
      demand for these services does not justify the purchase of a system;

    - benefit from upgraded imaging systems without direct capital expenditures;

    - eliminate the need to recruit, train and manage qualified technologists;

    - make use of our ancillary services; and

    - gain access to services under our regulatory and licensing approvals when
      they do not have these approvals.

    On November 2, 1999, we merged with an affiliate of Kohlberg Kravis
Roberts & Co., L.P., or KKR, who acquired control of Alliance from existing
shareholders in a leveraged recapitalization transaction. We refer to this
transaction as the KKR acquisition throughout this prospectus. The total value
of the transaction, including fees and expenses, was approximately
$980 million. The transaction was funded with senior secured credit facilities,
a senior subordinated credit facility, and common equity. The KKR acquisition
did not result in any material changes in the nature of our business other than
the before-mentioned increase in our indebtedness.

INDUSTRY OVERVIEW

    Diagnostic imaging services are noninvasive procedures that generate
representations of the internal anatomy and convert them to film or digital
media. Diagnostic imaging systems facilitate the early diagnosis of diseases and
disorders, often minimizing the cost and amount of care required and reducing
the need for costly and invasive diagnostic procedures. The market for
diagnostic imaging services in the United States was estimated to be
approximately $66 billion in 1999.

MRI

    The market for MRI services in the United States was estimated to be
$6.7 billion in 1999. Of the approximately 14.6 million MRI scans in 2000, 44%
were performed by hospitals with their own equipment, 33% were performed by
independent imaging centers and 23% were performed by mobile MRI providers.

                                       33

    MRI involves the use of high-strength magnetic fields to produce
computer-processed cross-sectional images of the body. Due to its superior image
quality, MRI is the preferred imaging technology for evaluating soft tissue and
organs, including the brain, spinal cord and other internal anatomy. With
advances in MRI technology, MRI is increasingly being used for new applications
such as imaging of the heart, chest and abdomen. Conditions that can be detected
by MRI include multiple sclerosis, tumors, strokes, infections, and injuries to
the spine, joints, ligaments, and tendons. Unlike x-rays and computed
tomography, which are other diagnostic imaging technologies, MRI does not expose
patients to potentially harmful radiation.

    MRI technology was first patented in 1974, and MRI systems first became
commercially available in 1983. Since then, manufacturers have offered
increasingly sophisticated MRI systems and related software to increase the
speed of each scan and improve image quality. Magnet strengths are measured in
tesla, and MRI systems typically use magnets with strengths ranging from 0.2 to
1.5 tesla. The 1.0 and 1.5 tesla strengths are generally considered optimal
because they are strong enough to produce relatively fast scans but are not so
strong as to create discomfort for most patients. Manufacturers have worked to
gradually enhance other components of the machines to make them more versatile.
Many of the hardware and software systems in recently manufactured machines are
modular and can be upgraded for much lower costs than purchasing new systems.

    MRI has gradually captured a larger portion of the diagnostic imaging
market. The total number of MRI scans has increased at an estimated compound
annual growth rate of 10.5% from 5.4 million in 1990 to approximately
14.6 million in 2000. The number of MRI scans is projected to grow at
approximately the same rate through 2006.

    The MRI industry has experienced growth as a result of:

    - recognition of MRI as a cost-effective, noninvasive diagnostic tool;

    - superior soft-tissue image quality of MRI versus that of other diagnostic
      imaging technologies;

    - wider physician acceptance and availability of MRI technology;

    - growth in the number of MRI applications;

    - MRI's safety when compared to other diagnostic imaging technologies,
      because it does not use potentially harmful radiation; and

    - increased overall demand for healthcare services, including diagnostic
      services, for the aging population.

OTHER DIAGNOSTIC IMAGING SERVICES

    - POSITRON EMISSION TOMOGRAPHY, OR PET. PET is a nuclear medicine procedure
      that produces pictures of the body's metabolic and biologic functions. PET
      can provide earlier detection of certain cancers, coronary diseases or
      neurologic problems than other diagnostic imaging systems. It is also
      useful for the monitoring of these conditions.

    - COMPUTED TOMOGRAPHY, OR CT. In CT imaging, a computer analyzes the
      information received from an x-ray beam to produce multiple
      cross-sectional images of a particular organ or area of the body. CT
      imaging is used to detect tumors and other conditions affecting bones and
      internal organs.

    - OTHER SERVICES. Other diagnostic imaging technologies include x-ray,
      single photon emission computed tomography, and ultrasound.

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IMAGING SETTINGS

    MRI and other imaging services are typically provided in one of the
following settings:

    - HOSPITALS AND CLINICS. Imaging systems are located in and owned and
      operated by a hospital or clinic. These systems are primarily used by
      patients of the hospital or clinic, and the hospital or clinic bills
      third-party payors, such as health insurers, Medicare or Medicaid.

    - INDEPENDENT IMAGING CENTERS. Imaging systems are located in permanent
      facilities not generally owned by hospitals or clinics. These centers
      depend upon physician referrals for their patients and generally do not
      maintain dedicated, contractual relationships with hospitals or clinics.
      In fact, these centers may compete with hospitals or clinics that have
      their own systems to provide imaging services to these patients. Like
      hospitals and clinics, these centers bill third-party payors for their
      services.

    - OUTSOURCED. Imaging systems, largely located in mobile trailers but also
      provided in fixed facilities, provide services to a hospital or clinic on
      a shared-service or full-time basis. Generally, the hospital or clinic
      contracts with the imaging service provider to perform scans of its
      patients, and the imaging service provider is paid directly by that
      hospital or clinic instead of by a third-party payor.

OUR COMPETITIVE STRENGTHS

LARGEST NATIONAL PROVIDER OF OUTSOURCED MRI SERVICES

    We believe we are the largest national provider of outsourced MRI services,
based on systems deployed, with 325 MRI systems in operation in 42 states at
March 31, 2001. We believe our size allows us to achieve operating, purchasing
and administrative efficiencies, including:

    - the ability to maximize equipment utilization through efficient deployment
      of our mobile systems;

    - equipment purchasing savings from equipment manufacturers;

    - favorable service and maintenance contracts from equipment manufacturers;
      and

    - the ability to minimize the time our systems are unavailable to our
      clients as a result of our flexibility in system deployment.

    We also believe our size has enabled us to establish a well-recognized brand
name and an experienced management team with a detailed knowledge of the
competitive and regulatory environments within the diagnostic imaging services
industry.

EXCLUSIVE, LONG-TERM CONTRACTS WITH A DIVERSE CLIENT BASE

    We generate substantially all of our revenues from exclusive, long-term
contracts with hospitals and other healthcare providers. These contracts are
usually three to five years in length, are typically non-cancelable by our
clients and often have automatic renewal provisions. We believe we have
developed strong relationships with our clients, as evidenced by our contract
renewal rate of 85% in 2000 and 81% for the first quarter of 2001. During 2000
and for the first quarter of 2001, no single client accounted for more than 3%
of our revenue.

REDUCED REIMBURSEMENT RISK

    Generally, hospitals, clinics and independent imaging centers bill patients
or third-party payors, such as health insurers, for their imaging services. In
contrast, for the year ended December 31, 2000 and for the quarter ended
March 31, 2001, approximately 90% of our revenues were generated by providing
services to hospitals and clinics that are obligated to pay us regardless of
their receipt of reimbursement from third-party payors. Accordingly, our
exposure to uncollectible patient receivables is

                                       35

minimized, as evidenced by our bad debt expense of only 1.6% of net revenues for
the year ended December 31, 2000 and for the quarter ended March 31, 2001. In
addition, we believe that the number of days outstanding for our receivables,
which averaged 55 days for the year ended December 31, 2000 and 57 days for the
quarter ended March 31, 2001, is among the most favorable in the healthcare
services industry.

COMPREHENSIVE OUTSOURCING SOLUTION

    We offer our clients a comprehensive outsourcing solution which includes our
imaging services and ancillary services, such as marketing support, education
and training and billing assistance. In some cases, we provide services under
our regulatory and licensing approvals for clients when they do not have these
approvals. We believe that a comprehensive outsourcing solution is an important
factor when potential clients select an outsourcing provider. We also believe
that some clients recognize the benefits of our solution and will continue to
contract for our outsourcing services even if their scan volume may justify the
purchase of their own imaging system.

ADVANCED MRI SYSTEMS

    Our MRI systems are among the newest and most advanced in the industry due
to the significant resources we have invested over the last three years to
replace and upgrade existing systems and to purchase new systems. Our
technologically advanced systems can perform high quality scans more rapidly and
can be used for a wider variety of imaging applications than less advanced
systems. Approximately 58% of our MRI systems have been purchased in the last
three years and approximately 88% of our MRI systems are equipped with
high-strength magnets that allow high-speed imaging. Moreover, technological
change in this field is gradual and most of our systems can be upgraded with
software and hardware enhancements, which should allow us to continue to provide
advanced technology without purchasing entire new systems.

EXPERIENCED EXECUTIVE MANAGEMENT TEAM

    We have an experienced team of executives who have worked in the healthcare
industry an average of 19 years. Our executive management team currently owns
approximately 12% of our common equity on a fully diluted basis.

OUR GROWTH STRATEGIES

INCREASE THE NUMBER OF SCANS AT EXISTING CLIENTS

    We intend to continue to increase the overall number of scans we perform for
our existing clients. We have invested in advanced MRI systems which are faster
and capable of scanning for a broad range and increasing number of medical
conditions. We believe these capabilities will result in an increase in the
number of scans performed for our clients. Furthermore, we attempt to educate
physicians about the advantages of MRI and new imaging procedures and
applications, which we believe will also lead to increased number of scans.

ESTABLISH NEW CLIENT RELATIONSHIPS

    We primarily target small-to-mid-sized hospitals and other healthcare
providers as potential new clients for our services. As of December 31, 1999,
the small-to-mid-sized hospital market was estimated to include 4,956 hospitals.
Additionally, we intend to pursue relationships with physician groups, clinics
and other healthcare providers that could benefit from our shared-service
outsourcing solution. Providers in these markets are under increasing pressure
to offer a full range of services and must remain technologically competitive.
Because of this pressure, we believe this market represents an attractive target
for our outsourcing services. Additionally, we believe new client growth will
continue to come from healthcare providers requesting our other outsourced
imaging services.

                                       36

INCREASE MRI SYSTEM UTILIZATION

    The average number of scans performed for each of our MRI systems on a given
day was 9.4 in 2000 and 9.5 for the first quarter of 2001. We believe we can
increase this figure through efficient deployment of our mobile MRI systems to
existing and new clients. We believe we can further improve utilization of our
systems by working with our clients to improve patient scheduling and ensure
patient presence at these appointments. We also believe that our size and
geographic diversity positions us to benefit from increased demand for MRI
services.

EXPAND MRI APPLICATIONS

    We intend to use our existing national presence and client service
capabilities to introduce new MRI applications, including cardiac evaluation and
advanced chest and abdomen imaging. Most of these applications can be performed
by existing MRI systems, which may require some upgraded software and hardware
enhancements.

OFFER NEW IMAGING SERVICES

    We also intend to use our existing nationwide sales and operational
infrastructure and our client relationships to expand our outsourcing services
to include other imaging services. For example, we recently began expanding our
offering of positron emission tomography, or PET, services which are utilized in
the detection of certain cancers, coronary diseases or neurologic problems. Due
to recent approval of reimbursement for selected PET procedures by the Health
Care Financing Administration, we believe PET services present growth
opportunities.

PURSUE SELECTED STRATEGIC ACQUISITIONS

    We have been an active acquirer of imaging businesses, having acquired 141
MRI systems in five separate acquisitions since 1997. We believe our scale and
geographic diversity allows us to realize synergies from the acquisition of
imaging providers. We expect to continue to identify and evaluate opportunities
for acquisitions within our industry, although currently there are no agreements
or negotiations with respect to any specific transaction.

OUR SERVICES

    As of December 31, 2000, we provided our outsourcing services on the
following bases:

    - SHARED SERVICE. We offered 77% of our diagnostic imaging systems on a
      part-time basis. These systems are located in mobile trailers which are
      transported to our clients' locations. We schedule deployment of these
      mobile systems so that multiple clients can share use of the same system.
      The typical shared-service contract is three to five years in length.

    - FULL-TIME SERVICE. We offered 17% of our diagnostic imaging systems on a
      full-time, long-term basis. These systems are located in either mobile
      units or buildings located at or near a hospital or clinic. Full-time
      service systems are provided for the exclusive use of a particular
      hospital or clinic. We typically offer full-time services under contracts
      that range from five to ten years in length. Our relationships with our
      higher-volume shared-service clients have, from time to time, evolved into
      full-time arrangements.

    - INTERIM AND RENTAL SERVICES. We offered 6% of our diagnostic imaging
      systems to clients on a full-time, temporary basis. These systems are
      located in mobile trailers which are transported to our clients'
      locations. These clients may be unable to maintain the extra capacity to
      accommodate periods of peak demand for imaging services or may require
      temporary assistance until they can develop permanent imaging service
      centers at or near their facilities. Generally, we do not provide
      technologists to operate our systems in these arrangements.

                                       37

CONTRACTS AND PAYMENT

    Our typical contract is exclusive, three to five years in length,
non-cancelable by our clients and often subject to automatic renewal. Most of
our contracts require a fee for each scan we perform. With other contracts,
clients are billed on a fixed-fee basis for a period of time, regardless of the
number of scans performed. These fee levels are affected primarily by the number
of scans performed, the type of imaging system provided and the length of the
contract. To a lesser extent, our revenues are generated from direct billings to
patients or their medical payors. We typically reserve the right to reduce a
client's number of service days or terminate an unprofitable contract. In
addition, our sales representatives have been successful in renewing and
extending contracts prior to expiration, achieving an 85% contract renewal rate
in 2000 and an 81% contract renewal rate for the first quarter of 2001.

IMAGING SYSTEMS

    As of March 31, 2001, we operated 373 diagnostic imaging systems, comprising
325 MRI systems, 26 computed tomography systems, six positron emission
tomography systems and 16 other systems, substantially all of which we own. We
have made significant investments in our systems in an effort to ensure that we
maintain the newest, most advanced imaging systems that meet our clients' needs.
As of December 31, 2000, over 58% of our MRI systems had been purchased in the
last three years. Moreover, because we can upgrade most of our current MRI
systems, we believe we have reduced the potential for technological
obsolescence.

    We purchase our imaging systems from major medical equipment manufacturers,
primarily General Electric Medical Systems, Siemens Medical Systems and Philips
Medical Systems. Generally, we contract with clients for new or expanded
services prior to ordering new imaging systems in order to reduce our system
utilization risk. As one of the largest commercial purchasers of MRI systems in
the world, we believe we receive relatively attractive pricing for equipment and
service contracts from these equipment manufacturers.

THERAPEUTIC SERVICES

    In addition to diagnostic imaging, we also offer our clients therapeutic
services including lithotripsy and brachytherapy. Lithotripsy is a minimally
invasive therapeutic procedure for the treatment of kidney stones, typically
performed on an outpatient basis. Brachytherapy is a localized radiation
treatment for cancer. As of March 31, 2001, we owned 19 therapeutic systems.

SYSTEM MANAGEMENT AND MAINTENANCE

    We have divided the country into nine geographic regions. We have a local
presence in each region, none of which accounts for more than 17% of our
revenues. We believe we benefit from our regional managers' direct contact with
and knowledge of the markets we serve, which allows us to address the specific
needs of each local operating environment. Each region markets, manages, and
staffs the operation of its imaging systems and is run as a separate profit
center responsible for its own revenues, expenses and overhead. To complement
this regional arrangement, we have developed standardized contracts, operating
policies, and other procedures, which are implemented nationwide in an effort to
ensure quality, consistency and efficiency across all regions.

    We actively manage deployment of our imaging systems to increase their
utilization through the coordinated transportation of our mobile systems using
238 tractors. We examine client requirements, route patterns, travel times, fuel
costs and system availability in our deployment process. Our mobile
shared-service MRI systems are currently scheduled for as little as one-half day
and up to seven days per week at any particular client, with an average usage of
1.7 days per week per client. Drivers typically move the systems at night and
activate them upon arrival at each client location so that the systems are
operational when our technologists arrive.

                                       38

    Timely, effective maintenance is essential for achieving high utilization
rates of our MRI systems. We contract with the original equipment manufacturers
for comprehensive maintenance programs on our systems to minimize the period of
time the equipment is unavailable. System repair typically takes less than one
day but could take longer, depending upon the nature of the repair. During the
warranty period and maintenance contract term, we receive guarantees related to
equipment operation and availability.

SALES AND MARKETING

    Our national sales force consists of 28 members who identify and contact
potential clients. We also have 55 marketing representatives who are focused on
increasing the number of scans performed with our systems by educating
physicians about our new imaging applications and service capabilities. The
sales force is organized regionally under the oversight of regional vice
presidents and senior management. Furthermore, certain of our executive officers
and regional vice presidents also spend a portion of their time participating in
contract negotiations.

COMPETITION

    The market for diagnostic imaging services is highly fragmented and has few
national imaging service providers. We believe that the key competitive factors
affecting our business include:

    - the quality and reliability of service;

    - the quality and type of equipment available;

    - the availability of types of imaging and ancillary services;

    - the availability of imaging center locations and flexibility of
      scheduling;

    - pricing;

    - the knowledge and service quality of technologists;

    - the ability to obtain regulatory approvals; and

    - the ability to establish and maintain relationships with healthcare
      providers and referring physicians.

    We are, and expect to continue to be, subject to competition in our targeted
markets from businesses offering diagnostic imaging services, including existing
and developing technologies. There are many companies engaged in this market,
including one national competitor and many smaller regional competitors. Some of
our competitors may now or in the future have access to greater resources than
we do. We compete with other mobile providers, independent imaging centers,
physicians, hospitals, and other healthcare providers that have their own
diagnostic imaging systems, and equipment manufacturers that sell or lease
imaging systems to healthcare providers for mobile or full-time use. We may also
experience greater competition in states that currently have certificates of
need laws should these laws be repealed, thereby reducing barriers to entry in
that state.

EMPLOYEES

    As of April 30, 2001, we had 1,972 employees, of whom 1,501 were trained
diagnostic imaging technologists, patient coordinators or other technical
support staff. None of our employees are represented by a labor organization and
we are not aware of any activity seeking such organization. We believe we have
good relationships with our employees.

                                       39

PROPERTIES

    We lease approximately 43,400 square feet of space in four office buildings
in Anaheim, California for our executive and principal administrative offices.
We also lease a 15,600 square foot operations warehouse in Orange, California
and a 9,000 square foot operations warehouse in Childs, Pennsylvania, as well as
space for our regional offices.

REGULATION

    Our business is subject to extensive federal and state government
regulation. Although we believe that our operations comply with the laws
governing our industry, it is possible that new laws or interpretations of
existing laws will adversely affect our financial performance.

FRAUD AND ABUSE LAWS; PHYSICIAN REFERRAL PROHIBITIONS

    The healthcare industry is subject to extensive federal and state regulation
relating to licensure, conduct of operations, ownership of facilities, addition
of facilities and services and payment for services.

    In particular, the federal Anti-Kickback Law prohibits persons from
knowingly and willfully soliciting, receiving, offering or providing
remuneration, directly or indirectly, to induce either the referral of an
individual, or the furnishing, recommending, or arranging for a good or service,
for which payment may be made under a federal healthcare program such as the
Medicare and Medicaid Programs. The definition of "remuneration" has been
broadly interpreted to include anything of value, including for example gifts,
discounts, the furnishing of supplies or equipment, credit arrangements,
payments of cash, waivers of payments, ownership interests, and providing
anything at less than its fair market value. In addition, there is no one
generally accepted definition of intent for purposes of finding a violation of
the Anti-Kickback Law. For instance, one court has stated that an arrangement
will violate the Anti-Kickback Law where any party has the intent to unlawfully
induce referrals. In contrast, another court has opined that a party must engage
in the proscribed conduct with the specific intent to disobey the law in order
to be found in violation of the Anti-Kickback Law. The lack of uniform
interpretation of the Anti-Kickback Law makes compliance with the law difficult.
The penalties for violating the Anti-Kickback Law can be severe. These sanctions
include criminal penalties and civil sanctions, including fines, imprisonment
and possible exclusion from the Medicare and Medicaid programs.

    The Anti-Kickback Law is broad, and it prohibits many arrangements and
practices that are lawful in businesses outside of the healthcare industry.
Recognizing that the Anti-Kickback Law is broad and may technically prohibit
many innocuous or beneficial arrangements within the healthcare industry, the
U.S. Department of Health and Human Services issued regulations in July of 1991,
which the Department has referred to as "safe harbors." These safe harbor
regulations set forth certain provisions which, if met, will assure healthcare
providers and other parties that they will not be prosecuted under the federal
Anti-Kickback Law. Additional safe harbor provisions providing similar
protections have been published intermittently since 1991. Our arrangements with
physicians, physician practice groups, hospitals, and other persons or entities
who are in a position to refer may not fully meet the stringent criteria
specified in the various safe harbors. Although full compliance with these
provisions ensures against prosecution under the federal Anti-Kickback Law, the
failure of a transaction or arrangement to fit within a specific safe harbor
does not necessarily mean that the transaction or arrangement is illegal or that
prosecution under the federal Anti-Kickback Law will be pursued. Although our
arrangements may not fall within a safe harbor, we believe that our business
arrangements do not violate the Anti-Kickback Law because we are careful to
structure our arrangements to reflect fair market value and ensure that the
reasons underlying our decision to enter into a business arrangement comport
with the Anti-Kickback Law. However, even though we continuously strive to
comply with the

                                       40

requirements of the Anti-Kickback Law, liability under the Anti-Kickback Law may
still arise because of the intentions of the parties with whom we do business.
In addition, we may have Anti-Kickback Law liability based on arrangements
established by the entities we have acquired if any of those arrangements
involved an intention to exchange remuneration for referrals covered by the
Anti-Kickback Law. While we are not aware of any such intentions, we have only
limited knowledge regarding the intentions underlying those arrangements.
Conduct and business arrangements that do not fully satisfy one of these safe
harbor provisions may result in increased scrutiny by government enforcement
authorities such as the Office of the Inspector General of the U.S. Department
of Health and Human Services, or OIG.

    Many states have adopted laws similar to the federal Anti-Kickback Law. Some
of these state prohibitions apply to referral of patients for healthcare
services reimbursed by any source, not only the Medicare and Medicaid Programs.
Although we believe that we comply with both federal and state anti-kickback
laws, any finding of a violation of these laws could subject us to criminal and
civil penalties or possible exclusion from federal or state healthcare programs.
Such penalties would adversely affect our financial performance and our ability
to operate our business.

    In addition, the Ethics in Patient Referral Act of 1989, commonly referred
to as the federal physician self-referral prohibition or Stark Law, prohibits
physician referrals of Medicare and Medicaid patients to an entity providing
certain designated health services (including MRI and other diagnostic imaging
services) if the physician or an immediate family member has any financial
arrangement with the entity and no statutory or regulatory exception applies.
The Stark Law also prohibits the entity from billing for any such prohibited
referral. Initially, the Stark Law applied only to clinical laboratory services
and regulations applicable to clinical laboratory services were issued in 1995.
Earlier that same year, the Stark Law's self-referral prohibition expanded to
additional goods and services, including MRI and other imaging services. In
1998, the Health Care Financing Administration, or HCFA, published proposed
rules for the remaining designated health services, including MRI and other
imaging services, and in January of 2001, HCFA published a final rule which it
characterized as the first phase of what will be a two-phase final rule.
Although HCFA has stated that it intends to publish phase two shortly, it is
unclear when this will occur. Based on HCFA commentary and recent presidential
action, phase one of these final Stark Law regulations will likely become
effective in early 2002.

    A person who engages in a scheme to circumvent the Stark Law's referral
prohibition may be fined up to $100,000 for each such arrangement or scheme. In
addition, any person who presents or causes to be presented a claim to the
Medicare or Medicaid Program in violation of the Stark Law is subject to civil
monetary penalties of up to $15,000 per bill submission, an assessment of up to
three times the amount claimed, and possible exclusion from participation in
federal healthcare programs. Bills submitted in violation of the Stark Law may
not be paid by Medicare or Medicaid, and any person collecting any amounts with
respect to any such prohibited bill is obligated to refund such amounts.

    Several states in which we operate have enacted or are considering
legislation that prohibits physician self-referral arrangements or requires
physicians to disclose any financial interest they may have with a healthcare
provider to their patients when referring patients to that provider. Possible
sanctions for violating these state law physician self-referral and disclosure
requirements include loss of license and civil and criminal sanctions. State
laws vary from jurisdiction to jurisdiction and have been interpreted by the
courts or regulatory agencies infrequently.

    We believe our operations comply with these federal and state physician
self-referral prohibition laws. We do not believe we or anyone else has
established any arrangements or schemes involving any service of ours which
would violate the Stark Law prohibition against schemes designed to circumvent
the Stark Law, or any similar state law prohibitions. Because we have financial
arrangements with physicians and possibly their immediate family members, and
because we may not be aware of all those

                                       41

financial arrangements, we rely on physicians and their immediate family members
to avoid making referrals to us in violation of the Stark law and similar state
laws. If we receive such a prohibited referral which is not covered by
exceptions under the Stark law and applicable state law, our submission of a
bill for the referral could subject us to sanctions under the Stark law and
applicable state law. Any sanctions imposed on us under the Stark Law or any
similar state laws could adversely affect our financial results and our ability
to operate our business.

    The Health Insurance Portability and Accountability Act of 1996 created two
new federal crimes: healthcare fraud and false statements relating to healthcare
matters. The healthcare fraud statute prohibits knowingly and willfully
executing a scheme to defraud any healthcare benefit program, including private
payors. A violation of this statute is a felony and may result in fines,
imprisonment or exclusion from government sponsored programs such as the
Medicare and Medicaid Programs. The false statements statute prohibits knowingly
and willfully falsifying, concealing or covering up a material fact or making
any materially false, fictitious or fraudulent statement in connection with the
delivery of or payment for healthcare benefits, items or services. A violation
of this statute is a felony and may result in fines or imprisonment. The Health
Insurance Portability and Accountability Act of 1996 also will require us to
follow federal privacy standards for individually identifiable health
information and computer security standards for all health information. The
government recently published regulations to implement the privacy standards
under the Act. We are beginning to address compliance with the Act and
applicable regulations. At this time we have not projected the financial impact
of compliance, which may be significant. A violation of the Act's health fraud,
privacy or security provisions may result in criminal and civil penalties, which
may adversely affect our financial performance and our ability to operate our
business.

    Both federal and state government agencies are continuing heightened and
coordinated civil and criminal enforcement efforts. As part of announced
enforcement agency work plans, the federal government will continue to
scrutinize, among other things, the billing practices of hospitals and other
providers of healthcare services. The federal government also has increased
funding to fight healthcare fraud, and it is coordinating its enforcement
efforts among various agencies, such as the U.S. Department of Justice, the U.S.
Department of Health and Human Services Office of Inspector General, and state
Medicaid fraud control units. We believe that the healthcare industry will
continue to be subject to increased government scrutiny and investigations.

FEDERAL FALSE CLAIMS ACT

    Another trend affecting the healthcare industry is the increased use of the
federal False Claims Act and, in particular, actions under the False Claims
Act's "whistleblower" provisions. Those provisions allow a private individual to
bring actions on behalf of the government alleging that the defendant has
defrauded the federal government. After the individual has initiated the
lawsuit, the government must decide whether to intervene in the lawsuit and to
become the primary prosecutor. If the government declines to join the lawsuit,
then the individual may choose to pursue the case alone, in which case the
individual's counsel will have primary control over the prosecution, although
the government must be kept apprised of the progress of the lawsuit. Whether or
not the federal government intervenes in the case, it will receive the majority
of any recovery. If the litigation is successful, the individual is entitled to
no less than 15%, but no more than 30%, of whatever amount the government
recovers. The percentage of the individual's recovery varies, depending on
whether the government intervened in the case and other factors. Recently, the
number of suits brought against healthcare providers by private individuals has
increased dramatically. In addition, various states are considering or have
enacted laws modeled after the federal False Claims Act. Even in instances when
a whistleblower action is dismissed with no judgment or settlement, we may incur
substantial legal fees and other costs relating to an investigation. We are
currently subject to a whistleblower action. See "Business--Legal and
Administrative Proceedings." Future actions under the False Claims Act may

                                       42

result in significant fines and legal fees, which would adversely affect our
financial performance and our ability to operate our business.

    When an entity is determined to have violated the federal False Claims Act,
it must pay three times the actual damages sustained by the government, plus
mandatory civil penalties of between $5,000 to $10,000 for each separate false
claim. Liability arises, primarily, when an entity knowingly submits a false
claim for reimbursement to the federal government. Simple negligence should not
give rise to liability, but submitting a claim with reckless disregard of its
truth or falsity could result in substantial civil liability.

    Although simple negligence should not give rise to liability, the government
or a whistleblower may attempt and could succeed in imposing liability on us for
a variety of previous or current failures, including for example:

    - Failure to comply with the many technical billing requirements applicable
      to our Medicare and Medicaid business.

    - Failure to comply with Medicare requirements concerning the circumstances
      in which a hospital, rather than we, must bill Medicare for diagnostic
      imaging services we provide to outpatients treated by the hospital.

    - Failure of our hospital clients to accurately identify and report our
      reimbursable and allowable services to Medicare.

    - Failure to comply with the prohibition against billing for services
      ordered or supervised by a physician who is excluded from any federal
      healthcare programs, or the prohibition against employing or contracting
      with any person or entity excluded from any federal healthcare programs.

    - Failure to comply with the Medicare physician supervision requirements for
      the services we provide, or the Medicare documentation requirements
      concerning such physician supervision.

    - The past conduct of the companies we have acquired.

    We strive to ensure that we meet applicable billing requirements. However,
the costs of defending claims under the False Claims Act, as well as sanctions
imposed under the Act, could significantly affect our financial performance.

UNLAWFUL PRACTICE OF MEDICINE AND FEE SPLITTING

    The marketing and operation of our diagnostic imaging and therapeutic
systems are subject to state laws prohibiting the practice of medicine by
non-physicians. We believe that our operations do not involve the practice of
medicine because all professional medical services relating to our operations,
including the interpretation of scans and related diagnoses, are separately
provided by licensed physicians not employed by us. Some states have laws that
prohibit any fee-splitting arrangement between a physician and a referring
person or entity that would provide for remuneration paid to the referral source
on the basis of revenues generated from referrals by the referral source. We
believe that our operations do not violate these state laws with respect to fee
splitting.

CERTIFICATE OF NEED LAWS

    In some states, a certificate of need or similar regulatory approval is
required prior to the acquisition of high-cost capital items or services,
including diagnostic imaging systems or provision of diagnostic imaging services
by us or our clients. Certificate of need regulations may limit or preclude us
from providing diagnostic imaging services or systems. At present, 17 states in
which we operate have certificate of need laws that restrict the supply of MRI
machines and other types of advanced medical

                                       43

equipment to certain incumbent providers. Revenue from states with certificate
of need regulations represents approximately 50% of our total revenue in 2000.

    Certificate of need laws were enacted to contain rising healthcare costs,
prevent the unnecessary duplication of health resources, and increase patient
access for health services. In practice, certificate of need laws have prevented
hospitals and other providers who have been unable to obtain a certificate of
need from acquiring new machines or offering new services. In the past
17 years, some states have liberalized exemptions from certificate of need laws,
including, for example, Pennsylvania, Nebraska, New York, Ohio and Tennessee.
However, this liberalization of certificate of need restrictions has had little
impact on our performance. Our current contracts will remain in effect even if
the certificate-of-need states in which we operate modify their certificate of
need programs. However, a significant increase in the number of states
regulating our business through certificate of need or similar programs could
adversely affect us. Conversely, repeal of existing certificate of need
regulations in jurisdictions where we have obtained a certificate of need, or
certificate of need exemption, also could adversely affect us by allowing
competitors to enter our markets. Certificate of need laws are the subject of
continuing legislative activity.

REIMBURSEMENT

    We derive most of our revenues directly from healthcare providers rather
than third-party payors, including government programs such as the Medicare
Program. We derive a small percentage of our revenues from direct billings to
patients or their third-party payors. Services for which we submit direct
billings for Medicare and Medicaid patients typically are reimbursed by
contractors on a fee schedule basis. Net revenues from direct patient billing
amounted to approximately 10% of our revenue in 2000 and for the first quarter
of 2001.

    As a result of federal cost-containment legislation currently in effect,
Medicare generally pays for inpatient services under a prospective payment
system based upon a fixed amount for each Medicare patient discharge. Each
discharge is classified into one of many diagnosis related groups, or DRGs. A
pre-determined amount covers all inpatient operating costs, regardless of the
services actually provided or the length of the patient's stay. Because Medicare
reimburses a hospital for all services rendered to a Medicare patient on the
basis of a pre-determined amount based on the DRG, a hospital or free-standing
facility cannot be separately reimbursed for an MRI scan or other procedure
performed on the hospital inpatient. Many state Medicaid Programs have adopted
comparable payment policies.

    On August 1, 2000, the Health Care Financing Administration implemented a
Medicare outpatient prospective payment system under which services and items
furnished in hospital outpatient departments are reimbursed using a
pre-determined amount for each ambulatory payment classification, or APC. Each
APC is based on the specific procedures performed and items furnished during a
patient visit. Certain items and services are paid on a fee schedule, and for
certain drugs, biologics and new technologies, hospitals are reimbursed
additional amounts. This new development in reimbursement may significantly
affect our financial performance.

    In order for our hospital customers to receive payment from Medicare with
respect to our services, our services must be furnished in a "provider-based"
department or be a covered service furnished "under arrangements." On April 7,
2000, Medicare published new rules establishing criteria for being a
"provider-based" department. Our services to hospitals possibly may not meet
Medicare's new standards for being a "provider-based" service, although that is
uncertain because at this time very little guidance exists regarding the proper
interpretation of this new Medicare regulation. If our services to hospital
customers are not furnished in a "provider-based" setting, the services would
not be covered by Medicare unless they are found to be a service furnished
"under arrangements" to a hospital. The extent to which "under arrangements"
services may be covered by Medicare when they do not meet the "provider-based"
standards is unclear. In the Benefits Improvement and Protection Act of 2000,

                                       44

Congress postponed the effective date of the new regulations until October 1,
2002. In addition, Congress "grandfathered" until October 1, 2002 all sites that
were paid as provider-based sites as of October 1, 2000. As the Medicare rules
are clarified and as October 1, 2002 approaches, it may be necessary for us to
modify the contracts we have with hospital customers or to take other steps that
may affect our cost for our wholesale business or the manner in which we furnish
wholesale services to hospital customers.

    Payments to us by third-party payors depend substantially upon each payor's
reimbursement policies. Third-party payors may impose limits on reimbursement
for diagnostic imaging services or deny reimbursement for tests that do not
follow recommended diagnostic procedures. Because unfavorable reimbursement
policies have and may continue to constrict the profit margins of the hospitals
and clinics we bill directly, we have and may continue to need to lower our fees
to retain existing clients and attract new ones. Alternatively, at lower
reimbursement rates, a healthcare provider might find it financially
unattractive to own an MRI or other diagnostic imaging system, but could benefit
from purchasing our services. It is possible that third-party reimbursement
policies will affect the need or price for our services in the future, which
could significantly affect our financial performance and our ability to conduct
our business.

ENVIRONMENTAL, HEALTH AND SAFETY LAWS

    Our PET service and some of our other imaging and therapeutic services
require the use of radioactive materials. While this material has a short
half-life, meaning it quickly breaks down into inert, or non-radioactive
substances, using such materials presents the risk of accidental environmental
contamination and physical injury. We are subject to federal, state and local
regulations governing the storage, use and disposal of materials and waste
products. Although we believe that our safety procedures for storing, handling
and disposing of these hazardous materials comply with the standards prescribed
by law and regulation, we cannot completely eliminate the risk of accidental
contamination or injury from those hazardous materials. In the event of an
accident, we could be held liable for any damages that result, and any liability
could exceed the limits or fall outside the coverage of our insurance. We may
not be able to maintain insurance on acceptable terms, or at all. We could incur
significant costs and the diversion of our management's attention in order to
comply with current or future environmental laws and regulations. We have not
had material expenses related to environmental, health and safety laws or
regulations to date.

LEGAL AND ADMINISTRATIVE PROCEEDINGS

    In late 1999, we identified through a self-audit possible errors in billing
Medicare claims in Massachusetts, and we conducted a Medicare claims audit of
our Massachusetts retail billing operations for the preceding five-year period.
Upon completion of that audit and in the first part of 2000, we disclosed the
audit results to our Medicare Part B contractor, National Heritage Insurance
Company, or NHIC. NHIC reviewed the Medicare audit results and also reviewed
claims information with respect to a random sample of 30 claims that were
supplied to them in November 2000. On March 2, 2001, the Medicare carrier sent a
letter to us indicating its completion of its assessment and verification of our
comprehensive review of Medicare claims in Massachusetts. The letter assessed an
overpayment of $2.2 million and advised us of administrative appeals procedures
applicable to this overpayment. We have since remitted this amount to NHIC.
Also, related to the NHIC Audit, we expect to pay approximately $713,000 to the
Massachusetts MassHealth Program, approximately $35,000 to the federal
Department of Defense TRICARE Program, and approximately $475,000 pertaining to
coinsurance payments from patients. These amounts have been accrued and are
reflected in our statements of operations presented in this prospectus.

    An administrative action is pending, stemming from an audit of Medicaid
claims by MassPRO for outpatient MRI services provided during a twelve-month
period ending January 31, 1999. MassPRO is

                                       45

a Massachusetts not-for-profit organization that has contracted with the
Massachusetts Division of Medical Assistance and the Massachusetts Medicaid
Fraud Control Unit to oversee utilization management and billing compliance for
the State's Medicaid Program, which is part of a Massachusetts program called
MassHealth. The Division of Medical Assistance is the agency responsible for
implementing the State's MassHealth Program and the Massachusetts Medical Fraud
Control Unit is the agency responsible for ensuring legal compliance with the
Massachusetts Medicaid Program. The case involves an audit of Greater Boston
MRI, a limited partnership wholly owned by us. MassPRO alleged deficiencies in
documentation and billing requirements for MRI claims made by Greater Boston
MRI. The Massachusetts Division of Medical Assistance has revised its initial
determination by lowering the amount to be recovered in this matter based on our
administrative appeal; the Massachusetts Division of Medical Assistance is now
seeking approximately a $212,000 recovery related to the alleged deficiencies in
this case. Based on the audit, the Massachusetts Division of Medical Assistance
also sent a notice of proposed suspension from the program. At the present time,
Massachusetts is not seeking suspension of Greater Boston MRI, but may require
post-settlement reporting by the provider for some period of time to ensure
compliance with the Massachusetts MassHealth Program. This matter is in the
final stages of administrative settlement.

    We have accrued $4,350,000 for probable settlement of all of these issues.
While actual results could vary from this estimate, we believe that the
resolution of any deficient billing process will not have a material adverse
effect on our business.

    From time to time we are involved in routine litigation incidental to the
conduct of our business. We believe that none of this litigation pending against
us will have a material adverse effect on our business.

                                       46

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

    Our executive officers and directors, and their ages and positions, are as
follows:



NAME                                          AGE                              POSITION
----                                        --------   --------------------------------------------------------
                                                 
Richard N. Zehner.........................     48      Chairman of the Board of Directors and Chief Executive
                                                       Officer

Jamie E. Hopping..........................     47      Director, President and Chief Operating Officer

Kenneth S. Ord............................     55      Executive Vice President and Chief Financial Officer

Cheryl A. Ford............................     45      Executive Vice President

Terry A. Andrues..........................     50      Executive Vice President

Jay A. Mericle............................     46      Executive Vice President

Russell D. Phillips, Jr...................     38      General Counsel and Secretary

Howard K. Aihara..........................     37      Vice President and Corporate Controller

Henry R. Kravis...........................     57      Director

Michael W. Michelson......................     49      Director

George R. Roberts.........................     57      Director

David H.S. Chung..........................     33      Director


    RICHARD N. ZEHNER has served as our chairman and chief executive officer
since November 1988. Mr. Zehner was our founder and also served as our president
from 1983 through February 1998. He has served as a director since 1987. Prior
to founding the company, Mr. Zehner managed the diagnostic shared-services
division of National Medical Enterprises, the predecessor of Tenet Corporation,
a nationwide provider of healthcare services. Mr. Zehner began his career as an
x-ray technician and subsequently became a radiology department manager.

    JAMIE E. HOPPING has served as our president and chief operating officer
since November 2000 and has been a director since November 2000. Prior to
joining us, Ms. Hopping was an independent consultant to various healthcare
providers including Catholic Health East and Quorum Health from 1997 to 1999.
She was employed by Columbia/HCA Healthcare Corporation as the Western Group
president from 1996 to 1997, president of the South Florida Division from 1994
to 1996, chief operating officer of South Florida Division from 1993 to 1994 and
chief executive officer of Deering Hospital and Grant Center from 1990 to 1993.

    KENNETH S. ORD has served as our executive vice president and chief
financial officer since November 1998. From January 1998 to November 1998, he
served as our senior vice president, chief financial officer and secretary. From
February 1997 to September 1997 he served as executive vice president and chief
financial officer of Talbert Medical Management Corporation and from
February 1994 to February 1997 he served as senior vice president and chief
financial officer of FHP International Corporation, a publicly traded health
maintenance organization.

    CHERYL A. FORD has served as our executive vice president, Eastern United
States since November 1998. She is responsible for managing the Eastern,
Mid-Atlantic, New England and Southern regions. From February 1995 to
November 1998, she was our senior vice president, Eastern Region.

    TERRY A. ANDRUES has served as our executive vice president, Western United
States since November 1998. He is responsible for managing the Pacific,
Northwestern, Western, Central and Great Lakes regions. From 1991 to
November 1998, he served as our senior vice president of the Central and Pacific
Regions and from May 1987 to November 1991, he was our customer support manager
with responsibilities in technical education and marketing. Prior to joining us,
Mr. Andrues worked as a technologist at Pasadena's Huntington Medical Research
Institute, site of the nation's first clinical MRI system. Mr. Andrues maintains
his credential as a registered MRI technologist.

                                       47

    JAY A. MERICLE has served as our executive vice president, equipment and
services since February 1999. Mr. Mericle was our senior vice president from
1991 to 1999 and our vice president of operations from 1988 to 1991.

    RUSSELL D. PHILLIPS, JR.  has served as our general counsel and secretary
since March 1998. Prior to joining us, Mr. Phillips served as chief legal
officer of Talbert Medical Management Corporation, a publicly traded physician
practice management corporation from May 1997 to September 1997, and corporate
counsel to FHP International Corporation, a publicly traded health maintenance
organization from June 1992 to April 1997. Mr. Phillips was an associate with
Skadden, Arps, Slate, Meagher & Flom, LLP from 1987 through 1992.

    HOWARD K. AIHARA has served as our vice president, corporate controller
since September 2000. From 1997 until September 2000, Mr. Aihara was vice
president, finance, for UniMed Management Company, a physician practice
management company in Burbank, California. From 1995 through 1997, he was
executive director and corporate controller for AHI Healthcare Systems, Inc. of
Downey, California. AHI was a publicly traded physician practice management
company.

    HENRY R. KRAVIS has been a director since November 1999. Mr. Kravis has been
a founding partner of Kohlberg Kravis Roberts & Co., L.P. since its inception in
1976, and is a managing member of the limited liability company which serves as
the general partner of Kohlberg Kravis Roberts & Co., L.P. Mr. Kravis is also a
director of Accuride Corporation, Amphenol Corporation, Borden, Inc., The Boyds
Collection, Ltd., Evenflo Company Inc., The Gillette Company, IDEX Corporation,
KinderCare Learning Centers, Inc., KSL Recreation Corporation, MedCath Inc.,
PRIMEDIA Inc., Regal Cinemas, Inc., Sotheby's Holdings, Inc., Spalding Holdings
Corporation and Trinity Acquisition plc (Willis Corroon). Messrs. Kravis and
Roberts are first cousins.

    MICHAEL W. MICHELSON has been a director since November 1999. Mr. Michelson
is a member of the limited liability company which serves as the general partner
of Kohlberg Kravis Roberts & Co., L.P. Mr. Michelson is also a director of
Amphenol Corporation, AutoZone, Inc., Owens-Illinois, Inc., and KinderCare
Learning Centers, Inc.

    GEORGE R. ROBERTS has been a director since November 1999. Mr. Roberts has
been a founding partner of Kohlberg Kravis Roberts & Co. L.P. since its
inception in 1976, and is a managing member of the limited liability company
which serves as the general partner of Kohlberg Kravis Roberts & Co., L.P.
Mr. Roberts is also a director of Accuride Corporation, Amphenol Corporation,
Borden, Inc., The Boyd Collection, Ltd., DPL Inc. (The Dayton Power & Light
Company), Evenflo Company Inc., IDEX Corporation, KinderCare Learning
Centers, Inc., KSL Recreation Corporation, Owens-Illinois, Inc.,
PRIMEDIA, Inc., Safeway Inc., Spalding Holdings Corporation and Trinity
Acquisition plc (Willis Corroon). Messrs. Roberts and Kravis are first cousins.

    DAVID H.S. CHUNG has been a director since November 1999. Mr. Chung has been
an executive of Kohlberg Kravis Roberts & Co. since 1995. From 1993 to 1995,
Mr. Chung was a management consultant at McKinsey & Co. Mr. Chung is also a
director of Centric Software, Inc., MedCath Inc. and WorldCrest Group, Inc.

BOARD COMMITTEES

    We have an audit committee, a compensation committee and an executive
committee. The audit committee is responsible for recommending to the board of
directors the engagement of our outside auditors and reviewing our accounting
controls and the results and scope of audits and other services provided by our
auditors. The compensation committee is responsible for reviewing and
recommending to the board of directors the amount and type of non-stock
compensation to be paid to senior management and establishing, reviewing general
policies relating to compensation and benefits of employees and administering
our stock option plan. No interlocking relationship will exist between any
member of our compensation committee and any member of any other company's board
of directors or compensation committee.

    The executive committee exercises all powers and authority of the board of
directors with some exceptions as provided under Delaware law. The purpose of
the executive committee is to allow for decisions to be made on our behalf
between regular meetings of the board of directors.

                                       48

DIRECTOR COMPENSATION

    Our non-employee directors receive an annual fee of $25,000 and
reimbursement of travel expenses. Effective January 1, 2000, we established a
directors' deferred compensation plan for all non-employee directors. Each of
the four non-employee directors has elected to participate in the director plan
and have their annual fee of $25,000 deferred into a stock account and converted
quarterly into phantom shares. Upon retirement, separation from the board of
directors, or the occurrence of a change of control, each director has the
option of being paid cash or issued common stock for their phantom shares. Upon
issuance of the phantom shares, we recorded non-cash compensation of an
additional $68,000 for the difference between the fair market value and the
issuance price of the phantom shares.

EXECUTIVE COMPENSATION

    The following table sets forth the compensation earned including salary,
bonuses, commissions, stock options and other compensation during the three
fiscal years ended December 31, 1998, 1999 and 2000 by our chief executive
officer and our four next most highly compensated executive officers, each of
whose total annual compensation exceeded $100,000 in 2000 and Mr. Vincent Pino,
who would have been of one of our most highly compensated executive officers for
the year ended December 31, 2000 but for his retirement earlier that year. We
refer to these officers as our named executive officers elsewhere in this
prospectus.



                                                                                                 LONG-TERM COMPENSATION
                                                      ANNUAL COMPENSATION               -----------------------------------------
                                           ------------------------------------------   SECURITIES
                                                                           OTHER        UNDERLYING
                                                                          ANNUAL          STOCK         LTIP         ALL OTHER
PRINCIPAL POSITION              YEAR(1)     SALARY      BONUS         COMPENSATION(2)   OPTIONS(3)   PAYOUTS(4)   COMPENSATION(5)
------------------              --------   --------   ----------      ---------------   ----------   ----------   ---------------
                                                                                             
Richard N. Zehner ............    2000     $369,900   $  160,624          --               --           --          $   16,520
  Chief Executive Officer,        1999      351,300    2,746,090(6)       --              124,750       --           1,968,830
  Chairman of the Board of        1998      350,000      727,738(7)       --               25,000      $31,250         755,978
  Directors

Vincent S. Pino(8) ...........    2000     $315,100   $  428,776(9)       --               --           --          $   22,174
  Former President, Chief         1999      299,100    2,095,786(6)       --              114,800       --             774,277
  Operating Officer and           1998      275,000      537,435(7)       --               20,000      $25,000         451,776
  Director

Kenneth S. Ord ...............    2000     $285,500   $  212,561(9)       --               --           --          $      414
  Executive Vice President and    1999      271,000      847,825(6)       --               83,850       --             506,571
  Chief Financial Officer         1998      247,981      179,875          --               45,000       --                 320

Cheryl A. Ford ...............    2000     $173,200   $   61,000          --               --           --          $    3,999
  Executive Vice President        1999      165,500       92,194          --               30,000       --             215,152
                                  1998      145,000       70,035          --               13,500      $12,500           3,595

Terry A. Andrues .............    2000     $173,200   $   60,292          --               --           --          $    3,979
  Executive Vice President        1999      165,500       87,244          --               30,000       --             215,271
                                  1998      145,000       70,035          --               13,500      $12,500           3,595

Jay A. Mericle ...............    2000     $163,800   $   47,415          --               --           --          $    7,146
  Executive Vice President        1999      155,500       76,376          --               30,000       --           1,004,224
                                  1998      145,000       70,035          --               13,500      $12,500           6,191


------------------------------

 (1) Rows specified "2000," "1999" and "1998" represent fiscal years ended
     December 31, 2000, 1999 and 1998, respectively.

 (2) With respect to each named officer for each fiscal year this table excludes
     perquisites which did not exceed the lesser of $50,000 or 10% of the named
     officer's salary and bonus for the fiscal year.

 (3) Stock options were granted under our 1999 Equity Plan and 1997 Option Plan.

 (4) We made our final payments made under our 1995 long-term executive
     incentive plan in 1998.

 (5) Includes:

       - $736,525 and $426,900 in change in control payments which were paid in
         1998 to Messrs. Zehner and Pino, respectively, pursuant to their prior
         employment agreements.

       - 401(k) matching contributions (for 2000, 1999 and 1998, respectively):
         Mr. Zehner--$4,250, $4,443 and $3,330; Mr. Pino--$4,250, $4,522 and
         $3,330; Ms. Ford--$3,777, $3,603 and $3,330; Mr. Andrues--$3,757,
         $3,603, $3,330 and Mr. Mericle--$3,797, 3,576, and 3,330.

       - Cash payments in lieu of accrued vacation (for 2000, 1999 and 1998,
         respectively): Mr. Zehner--$0, $15,313 and $6,731; Mr. Pino--$17,510,
         $11,462 and $21,154; and Mr. Mericle--$3,144, $2,981 and $2,596.

                                       49

       - Cash payments for options tendered pursuant to our recapitalization in
         1999. Amounts paid in 1999 were as follows: Mr. Zehner--$1,930,196;
         Mr. Pino--$757,621; Mr. Ord--$505,899, Ms. Ford--$211,353;
         Mr. Andrues--$211,353 and Mr. Mericle--$997,448.

       - The balance for each named officer represents life insurance premiums
         paid by us.

 (6) Includes $2,458,651, $1,900,000 and $700,000 in bonus payments paid to
     Messrs. Zehner, Pino and Ord, respectively, upon closing of our
     recapitalization in 1999.

 (7) Includes $350,000 and $300,000 in bonus payments paid to Messrs. Zehner and
     Pino, respectively, upon the closing of the Mobile Technology Inc.
     acquisition in 1998.

 (8) Mr. Pino retired in 2000.

 (9) Includes $310,209 and $129,911 in bonus payments to Messrs. Pino and Ord in
     2000, respectively, pursuant to retention bonus agreements.

OPTION GRANTS IN LAST FISCAL YEAR

    We did not grant stock options to the named executive officers during the
2000 fiscal year. No stock appreciation rights have ever been granted to the
named executive officers.

AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
  VALUES

    The following table presents information with respect to options exercised
by each of the named executive officers in 2000 or cancelled in exchange for
payment in cash, as well as the unexercised options to purchase our common stock
granted under the 1999 Equity Plan and the 1997 Option Plan to the named
executive officers and held by them as of December 31, 2000.



                                                                        NUMBER OF SHARES                VALUE OF UNEXERCISED
                                                                     UNDERLYING UNEXERCISED             IN-THE-MONEY OPTIONS
                                       SHARES                          OPTIONS AT YEAR-END              AT FISCAL YEAR-END(1)
                                      ACQUIRED       VALUE         ---------------------------      -----------------------------
NAME AND PRINCIPAL POSITION          ON EXERCISE    REALIZED       EXERCISABLE   UNEXERCISABLE       EXERCISABLE    UNEXERCISABLE
---------------------------          -----------   ----------      -----------   -------------      -------------   -------------
                                                                                                  
Richard N. Zehner .................     --             --            114,552        112,275         $   9,086,569   $   4,406,794
  Chief Executive Officer and
  Chairman of the Board of
  Directors

Vincent S. Pino ...................     85,350     $3,084,000(2)      11,480        103,320(3)            450,590       4,055,310
  Former President, Chief Operating
  Officer and Director

Kenneth S. Ord ....................      6,750        303,539(2)      24,135         86,715             1,655,576       3,909,476
  Executive Vice President and
  Chief Financial Officer

Cheryl A. Ford ....................     --             --             11,800         27,000               858,886       1,059,750
  Executive Vice President

Terry A. Andrues ..................     --             --             11,800         27,000               858,886       1,059,750
  Executive Vice President

Jay A. Mericle ....................     --             --             11,800         27,000               858,886       1,059,750
  Executive Vice President


------------------------------

(1) There was no public trading market for our common stock as of December 31,
    2000. Accordingly, these values have been calculated based on our board of
    directors' determination of the fair market value of the underlying shares
    as of December 31, 2000 of $95.22 per share, less the applicable exercise
    price per share, multiplied by the number of underlying shares.

(2) Represents cash payments in exchange for cancellation of options.

(3) Unexercisable options were forfeited and cancelled as of January 1, 2001 by
    mutual agreement between us and Mr. Pino.

EMPLOYMENT AND CHANGE OF CONTROL ARRANGEMENTS

    We have entered into employment agreements with Mr. Zehner, Ms. Hopping and
Mr. Ord. Base compensation under the employment agreement for each of these
executives is subject to adjustment by the board of directors each year. In
addition, Mr. Zehner, Ms. Hopping and Mr. Ord are entitled to receive an annual
cash bonus based upon our achievement of certain operating and financial goals,
with an annual target bonus amount equal to a specified percentage of their
then-current annual base salary (75% in the case of Mr. Zehner, 70% in the case
of Ms. Hopping and 50% in the case of Mr. Ord). Ms. Hopping's cash bonus for
2001 will not be less than 46.2% of her base salary notwithstanding the
achievement of these goals. This bonus plan has been adopted and will be
administered by the compensation committee of the board of directors.

                                       50

    The employment agreements have terms of two years in the case of
Messrs. Zehner and Ord and one year in the case of Ms. Hopping. The terms of the
employment agreements of Mr. Zehner, Ms. Hopping and Mr. Ord automatically
extend by three months on the last day of each quarterly period and will
continue to be so extended unless either we or the executive give notice of a
desire to modify or terminate the agreement at least thirty days prior to the
quarterly extension date. We may terminate Mr. Zehner's, Ms. Hopping's or
Mr. Ord's employment at any time and for any reason and Mr. Zehner, Ms. Hopping
and Mr. Ord may resign at any time and for any reason. If we terminate the
employment of Mr. Zehner, Ms. Hopping or Mr. Ord without cause, or any of them
resigns with good cause, the employment agreements obligate us to:

    - pay any earned but unpaid salary, benefits or bonuses, including a
      prorated bonus for the year in which the severance occurred;

    - continue to provide for periods of two years in the case of
      Messrs. Zehner and Ord, and one year in the case of Ms. Hopping, benefits
      at least equal to those received prior to severance; and

    - provide the executive with outplacement services at a cost not to exceed
      $25,000.

    Additionally, each of Messrs. Zehner and Ord would receive, over time, an
amount equal to at least two times his combined then-current annual salary and
bonus for the prior year and Ms. Hopping would receive, over time, an amount
equal to her combined then-current annual salary and bonus for the prior year.

    We have also entered into employment agreements with Ms. Ford and
Messrs. Andrues and Mericle. Each employment agreement remains in effect until
notice of termination is given by either party. Each contract provides that the
officer will continue to receive his or her base salary and be entitled to earn
bonuses and participate in all benefit plans and programs at levels and pursuant
to terms that are substantially consistent with current levels and terms,
subject to periodic review and possible increases by our board of directors or
compensation committee. In addition, each contract provides that if the officer
is terminated by us other than for just cause, as defined in the agreement, or
if the officer terminates his or her employment as a result of a constructive
discharge, as defined in the agreement, then the officer will be entitled to a
cash severance benefit equal to six months of salary at his or her then current
rate of salary, payment of a cash amount based on the officer's historical
incentive compensation, acceleration of the vesting of stock options and
extension of the officer's participation in our benefits plan and receipt of a
car allowance for six months. If severance were to occur within one year prior
to or following a change of control or the officer elects to terminate his or
her employment for any reason within one year after a change in control, then
each employment agreement provides for a doubled cash severance benefit and
further extension of the officer's benefits and car allowance. For the purposes
of these employment agreements, a change of control has occurred if:

    - we transfer all or substantially all of our assets to any person or group;

    - any person or group becomes the beneficial owner, directly or indirectly,
      of 35% or more of the total voting power represented by all of our voting
      stock; or

    - any person or group obtains the right or power to elect or designate a
      majority of our board of directors.

401(K) PLAN

    We established a tax deferred 401(k) savings plan in January 1990. Effective
January 1, 2001, the 401(k) plan was amended and restated in its entirety.
Currently, all employees who are over 21 years of age are eligible to
participate after attaining three months of service. Employees may contribute
between 1% and 15% of their annual compensation. We match 50 cents for every
dollar of employee

                                       51

contributions up to 5% of their compensation, subject to statutory limitations.
The rates of pre-tax and matching contributions may be reduced with respect to
highly compensated employees, as defined in the Internal Revenue Code of 1986,
as amended, so that the 401(k) plan will comply with Sections 401(k) and 401(m)
of the Code. Pre-tax and matching contributions are allocated to each employee's
individual account, which are invested in selected fixed income or stock managed
accounts according to the directions of the employee. An employee's pre-tax
contributions are fully vested and nonforfeitable at all times. Matching
contributions vest over four years of service. An employee may forfeit unvested
amounts upon termination of employment, unless the termination is because of
death, disability or retirement, in which case matching contributions vest in
their entirety.

    Matching contributions made by us pursuant to the 401(k) plan to the named
executive officers for the 2000 fiscal year are included under "All Other
Compensation" in the Summary Compensation Table.

STOCK OPTION PLANS

    We have issued stock option to our employees under the following three
plans:

    - The 1999 Equity Plan for Employees of Alliance Imaging, Inc. and
      Subsidiaries dated November 2, 1999, or the 1999 Equity Plan;

    - The Alliance Imaging, Inc. 1997 Stock Option Plan dated December 18, 1997,
      as amended, or the 1997 Option Plan; and

    - The Three Rivers Holding Corp. 1997 Stock Option Plan dated October 14,
      1997, as amended, or the Three Rivers Plan.

    The 1999 Equity Plan, the 1997 Option Plan and the Three Rivers Plan are
collectively referred to in this registration statement as the plans. The plans
are designed to promote our interests by providing eligible persons with the
opportunity to acquire a proprietary interest, or otherwise increase their
proprietary interest, in us as an incentive for them to remain in our service.

        TYPES OF OPTIONS.  The Three Rivers Plan provides for the grant of
    options to our employees that are qualified as incentive stock options as
    defined by Section 422 of the Internal Revenue Code. The 1997 Option Plan
    provides for the grant of options to employees that are either incentive
    stock options or non-qualified options. The 1999 Equity Plan provides for
    the grant of options to employees, consultants or other persons with a
    unique relationship to us or our subsidiaries, and that are non-qualified
    options.

        OPTIONS AVAILABLE AND OUTSTANDING.  A total of 632,500 shares are
    reserved for issuance under the 1999 Equity Plan, of which 468,280 are
    currently subject to outstanding options. Currently there are options
    outstanding to purchase 182,327 shares under the 1997 Option Plan and 44,777
    shares under the Three Rivers Plan. The 1997 Option Plan and the Three
    Rivers Plan were amended upon completion of the KKR acquisition to provide
    that no further options would be granted under those plans after
    November 2, 1999, and there are no additional shares reserved for issuance
    under those plans. Options under the 1997 Option Plan and the Three Rivers
    Plan that were not cancelled as part of the KKR acquisition remain
    outstanding subject to the terms and conditions of the 1997 Option Plan, the
    Three Rivers Plan and the option agreements under which they were granted,
    as they have been amended. Upon completion of the KKR acquisition, most
    options granted under the 1997 Option Plan and the Three Rivers Plan became
    fully vested and exercisable. Certain individuals, including Messrs. Pino
    and Ord, waived immediate vesting of their options under the 1997 Option
    Plan upon completion of the KKR acquisition. Except for options for 11,250
    shares issued under the 1997 Option Plan that will vest on December 31, 2001
    according to the terms of that plan, all options issued under the 1997
    Option Plan and the Three Rivers Plan are fully vested.

                                       52

        ADMINISTRATION.  The compensation committee administers each of the
    plans. The compensation committee has authority to select the employees,
    consultants or others to whom options will be granted under the plans, the
    number of shares to be subject to those options, and the terms and
    conditions of the options. In addition, the compensation committee has the
    authority to construe and interpret the plans and to adopt rules for the
    administration, interpretation and application of the plans that are
    consistent with the terms of the plans. Options granted under the 1999
    Equity Plan become vested and exercisable as determined by the compensation
    committee at the time of the grant, at a price determined by the committee.
    However, options granted under the 1999 Equity Plan may not have an exercise
    price less than 85% of the fair market value of a share of common stock on
    the date of the grant.

        STOCKHOLDERS' AGREEMENT.  The options and shares acquired upon exercise
    of the options are subject to the terms and conditions of stockholders'
    agreements entered into by the option holders. The stockholders' agreements
    provide that except for limited exceptions, the option holder may not
    transfer, sell or otherwise dispose of any shares prior to the fifth
    anniversary of the purchase date. The restricted period for options granted
    under the 1997 Option Plan and the Three Rivers Plan that were not cancelled
    upon completion of the KKR acquisition began on November 2, 1999.

        AMENDMENT.  The 1997 Stock Option Plan and the Three Rivers Plan may be
    amended or modified by the board of directors. The 1999 Equity Plan may be
    amended or modified by the compensation committee, and may be terminated by
    the board of directors.

        EXERCISE.  Options granted under the plans may be exercised in cash or,
    at the discretion of the compensation committee, through the delivery of
    previously owned shares, through the surrender of shares which would
    otherwise be issuable upon exercise of the option, or any combination of the
    foregoing. In order to use previously owned shares to exercise an option
    granted under the Three Rivers Plan, the option holder must have owned the
    shares used for at least six months prior to the exercise of the option.

        CHANGE OF CONTROL.  Options granted under the 1997 Option Plan that have
    not vested will become fully vested and exercisable upon a change of
    control. A change of control is defined in the 1997 Option Plan as the
    occurrence of any of the following:

       - a sale to any person other than an affiliate of all our substantially
         all of our assets;

       - a sale by us of shares, by merger or otherwise, to a person other than
         an affiliate which would result in the person owning more than 50% of
         our outstanding capital stock; or

       - a sale by one of our stockholders of shares to a person other than an
         affiliate which would result in the person owning more than 50% of our
         outstanding capital stock.

        Under the 1999 Equity Plan, the compensation committee may, in its sole
    discretion, provide that options granted under the plan cannot be exercised
    after a change of control, in which case they will become fully vested and
    exercisable prior to the completion of the change of control. The committee
    may also provide that options remaining exercisable after the change of
    control may only be exercised for the consideration received by stockholders
    in the change of control, or its cash equivalent. A change of control is
    defined in the 1999 Equity Plan as the:

       - merger or consolidation of our corporation into another corporation;

       - exchange of all or substantially all of our assets for the securities
         of another corporation;

       - acquisition by another corporation of 80% or more of our then
         outstanding shares of voting stock; or

                                       53

       - recapitalization, reclassification, liquidation or dissolution of our
         corporation, or other adjustment or event which results in shares of
         our common stock being exchanged for or converted into cash, securities
         or other property.

LIMITATIONS OF LIABILITY AND INDEMNIFICATION MATTERS

    Our certificate of incorporation limits the liability of our directors and
executive officers for monetary damages for breach of their fiduciary duties to
the maximum extent permitted by Delaware law. Delaware law provides that
directors of a corporation will not be personally liable for monetary damages
for breach of their fiduciary duties as directors, except liability for:

    - any breach of their duty of loyalty to our company or our stockholders;

    - acts or omissions not in good faith or which involve intentional
      misconduct or a knowing violation of law;

    - unlawful payments of dividends or unlawful stock repurchases or
      redemptions as provided in Section 174 of the Delaware General Corporation
      Law; or

    - any transaction from which the director derived an improper personal
      benefit.

    The limits on a director or officer's liability in our certificate of
incorporation do not apply to liabilities arising under the federal securities
laws and do not affect the availability of equitable remedies such as injunctive
relief or rescission.

    Our certificate of incorporation together with our bylaws provide that we
must indemnify our directors and executive officers and may indemnify our other
officers and employees and other agents to the fullest extent permitted by law.
We believe that indemnification under our bylaws covers at least negligence and
gross negligence on the part of indemnified parties. Our bylaws also permit us
to secure insurance on behalf of any officer, director, employee or other agent
for any liability arising out of his or her actions in that capacity, regardless
of whether our bylaws would otherwise permit indemnification. We believe that
the indemnification provisions of our certificate of incorporation and bylaws
are necessary to attract and retain qualified persons as directors and officers.
We also maintain directors' and officers' liability insurance.

    At present we are not aware of any pending litigation or proceeding
involving any director, officer, employee or agent of our company where
indemnification will be required or permitted. Nor are we aware of any
threatened litigation or proceeding that might result in a claim for
indemnification.

                                       54

                              CERTAIN TRANSACTIONS

    We believe that we have executed all of the transactions set forth below on
terms no less favorable to us than we could have obtained from unaffiliated
third parties. It is our intention to ensure that all future transactions,
including loans, between us and our officers, directors and principal
stockholders and their affiliates, are on terms no less favorable to us than
those that we could obtain from unaffiliated third parties.

    On November 27, 2000 in connection with the purchase of 5,360 shares of our
common stock, Jamie E. Hopping, our president, chief operating officer and
director issued a full recourse promissory note to us in the amount of
approximately $300,000 plus interest at an annual rate of 6%. Payment of the
note is secured by the shares of common stock purchased. Principal in the amount
of $200,000 and the interest on that amount will be due upon the sale of
Ms. Hopping's Texas residence, and the remaining principal and interest will be
due upon the earlier of November 27, 2007 or Ms. Hopping's sale of the purchased
common stock.

    On August 8, 2000, in connection with the termination of Vincent S. Pino,
our former president, chief operating officer and director, management duties,
we purchased all of his options under the 1997 Stock Option Plan at a price in
the aggregate of approximately $3.8 million.

    On November 2, 1999, after obtaining the approval of our stockholders, we
were acquired by Kohlberg Kravis Roberts & Co., or KKR, in a leveraged
recapitalization merger transaction. As a result of the KKR acquisition, we
experienced an approximate 92% ownership change and Viewer Holdings LLC, which
was formed and is wholly owned by affiliates of KKR, obtained ownership of
approximately 92% of our outstanding common stock, and we refinanced
substantially all of our long-term debt. We paid $12,140,000 to KKR for
professional services rendered in connection with the KKR acquisition. In
addition, some of our executive officers agreed to indemnify us for breaches of
representations and warranties made on our behalf in the transaction
documentation.

    In connection with the KKR acquisition, we entered into an agreement for a
$260 million senior subordinated facility with KKR. The aggregate proceeds of
the offering of the old notes were used to repay the senior subordinated credit
facility. Pursuant to an agreement that was entered into in connection with the
KKR acquisition, KKR provides management, consulting and financial services to
us, including its service on our board of directors, and we paid KKR an annual
fee of $650,000 in 2000, and $122,000 in 1999 in quarterly installments in
arrears at the end of each calendar quarter, for these services. In addition, we
reimburse KKR and its affiliates for all reasonable costs and expenses incurred
in connection with:

    - the management, consulting and financial services provided by KKR; and

    - the ownership of our shares of common stock by KKR's affiliates.

    Pursuant to a purchase agreement dated as of September 1, 1999 with Alliance
Imaging Management, Inc., Acclaim Medical LLC and certain other individuals, we
completed the acquisition of Acclaim Medical LLC for the sum of $500,000 plus
warrants to purchase 20% of the equity interest in Acclaim Medical LLC as of
August 31, 2001. One of the former members of Acclaim Medical LLC is a child of
one of our named executive officers. One of the former members of Acclaim
Medical LLC is a child of one of our former executive officers.

    In 1999 and 1998, we paid Apollo Management, L.P. $628,000 and $750,000,
respectively, which represented a pro rata portion of its annual management fee.
Additionally, in 1998 we paid Apollo fees of $1,000,000 and $460,000 as
consideration for services rendered in structuring and negotiating the
acquisition of Mobile Technology and American Shared, respectively, and also
reimbursed Apollo for expenses of approximately $275,000 associated with these
acquisitions.

                                       55

    On May 13, 1999, we acquired all the outstanding common stock of Three
Rivers Holding Corp., the parent corporation of SMT Health Services, Inc. in a
stock-for-stock merger. We exchanged approximately 1.6 million shares of common
stock for all the outstanding common shares of Three Rivers. At the time of the
merger, Three Rivers was wholly-owned by affiliates of Apollo, which held
approximately 82.6% of our outstanding common stock.

    Ten members of our current and former management have agreed to indemnify us
for designated costs, fees and expenses incurred by us in connection with
possible errors in billing Medicare claims in Massachusetts as described in
"Business--Legal and Administration Proceedings."

    From January 1998 to December 31, 2000, we have granted options to our
directors and current executive officers, including the named executive officers
as follows:



NAME                                          NUMBER OF SHARES       GRANT DATE       EXERCISE PRICE
----                                          ----------------   ------------------   --------------
                                                                             
Richard N. Zehner...........................       25,000        February 6, 1998         $11.00

                                                  124,750        November 2, 1999          55.97

Jamie E. Hopping............................       70,000        November 27, 2000         55.97

Vincent S. Pino.............................       20,000        February 6, 1998          11.00

                                                  114,800        November 2, 1999          55.97

Kenneth S. Ord..............................       45,000        January 19, 1998          11.00

                                                   83,850        November 2, 1999          55.97

Cheryl A. Ford..............................       13,500        January 2, 1998           11.00

                                                   30,000        November 2, 1999          55.97

Terry A. Andrues............................       13,500        January 2, 1998           11.00

                                                   30,000        November 2, 1999          55.97

Jay A. Mericle..............................       13,500        January 2, 1998           11.00

                                                   30,000        November 2, 1999          55.97

Russell D. Phillips, Jr.....................        5,000        April 28, 1998            16.50

                                                    5,000        March 1, 1999             22.00

                                                    5,500        November 2, 1999          55.97

Howard K. Aihara............................        3,500        November 1, 2000          55.97


                                       56

                             PRINCIPAL STOCKHOLDERS

    The following table sets forth certain information regarding the beneficial
ownership of our common stock as of the date hereof, 2001 by each person or
group that we are aware owns 5% or more of our common stock, each of our named
executive officers and directors and our executive officers and directors as a
group.



                                                               COMMON STOCK
                                                                   OWNED        PERCENTAGE OF SHARES
NAME                                                          BENEFICIALLY(1)    BENEFICIALLY OWNED
----                                                          ---------------   --------------------
                                                                          
KKR 1996 GP L.L.C.(2).......................................     3,461,740          90.9%
Strata L.L.C.(3)............................................        52,717          1.4%
Apollo Capital Management II, Inc. related entities(4)......       272,257          7.2%
Richard N. Zehner(5)........................................       114,522          2.8%
Jamie E. Hopping............................................         5,360            *
Vincent S. Pino(6)..........................................        11,480            *
Kenneth S. Ord(7)...........................................        24,135            *
Cheryl A. Ford(8)...........................................        11,800            *
Terry A. Andrues(9).........................................        11,800            *
Jay A. Mericle(10)..........................................        11,800            *
Henry R. Kravis(2)(3).......................................     3,514,457          92.3%
Michael W. Michelson(2)(3)..................................     3,514,457          92.3%
George R. Roberts(2)(3).....................................     3,514,457          92.3%
David H.S. Chung(2)(3)......................................       --                --
All Present Executive Officers and Directors
  (12 persons)(11)..........................................     3,705,354          92.7%


------------------------

   * Less than 1%

(1)  Except as otherwise indicated, the persons named in the table have sole
     voting and investment power with respect to the shares of common stock
    shown as beneficially owned by them. Beneficial ownership as reported in the
    above table has been determined in accordance with Rule 13d-3 under the
    Securities Exchange Act of 1934, as amended. The percentages are based upon
    3,806,836 shares outstanding as of February 23, 2001, except for certain
    parties who hold options that are presently exercisable or exercisable
    within 60 days of February 23, 2001. The percentages for those parties who
    hold options that are presently exercisable or exercisable within 60 days of
    February 23, 2001 are based upon the sum of 3,806,836 shares outstanding
    plus the number of shares subject to options that are presently exercisable
    or exercisable within 60 days of February 23, 2001 held by them, as
    indicated in the following notes.

(2)  Shares of Common Stock shown as beneficially owned by KKR 1996 GP L.L.C.
     are held by Viewer Holdings L.L.C. KKR 1996 GP L.L.C. is the sole general
    partner of KKR Associates 1996 L.P., which is the sole general partner of
    KKR 1996 Fund L.P. As of the date hereof, KKR 1996 Fund L.P. is the senior
    member of Viewer Holdings L.L.C. KKR 1996 GP L.L.C. is a limited liability
    company, the managing members of which are Messrs. Henry R. Kravis and
    George R. Roberts, and the other members of which are Messrs. Paul E.
    Raether, Michael W. Michelson, James H. Greene, Jr., Michael T. Tokarz,
    Edward A. Gilhuly, Perry Golkin, Scott M. Stuart, Robert I. Macdonell,
    Johannes Huth, Todd A. Fisher, Alexander Navab and Neil A. Richardson.
    Messrs. Kravis, Roberts and Michelson are members of our board of directors.
    Each of such individuals may be deemed to share beneficial ownership of any
    shares beneficially owned by KKR 1996 GP L.L.C. Each of such individuals
    disclaims beneficial ownership. Mr. Chung is a member of our board of
    directors and is also an executive of KKR and a limited partner of KKR
    Associates 1996 L.P. Mr. Chung disclaims that he is the beneficial owner of
    any shares beneficially owned by KKR Associates 1996 L.P. The address of KKR
    1996 GP L.L.C. and Messrs. Henry R.

                                       57

    Kravis, Michael W. Michelson and George R. Roberts is: c/o Kohlberg Kravis
    Roberts & Co., 9 West 57 th Street, New York, NY 10019.

(3)  Shares of Common Stock shown as beneficially owned by Strata L.L.C. are
     held by Viewer Holdings L.L.C. Strata L.L.C. is the sole general partner of
    KKR Associates (Strata) L.P., which is a general partner of KKR Partners II
    L.P. As of the date hereof, KKR Partners II L.P. is a member of Viewer
    Holdings L.L.C. Strata L.L.C. is a limited liability company, the managing
    members of which are Messrs. Henry R. Kravis and George R. Roberts, and the
    other members of which are Messrs. Paul E. Raether, Michael W. Michelson,
    James H. Greene, Jr., Michael T. Tokarz, Edward A. Gilhuly, Perry Golkin,
    Scott M. Stuart and Robert I. Macdonell. Messrs. Kravis, Roberts and
    Michelson are members of our board of directors. Each of such individuals
    may be deemed to share beneficial ownership of any shares beneficially owned
    by Strata L.L.C. Each of such individuals disclaims beneficial ownership.
    Mr. Chung is a member of our board of directors and a limited partner of KKR
    Associated (Strata) L.P. Mr. Chung disclaims that he is the beneficial owner
    of any shares beneficially owned by Strata L.L.C.

(4)  This amount includes 248,244 shares owned by Apollo Investment Fund III,
     L.P., 14,838 shares owned by Apollo Overseas Partners III, L.P. and 9,175
    shares owned by Apollo (U.K) Partners III, L.P. Apollo Capital Management
    II, Inc., a Delaware Corporation, is the general partner of Apollo Advisor
    II L.P., a Delaware limited partnership, which is the general partner of
    Apollo Investment Fund III, L.P., and Apollo Overseas Partners III, L.P. and
    Apollo (U.K.) Partners III, L.P. The address of Apollo Capital Management
    II, Inc. related entities is: 1301 Avenue of the Americas, 38th Floor, New
    York, New York 10019.

(5)  This amount represents 114,522 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(6)  This amount represents 11,480 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(7)  This amount represents 24,135 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(8)  This amount represents 11,800 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(9)  This amount represents 11,800 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(10) This amount represents 11,800 shares issuable upon exercise of stock
     options that are currently exercisable or exercisable within 60 days.

(11) This amount includes 150,337 shares issuable upon exercise of stock options
     that are currently exercisable or exercisable within 60 days.

                                       58

                   DESCRIPTION OF CERTAIN OTHER INDEBTEDNESS

    THE FOLLOWING SUMMARY OF OUR CREDIT FACILITY DOES NOT PURPORT TO BE COMPLETE
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE AGREEMENTS DESCRIBED,
INCLUDING THE DEFINITIONS OF CERTAIN CAPITALIZED TERMS USED IN THIS SECTION,
COPIES OF WHICH ARE AVAILABLE UPON REQUEST. ANY TERMS NOT DEFINED IN THIS
SECTION ARE DEFINED IN THE DOCUMENTATION FOR OUR CREDIT FACILITY. SEE "AVAILABLE
INFORMATION."

CREDIT AGREEMENT

    GENERAL

    Pursuant to a credit agreement dated as of November 2, 1999, as amended,
among Alliance, Bankers Trust Company, as administrative agent, and certain
other lenders, we received commitments for up to $616 million in financing. The
credit facility consists of:

    - a $131 million seven-year Tranche A Term Loan facility;

    - a $150 million eight-year Tranche B Term Loan facility;

    - a $185 million nine-year Tranche C Term Loan facility; and

    - a $150 million seven-year Revolving Loan facility including a $10 million
      seven-year Swing Line facility.

    AMORTIZATION

    The following schedule of amortization for the term loans indicates: the
amounts to be paid at each installment for the Tranche A Term loan, Tranche B
Term loan and Tranche C Term loan, and the maturity date represented by the
number of years after the closing date upon which any principal amounts
remaining outstanding:



                                       TERM LOAN     TERM LOAN      TRANCHE C
DATE                                   TRANCHE A     TRANCHE B      TERM LOAN
----                                  -----------   ------------   ------------
                                                          
November 2, 2001....................  $ 5,000,000   $  1,500,000   $  1,850,000
November 2, 2002....................   10,000,000      1,500,000      1,850,000
November 2, 2003....................   23,000,000      1,500,000      1,850,000
November 2, 2004....................   25,000,000      1,500,000      1,850,000
November 2, 2005....................   32,000,000      1,500,000      1,850,000
November 2, 2006....................   36,000,000      1,500,000      1,850,000
November 2, 2007....................           --    141,000,000      1,850,000
November 2, 2008....................           --             --    172,050,000


    PREPAYMENTS

    Loans are required to be prepaid with:

    - 100% of the net proceeds of all non-ordinary course asset sales or other
      dispositions of the property by us and our subsidiaries which we have not
      reinvested in our business within one year after receipt of the proceeds,
      subject to limited exceptions;

    - 50% of annual excess cash flow; and

    - the amount by which the outstanding amounts under the revolving facility
      exceed the total amount committed under the revolving facility.

                                       59

    INTEREST

    The Tranche A Term loan and the revolving loan facilities will bear interest
through maturity: (1) if a Base Rate (as defined below) loan, then at the sum of
the Base Rate plus the Applicable Tranche A Base Rate Margin (as defined below),
or (2) if a LIBOR loan, then at the sum of LIBOR plus the Applicable Tranche A
LIBOR Margin (as defined below). The Swing Line Loan facility will bear interest
at the sum of the Base Rate plus the Applicable Tranche A Base Rate Margin minus
the Applicable Commitment Fee Percentage.

    The Base Rate is the higher of: (1) the administrative agent's prime rate or
(2) the rate which is 0.5% in excess of the Federal Funds Effective Rate
(defined as a fluctuating interest rate equal for each day during any period to
the weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers, as
published for such day by the Federal Reserve Bank of New York, or, if such rate
is not so published, the average of the quotations for such day on such
transactions received by the administrative agent from three Federal funds
brokers of recognized standing selected by the administrative agent).

    The Tranche B Term Loan and the Tranche C Term Loan will bear interest
through maturity: (1) if a Base Rate loan, then at the sum of the Base Rate plus
the Applicable Tranche B Base Rate Margin or the Applicable Tranche C Base Rate
Margin (as defined below), as applicable, or (2) if a LIBOR loan, then at the
sum of LIBOR plus the Applicable Tranche B LIBOR Margin or the Applicable
Tranche C LIBOR Margin (as defined below), as applicable.

    The Applicable Tranche A Base Rate Margin will range, based on the
Applicable Leverage Ratio, from 0.125% to 1.500%. The Applicable Tranche B Base
Rate Margin will range, based on the Applicable Leverage Ratio, from 1.500% to
2.000%. The Applicable Tranche C Base Rate Margin will range, based on the
Applicable Leverage Ratio, from 1.750% to 2.250%.

    The Applicable Tranche A LIBOR Margin will range, based on the Applicable
Leverage Ratio, from 1.375% to 2.750%. The Applicable Tranche B LIBOR Margin
will range, based on the Applicable Leverage Ratio, from 2.750% to 3.250%. The
Applicable Tranche C LIBOR Margin will range, based on the Applicable Leverage
Ratio, from 3.000% to 3.500%.

    COLLATERAL

    The loans under the credit agreement are secured by a lien on substantially
all of our tangible and intangible property, including accounts receivable,
inventory, equipment and intellectual property, and by a pledge of all of the
shares of stock, partnership interests and limited liability company interests
of our direct and indirect domestic subsidiaries, of which we now own or later
acquire more than a 50% interest, except for subsidiaries which own assets or
have annual revenues of less than $100,000 individually and $1,000,000
collectively.

    COVENANTS

    In addition to certain customary covenants, the credit agreement restricts,
among other things, our ability and our subsidiaries' ability to:

    - declare dividends or redeem or repurchase capital stock;

    - prepay, redeem or purchase debt;

    - incur liens and engage in sale-leaseback transactions;

    - make loans and investments;

    - incur additional indebtedness;

                                       60

    - amend or otherwise alter debt and other material agreements;

    - make capital expenditures;

    - engage in mergers, acquisitions and asset sales;

    - transact with affiliates; and

    - alter the business we conduct.

    FINANCIAL COVENANTS

    The credit facility contains financial covenants including a minimum ratio
of consolidated adjusted EBITDA to consolidated cash interest expense and a
maximum ratio of consolidated total debt to consolidated adjusted EBITDA.

    EVENTS OF DEFAULT

    Events of default under the credit agreement include:

    - our failure to pay principal or interest when due;

    - our material breach of any representation or warranty contained in the
      loan documents;

    - covenant defaults;

    - events of bankruptcy; and

    - a change of control.

                                       61

                               THE EXCHANGE OFFER

GENERAL

    As of the date of this prospectus, $260 million in principal amount of the
old notes is outstanding. This prospectus, together with the letter of
transmittal, is first being sent to holders on the date set forth at the bottom
of the cover page to this prospectus.

PURPOSE OF THE EXCHANGE OFFER

    We issued the old notes on April 10, 2001 in a transaction exempt from the
registration requirements of the Securities Act. Accordingly, the old notes may
not be reoffered, resold, or otherwise transferred unless so registered or
unless an applicable exemption from the registration and prospectus delivery
requirements of the Securities Act is available.

    In connection with the sale of the old notes, we entered into the
registration rights agreement, which requires us to:

    - file a registration statement with the Commission relating to the exchange
      offer not later than 120 days after the date of issuance of the old notes;

    - use our best efforts to cause the registration statement relating to the
      exchange offer to become effective under the Securities Act within
      200 days after the date of issuance of the old notes;

    - use our best efforts to complete the exchange offer within 230 days from
      the original issuance of the old notes; and

    - to file a shelf registration statement for the resale of the notes if we
      cannot effect an exchange offer within the time periods listed above and
      in certain other circumstances.

    We have filed a copy of the registration rights agreement as an exhibit to
the registration statement of which this prospectus is a part. We are making the
exchange offer to satisfy our obligations under the registration rights
agreement. Other than pursuant to the registration rights agreement, we are not
required to file any registration statement to register any outstanding old
notes. Holders of old notes who do not tender their old notes or whose old notes
are tendered but not accepted in the exchange offer must rely on an exemption
from the registration requirements under the securities laws, including the
Securities Act, if they wish to sell their old notes.

TERMS OF THE EXCHANGE

    We are offering to exchange, subject to the conditions described in this
prospectus and in the letter of transmittal accompanying this prospectus, $1,000
in principal amount of exchange notes for each $1,000 in principal amount of the
old notes. The terms of the exchange notes are identical in all material
respects to the terms of the old notes, except that the exchange notes will
generally be freely transferable by holders of the exchange notes and will not
be subject to the terms of the registration rights agreement. The exchange notes
will evidence the same indebtedness as the old notes and will be entitled to the
benefits of the indenture. For additional information, see "Description of the
Exchange Notes."

    The exchange offer is not conditioned upon the tender of any minimum
principal amount of old notes.

    We have not requested, and do not intend to request, an interpretation by
the staff of the Commission as to whether the exchange notes issued in exchange
for the old notes may be offered for sale, resold or otherwise transferred by
any holder without compliance with the registration and prospectus delivery
provisions of the Securities Act. Instead, based on an interpretation by the
staff of the Commission set forth in a series of no-action letters issued to
third parties, we believe that exchange notes issued in the exchange offer in
exchange for old notes may be offered for sale, resold

                                       62

and otherwise transferred by any holder of exchange notes, other than any holder
that is a broker-dealer or is an "affiliate" of ours within the meaning of
Rule 405 under the Securities Act, without compliance with the registration and
prospectus delivery provisions of the Securities Act, provided that:

    - the exchange notes are acquired in the ordinary course of the holder's
      business;

    - the holder has no arrangement or understanding with any person to
      participate in the distribution of the exchange notes; and

    - the holder is not engaged in, and does not intend to engage in a
      distribution of the exchange notes.

    Since the Commission has not considered the exchange offer in the context of
a no-action letter, we can provide no assurance that the staff of the Commission
would make a similar determination with respect to the exchange offer. Any
holder who is an affiliate of ours or who tenders old notes in the exchange
offer for the purpose of participating in a distribution of the exchange notes
cannot rely on the interpretation by the staff of the Commission and must comply
with the registration and prospectus delivery requirements of the Securities Act
in connection with any resale transaction. Each holder, other than a
broker-dealer, must acknowledge that it is not engaged in, and does not intend
to engage in, a distribution of exchange notes. Each broker-dealer that receives
exchange notes for its own account in exchange for old notes, where the
broker-dealer acquired the old notes as a result of market-making activities or
other trading activities, must acknowledge that it will deliver a prospectus in
connection with any resale of the exchange notes. For additional information,
see "Plan of Distribution."

    The exchange notes will accrue interest from the date of issuance of the old
notes, which was on April 10, 2001. Holders whose old notes are accepted for
exchange will be deemed to have waived the right to receive any interest accrued
on the old notes.

    Tendering holders of the old notes will not be required to pay brokerage
commissions or fees or, transfer taxes, except as specified in the instructions
in the letter of transmittal, with respect to the exchange of the old notes in
the exchange offer.

EXPIRATION DATE; EXTENSION; TERMINATION; AMENDMENT

    The exchange offer will expire at 5:00 p.m., New York City time, on
July 30, 2001, unless we, in our sole discretion, have extended the period of
time for which the exchange offer is open. The time and date, as it may be
extended, is referred to herein as the "expiration date." The expiration date
will be at least 20 business days after the commencement of the exchange offer
in accordance with Rule 14e-1(a) under the Exchange Act. We expressly reserve
the right, at any time or from time to time, to extend the period of time during
which the exchange offer is open, and thereby delay acceptance for exchange of
any old notes. We will extend the expiration date by giving oral or written
notice of the extension to the exchange agent and by timely public announcement
no later than 9:00 a.m., New York City time, on the next business day after the
previously scheduled expiration date. During the extension, all old notes
previously tendered will remain subject to the exchange offer unless properly
withdrawn.

    We expressly reserve the right to:

    - terminate or amend the exchange offer and not to accept for exchange any
      old notes not previously accepted for exchange upon the occurrence of any
      of the events specified below under "--Conditions to the Exchange Offer"
      below which have not been waived by us; and

    - amend the terms of the exchange offer in any manner which, in our good
      faith judgment, is advantageous to the holders of the old notes, whether
      before or after any tender of the old notes.

                                       63

    If any termination or amendment occurs, we will notify the exchange agent
and will either issue a press release or give oral or written notice to the
holders of the old notes as promptly as practicable.

    For purposes of the exchange offer, a "business day" means any day other
than Saturday, Sunday or a date on which banking institutions are required or
authorized by New York State law to be closed, and consists of the time period
from 12:01 a.m. through 12:00 midnight, New York City time. Unless we terminate
the exchange offer prior to 5:00 p.m., New York City time, on the expiration
date, we will exchange the exchange notes for the old notes promptly following
the expiration date.

PROCEDURES FOR TENDERING OLD NOTES

    Our acceptance of old notes tendered by a holder will constitute a binding
agreement between the tendering holder and us upon the terms and subject to the
conditions described in this prospectus and in the accompanying letter of
transmittal. All references in this prospectus to the letter of transmittal are
deemed to include a facsimile of the letter of transmittal.

    A holder of old notes may tender the old notes by:

    - properly completing and signing the letter of transmittal;

    - properly completing any required signature guarantees;

    - properly completing any other documents required by the letter of
      transmittal; and

    - delivering all of the above, together with the certificate or certificates
      representing the old notes being tendered, to the exchange agent at its
      address set forth below on or prior to the expiration date; or

    - complying with the procedure for book-entry transfer described below; or

    - complying with the guaranteed delivery procedures described below.

    The method of delivery of old notes, letters of transmittal and all other
required documents is at the election and risk of the holders. If the delivery
is by mail, it is recommended that registered mail properly insured, with return
receipt requested, be used. In all cases, sufficient time should be allowed to
ensure timely delivery. Holders should not send old notes or letters of
transmittal to us.

    The signature on the letter of transmittal need not be guaranteed if:

    - tendered old notes are registered in the name of the signer of the letter
      of transmittal; and

    - the exchange notes to be issued in exchange for the old notes are to be
      issued in the name of the holder; and

    - any untendered old notes are to be reissued in the name of the holder.

    In any other case, the tendered old notes must be:

    - endorsed or accompanied by written instruments of transfer in form
      satisfactory to us;

    - duly executed by the holder; and

    - the signature on the endorsement or instrument of transfer must be
      guaranteed by a bank, broker, dealer, credit union, savings association,
      clearing agency or other institution, each an "eligible institution" that
      is a member of a recognized signature guarantee medallion program within
      the meaning of Rule 17Ad-15 under the Exchange Act.

    If the exchange notes and/or old notes not exchanged are to be delivered to
an address other than that of the registered holder appearing on the note
register for the old notes, the signature in the letter of transmittal must be
guaranteed by an eligible institution.

    The exchange agent will make a request within two business days after the
date of receipt of this prospectus to establish accounts with respect to the old
notes at The Depository Trust Company, the

                                       64

"book-entry transfer facility," for the purpose of facilitating the exchange
offer. We refer to the Depository Trust Company in this prospectus as "DTC."
Subject to establishing the accounts, any financial institution that is a
participant in the book-entry transfer facility's system may make book-entry
delivery of old notes by causing the book-entry transfer facility to transfer
the old notes into the exchange agent's account with respect to the old notes in
accordance with the book-entry transfer facility's procedures for the transfer.
Although delivery of old notes may be effected through book-entry transfer into
the exchange agent's account at the book-entry transfer facility, an appropriate
letter of transmittal with any required signature guarantee and all other
required documents, or an agent's message, must in each case be properly
transmitted to and received or confirmed by the exchange agent at its address
set forth below prior to the expiration date, or, if the guaranteed delivery
procedures described below are complied with, within the time period provided
under such procedures.

    The exchange agent and DTC have confirmed that the exchange offer is
eligible for the DTC Automated Tender Offer Program. We refer to the Automated
Tender Offer Program in this prospectus as "ATOP." Accordingly, DTC participants
may, in lieu of physically completing and signing the letter of transmittal and
delivering it to the exchange agent, electronically transmit their acceptance of
the exchange offer by causing DTC to transfer old notes to the exchange agent in
accordance with DTC's ATOP procedures for transfer. DTC will then send an
agent's message.

    The term "agent's message" means a message which:

    - is transmitted by DTC;

    - received by the exchange agent and forming part of the book-entry
      transfer;

    - states that DTC has received an express acknowledgment from a participant
      in DTC that is tendering old notes which are the subject of the book-entry
      transfer;

    - states that the participant has received and agrees to be bound by all of
      the terms of the letter of transmittal; and

    - states that we may enforce the agreement against the participant.

    If a holder desires to accept the exchange offer and time will not permit a
letter of transmittal or old notes to reach the exchange agent before the
expiration date or the procedure for book-entry transfer cannot be completed on
a timely basis, the holder may effect a tender if the exchange agent has
received at its address set forth below on or prior to the expiration date, a
letter, telegram or facsimile transmission, and an original delivered by
guaranteed overnight courier, from an eligible institution setting forth:

    - the name and address of the tendering holder;

    - the names in which the old notes are registered and, if possible, the
      certificate numbers of the old notes to be tendered; and

    - a statement that the tender is being made thereby and guaranteeing that
      within three business days after the expiration date, the old notes in
      proper form for transfer, or a confirmation of book-entry transfer of such
      old notes into the exchange agent's account at the book-entry transfer
      facility and an agent's message, will be delivered by the eligible
      institution together with a properly completed and duly executed letter of
      transmittal and any other required documents.

    Unless old notes being tendered by the above-described method are deposited
with the exchange agent, a tender will be deemed to have been received as of the
date when:

    - the tendering holder's properly completed and duly signed letter of
      transmittal, or a properly transmitted agent's message, accompanied by the
      old notes or a confirmation of book-entry transfer of the old notes into
      the exchange agent's account at the book-entry transfer facility is
      received by the exchange agent; or

                                       65

    - a notice of guaranteed delivery or letter, telegram or facsimile
      transmission to similar effect from an eligible institution is received by
      the exchange agent.

    Issuances of exchange notes in exchange for old notes tendered pursuant to a
notice of guaranteed delivery or letter, telegram or facsimile transmission to
similar effect by an eligible institution will be made only against deposit of
the letter of transmittal and any other required documents and the tendered old
notes or a confirmation of book-entry and an agent's message.

    All questions as to the validity, form, eligibility, including time of
receipt, and acceptance of old notes tendered for exchange will be determined by
us in our sole discretion, which determination will be final and binding. We
reserve the absolute right to reject any and all tenders of any old notes not
properly tendered or not to accept any old notes which acceptance might, in our
judgment or the judgment of our counsel, be unlawful. We also reserve the
absolute right to waive any defects or irregularities or conditions of the
exchange offer as to any old notes either before or after the expiration date,
including the right to waive the ineligibility of any holder who seeks to tender
old notes in the exchange offer. The interpretation of the terms and conditions
of the exchange offer including the letter of transmittal and the instructions
contained in the letter of transmittal, by us will be final and binding on all
parties. Unless waived, any defects or irregularities in connection with tenders
of old notes for exchange must be cured within such reasonable period of time as
we determine. Neither we, the exchange agent nor any other person has any duty
to give notification of any defect or irregularity with respect to any tender of
old notes for exchange, nor will any of us incur any liability for failure to
give such notification.

    If the letter of transmittal is signed by a person or persons other than the
registered holder or holders of old notes, the old notes must be endorsed or
accompanied by appropriate powers of attorney, in either case signed exactly as
the name or names of the registered holder or holders appear on the old notes.

    If the letter of transmittal or any old notes or powers of attorney are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and, unless waived by
us, such persons must submit proper evidence satisfactory to us of their
authority to so act.

    By tendering, each holder represents to us that, among other things:

    - the exchange notes acquired pursuant to the exchange offer are being
      acquired in the ordinary course of business of the holder;

    - the holder is not participating, does not intend to participate, and has
      no arrangement or understanding with any person to participate, in the
      distribution of the exchange notes; and

    - the holder is not an "affiliate," as defined under Rule 405 of the
      Securities Act, of ours.

    Each broker-dealer that receives exchange notes for its own account in
exchange for old notes, where the broker-dealer acquired the old notes as a
result of market-making activities or other trading activities, must acknowledge
that it will deliver a prospectus in connection with any resale of the exchange
notes. For additional information, see "Plan of Distribution."

TERMS AND CONDITIONS OF THE LETTER OF TRANSMITTAL

    The letter of transmittal contains, among other things, the following terms
and conditions, which are part of the exchange offer.

    The party tendering old notes for exchange exchanges, assigns and transfers
the old notes to us and irrevocably constitutes and appoints the exchange agent
as his agent and attorney-in-fact to cause the old notes to be assigned,
transferred and exchanged. We refer to the party tendering notes herein as the
"transferor." The transferor represents and warrants that it has full power and
authority to

                                       66

tender, exchange, assign and transfer the old notes and to acquire exchange
notes issuable upon the exchange of the tendered old notes, and that, when the
same are accepted for exchange, we will acquire good and unencumbered title to
the tendered old notes, free and clear of all liens, restrictions, charges and
encumbrances and not subject to any adverse claim. The transferor also warrants
that it will, upon request, execute and deliver any additional documents deemed
by the exchange agent or us to be necessary or desirable to complete the
exchange, assignment and transfer of tendered old notes or transfer ownership of
such old notes on the account books maintained by a book-entry transfer
facility. The transferor further agrees that acceptance of any tendered old
notes by us and the issuance of exchange notes in exchange for old notes will
constitute performance in full by us of various of our obligations under the
registration rights agreement. All authority conferred by the transferor will
survive the death or incapacity of the transferor and every obligation of the
transferor will be binding upon the heirs, legal representatives, successors,
assigns, executors and administrators of the transferor.

    The transferor certifies that it is not an "affiliate" of ours within the
meaning of Rule 405 under the Securities Act and that it is acquiring the
exchange notes offered hereby in the ordinary course of the transferor's
business and that the transferor has no arrangement with any person to
participate in the distribution of the exchange notes.

    Each holder, other than a broker-dealer, must acknowledge that it is not
engaged in, and does not intend to engage in, a distribution of exchange notes.
Each transferor which is a broker-dealer receiving exchange notes for its own
account must acknowledge that it will deliver a prospectus in connection with
any resale of the exchange notes. By so acknowledging and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

WITHDRAWAL RIGHTS

    Tenders of old notes may be withdrawn at any time prior to the expiration
date.

    For a withdrawal to be effective, a written notice of withdrawal sent by
telegram, facsimile transmission, with receipt confirmed by telephone, or letter
must be received by the exchange agent at the address set forth in this
prospectus prior to the expiration date. Any notice of withdrawal must:

    - specify the name of the person having tendered the old notes to be
      withdrawn;

    - identify the old notes to be withdrawn, including the certificate number
      or numbers and principal amount of such old notes;

    - specify the principal amount of old notes to be withdrawn;

    - include a statement that the holder is withdrawing his election to have
      the old notes exchanged;

    - be signed by the holder in the same manner as the original signature on
      the letter of transmittal by which the old notes were tendered or as
      otherwise described above, including any required signature guarantees, or
      be accompanied by documents of transfer sufficient to have the trustee
      under the indenture register the transfer of the old notes into the name
      of the person withdrawing the tender; and

    - specify the name in which any such old notes are to be registered, if
      different from that of the person who tendered the old notes.

    The exchange agent will return the properly withdrawn old notes promptly
following receipt of the notice of withdrawal. If old notes have been tendered
pursuant to the procedure for book-entry transfer, any notice of withdrawal must
specify the name and number of the account at the book-entry transfer facility
to be credited with the withdrawn old notes or otherwise comply with the
book-entry transfer facility procedure. All questions as to the validity of
notices of withdrawals, including time of receipt, will be determined by us and
our determination will be final and binding on all parties.

                                       67

    Any old notes so withdrawn will be deemed not to have been validly tendered
for exchange for purposes of the exchange offer. Any old notes which have been
tendered for exchange but which are not exchanged for any reason will be
returned to the holder without cost to the holder. In the case of old notes
tendered by book-entry transfer into the exchange agent's account at the
book-entry transfer facility pursuant to the book-entry transfer procedures
described above, the old notes will be credited to an account with the
book-entry transfer facility specified by the holder. In either case, the old
notes will be returned as soon as practicable after withdrawal, rejection of
tender or termination of the exchange offer. Properly withdrawn old notes may be
retendered by following one of the procedures described under "Procedures for
Tendering Old Notes" above at any time prior to the expiration date.

ACCEPTANCE OF OLD NOTES FOR EXCHANGE; DELIVERY OF EXCHANGE NOTES

    Upon satisfaction or waiver of all of the conditions to the exchange offer,
we will accept, on the expiration date, all old notes properly tendered and will
issue the exchange notes promptly after such acceptance. See "--Conditions to
the Exchange Offer" below for more detailed information. For purposes of the
exchange offer, we will be deemed to have accepted properly tendered old notes
for exchange when, and if, we have given oral or written notice of our
acceptance to the exchange agent.

    For each old note accepted for exchange, the holder of the old note will
receive an exchange note having a principal amount equal to that of the
surrendered old note.

    In all cases, issuance of exchange notes for old notes that are accepted for
exchange pursuant to the exchange offer will be made only after:

    - timely receipt by the exchange agent of certificates for the old notes or
      a timely book-entry confirmation of the old notes into the exchange
      agent's account at the book-entry transfer facility;

    - a properly completed and duly executed letter of transmittal, or a
      properly transmitted agent's message; and

    - timely receipt by the exchange agent of all other required documents.

    If any tendered old notes are not accepted for any reason described in the
terms and conditions of the exchange offer or if old notes are submitted for a
greater principal amount than the holder desires to exchange, the unaccepted or
nonexchanged old notes will be returned without expense to the tendering holder
of the old notes. In the case of old notes tendered by book-entry transfer into
the exchange agent's account at the book-entry transfer facility pursuant to the
book-entry transfer procedures described above, the non-exchanged old notes will
be credited to an account maintained with the book-entry transfer facility. In
either case, the old notes will be returned as promptly as practicable after the
expiration of the exchange offer.

CONDITIONS TO THE EXCHANGE OFFER

    Notwithstanding any other provision of the exchange offer, or any extension
of the exchange offer, we will not be required to accept for exchange, or to
issue exchange notes in exchange for, any old notes and may terminate or amend
the exchange offer, by oral or written notice to the exchange agent or by a
timely press release, if at any time before the acceptance of the old notes for
exchange or the exchange of the exchange notes for such old notes, any of the
following conditions exist:

    - any action or proceeding is instituted or threatened in any court or by or
      before any governmental agency with respect to the exchange offer which,
      in our judgment would reasonably be expected to impair our ability to
      proceed with the exchange offer; or

    - the exchange offer, or the making of any exchange by a holder, violates
      applicable law or any applicable interpretation of the staff of the
      Commission.

                                       68

    Regardless of whether any of the conditions has occurred, we may amend the
exchange offer in any manner which, in our good faith judgment, is advantageous
to holders of the old notes.

    The conditions described above are for our sole benefit and may be asserted
by us regardless of the circumstances giving rise to the condition or we may
waive any condition in whole or in part at any time and from time to time in our
sole discretion. Our failure at any time to exercise any of the rights described
above will not be deemed a waiver of the right and each right will be deemed an
ongoing right which we may assert at any time and from time to time.

    If we waive or amend the conditions above, we will, if required by law,
extend the exchange offer for a minimum of five business days from the date that
we first give notice, by public announcement or otherwise, of the waiver or
amendment, if the exchange offer would otherwise expire within the five
business-day period. Any determination by us concerning the events described
above will be final and binding upon all parties.

    The exchange offer is not conditioned upon any minimum principal amount of
old notes being tendered.

EXCHANGE AGENT

    The Bank of New York has been appointed as the exchange agent for the
exchange offer. All executed letters of transmittal should be directed to the
exchange agent at one of the addresses set forth below:




                                                                        
  BY REGISTERED OR CERTIFIED MAIL:                BY FACSIMILE:                  BY HAND OR OVERNIGHT COURIER:
        The Bank of New York                      (212) 815-6339                      The Bank of New York
        Reorganization Unit                    Attn: Diane Amoroso              101 Barclay Street, Ground Floor
       101 Barclay Street-7E                Reorganization Department           Corporate Trust Services Window
      New York, New York 10286                                                      New York, New York 10286
        Attn: Diane Amoroso                   CONFIRM BY TELEPHONE:                   Attn: Diane Amoroso
                                                  Diane Amoroso                    Reorganization Department
                                                  (212) 815-3738


    You should direct questions and requests for assistance, requests for
additional copies of this prospectus or of the letter of transmittal and
requests for notices of guaranteed delivery to the exchange agent at the address
and telephone number set forth in the letter of transmittal.

    DELIVERY TO AN ADDRESS OTHER THAN AS SET FORTH ON THE LETTER OF TRANSMITTAL,
OR TRANSMISSIONS OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE SET
FORTH ON THE LETTER OF TRANSMITTAL, WILL NOT CONSTITUTE A VALID DELIVERY.

SOLICITATIONS OF TENDERS; FEES AND EXPENSES

    We have not retained any dealer-manager in connection with the exchange
offer and will not make any payments to brokers, dealers or others soliciting
acceptances of the exchange offer. However, we will pay the exchange agent
reasonable and customary fees for its services and will reimburse it for its
reasonable out-of-pocket expenses in connection therewith. We will also pay
brokerage houses and other custodians, nominees and fiduciaries the reasonable
out-of-pocket expenses incurred by them in forwarding copies of this and other
related documents to the beneficial owners of the old notes and in handling or
forwarding tenders for their customers.

    We will pay the estimated cash expenses to be incurred in connection with
the exchange offer. We estimate the expenses to be approximately $300,000, which
includes fees and expenses of the exchange agent, trustee, registration fees,
accounting, legal, printing and related fees and expenses.

    No person has been authorized to give any information or to make any
representations in connection with the exchange offer other than those contained
in this prospectus. If given or made,

                                       69

such information or representations should not be relied upon as having been
authorized by us. Neither the delivery of this prospectus nor any exchange made
pursuant to this prospectus, under any circumstances, create any implication
that there has been no change in our affairs since the respective dates as of
which information is given in this prospectus. The exchange offer is not being
made to, nor will tenders be accepted from or on behalf of, holders of old notes
in any jurisdiction in which the making of the exchange offer or the acceptance
of the exchange offer would not be in compliance with the laws of the
jurisdiction. However, we may, at our discretion, take such action as we may
deem necessary to make the exchange offer in the jurisdiction and extend the
exchange offer to holders of old notes in the jurisdiction. In any jurisdiction
in which the securities laws or blue sky laws of which require the exchange
offer to be made by a licensed broker or dealer, the exchange offer is being
made on our behalf by one or more registered brokers or dealers which are
licensed under the laws of the jurisdiction.

TRANSFER TAXES

    We will pay all transfer taxes, if any, applicable to the exchange of old
notes pursuant to the exchange offer. However, the transfer taxes will be
payable by the tendering holder if:

    - certificates representing exchange notes or old notes for principal
      amounts not tendered or accepted for exchange are to be delivered to, or
      are to be issued in the name of, any person other than the registered
      holder of the old notes tendered; or

    - tendered old notes are registered in the name of any person other than the
      person signing the letter of transmittal; or

    - a transfer tax is imposed for any reason other than the exchange of old
      notes pursuant to the exchange offer.

    We will bill the amount of the transfer taxes directly to the tendering
holder if satisfactory evidence of payment of the taxes or exemption therefrom
is not submitted with the letter of transmittal.

ACCOUNTING TREATMENT

    For accounting purposes, we will not recognize gain or loss upon the
exchange of the exchange notes for old notes. We will amortize expenses incurred
in connection with the issuance of the exchange notes over the term of the
exchange notes.

CONSEQUENCE OF FAILURE TO EXCHANGE

    Holders of old notes who do not exchange their old notes for exchange notes
pursuant to the exchange offer will continue to be subject to the restrictions
on transfer of the old notes as described in the legend on the old notes. Old
notes not exchanged pursuant to the exchange offer will continue to remain
outstanding in accordance with their terms. In general, the old notes may not be
offered or sold unless registered under the Securities Act, except pursuant to
an exemption from, or in a transaction not subject to, the Securities Act and
applicable state securities laws. We do not currently anticipate that we will
register the old notes under the Securities Act.

    Participation in the exchange offer is voluntary, and holders of old notes
should carefully consider whether to participate. Holders of old notes are urged
to consult their financial and tax advisors in making their own decision on what
action to take.

    As a result of the making of, and upon acceptance for exchange of all
validly tendered old notes pursuant to the terms of, this exchange offer, we
will have fulfilled a covenant contained in the registration rights agreement.
Holders of old notes who do not tender their old notes in the exchange offer
will continue to hold the old notes and will be entitled to all the rights and
limitations applicable to the old notes under the indenture, except for any
rights under the registration rights agreement that

                                       70

by their terms terminate or cease to have further effectiveness as a result of
the making of this exchange offer. All untendered old notes will continue to be
subject to the restrictions on transfer described in the indenture. To the
extent that old notes are tendered and accepted in the exchange offer, the
trading market for untendered old notes could be adversely affected.

    We may in the future seek to acquire, subject to the terms of the indenture,
untendered old notes in open market or privately negotiated transactions,
through subsequent exchange offers or otherwise. We have no present plan to
acquire any old notes which are not tendered in the exchange offer.

RESALE OF EXCHANGE NOTES

    We are making the exchange offer in reliance on the position of the staff of
the Commission as set forth in interpretive letters addressed to third parties
in other transactions. However, we have not sought our own interpretive letter
and we can provide no assurance that the staff would make a similar
determination with respect to the exchange offer as it has in such interpretive
letters to third parties. Based on these interpretations by the staff, we
believe that the exchange notes issued pursuant to the exchange offer in
exchange for old notes may be offered for resale, resold and otherwise
transferred by a holder, other than any holder who is a broker-dealer or an
"affiliate" of ours within the meaning of Rule 405 of the Securities Act,
without further compliance with the registration and prospectus delivery
requirements of the Securities Act, provided that:

    - the exchange notes are acquired in the ordinary course of the holder's
      business; and

    - the holder is not participating, and has no arrangement or understanding
      with any person to participate, in a distribution of the exchange notes.

    However, any holder who is:

    - an "affiliate" of ours;

    - who has an arrangement or understanding with respect to the distribution
      of the exchange notes to be acquired pursuant to the exchange offer; or

    - any broker-dealer who purchased old notes from us to resell pursuant to
      Rule 144A or any other available exemption under the Securities Act,

could not rely on the applicable interpretations of the staff and must comply
with the registration and prospectus delivery requirements of the Securities
Act. A broker-dealer who holds old notes that were acquired for its own account
as a result of market-making or other trading activities may be deemed to be an
"underwriter" within the meaning of the Securities Act and must, therefore,
deliver a prospectus meeting the requirements of the Securities Act in
connection with any resale of exchange notes. Each such broker-dealer that
receives exchange notes for its own account in exchange for old notes, where the
broker-dealer acquired the old notes as a result of market-making activities or
other trading activities, must acknowledge, as provided in the letter of
transmittal, that it will deliver a prospectus in connection with any resale of
such exchange notes. For more detailed information, see "Plan of Distribution."

    In addition, to comply with the securities laws of various jurisdictions, if
applicable, the exchange notes may not be offered or sold unless they have been
registered or qualified for sale in the jurisdiction or an exemption from
registration or qualification is available and is complied with. We have agreed,
pursuant to the registration rights agreement and subject to specified
limitations therein, to register or qualify the exchange notes for offer or sale
under the securities or blue sky laws of the jurisdictions as any holder of the
exchange notes reasonably requests. The registration or qualification may
require the imposition of restrictions or conditions, including suitability
requirements for offerees or purchasers, in connection with the offer or sale of
any exchange notes.

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SHELF REGISTRATION STATEMENT; LIQUIDATED DAMAGES

    If:

    - the exchange offer is not permitted by applicable law or applicable
      interpretation of the staff of the Commission;

    - any holder of old notes, other than a holder who has received the notes
      pursuant to a Rule 144 sale, notifies us between 30 and 50 days after the
      date that the exchange offer registration statement is declared effective
      that any of the following apply:

       - such holder was prohibited by law or Commission policy from
         participating in the exchange offer;

       - such holder is unable to resell the exchange notes to the public
         without delivering a prospectus and the prospectus in the exchange
         offer registration statement is not available;

       - such holder is a broker-dealer under the Securities Exchange Act of
         1934 and holds outstanding notes acquired directly from us or any of
         our affiliates,

we will use our best efforts to cause the Commission to declare effective a
shelf registration statement with respect to the resale of the old notes and
keep the statement effective for up to two years after the effective date of the
shelf registration statement or such shorter period, which shall terminate when
all the old notes covered by the registration statement have been sold pursuant
to the registration statement.

    If we fail to comply with specified obligations under the registration
rights agreement, we will be required to pay additional interest to holders of
the outstanding notes. Please see "Description of the Exchange
Notes--Registration Rights; Liquidated Damages" for more details regarding the
registration rights agreement.

                                       72

                       DESCRIPTION OF THE EXCHANGE NOTES

    You can find the definitions of certain terms used in this description under
the subheading "--Certain Definitions." In this description, the word "Alliance"
refers only to Alliance Imaging, Inc. and not to any of its subsidiaries, and
the word "notes" refers to both the old notes and the exchange notes.

    Alliance issued the old notes, and will issue the exchange notes, under an
indenture between Alliance and The Bank of New York, as trustee. The terms of
the exchange notes include those stated in the indenture and those made part of
the indenture by reference to the Trust Indenture Act of 1939.

    The following description is a summary of the material provisions of the
indenture. It does not restate that agreement in its entirety. We urge you to
read the indenture because it, and not this description, define your rights as
holders of the exchange notes. We have filed a copy of the indenture as an
exhibit to the registration statement which includes this prospectus. Certain
defined terms used in this description but not defined below under "--Certain
Definitions" have the meanings assigned to them in the indenture.

    The registered Holder of a note will be treated as the owner of it for all
purposes. Only registered Holders will have rights under the indenture.

BRIEF DESCRIPTION OF THE NOTES

    The notes:

    - are general obligations of Alliance;

    - are subordinated in right of payment to all existing and future Senior
      Indebtedness of Alliance, including our bank debt;

    - are effectively subordinated to all obligations of our subsidiaries;

    - are PARI PASSU in right of payment with any future senior subordinated
      Indebtedness of Alliance; and

    - are senior in right of payment to any future subordinated Indebtedness of
      Alliance.

    As of June 13, 2001, Alliance had total Senior Indebtedness of approximately
$509 million and additional borrowing availability of approximately $125 million
which would be senior to the notes. As indicated above and as discussed in
detail below under the caption "--Subordination," payments on the notes will be
subordinated to the payment of Senior Indebtedness. The indenture will permit us
to incur additional Senior Indebtedness.

    A portion of the operations of Alliance is conducted through its
subsidiaries and, therefore, Alliance depends partially on the cash flow of its
subsidiaries to meet its obligations, including its obligations under the notes.
The notes will be effectively subordinated in right of payment to all
Indebtedness and other liabilities and commitments (including trade payables and
lease obligations) of Alliance's subsidiaries. Any right of Alliance to receive
assets of any of its subsidiaries upon the subsidiary's liquidation or
reorganization (and the consequent right of the holders of the notes to
participate in those assets) will be effectively subordinated to the claims of
that subsidiary's creditors, except to the extent that Alliance is itself
recognized as a creditor of the subsidiary, in which case the claims of Alliance
would still be subordinate in right of payment to any security in the assets of
the subsidiary and any indebtedness of the subsidiary senior to that held by
Alliance. See "Risk Factors--Risks Related to Our Indebtedness" and "--Risks
Related to this Offering."

                                       73

PRINCIPAL, MATURITY AND INTEREST

    The notes are limited to a maximum aggregate principal amount of $260
million. Alliance will issue notes in denominations of $1,000 and integral
multiples of $1,000. The notes will mature on April 15, 2011.

    Interest on the notes will accrue at the rate of 10 3/8% per annum and will
be payable semi-annually in arrears on April 15 and October 15, commencing on
October 15, 2001. Alliance will make each interest payment to the Holders of
record on the immediately preceding April 1 and October 1.

    Interest on the notes will accrue from the date of original issuance or, if
interest has already been paid, from the date it was most recently paid.
Interest will be computed on the basis of a 360-day year comprised of twelve
30-day months.

METHODS OF RECEIVING PAYMENTS ON THE NOTES

    If a Holder has given wire transfer instructions to Alliance, Alliance will
pay all principal, interest and premium, if any, on that Holder's notes in
accordance with those instructions. All other payments on notes will be made at
the office or agency of the paying agent and registrar within the City and State
of New York unless Alliance elects to make interest payments by check mailed to
the Holders at their address set forth in the register of Holders.

PAYING AGENT AND REGISTRAR FOR THE NOTES

    The trustee will initially act as paying agent and registrar. Alliance may
change the paying agent or registrar without prior notice to the Holders of the
notes, and Alliance or any of its Subsidiaries may act as paying agent or
registrar.

TRANSFER AND EXCHANGE

    A Holder may transfer or exchange notes in accordance with the indenture.
The registrar and the trustee may require a Holder to furnish appropriate
endorsements and transfer documents in connection with a transfer of notes.
Holders will be required to pay all taxes due on transfer. Alliance is not
required to transfer or exchange any note selected for redemption. Also,
Alliance is not required to transfer or exchange any note for a period of 15
days before a selection of notes to be redeemed.

SUBORDINATION

    The payment of principal, interest and premium, if any, on the notes will be
subordinated to the prior payment in full of all Senior Indebtedness of
Alliance, including Senior Indebtedness incurred after the date of the
indenture.

    Upon any distribution to creditors of Alliance:

        (1) in a liquidation or dissolution of Alliance;

        (2) in a bankruptcy, reorganization, insolvency, receivership or similar
    proceeding relating to Alliance or its property;

        (3) in an assignment for the benefit of creditors; or

        (4) in any marshalling of Alliance's assets and liabilities:

           (a) the holders of Senior Indebtedness will be entitled to receive
       payment in full of the Senior Indebtedness before the Holders of notes
       will be entitled to receive any payment on the notes; and

                                       74

           (b) until all Senior Indebtedness is paid in full, any distribution
       to which the Holders of notes would be entitled will be made to the
       holders of Senior Indebtedness (except that Holders of notes may receive
       (a) shares of stock and any debt securities that are subordinated at
       least to the same extent as the notes to (1) Senior Indebtedness and (2)
       any securities issued in exchange for Senior Indebtedness and (b)
       payments made from the trusts described under "--Legal Defeasance and
       Covenant Defeasance").

    Alliance also may not make any payment upon or in respect of the notes
(except in subordinated securities described in clause (b) above or from the
trust described under "--Legal Defeasance and Covenant Defeasance") if:

        (1) a payment default on Designated Senior Indebtedness occurs and is
    continuing beyond any applicable grace period; or

        (2) any other default occurs and is continuing on any series of
    Designated Senior Indebtedness that permits holders of that series of
    Designated Senior Indebtedness to accelerate its maturity and the trustee
    receives a notice of such default (a "PAYMENT BLOCKAGE NOTICE") from holders
    of such Designated Senior Indebtedness.

    Payments on the notes may and will be resumed:

        (1) in the case of a payment default, upon the date on which such
    default is cured or waived; and

        (2) in the case of a nonpayment default, upon the earlier of (i) the
    date on which such nonpayment default is cured or waived, (ii) 179 days
    after the date on which the applicable Payment Blockage Notice is received
    (the "PAYMENT BLOCKAGE PERIOD"), or (iii) the date the Payment Blockage
    Period is terminated by written notice to the trustee from the holders of
    Designated Senior Indebtedness required to terminate such period.

    No new period of payment blockage may be commenced unless and until 365 days
have elapsed since the effectiveness of the immediately preceding Payment
Blockage Notice. However, if any Payment Blockage Notice within the 365-day
period is given by any holders of Designated Senior Indebtedness (other than the
agent under the Credit Facility), the agent under the Credit Facility may give
another Payment Blockage Notice within that period. The total number of days
during which any Payment Blockage Period or Periods is in effect may not exceed
179 days in the aggregate during any 365 consecutive day period.

    No nonpayment default that existed or was continuing on the date of delivery
of any Payment Blockage Notice to the trustee will be, or be made, the basis for
a subsequent Payment Blockage Notice unless the default has been cured or waived
for a period of not less than 90 days.

    If Alliance fails to make any payment on the notes when due or within any
applicable grace period, whether or not on account of the payment blockage
provisions referred to above, such failure would constitute an event of default
under the indenture and would enable the Holders of the notes to accelerate the
maturity of the notes. Alliance will be required to promptly notify holders of
Senior Indebtedness if payment of the notes is accelerated because of an event
of default under the indenture.

    As a result of the subordination provisions described above, in the event of
insolvency, bankruptcy, administration, reorganization, receivership or similar
proceedings relating to Alliance, Holders of notes may recover less ratably than
creditors of Alliance who are holders of Senior Indebtedness. As of June 13,
2001, Alliance had total Senior Indebtedness of approximately $509 million and
additional borrowing availability of approximately $125 million which would be
senior to the notes.

    In addition, the notes are structurally subordinated to the liabilities and
trade payables and obligations of subsidiaries of Alliance. Although the
indenture contains limitations on the amount of

                                       75

additional Indebtedness that Alliance and its subsidiaries may incur, under
certain circumstances the amount of such Indebtedness could be substantial and,
in any case, such Indebtedness may be Senior Indebtedness. See "--Certain
Covenants--Limitations on Incurrence of Indebtedness and Issuance of
Disqualified Stock."

    The old notes rank, and the exchange notes will rank, senior in right of
payment to all Subordinated Indebtedness of Alliance. Currently, Alliance has no
Subordinated Indebtedness.

OPTIONAL REDEMPTION

    At any time prior to April 15, 2004, Alliance may on any one or more
occasions redeem up to 40% of the aggregate principal amount of notes issued
under the indenture at a redemption price of 110.375% of the principal amount,
plus accrued and unpaid interest to the redemption date, with the net cash
proceeds of one or more Equity Offerings; PROVIDED that:

        (1) at least 60% of the aggregate principal amount of notes issued under
    the indenture remains outstanding immediately after the occurrence of such
    redemption; and

        (2) the redemption occurs within 60 days of the date of the closing of
    such Equity Offering.

    Except pursuant to the preceding paragraph, the notes will not be redeemable
at Alliance's option prior to April 15, 2006.

    After April 15, 2006, Alliance may redeem all or a part of the notes upon
not less than 30 nor more than 60 days' notice, at the redemption prices
(expressed as percentages of principal amount) set forth below plus accrued and
unpaid interest on the notes redeemed, to the applicable redemption date, if
redeemed during the twelve-month period beginning on April 15 of the years
indicated below:



YEAR                                                          PERCENTAGE
----                                                          ----------
                                                           
2006........................................................  105.188%
2007........................................................  103.458%
2008........................................................  101.729%
2009 and thereafter.........................................  100.00%


    At any time prior to April 15, 2006, Alliance may also redeem all or a part
of the notes upon the occurrence of a Change of Control, upon not less than 30
nor more than 60 days prior notice (but in no event may any such redemption
occur more than 90 days after the occurrence of such Change of Control) mailed
by first-class mail to each Holder's registered address, at a redemption price
equal to 100% of the principal amount of notes redeemed plus the Applicable
Premium as of, and accrued and unpaid interest, to the date of redemption.

MANDATORY REDEMPTION

    Alliance is not required to make mandatory redemption or sinking fund
payments with respect to the notes.

REPURCHASE AT THE OPTION OF HOLDERS

CHANGE OF CONTROL

    If a Change of Control occurs, each Holder of notes will have the right to
require Alliance to repurchase all or any part (equal to $1,000 or an integral
multiple of $1,000) of that Holder's notes pursuant to a Change of Control Offer
on the terms set forth in the indenture. In the Change of Control Offer,
Alliance will offer a Change of Control Payment in cash equal to 101% of the
aggregate principal amount of notes repurchased plus accrued and unpaid interest
and Liquidated Damages, if any, on the notes repurchased, to the date of
purchase. Within 30 days following any Change of

                                       76

Control, Alliance will mail a notice to each Holder describing the transaction
or transactions that constitute the Change of Control and offering to repurchase
notes on the Change of Control Payment Date specified in the notice, which date
will be no earlier than 30 days and no later than 60 days from the date such
notice is mailed, pursuant to the procedures required by the indenture and
described in such notice. Alliance will comply with the requirements of Rule
14e-1 under the Exchange Act and any other securities laws and regulations
thereunder to the extent those laws and regulations are applicable in connection
with the repurchase of the notes as a result of a Change of Control. To the
extent that the provisions of any securities laws or regulations conflict with
the Change of Control provisions of the indenture, Alliance will comply with the
applicable securities laws and regulations and will not be deemed to have
breached its obligations under the Change of Control provisions of the indenture
by virtue of such conflict.

    On the Change of Control Payment Date, Alliance will, to the extent lawful:

        (1) accept for payment all notes or portions of notes properly tendered
    pursuant to the Change of Control Offer;

        (2) deposit with the paying agent an amount equal to the Change of
    Control Payment in respect of all notes or portions of notes properly
    tendered; and

        (3) deliver or cause to be delivered to the trustee the notes properly
    accepted together with an officers' certificate stating the aggregate
    principal amount of notes or portions of notes being purchased by Alliance.

    The paying agent will promptly mail to each Holder of notes properly
tendered the Change of Control Payment for such notes, and the trustee will
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new note equal in principal amount to any unpurchased portion of
the notes surrendered, if any; PROVIDED that each new note will be in a
principal amount of $1,000 or an integral multiple of $1,000.

    Prior to complying with any of the provisions of this "Change of Control"
covenant, but in any event within 30 days following a Change of Control,
Alliance will either repay all outstanding Senior Indebtedness or obtain the
requisite consents, if any, under any outstanding Senior Indebtedness to permit
the repurchase of the notes required by this covenant.

    Alliance's bank credit agreement prohibits, and future credit agreements or
other agreements relating to Senior Indebtedness may prohibit, Alliance from
purchasing any notes as a result of a Change of Control and/or provide that
certain change of control events with respect to Alliance would constitute a
default under those agreements. If a Change of Control occurs at a time when
Alliance is prohibited from purchasing the notes, Alliance could seek the
consent of its lenders to the purchase of the notes or could attempt to
refinance the borrowings that contain the prohibition. If Alliance does not
obtain such a consent or repay the borrowings, Alliance will remain prohibited
from purchasing the notes. In that case, Alliance's failure to purchase tendered
notes would constitute an event of default under the indenture. If, as a result
of a default under the indenture, a default occurs with respect to Senior
Indebtedness, the subordination provisions in the indenture would likely
restrict payments to the Holders of the notes.

ASSET SALES

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, consummate an Asset Sale unless:

        (a) Alliance (or the Restricted Subsidiary, as the case may be) receives
    consideration at the time of the Asset Sale at least equal to the fair
    market value (as determined in good faith by Alliance) of the assets sold or
    otherwise disposed of; and

                                       77

        (b) at least 75% of the consideration received in the Asset Sale by
    Alliance or the Restricted Subsidiary is in the form of cash or Cash
    Equivalents. For purposes of this provision, each of the following will be
    deemed to be cash:

           (1) any liabilities (as shown on Alliance's or the Restricted
       Subsidiary's most recent balance sheet or in the notes thereto) of
       Alliance or any Restricted Subsidiary (other than liabilities that are by
       their terms subordinated to the notes), that are assumed by the
       transferee of any such assets;

           (2) any notes or other obligations received by Alliance or the
       Restricted Subsidiary from the transferee that are converted by Alliance
       or the Restricted Subsidiary into cash (to the extent of the cash
       received) within 180 days following the closing of the Asset Sale; and

           (3) any Designated Noncash Consideration received by Alliance or any
       of its Restricted Subsidiaries in the Asset Sale having an aggregate fair
       market value, taken together with all other Designated Noncash
       Consideration received pursuant to this clause that is at that time
       outstanding, not to exceed the greater of:

               (A) $50 million; or

               (B) 15% of Total Assets at the time of the receipt of the
           Designated Noncash Consideration (with the fair market value of each
           item of Designated Noncash Consideration being measured at the time
           received and without giving effect to subsequent changes in value),
           will be deemed to be cash for purposes of this provision.

    Within 365 days after the receipt of any Net Proceeds from an Asset Sale,
Alliance or the Restricted Subsidiary may apply those Net Proceeds at its
option:

        (a) to permanently reduce Obligations under the Credit Facility (and to
    correspondingly reduce commitments with respect thereto) or other Senior
    Indebtedness or Pari Passu Indebtedness (PROVIDED that if Alliance reduces
    Obligations under Pari Passu Indebtedness, it will equally and ratably
    reduce Obligations under the notes if the notes are then prepayable or, if
    the notes may not be then prepaid, Alliance will make an offer (in
    accordance with the procedures set forth below for an Asset Sale Offer) to
    all Holders of notes to purchase at 100% of the principal amount thereof the
    amount of notes that would otherwise be prepaid);

        (b) to an investment in any one or more businesses, capital expenditures
    or acquisitions of other assets in each case, used or useful in a Similar
    Business; or

        (c) to make an investment in properties or assets that replace the
    properties and assets that are the subject of the Asset Sale.

    Pending the final application of any Net Proceeds, Alliance or the
Restricted Subsidiary may temporarily reduce revolving credit borrowings or
otherwise invest the Net Proceeds in Cash Equivalents or Investment Grade
Securities.

    Any Net Proceeds from the Asset Sale that are not invested as provided and
within the time period set forth in the preceding paragraph will constitute
"EXCESS PROCEEDS". When the aggregate amount of Excess Proceeds exceeds $15
million, Alliance will make an Asset Sale Offer to all Holders of notes. The
offer price in any Asset Sale Offer will be equal to 100% of the principal
amount, plus accrued and unpaid interest to the date of purchase, and will be
payable in cash. If any Excess Proceeds remain after consummation of an Asset
Sale Offer, Alliance may use those proceeds for general corporate purposes. If
the aggregate principal amount of notes surrendered by Holders exceeds the
amount of Excess Proceeds, the trustee shall select the notes to be purchased in
the manner described under the caption "Selection and Notice" below. Upon
completion of any such Asset Sale Offer, the amount of Excess Proceeds shall be
reset at zero.

                                       78

    Alliance will comply with the requirements of Rule 14e-1 under the Exchange
Act and any other securities laws and regulations thereunder to the extent such
laws or regulations are applicable in connection with the repurchase of the
notes pursuant to an Asset Sale Offer. To the extent that the provisions of any
securities laws or regulations conflict with the provisions of the indenture,
Alliance will comply with the applicable securities laws and regulations and
shall not be deemed to have breached its obligations described in the indenture
by virtue of such conflict. (This second reference to footnote 17 is typed in;
actual footnote 17 reference marker is at end of paragraph above.)

SELECTION AND NOTICE

    If less than all of the notes are to be redeemed at any time, the trustee
will select notes for redemption as follows:

        (1) if the notes are listed on any national securities exchange, in
    compliance with the requirements of the principal national securities
    exchange on which the notes are listed; or

        (2) if the notes are not listed on any national securities exchange, on
    a pro rata basis, by lot or by such other method as the trustee deems fair
    and appropriate.

    No notes of $1,000 or less can be redeemed in part. Notices of purchase or
redemption will be mailed by first class mail, postage prepaid, at least 30 but
not more than 60 days before the purchase or redemption date to each Holder of
notes to be redeemed at its registered address.

    If any note is to be redeemed in part only, the notice of redemption that
relates to that note will state the portion of the principal amount of that note
that is to be redeemed. A new note in principal amount equal to the unredeemed
portion of the original note will be issued in the name of the Holder upon
cancellation of the original note. On and after the purchase or redemption date,
unless Alliance defaults in payment of the purchase or redemption price,
interest ceases to accrue on notes or portions of them purchased or called for
redemption.

CERTAIN COVENANTS

LIMITATION ON RESTRICTED PAYMENTS

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly:

        (a) declare or pay any dividend or make any distribution on account of
    Alliance's or any of its Restricted Subsidiaries' Equity Interests,
    including any dividend or distribution payable in connection with any merger
    or consolidation (other than (1) dividends or distributions by Alliance
    payable in Equity Interests (other than Disqualified Stock) of Alliance or
    (2) dividends or distributions by a Restricted Subsidiary so long as, in the
    case of any dividend or distribution payable on or in respect of any class
    or series of securities issued by a Restricted Subsidiary other than a
    Wholly Owned Subsidiary, Alliance or a Restricted Subsidiary receives at
    least its pro rata share of such dividend or distribution in accordance with
    its Equity Interests in such class or series of securities);

        (b) purchase, redeem, defease or otherwise acquire or retire for value
    any Equity Interests of Alliance or any direct or indirect parent of
    Alliance;

        (c) make any principal payment on, or redeem, repurchase, defease or
    otherwise acquire or retire for value in each case, prior to any scheduled
    repayment, or maturity, any Subordinated Indebtedness (other than
    Indebtedness permitted under clauses (g) and (i) of the covenant described
    under "--Limitations on Incurrence of Indebtedness and Issuance of
    Disqualified Stock"); or

        (d) make any Restricted Investment;

                                       79

    unless, at the time of such Restricted Payment:

           (1) no default or event of default under the indenture has occurred
       and is continuing or would occur as a consequence of the Restricted
       Payment;

           (2) immediately before and immediately after giving effect to such
       transaction on a pro forma basis, Alliance could incur $1.00 of
       additional Indebtedness under the provisions of the first paragraph of
       "--Limitations on Incurrence of Indebtedness and Issuance of Disqualified
       Stock"; and

           (3) such Restricted Payment, together with the aggregate amount of
       all other Restricted Payments made by Alliance and its Restricted
       Subsidiaries after the date of the indenture (including Restricted
       Payments permitted by clauses (a), (e) (only to the extent that amounts
       paid pursuant to such clause are greater than amounts that would have
       been paid pursuant to such clause if $5 million and $10 million were
       substituted in such clause for $10 million and $20 million,
       respectively), (f), (i) and (j) of the next succeeding paragraph, but
       excluding all other Restricted Payments permitted by the next succeeding
       paragraph), is less than the sum of:

               (A) 50% of the Consolidated Net Income of Alliance for the period
           (taken as one accounting period) from the fiscal quarter that first
           begins after the date of the indenture to the end of Alliance's most
           recently ended fiscal quarter for which internal financial statements
           are available at the time of such Restricted Payment (or, in the case
           such Consolidated Net Income for such period is a deficit, minus 100%
           of such deficit), PLUS

               (B) 100% of the aggregate net cash proceeds and the fair market
           value, as determined in good faith by the board of directors, of
           marketable securities received by Alliance since immediately after
           the date of the indenture from the issue or sale of Equity Interests
           of Alliance (excluding Excluded Contributions) or debt securities
           issued or sold after the date of the indenture of Alliance that have
           been converted into such Equity Interests (including Retired Capital
           Stock) of Alliance (other than Refunding Capital Stock (as defined
           below) or Equity Interests or convertible debt securities of Alliance
           sold to a Restricted Subsidiary of Alliance and other than
           Disqualified Stock or debt securities that have been converted into
           Disqualified Stock), PLUS

               (C) the aggregate amount by which Indebtedness (other than
           Subordinated Indebtedness) of Alliance or any Restricted Subsidiary
           is reduced on Alliance's consolidated balance sheet on or after the
           date of the indenture upon the conversion or exchange of any debt
           securities issued or sold on or prior to the date of the indenture
           that is convertible into Equity Interests of Alliance (other than
           Refunding Capital Stock (as defined below) or Equity Interests or
           convertible debt securities of Alliance sold to a Restricted
           Subsidiary of Alliance and other than Disqualified Stock or debt
           securities that have been converted into Disqualified Stock); PLUS

               (D) 100% of the aggregate amount of cash and marketable
           securities contributed to the capital of Alliance following the date
           of the indenture (excluding Excluded Contributions), PLUS

               (E) 100% of the aggregate amount received in cash and the fair
           market value of marketable securities (other than Restricted
           Investments) received from:

                   (i) the sale or other disposition (other than to Alliance or
               a Restricted Subsidiary) of Restricted Investments made by
               Alliance and its Restricted Subsidiaries; or

                                       80

                   (ii) a dividend from, or the sale (other than to Alliance or
               a Restricted Subsidiary) of the stock of, an Unrestricted
               Subsidiary (other than an Unrestricted Subsidiary the Investment
               in which was made by Alliance or a Restricted Subsidiary pursuant
               to clause (g) or (k) below).

    The preceding provisions will not prohibit:

        (a) the payment of any dividend within 60 days after the date of
    declaration thereof, if at the date of declaration such payment would have
    complied with the provisions of the indenture;

        (b) (1) the redemption, repurchase, retirement or other acquisition of
    any Equity Interests (the "RETIRED CAPITAL STOCK") or Subordinated
    Indebtedness of Alliance in exchange for, or out of the proceeds of the
    substantially concurrent sale (other than to a Restricted Subsidiary) of,
    Equity Interests of Alliance (other than any Disqualified Stock) (the
    "REFUNDING CAPITAL STOCK"), and (2) if immediately prior to the retirement
    of such Retired Capital Stock, the declaration and payment of dividends
    thereon was permitted under clause (f) of this paragraph, the declaration
    and payment of dividends on such Refunding Capital Stock in an aggregate
    amount per year no greater than the aggregate amount of dividends per annum
    that was declarable and payable on such Retired Capital Stock immediately
    prior to such retirement; PROVIDED that at the time of the declaration of
    any such dividends, no default or event of default under the indenture has
    occurred and is continuing or would occur as a consequence thereof;

        (c) distributions or payments of Receivables Fees;

        (d) the redemption, repurchase or other acquisition or retirement of
    Subordinated Indebtedness of Alliance made by exchange for, or out of the
    proceeds of the substantially concurrent sale of, new Indebtedness of
    Alliance so long as:

           (1) the principal amount of such new Indebtedness does not exceed the
       principal amount of the Subordinated Indebtedness being so redeemed,
       repurchased, acquired or retired for value (plus the amount of any
       premium required to be paid under the terms of the instrument governing
       the Subordinated Indebtedness being so redeemed, repurchased, acquired or
       retired, and fees and expenses payable in connection with such
       redemption, repurchase, acquisition or retirement);

           (2) such Indebtedness is subordinated to the Senior Indebtedness and
       the notes at least to the same extent as such Subordinated Indebtedness
       so purchased, exchanged, redeemed, repurchased, acquired or retired for
       value;

           (3) such Indebtedness has a final scheduled maturity date equal to or
       later than the final scheduled maturity date of the Subordinated
       Indebtedness being so redeemed, repurchased, acquired or retired; and

           (4) such Indebtedness has a Weighted Average Life to Maturity equal
       to or greater than the remaining Weighted Average Life to Maturity of the
       Subordinated Indebtedness being so redeemed, repurchased, acquired or
       retired;

        (e) a Restricted Payment to pay for the repurchase, retirement or other
    acquisition or retirement for value of common Equity Interests of Alliance
    held by any future, present or former employee, director or consultant of
    Alliance or any Subsidiary pursuant to any management equity plan,
    stockholder agreement or stock option plan or any other management or
    employee benefit plan or agreement; PROVIDED that the aggregate Restricted
    Payments made under this clause (e) does not exceed in any calendar year $10
    million (with unused amounts in any calendar year being carried over to
    succeeding calendar years subject to a maximum (without giving effect to the
    following proviso) of $20 million in any calendar year); PROVIDED FURTHER
    that such amount in any calendar year may be increased by an amount not to
    exceed:

                                       81

           (1) the cash proceeds from the sale of Equity Interests of Alliance
       to members of management, directors or consultants of Alliance and its
       Subsidiaries that occurs after the date of the indenture (to the extent
       the cash proceeds from the sale of such Equity Interests have not
       otherwise been applied to the payment of Restricted Payments by virtue of
       the preceding paragraph (3)) PLUS

           (2) the cash proceeds of key man life insurance policies received by
       Alliance and its Restricted Subsidiaries after the date of the indenture
       LESS

           (3) the amount of any Restricted Payments previously made pursuant to
       clauses (1) and (2) of this subparagraph (e);

and PROVIDED FURTHER that cancellation of Indebtedness owing to Alliance from
members of management of Alliance or any of its Restricted Subsidiaries in
connection with a repurchase of Equity Interests of Alliance will not constitute
a Restricted Payment for purposes of this covenant or any other provision of the
indenture;

        (f) the declaration and payment of dividends to holders of any class or
    series of Designated Preferred Stock (other than Disqualified Stock) issued
    after the date of the indenture (including the declaration and payment of
    dividends on Refunding Capital Stock in excess of the dividends declarable
    and payable pursuant to clause (b)); PROVIDED that for the most recently
    ended four full fiscal quarters for which internal financial statements are
    available immediately preceding the date of issuance of such Designated
    Preferred Stock, after giving effect to such issuance on a pro forma basis,
    Alliance and its Restricted Subsidiaries would have had a Fixed Charge
    Coverage Ratio of at least 1.75 to 1.00;

        (g) Investments in Unrestricted Subsidiaries having an aggregate fair
    market value, taken together with all other Investments made pursuant to
    this clause (g) that are at that time outstanding, not to exceed $45 million
    at the time of such Investment (with the fair market value of each
    Investment being measured at the time made and without giving effect to
    subsequent changes in value);

        (h) repurchases of Equity Interests deemed to occur upon exercise of
    stock options if such Equity Interests represent a portion of the exercise
    price of such options;

        (i) the payment of dividends on Alliance's common stock, following the
    first public offering of Alliance's common stock on or after the date of the
    indenture, of up to 6% per annum of the net proceeds received by Alliance in
    such public offering, other than public offerings with respect to Alliance's
    common stock registered on Form S-8;

        (j) a Restricted Payment to pay for the repurchase, retirement or other
    acquisition or retirement for value of Equity Interests of Alliance which
    are not held by KKR or any of its affiliates (including any Equity Interests
    issued in respect of such Equity Interests as a result of a stock split,
    recapitalization, merger, combination, consolidation or otherwise, but
    excluding any management equity plan or stock option plan or similar
    agreement), provided that the aggregate Restricted Payments made under this
    clause (j) shall not exceed $50 million, PROVIDED FURTHER that prior to the
    first anniversary of the date of the indenture, no Restricted Payments may
    be made under this clause (j) and PROVIDED FURTHER that notwithstanding the
    foregoing, Alliance shall be permitted to make Restricted Payments under
    this clause (j) only if after giving effect thereto, Alliance would be
    permitted to incur at least $1.00 of additional Indebtedness pursuant to the
    Fixed Charge Coverage Ratio test set forth in the first sentence of the
    covenant described under "--Limitations on Incurrence of Indebtedness and
    Issuance of Disqualified Stock";

        (k) Investments in Unrestricted Subsidiaries that are made with Excluded
    Contributions;

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        (l) the payment of dividends on Disqualified Stock which is issued in
    accordance with the covenant described under "--Limitations on Incurrence of
    Indebtedness and Issuance of Disqualified Stock"; and

        (m) other Restricted Payments in an aggregate amount not to exceed $25
    million;

PROVIDED that at the time of, and after giving effect to, any Restricted Payment
permitted under clauses (d), (e), (f), (g), (h), (i), (j), (k), (l) and (m), no
default or event of default under the indenture shall have occurred and be
continuing or would occur as a consequence of the Restricted Payment; and
provided further that for purposes of determining the aggregate amount expended
for Restricted Payments in accordance with clause (3) of the immediately
preceding paragraph, only the amounts expended under clauses (a), (e) (only to
the extent that amounts paid pursuant to such clause are greater than amounts
that would have been paid pursuant to such clause if $5 million and $10 million
were substituted in such clause for $10 million and $20 million, respectively),
(f), (i) and (j) will be included.

    In the future, Alliance will not permit any Unrestricted Subsidiary to
become a Restricted Subsidiary except pursuant to the second to last sentence of
the definition of "UNRESTRICTED SUBSIDIARY." For purposes of designating any
Restricted Subsidiary as an Unrestricted Subsidiary, all outstanding Investments
by Alliance and its Restricted Subsidiaries (except to the extent repaid) in the
Subsidiary so designated will be deemed to be Restricted Payments in an amount
determined as set forth in the last sentence of the definition of "INVESTMENTS."
Such designation will only be permitted if a Restricted Payment in that amount
would be permitted at the time (whether pursuant to the first paragraph of this
covenant or under clause (g), (k) or (m)) and if the Subsidiary otherwise meets
the definition of an Unrestricted Subsidiary. Unrestricted Subsidiaries will not
be subject to any of the restrictive covenants set forth in the indenture.

LIMITATIONS ON INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED STOCK

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create, incur, issue, assume, guarantee or otherwise
become directly or indirectly liable, contingently or otherwise, with respect to
(collectively, "INCUR" and collectively, an "INCURRENCE") any Indebtedness
(including Acquired Indebtedness) and Alliance will not issue any shares of
Disqualified Stock and will not permit any of its Restricted Subsidiaries to
issue any shares of preferred stock; PROVIDED, HOWEVER, that Alliance may incur
Indebtedness (including Acquired Indebtedness) or issue shares of Disqualified
Stock if the Fixed Charge Coverage Ratio for Alliance's and the Restricted
Subsidiaries' most recently ended four full fiscal quarters for which internal
financial statements are available immediately preceding the date on which such
additional Indebtedness is incurred or such Disqualified Stock is issued would
have been:

    - if such incurrence occurs on or prior to April 15, 2003, at least 1.75 to
      1.00; and

    - if such incurrence occurs after April 15, 2003, at least 2.00 to 1.00,

in each case, determined on a pro forma basis (including a pro forma application
of the net proceeds therefrom), as if the additional Indebtedness had been
incurred, or the Disqualified Stock had been issued, as the case may be, and the
application of proceeds therefrom had occurred at the beginning of such
four-quarter period.

    The first paragraph of this covenant will not apply to:

        (a) the incurrence by Alliance or its Restricted Subsidiaries of
    Indebtedness under Credit Facilities and the issuance and creation of
    letters of credit and banker's acceptances thereunder (with letters of
    credit and banker's acceptances being deemed to have a principal amount
    equal to

                                       83

    the face amount thereof) up to an aggregate principal amount of $650 million
    outstanding at any one time;

        (b) the incurrence by Alliance of Indebtedness represented by the notes;

        (c) the Existing Indebtedness (other than Indebtedness described in
    clauses (a) and (b));

        (d) Indebtedness (including Capitalized Lease Obligations) incurred by
    Alliance or any of its Restricted Subsidiaries, to finance the purchase,
    lease or improvement of property (real or personal) or equipment (whether
    through the direct purchase of assets or the Capital Stock of any Person
    owning such assets) in an aggregate principal amount which, when aggregated
    with the principal amount of all other Indebtedness then outstanding and
    incurred pursuant to this clause (d) and including all Refinancing
    Indebtedness incurred to refund, refinance or replace any other Indebtedness
    incurred pursuant to this clause (d), does not exceed the greater of (1) $50
    million or (2) 15% of Total Assets;

        (e) Indebtedness incurred by Alliance or any of its Restricted
    Subsidiaries constituting reimbursement obligations with respect to letters
    of credit issued in the ordinary course of business, including without
    limitation letters of credit in respect of workers' compensation claims or
    self-insurance, or other Indebtedness with respect to reimbursement type
    obligations regarding workers' compensation claims; PROVIDED, HOWEVER, that
    upon the drawing of such letters of credit or the incurrence of such
    Indebtedness, such obligations are reimbursed within 30 days following such
    drawing or incurrence;

        (f) Indebtedness arising from agreements of Alliance or a Restricted
    Subsidiary providing for indemnification, adjustment of purchase price or
    similar obligations, in each case, incurred or assumed in connection with
    the disposition of any business, assets or a Subsidiary, other than
    guarantees of Indebtedness incurred by any Person acquiring all or any
    portion of such business, assets or a Subsidiary for the purpose of
    financing such acquisition; PROVIDED, HOWEVER, that:

           (1) such Indebtedness is not reflected on the balance sheet of
       Alliance or any Restricted Subsidiary (contingent obligations referred to
       in a footnote to financial statements and not otherwise reflected on the
       balance sheet will not be deemed to be reflected on such balance sheet
       for purposes of this clause (1)); and

           (2) the maximum assumable liability in respect of all such
       Indebtedness will at no time exceed the gross proceeds including noncash
       proceeds (the fair market value of such noncash proceeds being measured
       at the time received and without giving effect to any subsequent changes
       in value) actually received by Alliance and its Restricted Subsidiaries
       in connection with such disposition;

        (g) Indebtedness of Alliance to a Restricted Subsidiary; PROVIDED that
    any such Indebtedness is made pursuant to an intercompany note and is
    subordinated in right of payment to the notes; PROVIDED FURTHER that any
    subsequent issuance or transfer of any Capital Stock or any other event
    which will result in any such Restricted Subsidiary ceasing to be a
    Restricted Subsidiary or any other subsequent transfer of any such
    Indebtedness (except to Alliance or another Restricted Subsidiary) will be
    deemed, in each case, to be an incurrence of such Indebtedness;

        (h) shares of preferred stock of a Restricted Subsidiary issued to
    Alliance or another Restricted Subsidiary; PROVIDED that any subsequent
    issuance or transfer of any Capital Stock or any other event which results
    in any such Restricted Subsidiary ceasing to be a Restricted Subsidiary or
    any other subsequent transfer of any such shares of preferred stock (except
    to Alliance or another Restricted Subsidiary) will be deemed, in each case
    to be an issuance of shares of preferred stock;

                                       84

        (i) Indebtedness of a Restricted Subsidiary to Alliance or another
    Restricted Subsidiary; provided that:

           (1) any such Indebtedness is made pursuant to an intercompany note;
       and

           (2) if a Guarantor incurs such Indebtedness from a Restricted
       Subsidiary that is not a Guarantor such Indebtedness is subordinated in
       right of payment to the Guarantee of such Guarantor;

       PROVIDED FURTHER that any subsequent transfer of any such Indebtedness
       (except to Alliance or another Restricted Subsidiary) or any other event
       which results in any such Restricted Subsidiary ceasing to be a
       Restricted Subsidiary shall be deemed, in each case to be an incurrence
       of such Indebtedness;

        (j) Hedging Obligations that are incurred in the ordinary course of
    business:

           (1) for the purpose of fixing or hedging interest rate risk with
       respect to any Indebtedness that is permitted by the terms of the
       indenture to be outstanding; or

           (2) for the purpose of fixing or hedging currency exchange rate risk
       with respect to any currency exchanges;

        (k) obligations in respect of performance and surety bonds and
    completion guarantees provided by Alliance or any Restricted Subsidiary in
    the ordinary course of business;

        (l) Indebtedness of any Guarantor in respect of such Guarantor's
    Guarantee;

        (m) Indebtedness of Alliance and any of its Restricted Subsidiaries not
    otherwise permitted hereunder in an aggregate principal amount, which when
    aggregated with the principal amount of all other Indebtedness then
    outstanding and incurred pursuant to this clause (m), does not exceed $150
    million at any one time outstanding; PROVIDED, HOWEVER, that Indebtedness of
    a Restricted Subsidiary organized under the laws of the United States, any
    state thereof, the District of Columbia or any territory thereof, which when
    aggregated with the principal amount of all other Indebtedness of such
    Restricted Subsidiaries then outstanding and incurred pursuant to this
    clause (m), does not exceed $60 million at any one time outstanding;

        (n) (1) any guarantee by Alliance of Indebtedness or other obligations
    of any of its Restricted Subsidiaries so long as the incurrence of such
    Indebtedness incurred by such Restricted Subsidiary is permitted under the
    terms of the indenture and (2) any Excluded Guarantee (as defined below
    under "--Limitation on Guarantees of Indebtedness by Restricted
    Subsidiaries") of a Restricted Subsidiary;

        (o) the incurrence by Alliance or any of its Restricted Subsidiaries of
    Indebtedness which serves to refund, refinance or restructure any
    Indebtedness incurred as permitted under the first paragraph of this
    covenant and clauses (b), (c), (d) and (l) above or clause (p) below, or any
    Indebtedness issued to so refund, refinance or restructure such Indebtedness
    including additional Indebtedness incurred to pay premiums, expenses and
    fees in connection therewith (the "REFINANCING INDEBTEDNESS") prior to its
    respective maturity; PROVIDED, HOWEVER, that such Refinancing Indebtedness:

           (1) has a Weighted Average Life to Maturity at the time such
       Refinancing Indebtedness is incurred which is not less than the remaining
       Weighted Average Life to Maturity of Indebtedness being refunded or
       refinanced;

           (2) to the extent such Refinancing Indebtedness refinances
       Indebtedness subordinated or PARI PASSU to the notes, such Refinancing
       Indebtedness is subordinated or PARI PASSU to the notes at least to the
       same extent as the Indebtedness being refinanced or refunded; and

                                       85

           (3) shall not include:

               (x) Indebtedness of a Subsidiary that refinances Indebtedness of
           Alliance or Indebtedness of a non-Guarantor that refinances
           Indebtedness of a Guarantor; or

               (y) Indebtedness of Alliance or a Restricted Subsidiary that
           refinances Indebtedness of an Unrestricted Subsidiary;

       and PROVIDED FURTHER that subclauses (1) and (2) of this clause (o) will
       not apply to any refunding or refinancing of any Senior Indebtedness;

        (p) Indebtedness or Disqualified Stock of persons that are acquired by
    Alliance or any of its Restricted Subsidiaries or merged into a Restricted
    Subsidiary in accordance with the terms of the indenture; PROVIDED that such
    Indebtedness or Disqualified Stock is not incurred in contemplation of such
    acquisition or merger; and PROVIDED FURTHER that after giving effect to such
    acquisition or merger, either:

           (1) Alliance would be permitted to incur at least $1.00 of additional
       Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth
       in the first sentence of this covenant; or

           (2) the Fixed Charge Coverage Ratio is greater than immediately prior
       to such acquisition or merger; and

        (q) guarantees by Alliance or its Restricted Subsidiaries of the
    obligations of joint ventures of Alliance or its Restricted Subsidiaries;
    PROVIDED that the maximum aggregate amount of all such guaranteed
    obligations shall at no time exceed $25 million.

    For purposes of determining compliance with this covenant, in the event that
an item of Indebtedness meets the criteria of more than one of the categories of
permitted Indebtedness described in clauses (a) through (q) above or is entitled
to be incurred pursuant to the first paragraph of this covenant, Alliance will,
in its sole discretion, classify the item of Indebtedness in any manner that
complies with this covenant and the item of Indebtedness will be treated as
having been incurred pursuant to only one of such clauses or pursuant to the
first paragraph of this covenant. Accrual of interest, the accretion of accreted
value and the payment of interest in the form of additional Indebtedness will
not be deemed to be an incurrence of Indebtedness for purposes of this covenant.

LIENS

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly create, incur, assume or suffer to exist any Lien
that secures obligations under any Pari Passu Indebtedness or Subordinated
Indebtedness on any asset or property of Alliance or such Restricted Subsidiary,
or any income or profits therefrom, or assign or convey any right to receive
income therefrom, unless:

        (a) if such Lien secures Pari Passu Indebtedness, the notes are equally
    and ratably secured with the obligations so secured; or

        (b) if such Lien secures Subordinated Indebtedness, the notes are
    secured by a Lien on the same property, assets, income or profits which is
    senior to such Lien to the same extent as the notes are senior to such
    Subordinated Indebtedness,

in each case until such time as such obligations are no longer secured by a
Lien.

    No Guarantor will directly or indirectly create, incur, assume or suffer to
exist any Lien that secures obligations under any Pari Passu Indebtedness or
Subordinated Indebtedness of such Guarantor

                                       86

on any asset or property of such Guarantor or any income or profits therefrom,
or assign or convey any right to receive income therefrom, unless:

        (a) if such Lien secures Pari Passu Indebtedness, the Guarantee of such
    Guarantor is equally and ratably secured with the obligations so secured; or

        (b) if such Lien secures Subordinated Indebtedness, the Guarantee of
    such Guarantor is secured by a Lien on the same property, assets, income or
    profits which is senior to such Lien to the same extent as the Guarantee of
    such Guarantor is senior to such Subordinated Indebtedness,

in each case until such time as such obligations are no longer secured by a
Lien.

DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING SUBSIDIARIES

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create or otherwise cause or suffer to exist or
become effective any consensual encumbrance or consensual restriction on the
ability of any Restricted Subsidiary to:

        (a) (1) pay dividends or make any other distributions to Alliance or any
    of its Restricted Subsidiaries (A) on its Capital Stock or (B) with respect
    to any other interest or participation in, or measured by, its profits, or
    (2) pay any Indebtedness owed to Alliance or any of its Restricted
    Subsidiaries;

        (b) make loans or advances to Alliance or any of its Restricted
    Subsidiaries; or

        (c) sell, lease or transfer any of its properties or assets to Alliance
    or any of its Restricted Subsidiaries;

    except (in each case) for such encumbrances or restrictions existing under
or by reason of:

           (1) contractual encumbrances or restrictions in effect on the date of
       the indenture, including pursuant to the Credit Facility and its related
       documentation;

           (2) the indenture and the notes;

           (3) purchase money obligations for property acquired in the ordinary
       course of business that impose restrictions of the nature discussed in
       clause (c) above on the property so acquired;

           (4) applicable law or any applicable rule, regulation or order;

           (5) any agreement or other instrument of a Person acquired by
       Alliance or any Restricted Subsidiary in existence at the time of such
       acquisition (but not created in contemplation thereof), which encumbrance
       or restriction is not applicable to any Person, or the properties or
       assets of any Person, other than the Person, or the property or assets of
       the Person, so acquired;

           (6) contracts for the sale of assets, including, without limitation,
       customary restrictions with respect to a Subsidiary pursuant to an
       agreement that has been entered into for the sale or disposition of all
       or substantially all of the Capital Stock or assets of such Subsidiary;

           (7) secured Indebtedness otherwise permitted to be incurred pursuant
       to the covenants described under "--Limitations on Incurrence of
       Indebtedness and Issuance of Disqualified Stock" and "--Liens" that limit
       the right of the debtor to dispose of the assets securing such
       Indebtedness;

           (8) restrictions on cash or other deposits or net worth imposed by
       customers under contracts entered into in the ordinary course of
       business;

                                       87

           (9) other Indebtedness of Restricted Subsidiaries permitted to be
       incurred subsequent to the date of the indenture pursuant to the
       provisions of the covenant described under "--Limitations on Incurrence
       of Indebtedness and Issuance of Disqualified Stock";

           (10) customary provisions in joint venture agreements and other
       similar agreements entered into in the ordinary course of business;

           (11) customary provisions contained in leases and other agreements
       entered into in the ordinary course of business;

           (12) restrictions created in connection with any Receivables Facility
       that, in the good faith determination of the board of directors of
       Alliance, are necessary or advisable to effect such Receivables Facility;
       or

           (13) any encumbrances or restrictions of the type referred to in
       clauses (a), (b) and (c) above imposed by any amendments, modifications,
       restatements, renewals, increases, supplements, refundings, replacements
       or refinancings of the contracts, instruments or obligations referred to
       in clauses (1) through (12) above, PROVIDED that the amendments,
       modifications, restatements, renewals, increases, supplements,
       refundings, replacements or refinancings are, in the good faith judgment
       of Alliance's board of directors, no more restrictive with respect to
       such dividend and other payment restrictions than those contained in the
       dividend or other payment restrictions prior to such amendment,
       modification, restatement, renewal, increase, supplement, refunding,
       replacement or refinancing.

MERGER, CONSOLIDATION, OR SALE OF ALL OR SUBSTANTIALLY ALL ASSETS

    Alliance will not consolidate or merge with or into or wind up into (whether
or not Alliance is the surviving corporation), or sell, assign, transfer, lease,
convey or otherwise dispose of all or substantially all of its properties or
assets in one or more related transactions, to any Person unless:

        (a) Alliance is the surviving corporation or the Person formed by or
    surviving any such consolidation or merger (if other than Alliance) or to
    which such sale, assignment, transfer, lease, conveyance or other
    disposition will have been made is a corporation organized or existing under
    the laws of the United States, any state thereof, the District of Columbia,
    or any territory thereof (Alliance or such Person, as the case may be, being
    herein called the "SUCCESSOR COMPANY");

        (b) the Successor Company (if other than Alliance) expressly assumes all
    the obligations of Alliance under the indenture and the notes pursuant to a
    supplemental indenture or other documents or instruments in form reasonably
    satisfactory to the trustee;

        (c) immediately after such transaction no default or event of default
    under the indenture has occurred and is continuing;

        (d) immediately after giving pro forma effect to such transaction, as if
    such transaction had occurred at the beginning of the applicable
    four-quarter period:

           (1) the Successor Company would be permitted to incur at least $1.00
       of additional Indebtedness pursuant to the Fixed Charge Coverage Ratio
       test set forth in the first sentence of the covenant described under
       "--Limitations on Incurrence of Indebtedness and Issuance of Disqualified
       Stock"; or

           (2) the Fixed Charge Coverage Ratio for the Successor Company and its
       Restricted Subsidiaries would be greater than such ratio for Alliance and
       its Restricted Subsidiaries immediately prior to such transaction;

                                       88

        (e) each Guarantor, if any, unless it is the other party to the
    transactions described above, has by supplemental indenture confirmed that
    its Guarantee applies to such Person's obligations under the indenture and
    the notes; and

        (f) Alliance delivers to the trustee an officers' certificate and an
    opinion of counsel, each stating that such consolidation, merger or transfer
    and such supplemental indenture (if any) comply with the indenture.

    The Successor Company will succeed to, and be substituted for, Alliance
under the indenture and the notes.

    Notwithstanding the foregoing clause (d):

        (1) any Restricted Subsidiary may consolidate with, merge into or
    transfer all or part of its properties and assets to Alliance; and

        (2) Alliance may merge with an Affiliate incorporated solely for the
    purpose of reincorporating Alliance in another state of the United States so
    long as the amount of Indebtedness of Alliance and its Restricted
    Subsidiaries is not increased thereby.

    Each Guarantor, if any, will not, and Alliance will not permit a Guarantor
to, consolidate or merge with or into or wind up into (whether or not the
Guarantor is the surviving corporation), or sell, assign, transfer, lease,
convey or otherwise dispose of all or substantially all of its properties or
assets in one or more related transactions to, any Person unless:

        (a) such Guarantor is the surviving corporation or the Person formed by
    or surviving any such consolidation or merger (if other than such Guarantor)
    or to which such sale, assignment, transfer, lease, conveyance or other
    disposition will have been made is a corporation organized or existing under
    the laws of the United States, any state thereof, the District of Columbia,
    or any territory thereof (such Guarantor or such Person, as the case may be,
    being herein called the "SUCCESSOR GUARANTOR");

        (b) the Successor Guarantor (if other than such Guarantor) expressly
    assumes all the obligations of such Guarantor under the indenture and the
    Guarantor's Guarantee pursuant to a supplemental indenture or other
    documents or instruments in form reasonably satisfactory to the trustee;

        (c) immediately after such transaction no default or event of default
    under the indenture has occurred and is continuing; and

        (d) the Guarantor has delivered or caused to be delivered to the trustee
    an officers' certificate and an opinion of counsel, each stating that such
    consolidation, merger or transfer and such supplemental indenture (if any)
    comply with the indenture.

    The Successor Guarantor will succeed to, and be substituted for, such
Guarantor under the indenture and such Guarantor's Guarantee.

TRANSACTIONS WITH AFFILIATES

    Alliance will not, and will not permit any of its Restricted Subsidiaries
to, make any payment to, or sell, lease, transfer or otherwise dispose of any of
its properties or assets to, or purchase any property or assets from, or enter
into or make or amend any transaction, contract, agreement, understanding, loan,
advance or guarantee with, or for the benefit of, any Affiliate (each of the
foregoing, an "AFFILIATE TRANSACTION") involving aggregate consideration in
excess of $5 million, unless:

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        (a) the Affiliate Transaction is on terms that are not materially less
    favorable to Alliance or the relevant Restricted Subsidiary than those that
    would have been obtained in a comparable transaction by Alliance or the
    Restricted Subsidiary with an unrelated Person; and

        (b) Alliance delivers to the trustee with respect to any Affiliate
    Transaction or series of related Affiliate Transactions involving aggregate
    consideration in excess of $10 million, a resolution adopted by the majority
    of the board of directors of Alliance approving the Affiliate Transaction
    and set forth in an officers' certificate certifying that the Affiliate
    Transaction complies with clause (a) above.

    The preceding paragraph will not apply to the following:

        (1) transactions between or among Alliance and/or any of its Restricted
    Subsidiaries;

        (2) Restricted Payments permitted by the provisions of the indenture
    described above under the covenant "--Limitation on Restricted Payments" or
    Permitted Investments;

        (3) the payment of customary annual management, consulting and advisory
    fees and related expenses to KKR and its Affiliates;

        (4) the payment of reasonable and customary fees paid to, and indemnity
    provided on behalf of, officers, directors, employees or consultants of
    Alliance or any Restricted Subsidiary;

        (5) payments by Alliance or any of its Restricted Subsidiaries to KKR
    and its Affiliates made for any financial advisory, financing, underwriting
    or placement services or in respect of other investment banking activities,
    including in connection with acquisitions or divestitures which payments are
    approved by a majority of the board of directors of Alliance in good faith;

        (6) transactions in which Alliance or any of its Restricted
    Subsidiaries, as the case may be, delivers to the trustee a letter from an
    Independent Financial Advisor stating that the transaction is fair to
    Alliance or the Restricted Subsidiary from a financial point of view,
    PROVIDED that the transaction also meets the requirements of clause (a) of
    the preceding paragraph;

        (7) payments or loans to employees or consultants which are approved by
    a majority of the board of directors of Alliance in good faith;

        (8) any agreement as in effect date of the indenture or any amendment
    thereto (so long as any such amendment is not disadvantageous to the Holders
    of the notes in any material respect) or any transaction contemplated
    thereby;

        (9) the existence of, or the performance by Alliance or any of its
    Restricted Subsidiaries of its obligations under the terms of, any
    stockholders agreement (including any registration rights agreement or
    purchase agreement related thereto) to which it is a party as of the date of
    the indenture and any similar agreements which it may enter into thereafter;
    PROVIDED, HOWEVER, that the existence of, or the performance by Alliance or
    any of its Restricted Subsidiaries of obligations under any future amendment
    to any such existing agreement or under any similar agreement entered into
    after the date of the indenture shall only be permitted by this clause (9)
    to the extent that the terms of any such amendment or new agreement are not
    otherwise disadvantageous to the Holders of the notes in any material
    respect;

        (10) transactions with customers, clients, suppliers, or purchasers or
    sellers of goods or services, in each case in the ordinary course of
    business and otherwise in compliance with the terms of the indenture, which
    are fair to Alliance or its Restricted Subsidiaries, in the reasonable
    determination of the board of directors of Alliance or the senior management
    thereof, or are on terms at least as favorable as might reasonably have been
    obtained at such time from an unaffiliated party; and

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        (11) sales of accounts receivable, or participations therein, in
    connection with any Receivables Facility.

LIMITATION ON GUARANTEES OF INDEBTEDNESS BY RESTRICTED SUBSIDIARIES

        (a) Alliance will not permit any Restricted Subsidiary to guarantee the
    payment of any Indebtedness of Alliance or any Indebtedness of any other
    Restricted Subsidiary unless:

           (1) the Restricted Subsidiary simultaneously executes and delivers a
       supplemental indenture to the indenture providing for a Guarantee of
       payment of the notes by the Restricted Subsidiary except that:

               (A) if the notes are subordinated in right of payment to such
           Indebtedness, the Guarantee under the supplemental indenture shall be
           subordinated to such Restricted Subsidiary's guarantee with respect
           to such Indebtedness substantially to the same extent as the notes
           are subordinated to such Indebtedness under the indenture; and

               (B) if such Indebtedness is by its express terms subordinated in
           right of payment to the notes, any such guarantee of such Restricted
           Subsidiary with respect to such Indebtedness shall be subordinated in
           right of payment to such Restricted Subsidiary's Guarantee with
           respect to the notes substantially to the same extent as such
           Indebtedness is subordinated to the notes;

           (2) the Restricted Subsidiary waives and will not in any manner
       whatsoever claim or take the benefit or advantage of, any rights of
       reimbursement, indemnity or subrogation or any other rights against
       Alliance or any other Restricted Subsidiary as a result of any payment by
       such Restricted Subsidiary under its Guarantee; and

           (3) the Restricted Subsidiary shall deliver to the trustee an opinion
       of counsel to the effect that:

               (A) the Guarantee of the notes has been duly executed and
           authorized; and

               (B) the Guarantee of the notes constitutes a valid, binding and
           enforceable obligation of such Restricted Subsidiary, except insofar
           as enforcement thereof may be limited by bankruptcy, insolvency or
           similar laws (including, without limitation, all laws relating to
           fraudulent transfers) and except insofar as enforcement thereof is
           subject to general principles of equity;

       PROVIDED that this paragraph (a) shall not be applicable to any guarantee
       of any Restricted Subsidiary:

           (x) that (A) existed at the time such Person became a Restricted
       Subsidiary of Alliance and (B) was not incurred in connection with, or in
       contemplation of, such Person becoming a Restricted Subsidiary of
       Alliance; or

           (y) that guarantees the payment of Obligations of Alliance or any
       Restricted Subsidiary under the Credit Facility or any other bank
       facility which is designated as Senior Indebtedness and any refunding,
       refinancing or replacement thereof, in whole or in part, PROVIDED that
       such refunding, refinancing or replacement thereof constitutes Senior
       Indebtedness and is not incurred pursuant to a registered offering of
       securities under the Securities Act or a private placement of securities
       (including under Rule 144A) pursuant to an exemption from the
       registration requirements of the Securities Act, which private placement
       provides for registration rights under the Securities Act (any guarantee
       excluded by operations of this clause (y) being an "EXCLUDED GUARANTEE").

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        (b) Notwithstanding the other provisions of this covenant and of the
    indenture, any Guarantee by a Restricted Subsidiary of the notes will
    provide by its terms that it will be automatically and unconditionally
    released and discharged upon:

           (1) any sale, exchange or transfer, to any Person not an Affiliate of
       Alliance, of all of Alliance's Capital Stock in, or all or substantially
       all the assets of, such Restricted Subsidiary (which sale, exchange or
       transfer is not prohibited by the indenture); or

           (2) the release or discharge of the guarantee which resulted in the
       creation of such Guarantee, except a discharge or release by or as a
       result of payment under such guarantee.

LIMITATION ON OTHER SENIOR SUBORDINATED INDEBTEDNESS

    Alliance will not, and will not permit any Guarantor to, directly or
indirectly, incur any Indebtedness (including Acquired Indebtedness) that is
subordinate in right of payment to any Indebtedness of Alliance or any
Indebtedness of any Guarantor, unless such Indebtedness is either:

        (a) PARI PASSU in right of payment with the notes or such Guarantor's
    Guarantee, as the case may be; or

        (b) subordinate in right of payment to the notes, or such Guarantor's
    Guarantee, as the case may be, in the same manner and at least to the same
    extent as the notes are subordinate to Senior Indebtedness or such
    Guarantor's Guarantee is subordinate to such Guarantor's Senior
    Indebtedness, as the case may be.

REPORTS AND OTHER INFORMATION

    Whether or not required by the Commission, so long as any notes are
outstanding, Alliance will file with the Commission and deliver to the trustee
and to each Holder of notes, within the time periods specified in the
Commissions rules and regulations, annual and quarterly reports and other
information, documents and reports specified in Section 13 or 15(d) of the
Exchange Act and applicable to a U.S. corporation subject to those sections;
PROVIDED, HOWEVER, that Alliance will not be obligated to file such information,
documents and reports with the Commission if the Commission does not permit
those filings.

EVENTS OF DEFAULT AND REMEDIES

    Each of the following is an Event of Default:

        (a) default in payment when due, upon redemption, acceleration or
    otherwise, of principal of, or premium, if any, on the notes, whether or not
    the payment is prohibited by the subordination provisions of the indenture;

        (b) default for 30 days or more in the payment when due of interest on
    the notes, whether or not the payment is prohibited by the subordination
    provisions of the indenture;

        (c) failure by Alliance or any Guarantor for 30 days after notice to
    comply with any of its other agreements in the indenture or the notes;

        (d) default under any mortgage, indenture or instrument under which
    there is issued or by which there is secured or evidenced any Indebtedness
    for money borrowed by Alliance or any of its Restricted Subsidiaries or the
    payment of which is guaranteed by Alliance or any of its Restricted
    Subsidiaries (other than Indebtedness owed to Alliance or a Restricted
    Subsidiary), whether such Indebtedness or guarantee now exists or is created
    after the date of the indenture, if both:

           (1) such default either:

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               (A) results from the failure to pay any such Indebtedness at its
           stated final maturity (after giving effect to any applicable grace
           periods); or

               (B) relates to an obligation other than the obligation to pay
           principal of any such Indebtedness at its stated final maturity and
           results in the holder or holders of such Indebtedness causing such
           Indebtedness to become due prior to its stated maturity; and

           (2) the principal amount of such Indebtedness, together with the
       principal amount of any other such Indebtedness in default for failure to
       pay principal at stated final maturity (after giving effect to any
       applicable grace periods), or the maturity of which has been so
       accelerated, aggregates $20 million or more;

        (e) failure by Alliance or any of its Significant Subsidiaries to pay
    final judgments aggregating in excess of $20 million, which final judgments
    remain unpaid, undischarged and unstayed for a period of more than 60 days;

        (f) certain events of bankruptcy or insolvency described in the
    indenture with respect to Alliance or any of its Significant Subsidiaries;
    or

        (g) any Guarantee ceases to be in full force and effect or is declared
    null and void or any responsible officer of Alliance or any Guarantor denies
    that it has any further liability under any Guarantee or gives notice to
    such effect (other than by reason of the termination of the indenture or the
    release of any such Guarantee in accordance with the indenture).

    If any event of default (other than of a type specified in clause (f) above)
occurs and is continuing under the indenture, the trustee or the Holders of at
least 30% in principal amount of the then outstanding notes may declare the
principal, premium, if any, interest and any other monetary obligations on all
the then outstanding notes to be due and payable immediately; PROVIDED, HOWEVER
that, so long as any Indebtedness permitted to be incurred pursuant to the
Credit Facility shall be outstanding, no such acceleration shall be effective
until the earlier of (x) acceleration of any such Indebtedness under the Credit
Facility or (y) five business days after the giving of written notice to
Alliance and the administrative agent under the Credit Facility of such
acceleration. Upon the effectiveness of such declaration, the principal and
interest on the notes will be due and payable immediately. Notwithstanding the
preceding, if an event of default arising under clause (f) of the first
paragraph of this section occurs with respect to the Company, all outstanding
notes will become due and payable without further action or notice.

    Holders of the notes may not enforce the indenture or the notes except as
provided in the indenture. Subject to limitations, Holders of a majority in
principal amount of the notes may direct the trustee in its exercise of any
trust or power. The trustee may withhold from Holders of notes notice of any
continuing default or event of default (except a default or event of default
relating to the payment of principal, premium, if any, or interest) if it
determines that withholding notice is in their interest.

    The Holders of a majority in aggregate principal amount of the notes may on
behalf of the Holders of all of the notes waive any existing default or event of
default and its consequences, except a continuing default or event of default in
the payment of interest on, premium, if any, or the principal of any note held
by a non-consenting Holder. In the event of any event of default specified in
clause (d) above, the event of default and all consequences thereof (including
any acceleration or resulting payment default) will be annulled, waived and
rescinded, automatically if, within 20 days after the event of default arose,
(i) the Indebtedness or guarantee that is the basis for such event of default
has been discharged, (ii) the holders of the Indebtedness or guarantee have
rescinded or waived the acceleration, notice or action, or (iii) the default
that is the basis for such event of default has been cured.

    Alliance is required to deliver to the trustee annually a statement
regarding compliance with the indenture, and Alliance is required, within five
business days, upon becoming aware of any default or

                                       93

event of default or any default under any document, instrument or agreement
representing Indebtedness of Alliance or any Guarantor, to deliver to the
trustee a statement specifying the default or event of default.

NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS

    No director, officer, employee, incorporator or stockholder of Alliance or
any Guarantor, as such, will have any liability for any obligations of Alliance
or the Guarantors under the notes, the Guarantees or the indenture or for any
claim based on, in respect of, or by reason of such obligations or their
creation. Each Holder of notes by accepting a note waives and releases all such
liability. The waiver and release are part of the consideration for issuance of
the notes. The waiver may not be effective to waive liabilities under the
federal securities laws.

LEGAL DEFEASANCE AND COVENANT DEFEASANCE

    Alliance may, at its option and at any time, elect to have all of its
obligations discharged with respect to the outstanding notes and have all
obligations of the Guarantors discharged with respect to their Guarantees
("LEGAL DEFEASANCE") except for:

        (a) the rights of Holders of outstanding notes to receive payments in
    respect of the principal of, premium, if any, and interest and on such notes
    when such payments are due from the trust referred to below;

        (b) Alliance's obligations with respect to notes concerning issuing
    temporary notes, registration of such notes, mutilated, destroyed, lost or
    stolen notes and the maintenance of an office or agency for payment and
    money for security payments held in trust;

        (c) the rights, powers, trusts, duties and immunities of the trustee,
    and Alliance's obligations in connection therewith; and

        (d) the Legal Defeasance provisions of the indenture.

    In addition, Alliance may, at its option and at any time, elect to have the
obligations of Alliance and the Guarantors released with respect to certain
covenants that are described in the indenture ("COVENANT DEFEASANCE") and
thereafter any omission to comply with those covenants will not constitute a
default or event of default with respect to the notes. In the event Covenant
Defeasance occurs, certain events (not including non-payment on other
indebtedness, bankruptcy, receivership, rehabilitation and insolvency events)
described under "Events of Default" will no longer constitute an event of
default with respect to the notes.

    In order to exercise either Legal Defeasance or Covenant Defeasance:

        (a) Alliance must irrevocably deposit with the trustee, in trust, for
    the benefit of the Holders of the notes, cash in U.S. dollars, non-callable
    Government Securities, or a combination of cash in U.S. dollars and
    non-callable Government Securities, in amounts as will be sufficient, in the
    opinion of a nationally recognized firm of independent public accountants,
    to pay the principal of and premium and interest, if any, due on the
    outstanding notes on the stated maturity date or on the applicable
    redemption date, as the case may be;

        (b) in the case of Legal Defeasance, Alliance has delivered to the
    trustee an opinion of counsel reasonably acceptable to the trustee
    confirming that, subject to customary assumptions and exclusions, (1)
    Alliance has received from, or there has been published by, the Internal
    Revenue Service a ruling or (2) since the date of the indenture, there has
    been a change in the applicable federal income tax law, in either case to
    the effect that, and based thereon such opinion of counsel shall confirm
    that, the Holders of the outstanding notes will not recognize income, gain
    or loss for federal income tax purposes as a result of such Legal Defeasance
    and will be subject to federal

                                       94

    income tax on the same amounts, in the same manner and at the same times as
    would have been the case if such Legal Defeasance had not occurred;

        (c) in the case of Covenant Defeasance, Alliance has delivered to the
    trustee an opinion of counsel reasonably acceptable to the trustee
    confirming that the Holders of the outstanding notes will not recognize
    income, gain or loss for federal income tax purposes as a result of such
    Covenant Defeasance and will be subject to federal income tax on the same
    amounts, in the same manner and at the same times as would have been the
    case if such Covenant Defeasance had not occurred;

        (d) no default or event of default shall have occurred and is continuing
    on the date of such deposit (other than a default or event of default
    resulting from the borrowing of funds to be applied to such deposit);

        (e) such Legal Defeasance or Covenant Defeasance will not result in a
    breach or violation of, or constitute a default under, any material
    agreement or instrument (other than the indenture) to which, Alliance or any
    Guarantor is a party or by which Alliance or any Guarantor is bound;

        (f) Alliance has delivered to the trustee an opinion of counsel to the
    effect that the trust funds will not be subject to the effect of any
    applicable bankruptcy, insolvency, reorganization or similar laws affecting
    creditors' rights generally under any applicable federal or state law, and
    that the trustee has a perfected security interest in the trust funds for
    the ratable benefit of the Holders of notes;

        (g) Alliance has delivered to the trustee an officers' certificate
    stating that the deposit was not made by Alliance with the intent of
    defeating, hindering, delaying or defrauding any creditors of Alliance or
    any Guarantor or others; and

        (h) Alliance has delivered to the trustee an officers' certificate and
    an opinion of counsel, each stating that all conditions precedent relating
    to the Legal Defeasance or the Covenant Defeasance have been complied with.

AMENDMENT, SUPPLEMENT AND WAIVER

    Except as provided in the next two succeeding paragraphs, the indenture, any
Guarantee and the notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the notes then
outstanding, including consents obtained in connection with a purchase of, or
tender offer or exchange offer for, notes, and any existing default or
compliance with any provision of the indenture or the notes may be waived with
the consent of the Holders of a majority in principal amount of the then
outstanding notes, including consents obtained in connection with a purchase of,
or tender offer or exchange offer for, notes.

    Without the consent of each Holder affected, an amendment or waiver may not
(with respect to any notes held by a non-consenting Holder of the notes):

        (a) reduce the principal amount of notes whose Holders must consent to
    an amendment, supplement or waiver;

        (b) reduce the principal of or change the fixed maturity of any such
    note or alter or waive the provisions with respect to the redemption of the
    notes (other than provisions relating to the covenants described above under
    the caption "Repurchase at the Option of Holders");

        (c) reduce the rate of or change the time for payment of interest on any
    note;

        (d) waive a default or event of default in the payment of principal of
    or premium, if any, or interest on the notes (except a rescission of
    acceleration of the notes by the Holders of at least a majority in aggregate
    principal amount of such notes and a waiver of the payment default that

                                       95

    resulted from such acceleration), or in respect of a covenant or provision
    contained in the indenture or any Guarantee which cannot be amended or
    modified without the consent of all Holders of notes;

        (e) make any note payable in money other than that stated in the notes;

        (f) make any change in the provisions of the indenture relating to
    waivers of past defaults or the rights of Holders of notes to receive
    payments of principal of or premium, if any, or interest on the notes;

        (g) make any change in this paragraph;

        (h) impair the right of any Holder of the notes to receive payment of
    principal of, or interest on, the Holder's notes on or after the due dates
    therefor or to institute suit for the enforcement of any payment on or with
    respect to the Holder's notes; or

        (i) make any change in the subordination provisions of the indenture
    that would adversely affect the Holders of the notes.

    Notwithstanding the preceding, without the consent of any Holder of notes,
Alliance, the Guarantors and the trustee may amend or supplement the indenture,
any Guarantee or the notes:

        (a) to cure any ambiguity, defect or inconsistency;

        (b) to provide for uncertificated notes in addition to or in place of
    certificated notes;

        (c) to comply with the covenant relating to mergers, consolidations and
    sales of assets to provide for the assumption of Alliance's or any
    Guarantor's obligations to Holders of such notes;

        (d) to provide for the assumption of Alliance's or any Guarantor's
    obligations to Holders of such notes;

        (e) to make any change that would provide any additional rights or
    benefits to the Holders of notes or that does not adversely affect the legal
    rights under the indenture of any Holder of the notes;

        (f) to add covenants for the benefit of the Holders or to surrender any
    right or power conferred upon Alliance;

        (g) to comply with the requirements of the Commission in order to effect
    or maintain the qualification of the indenture under the Trust Indenture
    Act;

        (h) to evidence and provide for the acceptance of appointment under the
    indenture by a successor trustee pursuant to the requirements of the
    indenture;

        (i) to add a Guarantor under the indenture or release a Guarantor from
    its Guarantee pursuant to the terms of the indenture; or

        (j) to make any change to the subordination provisions of the indenture
    that would limit or terminate the benefits available to any holder of Senior
    Indebtedness under those provisions, PROVIDED that if the rights of the
    holders of Senior Indebtedness are adversely affected, the holders of Senior
    Indebtedness must consent to the change.

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SATISFACTION AND DISCHARGE

    The indenture will be discharged and will cease to be of further effect as
to all notes issued thereunder, when:

        (a) either:

           (1) all notes that have been authenticated, except lost, stolen or
       destroyed notes that have been replaced or paid and notes for whose
       payment money has been deposited in trust and thereafter repaid to
       Alliance, have been delivered to the trustee for cancellation; or

           (2) all notes that have not been delivered to such trustee for
       cancellation have become due and payable by reason of the mailing of a
       notice of redemption or otherwise or will become due and payable within
       one year and Alliance or any Guarantor has irrevocably deposited or
       caused to be deposited with the trustee as trust funds in trust solely
       for the benefit of the holders, cash in U.S. dollars, non-callable
       Government Securities, or a combination of cash in U.S. dollars and
       non-callable Government Securities, in amounts as will be sufficient
       without consideration of any reinvestment of interest, to pay and
       discharge the entire indebtedness on the notes not delivered to the
       trustee for cancellation for principal, premium, if any, and accrued
       interest to the date of maturity or redemption;

        (b) no default or event of default with respect to the indenture or the
    notes has occurred and is continuing on the date of the deposit or will
    occur as a result of the deposit and the deposit will not result in a breach
    or violation of, or constitute a default under, any other instrument to
    which Alliance or any Guarantor is a party or by which Alliance or any
    Guarantor is bound;

        (c) Alliance or any Guarantor has paid or caused to be paid all sums
    payable by it under the indenture; and

        (d) Alliance has delivered irrevocable instructions to the trustee under
    the indenture to apply the deposited money toward the payment of the notes
    at maturity or the redemption date, as the case may be.

    In addition, Alliance must deliver an officers' certificate and an opinion
of counsel to the trustee stating that all conditions precedent to satisfaction
and discharge have been satisfied.

CONCERNING THE TRUSTEE

    If the trustee becomes a creditor of Alliance, the indenture limits its
right to obtain payment of claims in certain cases, or to realize on certain
property received in respect of any such claim as security or otherwise. The
trustee will be permitted to engage in other transactions; however, if it
acquires any conflicting interest it must eliminate such conflict within 90
days, apply to the Commission for permission to continue or resign.

    The Holders of a majority in principal amount of the notes will have the
right to direct the time, method and place of conducting any proceeding for
exercising any remedy available to the trustee, subject to certain exceptions.
The indenture provides that in case an event of default occurs and is
continuing, the trustee will be required, in the exercise of its power, to use
the degree of care of a prudent man in the conduct of his own affairs. Subject
to such provisions, the trustee will be under no obligation to exercise any of
its rights or powers under the indenture at the request of any Holder of notes,
unless such Holder has offered to the trustee security and indemnity
satisfactory to it against any loss, liability or expense.

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BOOK-ENTRY, DELIVERY AND FORM

    The exchange notes will be issued in the form of one or more global notes.
The global notes will be deposited with, or on behalf of, The Depository Trust
Company ("DTC") and registered in the name of DTC or its nominee, who will be
the global notes holder. Except as set forth below, the global notes may be
transferred, in whole and not in part, only to DTC or another nominee of DTC.
Investors may hold their beneficial interests in the global notes directly
through DTC if they are participating organizations or "participants" in such
system or indirectly through organizations that are participants in such system.

DEPOSITORY PROCEDURES

    DTC has advised Alliance that DTC is a limited-purpose trust company that
was created to hold securities for its participants and to facilitate the
clearance and settlement of transactions in such securities between participants
through electronic book-entry changes in accounts of its participants. The
participants include securities brokers and dealers (including the initial
purchasers), banks and trust companies, clearing corporations and certain other
organizations. Access to DTC's system is also available to other entities such
as banks, brokers, dealers and trust companies, which we refer to as "indirect
participants," that clear through or maintain a custodial relationship with a
participant, either directly or indirectly. Persons who are not participants may
beneficially own securities held by or on behalf of DTC only through the
participants or the indirect participants. Alliance expects that pursuant to
procedures established by DTC:

        (a) upon deposit of the global notes, DTC will credit the accounts of
    participants designated by the exchange agent with portions of the principal
    amount of the global notes; and

        (b) ownership of the exchange notes evidenced by the global notes will
    be shown on, and the transfer of ownership thereof will be effected only
    through, records maintained by DTC (with respect to the interests of the
    participants), the participants and the indirect participants.

    So long as the global notes holder is the registered owner of any exchange
notes, the global notes holder will be considered the sole holder under the
indenture of any exchange notes evidenced by the global notes. Beneficial owners
of exchange notes evidenced by the global notes will not be considered the
owners or holders thereof under the indentures for any purpose, including with
respect to the giving of any directions, instructions or approvals to the
trustee thereunder. Neither Alliance nor the applicable trustee will have any
responsibility or liability for any aspect of the records of DTC or for
maintaining, supervising or reviewing any records of DTC relating to the
exchange notes.

    Payments in respect of the principal of, premium, if any, and interest, if
any, on any exchange notes registered in the name of the global notes holder on
the applicable record date will be payable by the applicable trustee to or at
the direction of the global notes holder in its capacity as the registered
holder under the indenture. Under the terms of the indenture, Alliance and the
applicable trustee may treat the persons in whose names exchange notes,
including the global notes, are registered as the owners thereof for the purpose
of receiving such payments. Consequently, neither Alliance nor the applicable
trustee has or will have any responsibility or liability for the payment of such
amounts to beneficial owners of exchange notes. Alliance believes, however, that
it is currently the policy of DTC to immediately credit the accounts of the
relevant participants with such payments, in amounts proportionate to their
respective holdings of beneficial interests in the relevant security as shown on
the records of DTC. Payments by the participants and the indirect participants
to the beneficial owners of exchange notes will be governed by standing
instructions and customary practice and will be the responsibility of the
participants or the indirect participants.

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CERTIFICATED SECURITIES

    Subject to certain conditions, any person having a beneficial interest in a
global note may, upon request to the trustee, exchange such beneficial interest
for exchange notes in the form of certificated securities. Upon any such
issuance, the trustee is required to register such certificated securities in
the name of, and cause the same to be delivered to, such person or persons (or
the nominee of any thereof). In addition, if:

        (a) Alliance notifies the trustee in writing that DTC is no longer
    willing or able to act as a depositary and Alliance is unable to locate a
    qualified successor within 90 days; or

        (b) Alliance, at its option, notifies the trustee in writing that it
    elects to cause the issuance of exchange notes in the form of certificated
    securities under the indenture,

then, upon surrender by the global notes holder of its global notes, exchange
notes in such form will be issued to each person that the global notes holder
and DTC identify as being the beneficial owner of the related exchange notes.

    Neither Alliance nor the trustee will be liable for any delay by the global
notes holder or DTC in identifying the beneficial owners of exchange notes and
Alliance and the trustee may conclusively rely on, and will be protected in
relying on, instructions from the global notes holder or DTC for all purposes.

SAME DAY SETTLEMENT AND PAYMENT

    Alliance will make payments in respect of the exchange notes represented by
the global notes (including principal, premium, if any, and interest, if any) by
wire transfer of immediately available funds to the accounts specified by the
holder of the global note. Alliance will make all payments of principal,
interest and premium, if any, with respect to certificated notes by wire
transfer of immediately available funds to the accounts specified by the holders
of the certificated notes or, if no such account is specified, by mailing a
check to each such holder's registered address. Alliance expects that secondary
trading in the certificated notes will also be settled in immediately available
funds.

GOVERNING LAW

    The indenture, the notes and the Guarantees, if any, will be, subject to
certain exceptions, governed by and construed in accordance with the internal
laws of the State of New York, without regard to the choice of law rules
thereof.

ADDITIONAL INFORMATION

    Anyone who receives this prospectus may obtain a copy of the indenture and
the registration rights agreement without charge by writing to Alliance Imaging,
Inc. at 1065 PacifiCenter Drive, Suite 200, Anaheim, CA 92806, Attention:
Secretary.

CERTAIN DEFINITIONS

    Set forth below are certain defined terms used in the indenture. Reference
is made to the indenture for a full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.

    "ACQUIRED INDEBTEDNESS" means, with respect to any specified Person:

        (a) Indebtedness of any other Person existing at the time such other
    Person is merged with or into or became a Restricted Subsidiary of such
    specified Person, including, without limitation, Indebtedness incurred in
    connection with, or in contemplation of, such other Person merging with or
    into or becoming a Restricted Subsidiary of such specified Person; and

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        (b) Indebtedness secured by a Lien encumbering any asset acquired by
    such specified Person.

    "AFFILIATE" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "CONTROL"
(including, with correlative meanings, the terms "CONTROLLING," "CONTROLLED BY"
and "UNDER COMMON CONTROL WITH"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise; PROVIDED, HOWEVER,
that beneficial ownership of 10% or more of the voting securities of a Person
shall be deemed to be control.

    "APPLICABLE PREMIUM" means, with respect to any note on any redemption date,
the greater of (i) 1.0% of the principal amount of such note or (ii) the excess
of (A) the present value at such redemption date of (1) the redemption price of
such note at April 15, 2006 (such redemption price being set forth in the table
above) plus (2) all required interest payments due on such note through April
15, 2006 (excluding accrued but unpaid interest), computed using a discount rate
equal to the Treasury Rate on such redemption date plus 75 basis points over (B)
the principal amount of such note.

    "ASSET SALE" means:

        (a) the sale, conveyance, transfer or other disposition (whether in a
    single transaction or a series of related transactions) of property or
    assets (including by way of a sale and leaseback) of Alliance or any
    Restricted Subsidiary (each referred to in this definition as a
    "DISPOSITION"); or

        (b) the issuance or sale of Equity Interests of any Restricted
    Subsidiary (whether in a single transaction or a series of related
    transactions),

    in each case, other than:

           (1) a disposition of Cash Equivalents or Investment Grade Securities
       or obsolete equipment in the ordinary course of business;

           (2) the disposition of all or substantially all of the assets of
       Alliance in a manner permitted pursuant to the provisions described above
       under "--Merger, Consolidation or Sale of All or Substantially All
       Assets" or any disposition that constitutes a Change of Control pursuant
       to the indenture;

           (3) any Restricted Payment that is permitted to be made, and is made,
       under the first paragraph of the covenant described above under
       "--Limitation on Restricted Payments";

           (4) any disposition of assets with an aggregate fair market value of
       less than $2 million;

           (5) any disposition of property or assets by a Restricted Subsidiary
       to Alliance or by Alliance or a Restricted Subsidiary to a Wholly Owned
       Restricted Subsidiary;

           (6) any exchange of like property pursuant to Section 1031 of the
       Internal Revenue Code of 1986, as amended, for use in a Similar Business;

           (7) any financing transaction with respect to property built or
       acquired by Alliance or any Restricted Subsidiary after the date of the
       indenture including, without limitation, sale-leasebacks and asset
       securitizations;

           (8) foreclosures on assets;

           (9) sales of accounts receivable, or participations therein, in
       connection with any Receivables Facility;

           (10) any sale of Equity Interests in, or Indebtedness or other
       securities of, an Unrestricted Subsidiary;

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           (11) any sale of an imaging or therapeutic system to any original
       manufacturer of imaging or therapeutic systems in exchange for a credit
       from such manufacturer against the purchase of a replacement or alternate
       imaging or therapeutic system; and

           (12) any sale of an imaging or therapeutic system pursuant to an
       arrangement with a client of Alliance or one of its Restricted
       Subsidiaries; provided that (i) any such system was purchased by Alliance
       or such Restricted Subsidiary within the 90 days prior to the date of
       such sale and (ii) Alliance or such Restricted Subsidiary receives net
       cash proceeds in connection with the sale in an amount equal to or
       greater than the amount it paid for such system.

    "CAPITALIZED LEASE OBLIGATION" means, at the time any determination thereof
is to be made, the amount of the liability in respect of a capital lease that
would at such time be required to be capitalized and reflected as a liability on
a balance sheet (excluding the footnotes thereto) in accordance with GAAP.

    "CAPITAL STOCK" means:

        (a) in the case of a corporation, corporate stock;

        (b) in the case of an association or business entity, any and all
    shares, interests, participations, rights or other equivalents (however
    designated) of corporate stock;

        (c) in the case of a partnership or limited liability company,
    partnership or membership interests (whether general or limited); and

        (d) any other interest or participation that confers on a Person the
    right to receive a share of the profits and losses of, or distributions of
    assets of, the issuing Person.

    "CASH EQUIVALENTS" means:

        (a) U.S. dollars;

        (b) securities issued or directly and fully guaranteed or insured by the
    U.S. Government or any agency or instrumentality thereof;

        (c) certificates of deposit, time deposits and eurodollar time deposits
    with maturities of one year or less from the date of acquisition, bankers'
    acceptances with maturities not exceeding one year and overnight bank
    deposits, in each case with any commercial bank having capital and surplus
    in excess of $ 250.0 million;

        (d) repurchase obligations for underlying securities of the types
    described in clauses (b) and (c) entered into with any financial institution
    meeting the qualifications specified in clause (c) above;

        (e) commercial paper rated A-1 or the equivalent thereof by Moody's or
    S&P and in each case maturing within one year after the date of acquisition;

        (f) investment funds investing at least 95% of their assets in
    securities of the types described in clauses (a)-(e) above;

        (g) readily marketable direct obligations issued by any state of the
    United States of America or any political subdivision thereof having one of
    the two highest rating categories obtainable from either Moody's or S&P; and

        (h) Indebtedness or preferred stock issued by Persons with a rating of
    "A" or higher from S&P or "A2" or higher from Moody's.

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    "CHANGE OF CONTROL" means the occurrence of any of the following:

        (a) the sale, lease or transfer, in one or a series of related
    transactions, of all or substantially all of the assets of Alliance and its
    Subsidiaries, taken as a whole; or

        (b) Alliance becomes aware of (by way of a report or any other filing
    pursuant to Section 13(d) of the Exchange Act, proxy, vote, written notice
    or otherwise) the acquisition by any Person or group (within the meaning of
    Section 13(d)(3) or Section 14(d)(2) of the Exchange Act, or any successor
    provision), including any group acting for the purpose of acquiring, holding
    or disposing of securities (within the meaning of Rule 13d-5(b)(1) under the
    Exchange Act), other than the Permitted Holders and their Related Parties,
    in a single transaction or in a related series of transactions, by way of
    merger, consolidation or other business combination or purchase of
    beneficial ownership (within the meaning of Rule 13d-3 under the Exchange
    Act, or any successor provision) of 50% or more of the total voting power of
    the Voting Stock of Alliance.

    The definition of Change of Control includes a phrase relating to the sale,
lease, transfer, conveyance or other disposition of "all or substantially all"
of the assets of Alliance and its Subsidiaries (determined on a consolidated
basis). Although there is a developing body of case law interpreting the phrase
"substantially all," there is no precise established definition of the phrase
under applicable law. Accordingly, the ability of a Holder of notes to require
Alliance to repurchase such notes as a result of a sale, lease, transfer,
conveyance or other disposition of less than all of the assets of Alliance and
its Subsidiaries taken as a whole to another Person or group may be uncertain.

    "CONSOLIDATED DEPRECIATION AND AMORTIZATION EXPENSE" means with respect to
any Person for any period, the total amount of depreciation and amortization
expense of such Person and its Restricted Subsidiaries for such period on a
consolidated basis and otherwise determined in accordance with GAAP.

    "CONSOLIDATED INTEREST EXPENSE" means, with respect to any period, the sum,
without duplication, of:

        (a) consolidated interest expense of such Person and its Restricted
    Subsidiaries for such period, to the extent such expense was deducted in
    computing Consolidated Net Income (including amortization of original issue
    discount, non-cash interest payments, the interest component of Capitalized
    Lease Obligations, and net payments and receipts (if any) pursuant to
    Hedging Obligations to the extent included in Consolidated Interest Expense,
    excluding amortization of deferred financing fees); and

        (b) consolidated capitalized interest of such Person and its Restricted
    Subsidiaries for such period, whether paid or accrued;

PROVIDED, HOWEVER, that Receivables Fees shall be deemed not to constitute
Consolidated Interest Expense.

    "CONSOLIDATED NET INCOME" means, with respect to any Person for any period,
the aggregate of the Net Income, of such Person and its Restricted Subsidiaries
for such period, on a consolidated basis, and otherwise determined in accordance
with GAAP; PROVIDED, HOWEVER, that:

        (a) any net after-tax extraordinary or nonrecurring gains or losses
    (less all fees and expenses relating thereto) shall be excluded;

        (b) the Net Income for such period shall not include the cumulative
    effect of a change in accounting principles during such period;

        (c) any net after-tax income (loss) from discontinued operations and any
    net after-tax gains or losses on disposal of discontinued operations shall
    be excluded;

                                      102

        (d) any net after-tax gains or losses (less all fees and expenses
    relating thereto) attributable to asset dispositions other than in the
    ordinary course of business (as determined in good faith by the board of
    directors of Alliance) shall be excluded;

        (e) the Net Income for such period of any Person that is not a
    Subsidiary, or is an Unrestricted Subsidiary, or that is accounted for by
    the equity method of accounting, shall be included only to the extent of the
    amount of dividends or distributions or other payments paid in cash (or to
    the extent converted into cash) to the referent Person or a Wholly Owned
    Restricted Subsidiary thereof in respect of such period;

        (f) for purposes of the covenant described under "--Limitation on
    Restricted Payments" only, the Net Income of any Person acquired in a
    pooling of interests transaction shall not be included for any period prior
    to the date of such acquisition; and

        (g) the Net Income for such period of any Restricted Subsidiary shall be
    excluded to the extent that the declaration or payment of dividends or
    similar distributions by that Restricted Subsidiary of its Net Income is not
    at the date of determination permitted without any prior governmental
    approval (which has not been obtained) or, directly or indirectly, by the
    operation of the terms of its charter or any agreement, instrument,
    judgment, decree, order, statute, rule, or governmental regulation
    applicable to that Restricted Subsidiary or its stockholders, unless such
    restriction with respect to the payment of dividends or in similar
    distributions has been legally waived.

    "CONTINGENT OBLIGATIONS" means, with respect to any Person, any obligation
of such Person guaranteeing any leases, dividends or other obligations that do
not constitute Indebtedness ("PRIMARY OBLIGATIONS") of any other Person (the
"PRIMARY OBLIGOR") in any manner, whether directly or indirectly, including,
without limitation, any obligation of such Person, whether or not contingent:

        (a) to purchase any such primary obligation or any property constituting
    direct or indirect security therefor;

        (b) to advance or supply funds:

           (1) for the purchase or payment of any such primary obligation; or

           (2) to maintain working capital or equity capital of the primary
       obligor or otherwise to maintain the net worth or solvency of the primary
       obligor; or

        (c) to purchase property, securities or services primarily for the
    purpose of assuring the owner of any such primary obligation of the ability
    of the primary obligor to make payment of such primary obligation against
    loss in respect thereof.

    "CREDIT FACILITIES" means, with respect to Alliance, one or more debt
facilities (including, without limitation, the Credit Facility) or commercial
paper facilities with banks or other institutional lenders providing for
revolving credit loans, term loans, receivables financing (including through the
sale of receivables to such lenders or to special purpose entities formed to
borrow from such lenders against such receivables) or letters of credit, in each
case, as amended, restated, modified, renewed, refunded, replaced or refinanced
in whole or in part from time to time.

    "DESIGNATED NONCASH CONSIDERATION" means the fair market value of noncash
consideration received by Alliance or one of its Restricted Subsidiaries in
connection with an Asset Sale that is so designated as Designated Noncash
Consideration pursuant to an officers' certificate, setting forth the basis of
such valuation, executed by the principal executive officer and the principal
financial officer of Alliance, less the amount of cash or Cash Equivalents
received in connection with a sale of such Designated Noncash Consideration.

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    "DESIGNATED PREFERRED STOCK" means preferred stock of Alliance (other than
Disqualified Stock) that is issued for cash (other than to a Restricted
Subsidiary) and is so designated as Designated Preferred Stock, pursuant to an
officers' certificate executed by the principal executive officer and the
principal financial officer of Alliance, on the issuance date thereof, the cash
proceeds of which are excluded from the calculation set forth in clause (3) of
the covenant described under "--Limitation on Restricted Payments."

    "DESIGNATED SENIOR INDEBTEDNESS" means:

        (1) Senior Indebtedness under the Credit Facility; and

        (2) any other Senior Indebtedness permitted under the indenture the
    principal amount of which is $50 million or more and that has been
    designated by Alliance as Designated Senior Indebtedness.

    "DISQUALIFIED STOCK" means, with respect to any Person, any Capital Stock of
such Person which, by its terms (or by the terms of any security into which it
is convertible or for which it is putable or exchangeable), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the holder
thereof, in whole or in part, in each case prior to the date 91 days after the
maturity date of the notes; PROVIDED, HOWEVER, that if such Capital Stock is
issued to any employee or to any plan for the benefit of employees of Alliance
or its Subsidiaries or by any such plan to such employees, such Capital Stock
shall not constitute Disqualified Stock solely because it may be required to be
repurchased by Alliance in order to satisfy applicable statutory or regulatory
obligations, PROVIDED, FURTHER, that any Capital Stock that would constitute
Disqualified Stock solely because the holders thereof (or of any security into
which it is convertible or for which it is exchangeable) have the right to
require the issuer to repurchase such Capital Stock (or such security into which
it is convertible or for which it is exchangeable) upon the occurrence of any of
the events constituting an Asset Sale or a Change of Control shall not
constitute Disqualified Stock if such Capital Stock (and all such securities
into which it is convertible or for which it is exchangeable) provides that the
issuer thereof will not repurchase or redeem any such Capital Stock (or any such
security into which it is convertible or for which it is exchangeable) pursuant
to such provisions prior to compliance by Alliance with the provisions of the
indenture described under the caption "Repurchase at the Option of
Holders--Change of Control" or "Repurchase at the Option of Holders--Asset
Sales," as the case may be.

    "EBITDA" means, with respect to any Person for any period, the Consolidated
Net Income of such Person for such period PLUS to the extent included in the
calculation of such Consolidated Net Income

        (a) provision for taxes based on income or profits of such Person for
    such period, PLUS

        (b) Consolidated Interest Expense of such Person for such period and any
    Receivables Fees paid by such Person or any of its Restricted Subsidiaries
    during such period, PLUS

        (c) Consolidated Depreciation and Amortization Expense of such Person
    for such period, including amortization of deferred financing fees, PLUS

        (d) any expenses or charges related to any Equity Offering, Permitted
    Investment or Indebtedness permitted to be incurred by the indenture or any
    costs incurred in the cancellation of stock options, PLUS

        (e) the amount of any restructuring charge, PLUS

        (f) without duplication, any other non-cash charges (excluding any such
    charge which requires an accrual of a cash reserve for anticipated cash
    charges for any future period), PLUS

        (g) minority interest expense, LESS

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        (h) without duplication, non-cash items (excluding any items which
    represent the reversal of any accrual of, or cash reserve for, anticipated
    cash charges in any prior period).

    "EQUITY INTERESTS" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

    "EQUITY OFFERING" means any public or private sale of common stock or
preferred stock of Alliance (excluding Disqualified Stock), other than:

        (a) public offerings with respect to Alliance's common stock registered
    on Form S-8; and

        (b) any such public or private sale that constitutes an Excluded
    Contribution.

    "EXCLUDED CONTRIBUTIONS" means the net cash proceeds received by Alliance
after the date of the indenture from:

        (a) contributions to its equity capital other than contributions from
    the issuance of Disqualified Stock; and

        (b) the sale (other than to a Subsidiary or to any Alliance or
    Subsidiary management equity plan or stock option plan or any other
    management or employee benefit plan or agreement) of Capital Stock (other
    than Disqualified Stock) of Alliance,

in each case designated as Excluded Contributions pursuant to an officers'
certificate executed by the principal executive officer and the principal
financial officer of Alliance on the date such capital contributions are made or
the date such Equity Interests are sold, as the case may be, the cash proceeds
of which are excluded from the calculation set forth in paragraph (3) of the
"--Limitation on Restricted Payments" covenant.

    "EXISTING INDEBTEDNESS" means Indebtedness of Alliance or its Restricted
Subsidiaries in existence on the date of the indenture, plus interest accruing
thereon, after application of the net proceeds of the sale of the notes as
described in this offering memorandum.

    "FIXED CHARGE COVERAGE RATIO" means, with respect to any Person for any
period, the ratio of EBITDA of such Person for such period to the Fixed Charges
of such Person for such period. In the event that Alliance or any of its
Restricted Subsidiaries incurs, assumes, guarantees or redeems any Indebtedness
(other than in the case of (i) revolving credit borrowings, in which case
interest expense shall be computed based upon the average daily balance of such
Indebtedness during the applicable period and (ii) capitalized leases related to
imaging or therapeutic systems, in which case imputed interest expense shall be
computed from the date of such capitalized lease) or issues or redeems preferred
stock subsequent to the commencement of the period for which the Fixed Charge
Coverage Ratio is being calculated but prior to the event for which the
calculation of the Fixed Charge Coverage Ratio is made (the "CALCULATION DATE"),
then the Fixed Charge Coverage Ratio shall be calculated giving pro forma effect
to such incurrence, assumption, guarantee or redemption of Indebtedness, or such
issuance or redemption of preferred stock, plus the application of any proceeds
therefrom as if the same had occurred at the beginning of the applicable
four-quarter period. For purposes of making the computation referred to above,
Investments, acquisitions, dispositions, mergers, consolidations and
discontinued operations (as determined in accordance with GAAP) that have been
made by Alliance or any of its Restricted Subsidiaries during the four-quarter
reference period or subsequent to such reference period and on or prior to or
simultaneously with the Calculation Date shall be calculated on a pro forma
basis assuming that all such Investments, acquisitions, dispositions,
discontinued operations, mergers and consolidations (and the reduction of any
associated fixed charge obligations and the change in EBITDA resulting
therefrom) had occurred on the first day of the four-quarter reference period.
If since the beginning of such period any Person (that subsequently became a
Restricted Subsidiary or was merged with or into Alliance or any Restricted
Subsidiary since the beginning of such period) shall have made any Investment,
acquisition, disposition, discontinued

                                      105

operation, merger or consolidation that would have required adjustment pursuant
to this definition, then the Fixed Charge Coverage Ratio shall be calculated
giving pro forma effect thereto for such period as if such Investment,
acquisition, disposition, discontinued operation, merger or consolidation had
occurred at the beginning of the applicable four-quarter period. For purposes of
this definition, whenever pro forma effect is to be given to a transaction, the
pro forma calculations shall be made in good faith by a responsible financial or
accounting officer of Alliance. If any Indebtedness bears a floating rate of
interest and is being given pro forma effect, the interest on such Indebtedness
shall be calculated as if the rate in effect on the Calculation Date had been
the applicable rate for the entire period (taking into account any Hedging
Obligations applicable to such Indebtedness). Interest on a Capitalized Lease
Obligation shall be deemed to accrue at an interest rate reasonably determined
by a responsible financial or accounting officer of Alliance to be the rate of
interest implicit in such Capitalized Lease Obligation in accordance with GAAP.
For purposes of making the computation referred to above, interest on any
Indebtedness under a revolving credit facility computed on a pro forma basis
shall be computed based upon the average daily balance of such Indebtedness
during the applicable period. Interest on Indebtedness that may optionally be
determined at an interest rate based upon a factor of a prime or similar rate, a
eurocurrency interbank offered rate, or other rate, shall be deemed to have been
based upon the rate actually chosen, or, if none, then based upon such optional
rate chosen as Alliance may designate. "Fixed Charges" means, with respect to
any Person for any period, the sum of (a) Consolidated Interest Expense of such
Person for such period and (b) all cash dividend payments (excluding items
eliminated in consolidation) on any series of preferred stock of such Person.

    "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect on the date of the indenture. For the purposes
of the indenture, the term "consolidated" with respect to any Person shall mean
such Person consolidated with its Restricted Subsidiaries, and shall not include
any Unrestricted Subsidiary.

    "GOVERNMENT SECURITIES" means securities that are:

        (a) direct obligations of the United States of America for the timely
    payment of which its full faith and credit is pledged; or

        (b) obligations of a Person controlled or supervised by and acting as an
    agency or instrumentality of the United States of America the timely payment
    of which is unconditionally guaranteed as a full faith and credit obligation
    by the United States of America,

which, in either case, are not callable or redeemable at the option of the
issuer thereof, and shall also include a depository receipt issued by a bank (as
defined in Section 3(a)(2) of the Securities Act), as custodian with respect to
any such Government Securities or a specific payment of principal of or interest
on any such Government Securities held by such custodian for the account of the
holder of such depository receipt; PROVIDED that (except as required by law)
such custodian is not authorized to make any deduction from the amount payable
to the holder of such depository receipt from any amount received by the
custodian in respect of the Government Securities or the specific payment of
principal of or interest on the Government Securities evidenced by such
depository receipt.

    "GUARANTEE" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, letters of credit and
reimbursement agreements in respect thereof), of all or any part of any
Indebtedness or other obligations.

    "GUARANTEE" means any guarantee of the obligations of Alliance under the
indenture and the notes by any Person in accordance with the provisions of the
indenture. When used as a verb, "Guarantee"

                                      106

shall have a corresponding meaning. No Guarantees will be issued in connection
with the initial offering and sale of the old notes or will be issued in
connection with the issuance of the exchange notes.

    "GUARANTOR" means any Person that incurs a Guarantee; PROVIDED that upon the
release and discharge of such Person from its Guarantee in accordance with the
indenture, such Person shall cease to be a Guarantor. No Guarantees will be
issued in connection with the initial offering and sale of the old notes or will
be issued in connection with the issuance of the exchange notes.

    "HEDGING OBLIGATIONS" means, with respect to any Person, the obligations of
such Person under

        (a) currency exchange or interest rate swap agreements, currency
    exchange or interest rate cap agreements and currency exchange or interest
    rate collar agreements and

        (b) other agreements or arrangements designed to protect such Person
    against fluctuations in currency exchange or interest rates.

    "INDEBTEDNESS" means, with respect to any Person:

        (a) any indebtedness of such Person, whether or not contingent:

           (1) in respect of borrowed money;

           (2) evidenced by bonds, notes, debentures or similar instruments or
       letters of credit or bankers' acceptances (or, without double counting,
       reimbursement agreements in respect thereof);

           (3) representing the balance deferred and unpaid of the purchase
       price of any property (including Capitalized Lease Obligations), except
       any such balance that constitutes a trade payable or similar obligation
       to a trade creditor, in each case accrued in the ordinary course of
       business; or

           (4) representing any Hedging Obligations, if and to the extent of any
       of the foregoing Indebtedness (other than letters of credit and Hedging
       Obligations) that would appear as a liability upon a balance sheet
       (excluding the footnotes thereto) of such Person prepared in accordance
       with GAAP;

        (b) to the extent not otherwise included, any obligation by such Person
    to be liable for, or to pay, as obligor, guarantor or otherwise, on the
    Indebtedness of another Person (other than by endorsement of negotiable
    instruments for collection in the ordinary course of business); and

        (c) to the extent not otherwise included, Indebtedness of another Person
    secured by a Lien on any asset owned by such Person (whether or not such
    Indebtedness is assumed by such Person);

PROVIDED, HOWEVER, that Contingent Obligations incurred in the ordinary course
of business shall be deemed not to constitute Indebtedness and obligations under
or in respect of Receivables Facilities shall not be deemed to constitute
Indebtedness of a Person.

    "INDEPENDENT FINANCIAL ADVISOR" means an accounting, appraisal, investment
banking firm or consultant to Persons engaged in Similar Businesses of
nationally recognized standing that is, in the judgment of Alliance's board of
directors, as evidenced by a board resolution, qualified to perform the task for
which it has been engaged, provided that such firm or consultant is not an
Affiliate of the Company.

    "INVESTMENT GRADE SECURITIES" means:

        (a) securities issued or directly and fully guaranteed or insured by the
    United States government or any agency or instrumentality thereof (other
    than Cash Equivalents);

                                      107

        (b) debt securities or debt instruments with a rating of BBB- or higher
    by S&P or Baa3 or higher by Moody's or the equivalent of such rating by such
    rating organization, or, if no rating of S&P or Moody's then exists, the
    equivalent of such rating by any other nationally recognized securities
    rating agency, but excluding any debt securities or instruments constituting
    loans or advances among Alliance and its Subsidiaries; and

        (c) investments in any fund that invests exclusively in investments of
    the type described in clauses (a) and (b) which fund may also hold
    immaterial amounts of cash pending investment and/ or distribution.

    "INVESTMENTS" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the form of loans (including
guarantees), advances or capital contributions (excluding advances to customers,
commission, travel and similar advances to officers and employees made in the
ordinary course of business), purchases or other acquisitions for consideration
of Indebtedness, Equity Interests or other securities issued by any other Person
and investments that are required by GAAP to be classified on the balance sheet
(excluding the footnotes thereto) of Alliance in the same manner as the other
investments included in this definition to the extent such transactions involve
the transfer of cash or other property. For purposes of the definition of
"Unrestricted Subsidiary" and the covenant described under "--Certain
Covenants--Limitation on Restricted Payments,"

        (a) "INVESTMENTS" shall include the portion (proportionate to Alliance's
    equity interest in such Subsidiary) of the fair market value of the net
    assets of a Subsidiary of Alliance at the time that such Subsidiary is
    designated an Unrestricted Subsidiary; PROVIDED, HOWEVER, that upon a
    redesignation of such Subsidiary as a Restricted Subsidiary, Alliance shall
    be deemed to continue to have a permanent "INVESTMENT" in an Unrestricted
    Subsidiary equal to an amount (if positive) equal to

           (1) Alliance's "INVESTMENT" in such Subsidiary at the time of such
       redesignation less

           (2) the portion (proportionate to Alliance's equity interest in such
       Subsidiary) of the fair market value of the net assets of such Subsidiary
       at the time of such redesignation; and

        (b) any property transferred to or from an Unrestricted Subsidiary shall
    be valued at its fair market value at the time of such transfer, in each
    case as determined in good faith by the board of directors of Alliance.

    "KKR" means Kohlberg Kravis Roberts & Co., L.P., a Delaware limited
partnership.

    "LIEN" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind in respect of such asset, whether
or not filed, recorded or otherwise perfected under applicable law (including
any conditional sale or other title retention agreement, any lease in the nature
thereof, any option or other agreement to sell or give a security interest in
and any filing of or agreement to give any financing statement under the Uniform
Commercial Code (or equivalent statutes) of any jurisdiction); PROVIDED that in
no event shall an operating lease be deemed to constitute a Lien.

    "MANAGEMENT GROUP" means the group consisting of the Officers of Alliance.

    "MOODY'S" means Moody's Investors Service, Inc.

    "NET INCOME" means, with respect to any Person, the net income (loss) of
such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends.

    "NET PROCEEDS" means the aggregate cash proceeds received by Alliance or any
of its Restricted Subsidiaries in respect of any Asset Sale (including, without
limitation, any cash received upon the sale or other disposition of any
Designated Noncash Consideration received in any Asset Sale), net of the

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direct costs relating to such Asset Sale and the sale or disposition of such
Designated Noncash Consideration (including, without limitation, legal,
accounting and investment banking fees, and brokerage and sales commissions),
and any relocation expenses incurred as a result thereof, taxes paid or payable
as a result thereof (after taking into account any available tax credits or
deductions and any tax sharing arrangements related thereto), amounts required
to be applied to the repayment of principal, premium (if any) and interest on
Indebtedness required (other than required by clause (a) of the second paragraph
of "--Repurchase at the Option of Holders--Asset Sales") to be paid as a result
of such transaction and any deduction of appropriate amounts to be provided by
Alliance as a reserve in accordance with GAAP against any liabilities associated
with the asset disposed of in such transaction and retained by Alliance after
such sale or other disposition thereof, including, without limitation, pension
and other post-employment benefit liabilities and liabilities related to
environmental matters or against any indemnification obligations associated with
such transaction.

    "OBLIGATIONS" means any principal, interest, penalties, fees,
indemnifications, reimbursements (including, without limitation, reimbursement
obligations with respect to letters of credit and banker's acceptances), damages
and other liabilities payable under the documentation governing any
Indebtedness.

    "OFFICER" means the Chairman of the Board, the President, any Executive Vice
President, Senior Vice President or Vice President, the Treasurer or the
Secretary of Alliance.

    "PARI PASSU INDEBTEDNESS" means:

        (a) with respect to the notes, Indebtedness which ranks PARI PASSU in
    right of payment to the notes; and

        (b) with respect to any Guarantee, Indebtedness which ranks PARI PASSU
    in right of payment to such Guarantee.

    "PERMITTED HOLDERS" means KKR and any of its Affiliates and the Management
Group.

    "PERMITTED INVESTMENTS" means:

        (a) any Investment in Alliance or any Restricted Subsidiary;

        (b) any Investment in cash and Cash Equivalents or Investment Grade
    Securities;

        (c) any Investment by Alliance or any Restricted Subsidiary of Alliance
    in a Person that is a Similar Business if as a result of such Investment:

           (i) such Person becomes a Restricted Subsidiary; or

           (ii) such Person, in one transaction or a series of related
       transactions, is merged, consolidated or amalgamated with or into, or
       transfers or conveys substantially all of its assets to, or is liquidated
       into, Alliance or a Restricted Subsidiary;

        (d) any Investment in securities or other assets not constituting cash
    or Cash Equivalents and received in connection with an Asset Sale made
    pursuant to the provisions of "--Repurchase at the Option of Holders--Asset
    Sales" or any other disposition of assets not constituting an Asset Sale;

        (e) any Investment existing on the date of the indenture;

        (f) advances to employees not in excess of $10 million outstanding at
    any one time, in the aggregate;

        (g) any Investment acquired by Alliance or any of its Restricted
    Subsidiaries:

           (i) in exchange for any other Investment or accounts receivable held
       by Alliance or any such Restricted Subsidiary in connection with or as a
       result of a bankruptcy, workout,

                                      109

       reorganization or recapitalization of the issuer of such other Investment
       or accounts receivable; or

           (ii) as a result of a foreclosure by Alliance or any of its
       Restricted Subsidiaries with respect to any secured Investment or other
       transfer of title with respect to any secured Investment in default; or

           (iii) in connection with a transaction or series of transactions in
       which the Person that owns the Investment becomes a Restricted Subsidiary
       or is merged, consolidated or amalgamated with or into, or transfers or
       conveys substantially all of its assets to, or is liquidated into
       Alliance or a Restricted Subsidiary; provided that such Investment was
       not made in contemplation of such transaction of series of transactions;

        (h) Hedging Obligations permitted under clause (j) of the "--Limitations
    on Incurrence of Indebtedness and Issuance of Disqualified Stock" covenant;

        (i) loans and advances to officers, directors and employees for
    business-related travel expenses, moving expenses and other similar
    expenses, in each case incurred in the ordinary course of business;

        (j) any Investment in a Similar Business having an aggregate fair market
    value, taken together with all other Investments made pursuant to this
    clause (j) that are at that time outstanding, not to exceed the greater of:

           (x) $50 million; or

           (y) 15% of Total Assets at the time of such Investment (with the fair
       market value of each Investment being measured at the time made and
       without giving effect to subsequent changes in value);

        (k) Investments the payment for which consists of Equity Interests of
    Alliance (exclusive of Disqualified Stock); PROVIDED, HOWEVER, that such
    Equity Interests will not increase the amount available for Restricted
    Payments under clause (3) of the "--Limitation on Restricted Payments"
    covenant;

        (l) additional Investments having an aggregate fair market value, taken
    together with all other Investments made pursuant to this clause (l) that
    are at that time outstanding, not to exceed the greater of:

           (x) $30 million; or

           (y) 10% of Total Assets at the time of such Investment (with the fair
       market value of each Investment being measured at the time made and
       without giving effect to subsequent changes in value);

        (m) any transaction to the extent it constitutes an Investment that is
    permitted by and made in accordance with the provisions of the second
    paragraph of the covenant described under "--Certain Covenants--Transactions
    with Affiliates" (except transactions described in clauses (2) and (6) of
    such paragraph); and

        (n) Investments relating to any special purpose Wholly Owned Subsidiary
    of Alliance organized in connection with a Receivables Facility that, in the
    good faith determination of the board of directors of Alliance, are
    necessary or advisable to effect such Receivables Facility.

    "PERSON" means any individual, corporation, partnership, joint venture,
association, joint stock company, trust, unincorporated organization, government
or any agency or political subdivision thereof or any other entity.

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    "PREFERRED STOCK" means any Equity Interest with preferential right of
payment of dividends or upon liquidation, dissolution, or winding up.

    "RECEIVABLES FACILITY" means one or more receivables financing facilities,
as amended from time to time, pursuant to which Alliance and/or any of its
Restricted Subsidiaries sells its accounts receivable to a Person that is not a
Restricted Subsidiary.

    "RECEIVABLES FEES" means distributions or payments made directly or by means
of discounts with respect to any participation interests issued or sold in
connection with, and other fees paid to a Person that is not a Restricted
Subsidiary in connection with, any Receivables Facility.

    "RELATED PARTIES" means any Person controlled by a Permitted Holder,
including any partnership of which a Permitted Holder or its Affiliates is the
general partner.

    "RESTRICTED INVESTMENT" means an Investment other than a Permitted
Investment.

    "RESTRICTED SUBSIDIARY" means, at any time, any direct or indirect
Subsidiary of Alliance that is not then an Unrestricted Subsidiary; PROVIDED,
HOWEVER, that upon the occurrence of an Unrestricted Subsidiary ceasing to be an
Unrestricted Subsidiary, such Subsidiary shall be included in the definition of
"Restricted Subsidiary."

    "S&P" means Standard and Poor's Ratings Group.

    "SENIOR INDEBTEDNESS" means:

        (1) the Obligations under the Credit Facility; and

        (2) any other Indebtedness permitted to be incurred by Alliance under
    the terms of the indenture, unless the instrument under which such
    Indebtedness is incurred expressly provides that it is on a parity with or
    subordinated in right of payment to the notes,

including, with respect to the preceding clauses (1) and (2), interest accruing
subsequent to the filing of, or which would have accrued but for the filing of,
a petition for bankruptcy, whether or not such interest is an allowable claim in
such bankruptcy proceeding. Notwithstanding anything to the contrary in the
preceding, Senior Indebtedness will not include:

        (1) any liability for federal, state, local or other taxes owed or owing
    by Alliance;

        (2) any obligation of Alliance to any of its Subsidiaries;

        (3) any accounts payable or trade liabilities arising in the ordinary
    course of business (including instruments evidencing such liabilities) other
    than obligations in respect of bankers' acceptances and letters of credit
    under the Credit Facility;

        (4) any Indebtedness that is incurred in violation of the indenture;

        (5) Indebtedness which, when incurred and without respect to any
    election under Section 1111(b) of Title 11, United States Code, is without
    recourse to Alliance;

        (6) any Indebtedness, guarantee or obligation of Alliance which is
    subordinate or junior to any other Indebtedness, guarantee or obligation of
    Alliance;

        (7) Indebtedness evidenced by the notes; and

        (8) Capital Stock of Alliance.

    "SIGNIFICANT SUBSIDIARY" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date
hereof.

    "SIMILAR BUSINESS" means a business the majority of whose revenues are
derived from the provision of diagnostic or therapeutic services or any business
or activity that is reasonably similar thereto or a

                                      111

reasonable extension, development or expansion thereof or ancillary thereto as
determined in good faith by the board of directors of Alliance.

    "SUBORDINATED INDEBTEDNESS" means

        (a) with respect to the notes, any Indebtedness of Alliance which is by
    its terms subordinated in right of payment to the notes; and

        (b) with respect to any Guarantee, any Indebtedness of the applicable
    Guarantor which is by its terms subordinated in right of payment to such
    Guarantee.

    "SUBSIDIARY" means, with respect to any Person:

        (a) any corporation, association, or other business entity (other than a
    partnership) of which more than 50% of the total voting power of shares of
    Capital Stock entitled (without regard to the occurrence of any contingency)
    to vote in the election of directors, managers or trustees thereof is at the
    time of determination owned or controlled, directly or indirectly, by such
    Person or one or more of the other Subsidiaries of that Person or a
    combination thereof; and

        (b) any partnership, joint venture, limited liability company or similar
    entity of which:

           (1) more than 50% of the capital accounts, distribution rights, total
       equity and voting interests or general or limited partnership interests,
       as applicable, are owned or controlled, directly or indirectly, by such
       Person or one or more of the other Subsidiaries of that Person or a
       combination thereof whether in the form of membership, general, special
       or limited partnership or otherwise; and

           (2) such Person or any Wholly Owned Restricted Subsidiary of such
       Person is a controlling general partner or otherwise controls such
       entity.

    "TOTAL ASSETS" means the total consolidated assets of Alliance and its
Restricted Subsidiaries, as shown on the most recent balance sheet (excluding
the footnotes thereto) of Alliance.

    "TREASURY RATE" means, as of any redemption date, the yield to maturity as
of such redemption date of United States Treasury securities with a constant
maturity (as compiled and published in the most recent Federal Reserve
Statistical Release H.15 (519) that has become publicly available at least two
business days prior to the redemption date (or, if such statistical release is
no longer published, any publicly available source of similar market data)) most
nearly equal to the period from the redemption date to April 15, 2006; PROVIDED,
HOWEVER, that if the period from the redemption date to April 15, 2006 is less
than one year, the weekly average yield on actually traded United States
Treasury securities adjusted to a constant maturity of one year shall be used.

    "UNRESTRICTED SUBSIDIARY" means

        (a) any Subsidiary of Alliance which at the time of determination is an
    Unrestricted Subsidiary (as designated by the board of directors of
    Alliance, as provided below);

        (b) any Subsidiary of an Unrestricted Subsidiary; and

        (c) the following entities:

           (i) Alliance Imaging Financial Services, Inc.;

           (ii) Alliance-Newport Harbor Radiology Group PET Services LLC;

           (iii) Valley Imaging Partnership-Alliance PET Services LLC; and

           (iv) Alliance Diagnostics Venture, LLC.

The board of directors of Alliance may designate any Subsidiary of Alliance
(including any existing Subsidiary and any newly acquired or newly formed
Subsidiary) to be an Unrestricted Subsidiary unless

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such Subsidiary or any of its Subsidiaries owns any Equity Interests of, or
owns, or holds any Lien on, any property of, Alliance or any Subsidiary of
Alliance (other than any Subsidiary of the Subsidiary to be so designated),
PROVIDED that:

           (1) any Unrestricted Subsidiary must be an entity of which shares of
       the capital stock or other equity interests (including partnership
       interests) entitled to cast at least a majority of the votes that may be
       cast by all shares or equity interests having ordinary voting power for
       the election of directors or other governing body are owned, directly or
       indirectly, by Alliance;

           (2) Alliance certifies that such designation complies with the
       covenants described under "--Certain Covenants--Limitation on Restricted
       Payments"; and

           (3) each of:

               (A) the Subsidiary to be so designated; and

               (B) its Subsidiaries;

       has not at the time of designation, and does not thereafter, create,
       incur, issue, assume, guarantee or otherwise become directly or
       indirectly liable with respect to any Indebtedness pursuant to which the
       lender has recourse to any of the assets of Alliance or any of its
       Restricted Subsidiaries.

The board of directors may designate any Unrestricted Subsidiary (including any
Unrestricted Subsidiary set forth in clause (c) of this definition) to be a
Restricted Subsidiary; provided that, immediately after giving effect to such
designation:

           (x) Alliance could incur at least $1.00 of additional Indebtedness
       pursuant to the Fixed Charge Coverage Ratio test described under
       "--Certain Covenants--Limitations on Incurrence of Indebtedness and
       Issuance of Disqualified Stock"; or

           (y) the Fixed Charge Coverage Ratio for Alliance and its Restricted
       Subsidiaries would be greater than such ratio for Alliance and its
       Restricted Subsidiaries immediately prior to such designation,

    in each case on a pro forma basis taking into account such designation.

Any such designation by the board of directors shall be notified by Alliance to
the trustee by promptly filing with the trustee a copy of the board resolution
giving effect to such designation and an officers' certificate certifying that
such designation complied with the foregoing provisions.

    "VOTING STOCK" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the board of
directors of such Person.

    "WEIGHTED AVERAGE LIFE TO MATURITY" means, when applied to any Indebtedness
or Disqualified Stock, as the case may be, at any date, the quotient obtained by
dividing

        (a) the sum of the products of the number of years from the date of
    determination to the date of each successive scheduled principal payment of
    such Indebtedness or redemption or similar payment with respect to such
    Disqualified Stock multiplied by the amount of such payment, by

        (b) the sum of all such payments.

    "WHOLLY OWNED RESTRICTED SUBSIDIARY" is any Wholly Owned Subsidiary that is
a Restricted Subsidiary.

    "WHOLLY OWNED SUBSIDIARY" of any Person means a Subsidiary of such Person
100% of the outstanding Capital Stock or other ownership interests of which
(other than directors' qualifying shares) shall at the time be owned by such
Person or by one or more Wholly Owned Subsidiaries of such Person and one or
more Wholly Owned Subsidiaries of such Person.

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            MATERIAL UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

    The following is a summary of the material United States federal income tax
considerations relevant to the exchange of old notes for exchange notes and to
the ownership and disposition of the exchange notes, but does not purport to be
a complete analysis of all the potential tax considerations relating thereto.
This summary is based on laws, regulations, rulings and decisions now in effect,
all of which are subject to change or differing interpretation possibly with
retroactive effect. We have not sought any ruling from the Internal Revenue
Service (the "IRS") or an opinion of counsel with respect to the statements made
and the conclusions reached in the following summary, and there can be no
assurance that the IRS will agree with such statements and conclusions.

    This discussion applies to you only if you hold the old notes and will hold
the exchange notes as capital assets. This discussion also does not address the
tax considerations arising under the laws of any foreign, state or local
jurisdiction. In addition, this discussion does not address tax considerations
applicable to your particular circumstances or if you are a taxpayer subject to
special tax rules, including, without limitation:

    - a bank;

    - a holder subject to the alternative minimum tax;

    - a tax-exempt organization;

    - an insurance company;

    - a foreign person or entity (except to the extent specifically set forth
      below);

    - a dealer in securities or currencies;

    - a person that holds old notes or will hold exchange notes as a position in
      a hedging transaction, "straddle" or "conversion transaction" for tax
      purposes; or

    - a person deemed to sell notes under the constructive sale provisions of
      the Internal Revenue Code.

    YOU ARE URGED TO CONSULT YOUR TAX ADVISOR WITH RESPECT TO THE APPLICATION OF
THE UNITED STATES FEDERAL INCOME TAX LAWS TO YOUR PARTICULAR SITUATION AS WELL
AS ANY TAX CONSEQUENCES ARISING UNDER THE FEDERAL ESTATE OR GIFT TAX RULES OR
UNDER THE LAWS OF ANY STATE, LOCAL, FOREIGN OR OTHER TAXING JURISDICTION OR
UNDER ANY APPLICABLE TAX TREATY.

U.S. HOLDERS

    For purposes of this summary, a "U.S. holder" means:

    1.  an individual citizen or resident of the United States;

    2.  a corporation (or an entity treated as a corporation) or partnership
       created or organized in the United States or under the laws of the United
       States, any state thereof, or the District of Columbia;

    3.  an estate, the income of which is subject to United States federal
       income taxation regardless its source; or

    4.  a trust subject to the primary supervision of a United States court and
       the control of one or more United States persons, or a trust in existence
       on August 20, 1996 that has elected to continue to be treated as a United
       States person.

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In addition, if a holder is an entity treated as a partnership for United States
federal income tax purposes, the tax treatment of each partner of such
partnership will generally depend upon the status of the partner and upon the
activities of the partnership. If you are a partner in a partnership which holds
notes or common stock, you should consult your tax advisor.

EXCHANGE OF OLD NOTES FOR EXCHANGE NOTES.

    The exchange of the old notes for the exchange notes in the exchange offer
will not be treated as an "exchange" for federal income tax purposes, because
the old notes will not be considered to differ materially in kind or extent from
the exchange notes. A U.S. holder will have an initial tax basis in the exchange
notes equal to the basis of the old notes exchanged therefor, and the U.S.
holder's holding period for the exchange notes will include the period during
which the U.S. holder held the old notes.

TAXATION OF INTEREST.

    You must include interest paid on the exchange notes as ordinary income at
the time it is received or accrued, in accordance with your regular method of
accounting for United States federal income tax purposes.

TAXATION OF MARKET DISCOUNT.

    The market discount rules discussed below apply to any exchange note
purchased after original issue at a price less than its stated redemption price
at maturity.

    If you purchase an exchange note at a market discount, you generally will be
required to treat any principal payments on, or any gain on the disposition on
maturity of, such note as ordinary income to the extent of the accrued market
discount (not previously included in income) at the time of such payment or
disposition. In general, subject to a DE MINIMIS exception, market discount is
the amount by which the note's stated redemption price at maturity exceeds your
basis in the note immediately after the note is acquired. A note is not treated
as purchased at a market discount, however, if the market discount is less than
0.25 percent of the stated redemption price at maturity of the note multiplied
by the number of complete years to maturity from the date when you acquired the
note. Market discount on a note will accrue on a straight-line basis, unless you
elect to accrue such discount on a constant yield to maturity basis. This
election is irrevocable and applies only to the note for which it is made. You
may also elect to include market discount in income currently as it accrues.
This election, once made, applies to all market discount obligations acquired on
or after the first day of the first taxable year to which the election applies
and may not be revoked without the consent of the IRS. If you acquire a note at
a market discount and dispose of such note in any non-taxable transaction (other
than a nonrecognition transaction defined in section 1276(c) of the Internal
Revenue Code), accrued market discount will be includable as ordinary income to
you as if you had sold the note at its fair market value. You may be required to
defer until the maturity of the note or, in certain circumstances, its earlier
disposition the deduction of all or a portion of the interest expense
attributable to debt incurred or continued to purchase or carry a note with
market discount, unless the election to include the market discount in income on
a current basis is made.

TAXATION OF AMORTIZABLE BOND PREMIUM.

    If you purchase an exchange note for an amount in excess of its stated
redemption price at maturity, you will generally be considered to have purchased
the note with "amortizable bond premium." The amount of amortizable bond premium
is computed based on the redemption price on an earlier call date if such
computation results in a smaller amortizable bond premium attributable to the
period of such earlier call date. You generally may elect to amortize such
premium using the constant yield to maturity method. The amount amortized in any
year will generally be treated as a

                                      115

reduction of your interest income on the note. If the amortizable bond premium
allocable to a year exceeds the amount of interest allocable to that year, the
excess would be allowed as a deduction for that year but only to the extent of
your prior interest inclusions on the note. If you do not make such an election,
the premium on a note will decrease the gain or increase the loss otherwise
recognized on the sale, redemption, retirement or other disposition of the note.
The election to amortize the premium on a constant yield to maturity method,
once made, generally applies to all bonds held or subsequently acquired by you
on or after the first day of the first taxable year to which the election
applies. You may not revoke this election without the consent of the IRS.

SALE, EXCHANGE OR REDEMPTION OF THE NOTES.

    Upon the sale, exchange or redemption of an exchange note, you generally
will recognize capital gain or loss equal to the difference between (i) the
amount of cash proceeds and the fair market value of any property received on
the sale, exchange or redemption (except to the extent such amount is
attributable to accrued interest income not previously included in income, which
will be taxable as ordinary income, or is attributable to accrued interest that
was previously included in income, which amount may be received without
generating further income) and (ii) your adjusted tax basis in the note. Your
adjusted tax basis in a note generally will equal the cost of the note,
increased by market discount previously included in income, if any, and reduced
by any bond premium previously amortized. Subject to the market discount rules
discussed above, such capital gain or loss will be long-term capital gain or
loss if your holding period in the exchange note is more than one year at the
time of sale, exchange or redemption. Long-term capital gains recognized by
certain noncorporate U.S. holders, including individuals, will generally be
subject to a maximum tax rate of 20%. The deductibility of capital losses is
subject to limitations.

BACKUP WITHHOLDING AND INFORMATION REPORTING.

    Backup withholding of United States federal income tax at a rate of up to
31% may apply to payments pursuant to the terms of an exchange note if you are a
U.S. holder and not an "exempt recipient" and if you fail to provide certain
identifying information (such as your TIN) in the manner required. Generally,
individuals are not exempt recipients. Corporations are exempt recipients,
whereas other entities may be exempt recipients. Payments made in respect of an
exchange note must be reported to the IRS, unless you are an exempt recipient or
otherwise establish an exemption. Any amount withheld from a payment to you
under the backup withholding rules is allowable as a refund or credit against
your United States federal income tax, provided that the required information is
furnished to the IRS in a timely manner.

NON-U.S. HOLDERS

    For purposes of this discussion, a "non-U.S. holder" means a holder that is
not a U.S. holder. In general, subject to the discussion below concerning backup
withholding:

EXCHANGE OF OLD NOTES FOR EXCHANGE NOTES.

    The material federal income tax consequences to a non-U.S. holder of an
exchange of old notes for exchange notes will be the same as those described for
U.S. holders under "--U.S. Holders--Exchange of Old Notes for Exchange Notes."

                                      116

TAXATION OF INTEREST.

    Payments of principal or interest on the exchange notes by us or any paying
agent to a beneficial owner of a note that is a non-U.S. holder will not be
subject to United States withholding tax, provided that, in the case of
interest:

    1.  you do not own, actually or constructively, 10% or more of the total
       combined voting power of all classes of our stock entitled to vote;

    2.  you are not a "controlled foreign corporation" with respect to which we
       are a "related person;"

    3.  you are not a bank receiving interest pursuant to a loan agreement
       entered into in the ordinary course of your trade or business; and

    4.  certain certification requirements are satisfied.

    To satisfy the certification requirements referred to in (4) above, either
(i) the beneficial owner of a note must certify, under penalties of perjury, to
us or our paying agent, as the case may be, that such owner is a non-U.S. holder
and must-provide such owner's name and address, and United States taxpayer
identification number, if any, or (ii) a securities clearing organization, bank
or other financial institution that holds customer securities in the ordinary
course of its trade or business (a "Financial Institution") and holds the note
on behalf of the beneficial owner thereof must certify, under penalties of
perjury, to us or our paying agent, as the case may be, that such certificate
has been received from the beneficial owner and must furnish the payor with a
copy thereof. Such requirement will be fulfilled if the beneficial owner of a
note certifies on IRS Form W-8BEN or successor form, under penalties of perjury,
that it is a non-U.S. holder and provides its name and address or any Financial
Institution holding the note on behalf of the beneficial owner files a statement
with the withholding agent to the effect that it has received such a statement
from the beneficial owner (and furnishes the withholding agent with a copy
thereof). The applicable regulations generally also require, in the case of a
note held by a foreign partnership, that:

    1.  the certification described above be provided by the partners; and

    2.  the partnership provide certain information, including, under certain
       circumstances, a United States taxpayer identification number.

    Further, a look-through rule will apply in the case of tiered partnerships.
Prospective investors should consult their tax advisors regarding the
certification requirements for non-U.S. holders.

    Interest on exchange notes not excluded from United States withholding tax
as described above generally will be subject to United States withholding tax at
a 30% rate, except where an applicable United States income tax treaty provides
for the reduction or elimination of such withholding tax (and you provide the
appropriate certification) or if interest on the notes is effectively connected
with your conduct of a trade or business in the United States, which is
described more fully below.

SALE, EXCHANGE OR REDEMPTION OF EXCHANGE NOTES.

    You will not be required to pay United States federal income tax on gains
realized on the sale, exchange or redemption of an exchange note (except with
respect to accrued and unpaid interest, which would be taxable as described
above) unless:

    1.  you are an individual who is present in the United States for 183 days
       or more in the taxable year of sale, exchange or other disposition, and
       certain conditions are met;

                                      117

    2.  such gain is effectively connected with your conduct of a trade or
       business in the United States and, if certain United States income tax
       treaties apply, is attributable to a United States permanent
       establishment maintained by you; or

    3.  you are subject to Code provisions applicable to certain United States
       expatriates.

INCOME OR GAINS EFFECTIVELY CONNECTED WITH A UNITED STATES TRADE OR BUSINESS.

    If you are engaged in a trade or business in the United States and if
interest on the exchange notes or gain realized on the sale, exchange or other
disposition of an exchange note is effectively connected with the conduct of
such trade or business (and, if certain tax treaties apply, is attributable to a
United States permanent establishment maintained by you in the United States),
you, although exempt from United States withholding tax (provided that the
certification requirements discussed in the next sentence are met), will
generally be required to pay United States federal income tax on such interest
or gain on a net income basis in the same manner as if you were a U.S. holder.
In lieu of the certificate described above, you would be required, under
currently effective Treasury Regulations, to provide us with a properly executed
IRS Form W-8ECI or successor form in order to claim an exemption from United
States withholding tax. In addition, if you are a foreign corporation, you may
be subject to a branch profits tax equal to 30% (or such lower rate provided by
an applicable United States income tax treaty) of a portion of your effectively
connected earnings and profits for the taxable year.

UNITED STATES FEDERAL ESTATE TAX.

    An exchange note held by an individual who at the time of death is not a
citizen or resident of the United States (as specially defined for United States
federal estate tax purposes) will not be subject to United States federal estate
tax if the individual did not actually or constructively own 10% or more of the
total combined voting power of all classes of our stock and, at the time of the
individual's death, payments with respect to such note would not have been
effectively connected with the conduct by such individual of a trade or business
in the United States.

BACKUP WITHHOLDING AND INFORMATION REPORTING.

    You may have to comply with specific certification procedures to establish
that you are not a United States person in order to avoid backup withholding tax
requirements with respect to payments of principal and interest on the notes. In
addition, we may be required to report annually to the IRS and to you the amount
of, and the tax withheld respect to, any interest paid to you, regardless of
whether any tax was actually withheld. Copies of these information returns may
also be made available under the provisions of a specific treaty or agreement to
the tax authorities of the country in which the non-U.S. holder resides.

    Any amounts withheld under the backup withholding rules from a payment to
you will be allowed as a refund or credit against your United States federal
income tax provided that the required information is furnished to the IRS in a
timely manner.

    THE PRECEDING DISCUSSION OF CERTAIN UNITED STATES FEDERAL INCOME TAX
CONSIDERATIONS IS FOR GENERAL INFORMATION ONLY AND IS NOT TAX ADVICE.
ACCORDINGLY, YOU ARE URGED TO CONSULT YOUR TAX ADVISORS AS TO THE PARTICULAR TAX
CONSEQUENCES TO YOU OF THE OWNERSHIP AND DISPOSITION OF THE EXCHANGE NOTES,
INCLUDING THE EFFECT AND APPLICABILITY OF STATE, LOCAL, FOREIGN OR OTHER TAX
LAWS, AS WELL AS THE CONSEQUENCES OF ANY PROPOSED CHANGE IN APPLICABLE LAWS.

                                      118

                              PLAN OF DISTRIBUTION

    Each broker-dealer that receives exchange notes for its own account pursuant
to the exchange offer must acknowledge that it will deliver a prospectus in
connection with any resale of such exchange notes. This prospectus, as it may be
amended or supplemented, may be used by a broker-dealer in connection with
resales of exchange notes received in exchange for outstanding notes only where
such outstanding notes were acquired as a result of market-making activities or
other trading activities. We have agreed that we will make this prospectus, as
amended or supplemented, available to any broker-dealer for use in connection
with any such resale for a period of 180 days from the date on which the
exchange offer is consummated, or such shorter period as will terminate when all
outstanding notes acquired by broker-dealers for their own accounts as a result
of market-making activities or other trading activities have been exchanged for
exchange notes and such exchange notes have been resold by such broker-dealers.

    We will not receive any proceeds from any sale of exchange notes by
broker-dealers. Exchange notes received by broker-dealers for their own account
pursuant to the exchange offer may be sold from time to time in one or more
transactions:

    - in the over-the-counter market;

    - in negotiated transactions

    - through the writing of options on the exchange notes; or

    - through a combination of the above methods of resale,

at market prices prevailing at the time of resale, at prices related to such
prevailing market prices or negotiated prices. Any such resale may be made
directly to purchasers or to or through brokers or dealers who may receive
compensation in the form of commissions or concessions from any such
broker-dealer or the purchasers of any exchange notes. Any broker-dealer that
resells exchange notes that were received by it for its own account pursuant to
the exchange offer and any broker or dealer that participates in a distribution
of such exchange notes may be deemed to be an "underwriter" within the meaning
of the Securities Act and any profit on any such resale of exchange notes and
any commissions or concessions received by any such persons may be deemed to be
underwriting compensation under the Securities Act. The letter of transmittal
states that by acknowledging that it will deliver and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

    For a period of 180 days from the date on which the exchange offer is
consummated, or such shorter period as will terminate when all outstanding notes
acquired by broker-dealers for their own accounts as a result of market-making
activities or other trading activities have been exchanged for exchange notes
and such exchange notes have been resold by such broker-dealers, we will
promptly send additional copies of this prospectus and any amendment or
supplement to this prospectus to any broker-dealer that requests such documents
in the letter of transmittal. We have agreed to pay all expenses incident to the
exchange offer other than commissions or concessions of any brokers or dealers
and the fees of any counsel or other advisors or experts retained by the holders
of outstanding notes, except as expressly set forth in the registration rights
agreement, and will indemnify the holders of outstanding notes, including any
broker-dealers, against specified liabilities, including liabilities under the
Securities Act.

    By its acceptance of the exchange offer, any broker-dealer that receives
exchange notes pursuant to the exchange offer agrees to notify us before using
the prospectus in connection with the sale or transfer of exchange notes. The
broker-dealer further acknowledges and agrees that, upon receipt of notice from
us of the happening of any event which:

    - makes any statement in the prospectus untrue in any material respect;

                                      119

    - requires the making of any changes in the prospectus to make the
      statements in the prospectus not misleading; or

    - may impose upon us disclosure obligations that my have a material adverse
      effect on us,

which notice we agree to deliver promptly to the broker-dealer, the
broker-dealer will suspend use of the prospectus until we have notified the
broker-dealer that delivery of the prospectus may resume and have furnished
copies of any amendment or supplement to the prospectus to the broker-dealer.

                                 LEGAL MATTERS

    Latham & Watkins, Los Angeles, California, will pass upon various legal
matters for us in connection with the exchange notes offered hereby. Certain
partners of Latham & Watkins, members of their families and related persons
indirectly own less than 1% of our common stock.

                                    EXPERTS

    The consolidated financial statements as of December 31, 2000 and 1999, and
for the years then ended, included in this prospectus and the related financial
statement schedule included elsewhere in the registration statement have been
audited by Deloitte & Touche LLP, independent auditors, as stated in their
reports appearing herein and elsewhere in the registration statement, and have
been so included in reliance upon the reports of such firm given upon their
authority as experts in accounting and auditing.

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule for the year ended December 31, 1998, as set
forth in their reports. We have included our financial statements and schedule
for this period in the prospectus and elsewhere in the registration statement in
reliance on Ernst & Young LLP's reports, given on their authority as experts in
accounting and auditing.

                             CHANGE OF ACCOUNTANTS

    In November 1999, in connection with the KKR acquisition, our new board of
directors elected to change our independent auditors from Ernst & Young LLP to
Deloitte & Touche LLP. In connection with Ernst & Young LLP's audit of the
financial statements for the year ended December 31, 1998 and for the subsequent
unaudited six-month period ended June 30, 1999, there were no disagreements with
Ernst & Young LLP on any matters of accounting principles or practices,
financial statement disclosures or auditing scope or procedures, nor any
reportable events. Ernst & Young LLP's reports on our financial statements for
the year ended December 31, 1998 contained no adverse opinions or disclaimers of
opinion and were not modified or qualified as to uncertainty, audit scope or
accounting principles. We have provided Ernst & Young LLP with a copy of the
disclosure contained in this section of the prospectus. Prior to retaining
Deloitte & Touche LLP, we did not consult with Deloitte & Touche LLP regarding
the application of accounting principles to a specified transaction or the type
of audit opinion that might be rendered on our financial statements.

                                      120

                             ALLIANCE IMAGING, INC.

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS



                                                                PAGE
                                                              --------
                                                           
Independent Auditors' Report of Deloitte & Touche LLP.......  F-2
Independent Auditors' Report of Ernst & Young LLP...........  F-3
Consolidated Financial Statements
  Consolidated Balance Sheets...............................  F-4
  Consolidated Statements of Operations.....................  F-5
  Consolidated Statements of Cash Flows.....................  F-6
  Consolidated Statements of Stockholders' Deficit..........  F-9
  Notes to Consolidated Financial Statements................  F-10


                                      F-1

                          INDEPENDENT AUDITORS' REPORT

The Board of Directors and Stockholders of
Alliance Imaging, Inc.

    We have audited the accompanying consolidated balance sheets of Alliance
Imaging, Inc. and subsidiaries (the Company), as of December 31, 2000 and 1999,
and the related consolidated statements of operations, cash flows and
stockholders' deficit for the years then ended. These financial statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audits.

    We conducted our audits in accordance with auditing standards generally
accepted in the United States of America. Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

    In our opinion, such consolidated financial statements present fairly, in
all material respects, the financial position of Alliance Imaging, Inc. and
subsidiaries as of December 31, 2000 and 1999, and the results of their
operations and their cash flows for the years then ended in conformity with
accounting principles generally accepted in the United States of America.

                                          Deloitte & Touche LLP

Costa Mesa, California
February 22, 2001

                                      F-2

                          INDEPENDENT AUDITORS' REPORT

The Board of Directors and Stockholders
Alliance Imaging, Inc.

We have audited the consolidated balance sheet (not separately presented herein)
of Alliance Imaging, Inc. as of December 31, 1998, and the related accompanying
restated consolidated statement of operations, stockholders' deficit and cash
flows for the year ended December 31, 1998. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audit.

We conducted our audit in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audit provides a reasonable basis for our
opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the consolidated financial position of
Alliance Imaging, Inc. at December 31, 1998, and the consolidated results of its
operations and its cash flows for the year ended December 31, 1998, in
conformity with accounting principles generally accepted in the United States.

                                            Ernst & Young LLP

Orange County, California
March 5, 1999, except for Note 1 -- Common Control Merger,
as to which the date is May 13, 1999

                                      F-3

                             ALLIANCE IMAGING, INC.

                          CONSOLIDATED BALANCE SHEETS

                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)



                                                                 DECEMBER 31,         MARCH 31,
                                                             ---------------------   -----------
                                                               1999        2000         2001
                                                             ---------   ---------   -----------
                                                                                     (UNAUDITED)
                                                                            
ASSETS
Current assets:
  Cash and cash equivalents................................  $   4,804   $  12,971    $   9,634
  Accounts receivable, net of allowance for doubtful
    accounts of $11,688 in 1999, $15,570 in 2000, and
    $16,055 in 2001........................................     51,877      49,973       52,570
  Deferred income taxes....................................      8,369       3,085        3,085
  Prepaid expenses.........................................      2,574       1,874        1,850
  Other receivables........................................      4,001       4,189        5,925
                                                             ---------   ---------    ---------
Total current assets.......................................     71,625      72,092       73,064
Equipment, at cost.........................................    408,083     506,735      535,777
Less accumulated depreciation..............................   (125,800)   (176,939)    (192,114)
                                                             ---------   ---------    ---------
                                                               282,283     329,796      343,663
Goodwill, net of accumulated amortization of $27,939 in
  1999, $35,600 in 2000, and $37,882 in 2001...............    158,534     151,981      149,699
Other intangibles, net of accumulated amortization of
  $9,017 in 1999, $14,570 in 2000, and $15,895 in 2001.....     74,724      69,450       68,132
Deferred financing costs, net of accumulated amortization
  of $825 in 1999, $3,095 in 2000, and $3,643 in 2001......     16,324      14,104       13,606
Deposits and other assets..................................     22,020       8,737        6,621
                                                             ---------   ---------    ---------
Total assets...............................................  $ 625,510   $ 646,160    $ 654,785
                                                             =========   =========    =========
LIABILITIES AND STOCKHOLDERS' DEFICIT
Current liabilities:
  Accounts payable.........................................  $   4,144   $  11,980    $  13,628
  Accrued compensation and related expenses................      7,265       8,776        8,251
  Accrued interest payable.................................      5,892      14,412        8,198
  Other accrued liabilities................................     22,564      23,188       19,707
  Current portion of long-term debt........................     12,974      15,863       17,015
                                                             ---------   ---------    ---------
Total current liabilities..................................     52,839      74,219       66,799
Long-term debt, net of current portion.....................    478,875     483,126      497,109
Senior subordinated credit facility due to affiliate.......    260,000     260,000      260,000
Minority interests.........................................        459         702        1,398
Deferred income taxes......................................     35,236      31,922       31,922
                                                             ---------   ---------    ---------
Total liabilities..........................................    827,409     849,969      857,228
Commitments and contingencies (NOTE 8)
Stockholders' deficit:
  Common stock, $.01 par value; 10,000,000 shares
    authorized; shares issued and outstanding--3,798,858 in
    1999, 3,806,836 in 2000 and 2001.......................         38          38           38
  Additional paid-in deficit...............................   (137,825)   (137,232)    (137,103)
  Note receivable from officer.............................         --        (300)        (300)
  Accumulated deficit......................................    (64,112)    (66,315)     (65,078)
                                                             ---------   ---------    ---------
Total stockholders' deficit................................   (201,899)   (203,809)    (202,443)
                                                             ---------   ---------    ---------
Total liabilities and stockholders' deficit................  $ 625,510   $ 646,160    $ 654,785
                                                             =========   =========    =========


                            SEE ACCOMPANYING NOTES.

                                      F-4

                             ALLIANCE IMAGING, INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS

                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)



                                                                               THREE MONTHS ENDED
                                                 YEARS ENDED DECEMBER 31,           MARCH 31,
                                              ------------------------------   -------------------
                                                1998       1999       2000       2000       2001
                                              --------   --------   --------   --------   --------
                                                                                   (UNAUDITED)
                                                                           
Revenues....................................  $243,297   $318,106   $345,287   $84,322    $91,257
Costs and expenses:
  Operating expenses, excluding
    depreciation............................   111,875    143,238    151,722    36,647     39,853
  Depreciation expense......................    33,493     47,055     54,924    12,721     15,406
  Selling, general and administrative
    expenses................................    24,446     31,097     38,338     9,240     11,068
  Amortization expense, primarily
    goodwill................................    11,289     14,565     14,390     3,598      3,607
  Termination and related costs.............        --         --      4,573
  Recapitalization, merger integration, and
    regulatory costs........................     2,818     52,581      4,523       336         --
  Interest expense, net of interest income
    of $513 in 1998, $709 in 1999, $770 in
    2000 and $139 and $160 for the three
    months ended March 31, 2000 and 2001,
    respectively............................    41,772     51,958     77,051    18,933     18,849
                                              --------   --------   --------   -------    -------
Total costs and expenses....................   225,693    340,494    345,521    81,475     88,783
                                              --------   --------   --------   -------    -------
Income (loss) before income taxes and
  extraordinary loss........................    17,604    (22,388)      (234)    2,847      2,474
Provision for income taxes..................     8,736      3,297      1,969     1,423      1,237
                                              --------   --------   --------   -------    -------
Income (loss) before extraordinary loss.....     8,868    (25,685)    (2,203)    1,424      1,237
Extraordinary loss, net of taxes of $1,452
  in 1998 and $12,020 in 1999...............    (2,271)   (17,766)        --        --         --
                                              --------   --------   --------   -------    -------
Net income (loss)...........................     6,597    (43,451)    (2,203)    1,424      1,237
Less: Preferred stock dividends and
  financing fee accretion...................    (2,186)    (2,081)        --        --         --
Less: Excess of consideration paid over
  carrying amount of preferred stock
  repurchased...............................        --     (2,796)        --        --         --
                                              --------   --------   --------   -------    -------
Income (loss) applicable to common stock....  $  4,411   $(48,328)  $ (2,203)  $ 1,424    $ 1,237
                                              ========   ========   ========   =======    =======

Earnings (loss) per common share:
  Income (loss) before extraordinary loss...  $   1.17   $  (5.64)  $  (0.58)  $  0.37    $  0.32
  Extraordinary loss, net of taxes..........     (0.40)     (3.28)        --        --         --
                                              --------   --------   --------   -------    -------
  Net income (loss) per common share........  $   0.77   $  (8.92)  $  (0.58)  $  0.37    $  0.32
                                              ========   ========   ========   =======    =======
Earnings (loss) per common share--assuming
  dilution:
  Income (loss) before extraordinary loss...  $   1.13   $  (5.64)  $  (0.58)  $  0.36    $  0.31
  Extraordinary loss, net of taxes..........     (0.38)     (3.28)        --        --         --
                                              --------   --------   --------   -------    -------
  Net income (loss) per common share--
    assuming dilution.......................  $   0.75   $  (8.92)  $  (0.58)  $  0.36    $  0.31
                                              ========   ========   ========   =======    =======
Weighted average number of shares of common
  stock and common stock equivalents:
  Basic.....................................     5,711      5,421      3,800     3,799      3,807
  Diluted...................................     5,921      5,421      3,800     3,948      4,040


                            SEE ACCOMPANYING NOTES.

                                      F-5

                             ALLIANCE IMAGING, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

                             (DOLLARS IN THOUSANDS)



                                                                              THREE MONTHS ENDED
                                             YEARS ENDED DECEMBER 31,             MARCH 31,
                                         ---------------------------------   --------------------
                                           1998        1999        2000        2000        2001
                                         ---------   ---------   ---------   ---------   --------
                                                                                 (UNAUDITED)
                                                                          
OPERATING ACTIVITIES:
Net income (loss)......................  $   6,597   $ (43,451)  $  (2,203)  $  1,424    $  1,237
Adjustments to reconcile net income
  (loss) to net cash provided by
  operating activities:
  Extraordinary loss, net of taxes.....      2,271      17,766          --         --          --
  Provision for doubtful accounts......      4,651       4,580       5,450      1,572       1,496
  Non-cash compensation................        100          --         333         --         129
  Depreciation and amortization........     44,782      61,620      69,314     16,319      19,013
  Amortization of deferred financing
    costs..............................      2,505       2,720       2,270        744         548
  Distributions in excess of equity in
    undistributed income of investee...       (652)       (600)       (538)        50         165
  Increase in deferred income taxes....      8,517       2,948       1,970
  Gain on sale of equipment............       (267)        (88)       (254)       (29)       (102)
Changes in operating assets and
  liabilities:
  Accounts receivable..................    (14,159)    (13,350)     (3,546)    (4,560)     (3,635)
  Prepaid expenses.....................        730         767         700        480          24
  Other receivables....................        926          60        (188)      (157)     (1,846)
  Other assets.........................     (2,300)        544         (92)      (879)       (397)
  Accounts payable, accrued
    compensation and other accrued
    liabilities........................     (2,816)      4,935      18,585      6,205      (8,655)
  Minority interests and other
    liabilities........................     (4,030)       (254)        243         94         307
                                         ---------   ---------   ---------   --------    --------
Net cash provided by operating
  activities...........................     46,855      38,197      92,044     21,263       8,284

INVESTING ACTIVITIES:
Equipment purchases....................    (72,321)    (95,914)   (101,554)   (34,010)    (21,152)
Decrease (increase) in deposits on
  equipment............................     (7,482)     (8,058)     13,913      8,026       2,212
Purchase of common stock of Southeast
  Arizona, Inc.........................         --          --      (4,063)        --          --
Purchase of all equity interests in
  Acclaim Medical LLC, net of cash
  acquired.............................         --        (493)         --         --          --
Purchase of common stock of Mid
  American Imaging Inc., Dimensions
  Medical Group, Inc. and RIA
  Management Services, Inc., net of
  cash acquired........................    (12,495)         --          --         --          --
Purchase of common stock of Mobile
  Technology Inc., net of cash
  acquired.............................    (94,147)         --          --         --          --
Purchase of common stock of Medical
  Diagnostics, Inc., net of cash
  acquired.............................    (31,158)         --          --         --          --
Purchase of all equity interests in two
  operating subsidiaries of American
  Shared Hospital Services.............    (29,845)       (400)         --         --          --
Proceeds from sale of equipment........      2,358         793         709         87         104
Other..................................        (14)         --          --         --          --
                                         ---------   ---------   ---------   --------    --------
Net cash used in investing
  activities...........................   (245,104)   (104,072)    (90,995)   (25,897)    (18,836)


                                      F-6

                             ALLIANCE IMAGING, INC.

               CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)

                             (DOLLARS IN THOUSANDS)



                                                                              THREE MONTHS ENDED
                                             YEARS ENDED DECEMBER 31,             MARCH 31,
                                         ---------------------------------   --------------------
                                           1998        1999        2000        2000        2001
                                         ---------   ---------   ---------   ---------   --------
                                                                                 (UNAUDITED)
                                                                          
FINANCING ACTIVITIES:
Principal payments on long-term debt...  $ (15,757)  $ (20,686)  $ (13,298)  $ (3,677)   $ (2,735)
Proceeds from long-term debt...........         --          --       2,438         --          --
Principal payments on term loan
  facility.............................       (500)   (320,655)         --         --          --
Proceeds from term loan facility.......    175,000     536,000          --         --          --
Principal payments on revolving loan
  facility.............................    (59,976)    (68,835)    (15,000)        --          --
Proceeds from revolving loan
  facility.............................     91,940      32,602      33,000      8,000      10,000
Principal payments on senior
  subordinated notes...................         --    (185,000)         --         --          --
Consent payments and fees to retire
  senior subordinated notes............         --     (16,131)         --         --          --
Proceeds from senior subordinated
  credit facility......................         --     260,000          --         --          --
Refinance of short and long-term
  debt.................................       (843)         --          --         --          --
Repurchase of Series F preferred
  stock................................         --     (21,550)         --         --          --
Repurchase of common stock and common
  stock warrants.......................         --    (302,553)         --         --          --
Issuance of common stock...............         --     191,802          --         --          --
Payments of debt issuance costs........       (853)    (17,905)        (50)        --         (50)
Proceeds from exercise of employee
  stock options........................         66         507          28         --          --
                                         ---------   ---------   ---------   --------    --------
Net cash provided by financing
  activities...........................    189,077      67,596       7,118      4,323       7,215
                                         ---------   ---------   ---------   --------    --------

Net increase (decrease) in cash and
  cash equivalents.....................     (9,172)      1,721       8,167       (311)     (3,337)
Cash and cash equivalents, beginning of
  year.................................     12,255       3,083       4,804      4,804      12,971
                                         ---------   ---------   ---------   --------    --------
Cash and cash equivalents, end of
  year.................................  $   3,083   $   4,804   $  12,971   $  4,493    $  9,634
                                         =========   =========   =========   ========    ========
SUPPLEMENTAL DISCLOSURE OF CASH FLOW
  INFORMATION:
Interest paid..........................  $  38,742   $  46,653   $  67,031   $ 11,060    $ 24,675
Income taxes paid......................        748         101         229         47        (115)

SUPPLEMENTAL DISCLOSURE OF NONCASH
  INVESTING AND FINANCING ACTIVITIES:
Net book value of assets exchanged.....  $     454   $     115   $   3,319   $     --    $    105
Capital lease obligations assumed for
  the purchase of equipment............         --          --          --         --       5,165
Preferred stock dividend accrued and
  financing fee accretion..............      2,186       2,081          --         --          --
Issuance of common stock to an officer
  in exchange for a promissory note....         --          --         300         --          --


                                      F-7

                             ALLIANCE IMAGING, INC.

               CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)

                             (DOLLARS IN THOUSANDS)

    In 1998, Canton Holding Corp., a wholly owned subsidiary of SMT, purchased
all of the common stock of Mid American Imaging, Inc. and Dimensions Medical
Group, Inc. and related assets for cash consideration of approximately $10,418.
In connection with the acquisition, liabilities were assumed as follows:


                                                         
Fair value of assets acquired.............................  $ 16,282
Cash paid for equity interests............................   (10,418)
                                                            --------
Liabilities assumed.......................................  $  5,864
                                                            ========


    In 1998, the Company purchased all of the equity interests of MTI for cash
consideration of approximately $103,893. In connection with the acquisition,
liabilities were assumed as follows:


                                                        
Fair value of assets acquired............................  $ 125,720
Cash paid for equity interests...........................   (103,893)
                                                           ---------
Liabilities assumed......................................  $  21,827
                                                           =========


    In 1998, the Company purchased all of the common stock of MDI for cash
consideration of approximately $31,166. In connection with the acquisition,
liabilities were assumed as follows:


                                                         
Fair value of assets acquired.............................  $ 40,076
Cash paid for common stock................................   (31,166)
                                                            --------
Liabilities assumed.......................................  $  8,910
                                                            ========


    In 1998, SMT purchased all of the common stock of RIA Management Services,
Inc. for cash consideration of approximately $2,135. In connection with the
acquisition, liabilities were assumed as follows:


                                                          
Fair value of assets acquired..............................  $ 3,366
Cash paid for common stock.................................   (2,135)
                                                             -------
Liabilities assumed........................................  $ 1,231
                                                             =======


    In 1998, the Company purchased all of the equity interests in two operating
subsidiaries of American Shared Hospital Services for cash consideration of
approximately $29,967. In connection with the acquisition, liabilities were
assumed as follows:


                                                         
Fair value of assets acquired.............................  $ 46,706
Cash paid for equity interests............................   (29,967)
                                                            --------
Liabilities assumed.......................................  $ 16,739
                                                            ========


    In 2000, the Company purchased all of the common stock of Southeast Arizona,
Inc. ("SEA") as well as a mobile MRI system from an affiliate of SEA for cash
consideration of $4,050. In connection with the acquisition, no liabilities were
assumed.

                            SEE ACCOMPANYING NOTES.

                                      F-8

                             ALLIANCE IMAGING, INC.

                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT

                             (DOLLARS IN THOUSANDS)



                                                            ADDITIONAL      NOTE
                                        COMMON STOCK         PAID-IN     RECEIVABLE                     TOTAL
                                    ---------------------    CAPITAL        FROM      ACCUMULATED   STOCKHOLDERS'
                                      SHARES      AMOUNT    (DEFICIT)     OFFICER       DEFICIT        DEFICIT
                                    ----------   --------   ----------   ----------   -----------   -------------
                                                                                  
Balance at December 31, 1997......   5,698,549     $ 57     $ (24,970)      $  --       $(22,991)     $ (47,904)

  Exercise of common stock
    options.......................      18,500       --            66          --             --             66
  Employee stock option rollover
    value.........................          --       --           100          --             --            100
  Series F preferred stock
    dividend accrued and
    accretion.....................          --       --            --          --         (2,186)        (2,186)
  Net income......................          --       --            --          --          6,597          6,597
                                    ----------     ----     ---------       -----       --------      ---------
Balance at December 31, 1998......   5,717,049       57       (24,804)         --        (18,580)       (43,327)

  Exercise of common stock
    options.......................      60,594        1           506          --             --            507
  Repurchase of common stock......  (5,405,742)     (54)     (302,499)         --             --       (302,553)
  Issuance of common stock........   3,426,957       34       191,768          --             --        191,802
  Series F preferred stock
    dividend accrued and
    accretion.....................          --       --            --          --         (2,081)        (2,081)
  Repurchase of Series F preferred
    stock.........................          --       --        (2,796)         --             --         (2,796)
  Net loss........................          --       --            --          --        (43,451)       (43,451)
                                    ----------     ----     ---------       -----       --------      ---------
Balance at December 31, 1999......   3,798,858       38      (137,825)         --        (64,112)      (201,899)

  Exercise of common stock
    options.......................       2,618       --            28          --             --             28
  Issuance of common stock to an
    executive officer.............       5,360       --           300        (300)            --             --
  Non-cash stock based
    compensation..................          --       --           265          --             --            265
  Net loss........................          --       --            --          --         (2,203)        (2,203)
                                    ----------     ----     ---------       -----       --------      ---------
Balance at December 31, 2000......   3,806,836       38      (137,232)       (300)       (66,315)      (203,809)
  Non-cash stock based
    compensation..................          --       --           129          --             --            129
  Net income......................          --       --            --          --          1,237          1,237
                                    ----------     ----     ---------       -----       --------      ---------
Balance at March 31, 2001
  (unaudited).....................   3,806,836     $ 38     $(137,103)      $(300)      $(65,078)     $(202,443)
                                    ==========     ====     =========       =====       ========      =========


                            SEE ACCOMPANYING NOTES.

                                      F-9

                             ALLIANCE IMAGING, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

1.  DESCRIPTION OF THE COMPANY AND BASIS OF FINANCIAL STATEMENT PRESENTATION

    DESCRIPTION OF THE COMPANY--Alliance Imaging, Inc. and its subsidiaries (the
"Company") provide diagnostic imaging and therapeutic systems and related
technical support services, as well as management services, to hospitals and
other health care providers. Diagnostic imaging services are provided on both a
mobile, shared-user basis as well as on a full-time basis to single customers.
The Company operates entirely within the United States and is one of the largest
outsourced providers of magnetic resonance imaging ("MRI") services in the
country.

    PRINCIPLES OF CONSOLIDATION AND BASIS OF FINANCIAL STATEMENT
PRESENTATION--The accompanying consolidated financial statements of the Company
include the assets, liabilities, revenues and expenses of all majority owned
subsidiaries over which the Company exercises control, and for which control is
other than temporary. Significant intercompany transactions have been
eliminated. Investments in non-consolidated affiliates (20-50 percent owned
companies and majority owned entities over which the Company does not possess
control) are accounted for under the equity method. The consolidated financial
statements have been prepared in accordance with accounting principles generally
accepted in the United States of America.

    1999 RECAPITALIZATION MERGER--On November 2, 1999, after obtaining approval
of the stockholders, the Company completed a series of transactions contemplated
by an Agreement and Plan of Merger between Viewer Acquisition Corp. ("Viewer")
and the Company (the "1999 Recapitalization Merger") whereby the Company:
obtained proceeds from debt financing aggregating $726,000; issued 3,426,957
shares of its common stock in exchange for all of the outstanding stock of
Viewer and received net proceeds of $191,803; and converted all shares of its
common stock held by existing stockholders in excess of 284,412 shares that were
retained by an affiliate of Apollo Management, L.P., ("Apollo") into the right
to receive approximately $56 per share in cash. The Company used the cash
proceeds from these transactions to fund: the purchase of its common stock from
existing stockholders--$302,553; purchase of outstanding stock options--$17,082;
repayment of existing debt--$526,858; transaction costs charged to
expense--$25,423; deferred debt financing fees--$17,149; redemption of series F
preferred stock--$21,550; and an increase in the Company's cash balance of
$7,188.

    As a result of these transactions, the Company experienced an approximate
92% ownership change. Viewer, which was formed and is wholly owned by certain
affiliates of Kohlberg Kravis Roberts & Co. ("KKR") obtained ownership of
approximately 92% of the Company's outstanding common stock, and the Company
refinanced substantially all of its long-term debt. The Company paid $12,140 to
KKR for professional services rendered in connection with the 1999
Recapitalization Merger. The 1999 Recapitalization Merger and related
transactions have been treated as a leveraged recapitalization in which the
issuance and retirement of debt have been accounted for as financing
transactions, the sale and purchases of the Company's stock have been accounted
for as capital transactions at amounts received from or paid to stockholders,
and no changes were made to the carrying values of the Company's assets and
liabilities that were not directly impacted by the transactions.

    COMMON CONTROL MERGER--On May 13, 1999, the Company acquired all of the
outstanding common stock of Three Rivers Holding Corp. ("Three Rivers"), the
parent corporation of SMT Health Services, Inc. ("SMT"), in a stock-for-stock
merger (the "SMT Merger"). The Company exchanged

                                      F-10

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

1.  DESCRIPTION OF THE COMPANY AND BASIS OF FINANCIAL STATEMENT PRESENTATION
(CONTINUED)
1,644,438 shares of common stock for all the outstanding common shares of Three
Rivers. At the time of the SMT Merger, Three Rivers was wholly owned by
affiliates of Apollo, which held approximately 82.6% of the Company's
outstanding common stock. Accordingly, the SMT Merger has been accounted for as
a reorganization of entities under common control in a manner similar to a
pooling of interests. As such, the accompanying financial statements and
footnotes have been restated to include the assets, liabilities and operations
of SMT from the date when both entities were under Apollo's control, which was
December 18, 1997.

    In connection with the SMT Merger in 1999, the Company amended and restated
its previous credit agreement to add a new $70,000 tranche D term loan facility
which was used to fund: repayment of SMT's existing indebtedness--$62,044;
payment on the Company's previous revolving loan facility--$6,000; transaction
costs charged to expense--$851; deferred financing costs--$650; and an increase
in the Company's cash balance of $455. The Company recorded an extraordinary
loss of $2,240 (net of taxes of $1,515) associated with the write-off of
unamortized deferred financing costs of $1,753 on SMT's existing indebtedness
and $2,002 on Alliance's tranche C term loan facility under its previous credit
agreement.

    Also in connection with the SMT Merger, the Company established a severance
accrual of $2,164, an office lease termination accrual of $230, and a fixed
asset disposal reserve of $241. All of the preceding amounts were charged to
transaction related costs. Of these amounts, $1,641 and zero were included in
other accrued liabilities as of December 31, 1999 and 2000, respectively.

    TERMINATION AND RELATED COSTS--Termination and related costs for the year
ended December 31, 2000 represent $4,232 associated with termination costs and
the cash-out of stock options for an executive officer who resigned due to
health-related issues and $341 associated with the recruitment of his
replacement.

    RECAPITALIZATION, MERGER INTEGRATION AND REGULATORY COSTS--Recapitalization,
merger integration and regulatory costs for the year ended December 31, 2000
represent $704 of professional fees paid in connection with the 1999
Recapitalization Merger, $570 of compensatory costs related to stock option
buy-backs and severance payments resulting from change in control provisions
triggered by the 1999 Recapitalization Merger, $154 related to additional
severance for employees of SMT, $123 of integration costs to migrate acquired
entities to a common systems platform for direct patient billing, and $850 for
assessments and $2,122 for costs and related professional fees to settle
regulatory matters associated with the direct patient billing process of one of
the Company's acquired entities.

    Recapitalization, merger integration and regulatory costs for the year ended
December 31, 1999, represent $19,640 in professional fees paid in connection
with the 1999 Recapitalization Merger, $17,082 related to the purchase of
outstanding stock options in connection with the 1999 Recapitalization Merger,
$6,003 in bonus payments paid in connection with the 1999 Recapitalization
Merger, $1,088 in provisions to conform the accounting policies with respect to
accounts receivable reserves, as well as employee vacation and sick pay reserves
in connection with the SMT Merger, $2,164 in employee severance costs in
connection with the SMT Merger, $3,075 in professional fees and other merger
integration costs associated with the SMT Merger and other acquired entities,
and $3,529

                                      F-11

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

1.  DESCRIPTION OF THE COMPANY AND BASIS OF FINANCIAL STATEMENT PRESENTATION
(CONTINUED)
for assessments to settle regulatory matters associated with the direct patient
billing process of one of the Company's acquired entities.

    Recapitalization, merger integration and regulatory costs for the year ended
December 31, 1998 represents $1,846 in special non-recurring bonuses paid in
connection with the MTI acquisition, $722 in professional fees associated with
accounting and billing systems conversions of acquired companies, and $250 in a
provision for doubtful accounts conforming accounting adjustment made in
connection with the American Shared acquisition.

    UNAUDITED CONDENSED INTERIM FINANCIAL STATEMENTS--The unaudited condensed
financial statements as of March 31, 2001 and for the three months ended
March 31, 2000 and 2001 have been prepared in accordance with generally accepted
accounting principles and rules and regulations of the Securities and Exchange
Commission for interim financial information. Accordingly, they do not include
all of the information and footnotes required by generally accepted accounting
principles for complete financial statements. In the opinion of management, all
adjustments (consisting of normal recurring accruals) considered necessary for a
fair presentation have been included. Operating results for the three-month
period ended March 31, 2001 are not necessarily indicative of the results that
may be expected for the year ending December 31, 2001. Certain reclassifications
have been made in the 2000 financial statements to conform to the 2001
presentation.

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    CASH AND CASH EQUIVALENTS--The Company considers short-term investments with
original maturities of three months or less to be cash equivalents.

    ACCOUNTS RECEIVABLE--The Company provides shared and single-user diagnostic
imaging equipment and technical support services to the healthcare industry and
directly to patients on an outpatient basis. Substantially all of the Company's
accounts receivable are due from hospitals, other healthcare providers and
health insurance providers located throughout the United States. Services are
generally provided pursuant to long-term contracts with hospitals and other
healthcare providers or directly to patients, and generally collateral is not
required. Receivables generally are collected within industry norms for
third-party payors. Estimated credit losses are provided for in the consolidated
financial statements and losses experienced have been within management's
expectations.

    CONCENTRATION OF CREDIT RISK--Financial instruments which potentially
subject the Company to a concentration of credit risk principally consists of
cash, cash equivalents and trade receivables. The Company invests available cash
in money market securities of high-credit-quality financial institutions. At
December 31, 1999 and 2000, the Company's accounts receivable were primarily
from clients in the healthcare industry. To reduce credit risk, the Company
performs periodic credit evaluations of its clients, but does not generally
require advance payments or collateral. Credit losses to clients in the health
care industry have not been material.

    EQUIPMENT--Equipment is stated at cost and is generally depreciated using
the straight-line method over an initial estimated life of three to eight years
to an estimated residual value, generally between five and twenty percent of
original cost. If the Company continues to operate the equipment

                                      F-12

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
beyond its initial estimated life, the residual value is then depreciated to a
nominal salvage value over three years.

    Routine maintenance and repairs are charged to expense as incurred. Major
repairs and purchased software and hardware upgrades, which extend the life of
or add value to the equipment, are capitalized and depreciated over the
remaining useful life.

    With the exception of a small amount of office furniture, office equipment
and leasehold improvements, substantially all of the property owned by the
Company relates to diagnostic imaging equipment, tractors and trailers used in
the business.

    GOODWILL, LONG-LIVED ASSETS, AND OTHER INTANGIBLES--The Company amortizes
goodwill and other intangibles using the straight-line method over a period of
four to twenty-five years. For acquired entities, the amortization period
selected is primarily based upon the estimated life of the customer contracts,
including expected renewals, and other related assets acquired, not to exceed
twenty years. The Company evaluates the potential impairment of goodwill and
other intangibles on an ongoing basis. Additionally, the Company reviews its
long-lived assets and related intangibles for impairment whenever events or
changes in circumstances indicate that the carrying amount of an asset may not
be recoverable. The recoverability test is performed at the lowest level at
which net cash flows can be directly attributable to long-lived assets and is
performed on an undiscounted basis. For any assets identified as impaired, the
Company measures the impairment as the amount by which the carrying value of the
asset exceeds the fair value of the asset. In estimating the fair value of the
asset, management utilizes a valuation technique based on the present value of
expected future cash flows.

    REVENUE RECOGNITION--The majority of the Company's revenues are derived
directly from health care providers. To a lesser extent, revenues are generated
from direct billings to patients or their medical payors which are recorded net
of contractual discounts and other arrangements for providing services at less
than established patient billing rates. Revenues from direct patient billing
amounted to approximately 11%, 12% and 10% of revenues in the years ended
December 31, 1998, 1999, and 2000, respectively. No single customer accounted
for more than 3% or more of consolidated revenues in each of the three years in
the period ended December 31, 2000. All revenues are recognized at the time the
service is performed.

    INCOME TAXES--The provision for income taxes is determined in accordance
with Statement of Financial Accounting Standards No. 109, "Accounting for Income
Taxes." Deferred tax assets and liabilities are determined based on the
temporary differences between the financial reporting and tax bases of assets
and liabilities, applying enacted statutory tax rates in effect for the year in
which the differences are expected to reverse. Future tax benefits are
recognized only to the extent that the realization of such benefits is
considered to be more likely than not.

    FAIR VALUES OF FINANCIAL INSTRUMENTS--The carrying amount reported in the
balance sheet for cash and cash equivalents approximates fair value based on the
short-term maturity of these instruments. The carrying amounts reported in the
balance sheet for accounts receivable and accounts payable approximate fair
value based on the short-term nature of these accounts. The carrying amount
reported

                                      F-13

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
in the balance sheet for long-term debt approximates fair value as these
borrowings have variable rates that reflect currently available terms and
conditions for similar debt.

    USE OF ESTIMATES--The preparation of financial statements in conformity with
accounting principles generally accepted in the United States of America
requires management to make estimates and assumptions that affect the amounts
reported in the financial statements and accompanying notes. Actual results
could differ from those estimates.

    RECLASSIFICATIONS--Certain reclassifications have been made in the 1998 and
1999 financial statements to conform to the 2000 presentation.

    COMPREHENSIVE INCOME--Effective January 1, 1998, the Company adopted
Statement of Financial Accounting Standards No. 130, "Reporting Comprehensive
Income" ("SFAS 130"), which establishes standards for reporting and displaying
comprehensive income and its components in the financial statements. For the
years ended December 31, 1998, 1999 and 2000, the Company did not have any
components of other comprehensive income as defined in SFAS 130. Therefore,
statements of comprehensive income have not been presented.

    SEGMENT REPORTING--Effective January 1, 1998, the Company adopted Statement
of Financial Accounting Standards No. 131, "Disclosures about Segments of an
Enterprise and Related Information" ("SFAS 131"). Management reviews the
operating results of the Company's nine regional offices for the purpose of
making operating decisions and assessing performance. Based on the aggregation
criteria in SFAS 131, the Company has aggregated the results of its nine
regional offices into one reportable segment.

    DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES--Effective January 1, 2001,
the Company adopted Statement of Financial Accounting Standards No. 133,
"Accounting for Derivative and Hedging Activities", as amended ("SFAS 133").
This statement establishes a new model for accounting for derivatives and
hedging activities. Under SFAS 133, all derivatives must be recognized as assets
and liabilities and measured at fair value. The Company currently does not have
any derivative instruments which require fair value measurement under SFAS 133
and, accordingly, the effect of the adoption will not have a material impact on
its results of operations or financial position.

    RECENT ACCOUNTING PRONOUNCEMENTS--In December 1999, the staff of the
Securities and Exchange Commission issued Staff Accounting Bulletin No. 101,
"Revenue Recognition in Financial Statements" ("SAB 101"). SAB 101 provides
guidance on applying generally accepted accounting principles to revenue
recognition issues in financial statements. The adoption of SAB 101 had no
impact on the Company's results of operations or financial position.

    In March 2000, the FASB issued FASB Interpretation No. 44 ("FIN 44"),
"Accounting for Certain Transactions Involving Stock Compensation". FIN 44
clarifies the application of Accounting Principles Board ("APB") Opinion No. 25
regarding (a) the definition of employee for purposes of applying APB Opinion
No. 25, (b) the criteria for determining whether a stock option plan qualifies
as a non-compensatory plan, (c) the accounting consequence of various
modifications to the terms of a previously fixed stock option or award, and
(d) the accounting for an exchange of stock compensation

                                      F-14

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
awards in a business combination. FIN 44 is effective July 1, 2000, but certain
conclusions cover specific events that occurred after either December 25, 1998,
or January 12, 2000. The Company believes that the adoption of FIN 44 will not
have a material effect on its consolidated results of operations or financial
position.

3.  ACQUISITIONS

    On November 1, 2000, the Company acquired all of the outstanding common
stock of Southeast Arizona, Inc. ("SEA") as well as a mobile MRI system from an
affiliate of SEA. The acquisition was accounted for as a purchase and
accordingly, the results of operations of SEA have been included in the
Company's consolidated financial statements from the date of acquisition. The
purchase price consisted of $4,050 in cash plus direct acquisition costs of $13.
The acquisition was financed using the Company's available cash. The goodwill
recorded as a result of this acquisition was $2,563, which is being amortized
using the straight-line method over 20 years. The allocation of the SEA purchase
price is tentative pending the completion of fair value determinations for the
net assets acquired. The allocation may change with the completion of these
determinations.

    On January 2, 1998, Canton Holding Corp., a wholly owned subsidiary of SMT,
acquired all of the outstanding common stock of Mid American Imaging, Inc.
("MAI") and Dimensions Medical Group, Inc. ("DMG"). The acquisition was
accounted for as a purchase and accordingly, the results of operations of MAI
and DMG have been included in the Company's consolidated financial statements
from the date of acquisition. The purchase price consisted of approximately
$10,400 in cash plus the assumption of approximately $5,100 in financing
arrangements. The acquisition was primarily funded by an $11,500 borrowing on
SMT's revolving loan facility that was also used to refinance $843 of existing
MAI and DMG indebtedness. The goodwill recorded as a result of this acquisition
was $10,620, which is being amortized using the straight-line method over
20 years.

    On March 12, 1998, the Company acquired Mobile Technology Inc. ("MTI"). The
purchase price consisted of $58,300 for all of the equity interests in MTI, plus
direct acquisition costs of approximately $2,000. In connection with the
acquisition, the Company also refinanced $37,400 of MTI's outstanding debt and
paid MTI direct transaction costs of $3,500. The transaction has been accounted
for as a purchase and, accordingly, the results of operations of MTI have been
included in the Company's consolidated financial statements from the date of
acquisition. The goodwill recorded as a result of this acquisition was $29,974,
which is being amortized on a straight-line basis over 20 years. Additionally,
the Company assigned $67,200 of the purchase price to customer contracts and
$2,870 of the purchase price to assembled work force. The amounts are being
amortized on a straight-line basis over 20 and four years respectively. The
allocation of the intangible assets acquired was based on an independent
valuation study.

    On May 19, 1998, the Company acquired Medical Diagnostics, Inc. ("MDI"), a
subsidiary of U. S. Diagnostic, Inc. The purchase price consisted of
approximately $31,000 plus the assumption of approximately $7,400 in financing
arrangements. The transaction has been accounted for as a purchase and,
accordingly, the results of operations of MDI have been included in the
Company's consolidated financial statements from the date of acquisition. The
goodwill recorded as a result of this acquisition

                                      F-15

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

3.  ACQUISITIONS (CONTINUED)
was $17,776, which is being amortized on a straight-line basis over 20 years.
Additionally, the Company assigned $8,300 of purchase price to customer
contracts and $350 of purchase price to assembled work force. The amounts are
being amortized on a straight-line basis over 20 and four years respectively.
The allocation of the intangibles assets acquired was based on an independent
valuation study.

    On August 17, 1998, SMT acquired all of the outstanding common stock of RIA
Management Services, Inc. ("RIA"). The acquisition was accounted for as a
purchase and, accordingly, the results of operations of RIA have been included
in the Company's consolidated financial statements from the date of acquisition.
The purchase price consisted of approximately $2,100 in cash plus the assumption
of approximately $1,100 in financing arrangements. The acquisition was primarily
funded from operating cash on hand and a $1,000 borrowing on SMT's revolving
loan facility. The goodwill recorded as a result of this acquisition was $1,920,
which is being amortized using the straight-line method over 20 years.

    On November 13, 1998, two wholly owned subsidiaries of the Company acquired
all of the outstanding common stock of CuraCare, Inc. and all of the partnership
interests in American Shared-CuraCare (collectively, "American Shared"). The
purchase price consisted of $13,377 plus the assumption of $12,241 in financing
arrangements. In connection with the acquisition, the Company also refinanced
$13,130 of American Shared's outstanding debt. The transaction has been
accounted for as a purchase and, accordingly, the results of operations of
American Shared have been included in the Company's consolidated financial
statements from the date of acquisition. The goodwill recorded as a result of
this acquisition was $26,940 which is being amortized on a straight-line basis
over 20 years. Additionally, the Company assigned $3,300 of the purchase price
to customer contracts and $690 of the purchase price to assembled work force
which is being amortized on a straight-line basis over ten and four years
respectively. The allocation of the intangible assets acquired was based on an
independent valuation study.

    The following unaudited pro forma information presents combined results of
operations as if the SEA acquisition had occurred at the beginning of 1999 and
2000. The unaudited pro forma information is not necessarily indicative of the
results of operations of the combined company had the acquisitions actually
occurred at the beginning of the periods presented, nor is it necessarily
indicative of future results.



                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1999       2000
                                                              --------   --------
                                                                   
Revenues....................................................  $320,456   $347,859
Loss before extraordinary loss..............................   (25,331)    (1,715)
Net loss....................................................   (43,097)    (1,715)

Earnings (loss) per share:
  Basic.....................................................  $  (8.85)  $  (0.45)
  Diluted...................................................  $  (8.85)  $  (0.45)


                                      F-16

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

4.  OTHER ACCRUED LIABILITIES

    Other accrued liabilities consisted of the following:



                                                                 DECEMBER 31,        MARCH 31,
                                                              -------------------   -----------
                                                                1999       2000        2001
                                                              --------   --------   -----------
                                                                                    (UNAUDITED)
                                                                           
Accrued systems rental and maintenance costs................  $ 4,245    $ 4,092      $ 3,602
Accrued site rental fees....................................    1,146      1,015        1,095
Accrued taxes payable.......................................    5,773      7,978        9,527
Accrued regulatory costs....................................    3,500      4,350        2,052
Accrued severance and related costs.........................    1,641      1,116          290
Other accrued expenses......................................    6,259      4,637        3,141
                                                              -------    -------      -------
Total.......................................................  $22,564    $23,188      $19,707
                                                              =======    =======      =======


5.  LONG-TERM DEBT AND SENIOR SUBORDINATED CREDIT FACILITY

    Long-term debt consisted of the following:



                                                                 DECEMBER 31,        MARCH 31,
                                                              -------------------   -----------
                                                                1999       2000        2001
                                                              --------   --------   -----------
                                                                                    (UNAUDITED)
                                                                           
Term loan facility under the 1999 Credit Agreement, due in
  annual installments commencing 2001 through 2008, interest
  payable as defined........................................  $466,000   $466,000    $466,000
Senior subordinated credit facility.........................   260,000    260,000     260,000
Revolving loan facility under the 1999 Credit Agreement.....        --     18,000      28,000
Obligations to lending institutions, secured by equipment,
  due in monthly installments through February 2005 with
  weighted-average interest rates of 9.29% and 9.33% at
  December 31, 1999 and 2000, respectively..................    25,849     14,989      20,124
                                                              --------   --------    --------
                                                               751,849    758,989     774,124
Less current portion........................................    12,974     15,863      17,015
                                                              --------   --------    --------
                                                              $738,875   $743,126    $757,109
                                                              ========   ========    ========


    On March 12, 1998, the Company increased its term loan facility under the
1997 Credit Agreement by $70,000 by increasing its existing tranche A term loan
facility by $20,000 and establishing a new $50,000 tranche B term loan facility.
In connection with this transaction, the Company recorded an extraordinary loss
of $800, net of income tax benefit, on early extinguishment of debt. On
September 24, 1998, the Company completed a $90,000 expansion of its 1997 Credit
Agreement. The transaction added a new $85,000 tranche C term loan facility and
increased the revolving loan facility to $80,000. In connection with this
transaction, the Company recorded an extraordinary loss of $1,471, net of income
tax benefit, on early extinguishment of debt. On May 13, 1999, in connection
with the SMT Merger, the Company amended and restated its 1997 Credit Agreement
to add a new $70,000

                                      F-17

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

5.  LONG-TERM DEBT AND SENIOR SUBORDINATED CREDIT FACILITY (CONTINUED)
tranche D term loan facility. In connection with this transaction, the Company
recorded an extraordinary loss of $2,240, net of income tax benefit, on early
extinguishment of debt.

    On November 2, 1999, in connection with the 1999 Recapitalization Merger,
the Company entered into a new $616,000 Credit Agreement (the "1999 Credit
Agreement") consisting of a $131,000 Tranche A Term Loan Facility, a $150,000
Tranche B Term Loan Facility, a $185,000 Tranche C Term Loan Facility, and a
$150,000 Revolving Loan Facility. The 1999 Credit Agreement requires loans to be
prepaid with 100% of the net proceeds of unreinvested asset sales and 50% of
annual consolidated excess cash flow. In addition, the 1999 Credit Agreement
contains restrictive covenants which, among other things, limit the incurrence
of additional indebtedness, dividends, transactions with affiliates, asset
sales, acquisitions, mergers and consolidations, liens and encumbrances, capital
expenditures and prepayments of other indebtedness. As of December 31, 2000, the
Company is in compliance with all covenants under the 1999 Credit Agreement.
Voluntary prepayments are permitted in whole or in part without premium or
penalty. Interest under the term loan facility and revolving loan facility is
variable based on the Company's leverage ratio and changes in specified
published rates and the bank's prime lending rate. The interest rates on the
Tranche A, Tranche B, and Tranche C Term Loan Facilities at December 31, 2000
were 9.25%, 9.94%, and 10.19%, respectively. The weighted average interest rate
on the Revolving Loan Facility at December 31, 2000 was 9.15%. The Company pays
a commitment fee equal to 1/2 of 1% per annum on the undrawn portion available
under the Revolving Loan Facility subject to decreases in certain circumstances.
The Company also pays variable per annum fees in respect of outstanding letters
of credit. The 1999 Credit Agreement is collateralized by the Company's equity
interests in its majority owned subsidiaries, partnerships and limited liability
companies and its unencumbered assets, which include accounts receivable,
inventory, equipment, and intellectual property.

    In connection with the 1999 Recapitalization Merger, the Company also
entered into a $260,000 Senior Subordinated Credit Facility with KKR. On May 2,
2001, any outstanding balance on the Senior Subordinated Credit Facility will
convert into senior subordinated term notes ("KKR Term Notes") maturing on
November 2, 2009. Voluntary prepayments are permitted in whole or in part
without premium or penalty. Interest under the Senior Subordinated Credit
Facility is at the greater of the three, six or twelve-month U.S. treasury
obligations plus 4% (payable quarterly, reset at twelve months). Interest under
the KKR Term Notes is at a variable rate, which is set annually, equal to the
U.S. treasury obligations maturing on November 2, 2009 plus 9% payable
semi-annually (not to exceed 17%). The interest rate on the Senior Subordinated
Credit Facility was 10.38% at December 31, 2000.

    On November 2, 1999, the Company used a portion of the proceeds from the
1999 Credit Agreement and the Senior Subordinated Credit Facility to pay off its
term loan facility and revolving loan facility under its previous credit
agreement ("1997 Credit Agreement"), its senior subordinated notes, and its
subordinated term securities. In connection with this transaction, the Company
recorded an extraordinary loss of $15,526, net of income tax benefit, which
primarily consisted of consent payments and repurchase premiums on the senior
subordinated notes and subordinated term securities as well as writing off
existing unamortized deferred financing costs.

                                      F-18

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

5.  LONG-TERM DEBT AND SENIOR SUBORDINATED CREDIT FACILITY (CONTINUED)
    The maturities of long-term debt as of December 31, 2000 are as follows:



                                       TERM LOAN
                           ---------------------------------   KKR FACILITY/               EQUIPMENT
                           TRANCHE A   TRANCHE B   TRANCHE C     TERM NOTE     REVOLVER   OBLIGATIONS    TOTAL
                           ---------   ---------   ---------   -------------   --------   -----------   --------
                                                                                   
Year ending December 31:
    2001.................  $  5,000    $  1,500    $  1,850      $     --      $     --     $  7,513    $ 15,863
    2002.................    10,000       1,500       1,850            --            --        4,667      18,017
    2003.................    23,000       1,500       1,850            --            --        2,069      28,419
    2004.................    25,000       1,500       1,850            --            --          444      28,794
    2005.................    32,000       1,500       1,850            --            --          296      35,646
    Thereafter...........    36,000     142,500     175,750       260,000        18,000           --     632,250
                           --------    --------    --------      --------      --------     --------    --------
                           $131,000    $150,000    $185,000      $260,000      $ 18,000     $ 14,989    $758,989
                           ========    ========    ========      ========      ========     ========    ========


    Of the Company's total indebtedness at December 31, 2000, $747,633 is an
obligation of the Company and $11,356 is an obligation of the Company's
consolidated subsidiaries.

6.  PREFERRED STOCK

    On December 18, 1997, the Company authorized 300,000 shares of a new
Series F redeemable preferred stock. The stock was recorded at $14,400
(liquidation value of $15,000 less a financing fee of $600). The financing fee
was being accreted on a straight-line basis over the ten-year term of the stock.
The holders of the Series F redeemable preferred stock were entitled to receive
cumulative dividends at the rate of 13.5% per annum of the stated liquidation
value. Unpaid dividends accumulated and were payable quarterly by the Company in
kind for the first five years after issuance, and thereafter in cash. In
connection with the 1999 Recapitalization Merger (SEE NOTE 1), the Company
repurchased all outstanding shares of Series F redeemable preferred stock at a
premium of $2,796 which was recorded to additional paid-in capital in
November 1999. The Company's amended and restated certificate of incorporation
no longer provides for the issuance of preferred stock.

                                      F-19

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

7.  STOCKHOLDERS' DEFICIT

    EARNINGS (LOSS) PER COMMON SHARE:  The following table sets forth the
computation of basic and diluted earnings (loss) per share (amounts in
thousands, except per share amounts):



                                                                                       THREE MONTHS
                                                      YEARS ENDED DECEMBER 31,        ENDED MARCH 31,
                                                   ------------------------------   -------------------
                                                     1998       1999       2000       2000       2001
                                                   --------   --------   --------   --------   --------
                                                                                        (UNAUDITED)
                                                                                
Numerator:
Income (loss) before extraordinary loss..........  $ 8,868    $(25,685)  $(2,203)    $1,424     $1,237
Preferred stock dividends and financing fee
  accretion......................................   (2,186)     (2,081)       --         --         --
Excess of consideration paid over carrying amount
  of preferred stock repurchased.................       --      (2,796)       --         --         --
                                                   -------    --------   -------     ------     ------
Numerator for basic and diluted earnings per
  share--income (loss) available to common
  stockholders before extraordinary loss.........  $ 6,682    $(30,562)  $(2,203)    $1,424     $1,237
                                                   =======    ========   =======     ======     ======

Denominator:
Denominator for basic earnings per
  share--weighted-average shares.................    5,711       5,421     3,800      3,799      3,807
Effect of dilutive securities:
Employee stock options...........................      210          --        --        149        233
                                                   -------    --------   -------     ------     ------
Denominator for diluted earnings per
  share--adjusted weighted-average shares........    5,921       5,421     3,800      3,948      4,040
                                                   =======    ========   =======     ======     ======

Basic earnings (loss) per share before
  extraordinary loss.............................  $  1.17    $  (5.64)  $ (0.58)    $ 0.37     $ 0.32
                                                   =======    ========   =======     ======     ======
Diluted earnings (loss) per share before
  extraordinary loss.............................  $  1.13    $  (5.64)  $ (0.58)    $ 0.36     $ 0.31
                                                   =======    ========   =======     ======     ======


    The diluted share base for the years ended December 31, 1999 and 2000
excludes incremental shares of 267 and 272, respectively, related to employee
stock options. These shares are excluded due to their antidilutive effect as a
result of the Company's net loss for the years ended December 31, 1999 and 2000.

    STOCK OPTIONS AND AWARDS--The Company has elected to follow Accounting
Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees"
("APB 25") and related interpretations in accounting for its employee stock
options because, as discussed below, the alternative fair value accounting
provided for under Statement of Financial Accounting Standards No. 123,
"Accounting for Stock-Based Compensation" ("SFAS 123") requires use of option
valuation models that were not developed for use in valuing employee stock
options.

    The Company's 1991 Stock Option Plan, which was terminated effective
November 2, 1999 in connection with the 1999 Recapitalization Merger, provided
that up to 2,000,000 shares may be granted

                                      F-20

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

7.  STOCKHOLDERS' DEFICIT (CONTINUED)
to management and key employees. Options were granted at their fair market value
at the date of grant. All options granted have 10-year terms and become fully
exercisable at the end of 3 to 4 years of continued employment. No options
granted pursuant to this 1991 Stock Option Plan were outstanding as of
December 31, 1999 and 2000.

    In December 1997, the Company adopted a new employee stock option plan
pursuant to which options with respect to a total of 468,545 shares of the
Company's common stock will be available for grant. Options are granted at their
fair value at the date of grant. All options have 10-year terms. Fifty percent
of the options vest in equal increments over four years and fifty percent vest
after seven and one-half years (subject to acceleration if certain per-share
equity targets are achieved).

    In connection with the SMT Merger, outstanding employee stock options under
the 1997 Three Rivers Stock Option Plan were converted into options to acquire
shares of the Company's common stock. The Three Rivers stock option plan allows
for options with respect to a total of 282,520 shares of the Company's common
stock to be available for grant. Options are granted at their fair value at the
date of grant. All options have 10-year terms. Fifty percent of the options vest
in equal increments over four years and fifty percent vest after seven and
one-half years (subject to acceleration if certain per-share equity targets are
achieved).

    In 1999, the Company adopted a new non-employee directors' stock option plan
pursuant to which options with respect to a total of 50,000 shares of the
Company's common stock will be available for grant. Options are granted at their
fair value at the date of grant. All options have 10-year terms. Ten percent of
the options vest upon grant, eighty percent of the options vest over four years
and the remaining ten percent vest in the fifth year. This plan was terminated
effective November 2, 1999 in connection with the 1999 Recapitalization Merger.
No options granted pursuant to this 1999 non-employee directors' stock option
plan were outstanding as of December 31, 1999 and 2000.

    In connection with the 1999 Recapitalization Merger (SEE NOTE 1), the
Company adopted a new employee stock option plan pursuant to which options with
respect to a total of 632,500 shares of the Company's common stock will be
available for grant. Options are granted at their fair value at the date of
grant, except as noted below. All options have 10-year terms. Fifty percent of
the options vest in equal increments over five years and fifty percent vest
after eight years (subject to acceleration if certain per-share equity targets
are achieved). In November 2000, the Company granted 86,500 options to certain
employees at exercise prices below the fair value of the Company's common stock.
The exercise price of these options and the fair value of the Company's common
stock on the grant date was $56 and $95 per share, respectively. The
compensation expense of $3,395 is being recognized on a straight-line basis over
the vesting period of the options. For the year ended December 31, 2000, the
Company recorded non-cash compensation of $55 with an offset to additional
paid-in deficit.

                                      F-21

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

7.  STOCKHOLDERS' DEFICIT (CONTINUED)
    The weighted average remaining contractual life of options outstanding as of
December 31, 1999 and 2000 is 9.12 and 8.45 years, respectively. The following
table summarizes the Company's stock option activity:



                                                                WEIGHTED AVERAGE
                                                      SHARES     EXERCISE PRICE
                                                     --------   ----------------
                                                          
Outstanding at December 31, 1997...................   539,810        $12.10
  Granted..........................................   255,724         14.25
  Exercised........................................   (18,500)         3.56
  Canceled.........................................    (3,000)        16.50
                                                     --------
Outstanding at December 31, 1998...................   774,034         13.00
  Granted..........................................   534,300         53.93
  Exercised........................................   (60,594)         8.36
  Redeemed for cash................................  (403,166)        13.60
  Canceled.........................................   (14,203)        22.09
                                                     --------
Outstanding at December 31, 1999...................   830,371         39.23
  Granted..........................................    86,500         55.97
  Exercised........................................    (2,618)        11.00
  Redeemed for cash................................   (95,544)        11.45
  Canceled.........................................   (11,400)        55.97
                                                     --------
Outstanding at December 31, 2000...................   807,309        $44.17
                                                     ========


    Of the 807,309 options outstanding at December 31, 2000, 162,377 of these
options had an exercise price of $11.00; 12,950 had an exercise price of $16.50;
36,975 had an exercise price of $20.41; 9,000 had an exercise price of $22.00;
9,207 had an exercise price of $45.92; and 576,800 had an exercise price of
$55.97.

    The number of options exercisable at December 31, 1998, 1999 and 2000 were
293,950, 306,171 and 268,289, respectively, at weighted average exercise prices
of $9.94, $13.88 and $22.35, respectively.

    SFAS 123 requires presentation of pro forma information regarding net income
and earnings per share determined as if the Company has accounted for its
employee stock options granted subsequent to December 31, 1994 under the fair
value method of that Statement. The fair value for these options was estimated
as of the date of grant using the Black-Scholes option pricing model with the
following weighted average assumptions for 1998, 1999, and 2000, respectively:
risk-free interest rates of 5.23%, 6.13%, and 5.70%; no dividend yield;
volatility factors of the expected market price of the Company's common stock of
 .83, zero, and zero; and a weighted average expected life of the options of
5.75, 6.44, and 6.50 years. Volatility of zero for 1999 and 2000 was used as the
Company ceased to be a public entity as a result of the 1999 Recapitalization
Merger. The weighted average fair value of options granted during 1998, 1999,
and 2000 is $10.26, $17.58, and $56.44, respectively.

    The Black-Scholes option valuation model was developed for use in estimating
the fair value of traded options, which have no vesting restrictions and are
fully transferable. In addition, option

                                      F-22

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

7.  STOCKHOLDERS' DEFICIT (CONTINUED)
valuation models require the input of highly subjective assumptions including
the expected stock price volatility. Because the Company's employee stock
options have characteristics significantly different from those of traded
options, and because changes in the subjective input assumptions can materially
affect the fair value estimate, in management's opinion, the existing models do
not necessarily provide a reliable single measure of the fair value of its
employee stock options.

    For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the options' expected vesting period. The
Company's pro forma information for the years ended December 31 are as follows:



                                                                1998       1999       2000
                                                              --------   --------   --------
                                                                           
Pro forma net income (loss).................................   $6,114    $(29,199)  $(3,083)
Pro forma earnings (loss) per share.........................     0.69       (6.29)    (0.81)
Pro forma earnings (loss) per share--assuming dilution......     0.66       (6.29)    (0.81)


    DIRECTORS' DEFERRED COMPENSATION PLAN--Effective January 1, 2000, the
Company established a Directors' Deferred Compensation Plan (the "Director
Plan") for all non-employee directors. Each of the four non-employee directors
has elected to participate in the Director Plan and have their annual fee of $25
deferred into a stock account and converted quarterly into Phantom Shares. Upon
retirement, separation from the Board of Directors, or the occurrence of a
change of control, each director has the option of being paid cash or issued
common stock for their Phantom Shares. Upon issuance of the Phantom Shares, the
Company recorded non-cash compensation of $68 with an offset to other accrued
liabilities for the difference between the fair market value and the issuance
price of the Phantom Shares. At December 31, 2000, $168 was included in other
accrued liabilities relating to the Director Plan.

8.  COMMITMENTS AND CONTINGENCIES

    The Company has contracts with its equipment vendors for comprehensive
maintenance and cryogen coverage for its MRI and CT systems. The contracts are
between one and six years from inception and extend through the year 2004, but
may be canceled by the Company under certain circumstances. Contract payments
are approximately $28,186 per year. At December 31, 2000, the Company had
binding equipment purchase commitments totaling $18,036.

                                      F-23

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

8.  COMMITMENTS AND CONTINGENCIES (CONTINUED)

    The Company leases office and warehouse space and certain equipment under
non-cancelable operating leases. The office and warehouse leases generally call
for minimum monthly payments plus maintenance and inflationary increases. The
future minimum payments under such leases are as follows:


                                                           
Year ending December 31:
  2001......................................................  $ 6,464
  2002......................................................    4,439
  2003......................................................    3,593
  2004......................................................    2,275
  2005......................................................      780
  Thereafter................................................       --
                                                              -------
                                                              $17,551
                                                              =======


    The Company's total rental expense, which includes short-term equipment
rentals, for the years ended December 31, 1998, 1999 and 2000 was $15,530,
$16,075 and $14,723, respectively.

    In late 1999, the Company identified potential deficiencies in certain
billing processes at one of its retail billing locations. In order to quantify
the effect of these deficiencies, the Company conducted a review of the billing
process for the preceding five-year period. As a result of this process, the
Company has accrued $4,350 for probable settlement of this issue, which is
included in other accrued liabilities at December 31, 2000. While actual results
could vary significantly from such settlement, management believes that the
resolution of any billing processes will not have a material adverse effect on
the Company's results of operations or consolidated financial position.

    The Company from time to time is involved in routine litigation and
regulatory matters incidental to the conduct of its business. The Company
believes that resolution of such matters will not have a material adverse effect
on its results of operations or consolidated financial position.

9.  401(k) SAVINGS PLAN

    The Company established a 401(k) Savings Plan (the "Plan") in January 1990.
Effective August 1, 1998, the Plan was amended and restated in its entirety.
Currently, all employees who are over 21 years of age are eligible to
participate after attaining three months of service. Employees may contribute
between 1% and 15% of their annual compensation. The Company matches 50 cents
for every dollar of employee contributions up to 5% of their annual
compensation, subject to the limitations imposed by the Internal Revenue Code.
The Company may also make discretionary contributions depending on
profitability. No discretionary contributions were made in 1998, 1999, or 2000.
The Company incurred and charged to expense $608, $996 and $1,179 during 1998,
1999 and 2000, respectively, related to the Plan.

                                      F-24

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

10.  INCOME TAXES

    The provision for income taxes shown in the consolidated statements of
operations consists of the following:



                                                         YEAR ENDED DECEMBER 31,
                                                      ------------------------------
                                                        1998       1999       2000
                                                      --------   --------   --------
                                                                   
Current:
  Federal...........................................   $ (234)    $ (963)    $ (100)
  State.............................................      453      1,312         99
                                                       ------     ------     ------
                                                          219        349         (1)
Deferred:
  Federal...........................................    6,550      1,985      1,125
  State.............................................    1,967        963        845
                                                       ------     ------     ------
                                                        8,517      2,948      1,970
                                                       ------     ------     ------
                                                       $8,736     $3,297     $1,969
                                                       ======     ======     ======


    Significant components of the Company's net deferred tax assets
(liabilities) at December 31 are as follows:



                                                            1999       2000
                                                          --------   --------
                                                               
Basis differences in fixed assets.......................  $(46,658)  $(61,555)
Basis differences in intangible assets..................   (29,394)   (26,172)
Net operating losses....................................    54,657     64,041
Accounts receivable.....................................     4,347      5,980
State taxes.............................................     3,041      2,899
Accruals not currently deductible for tax purposes......     4,149      4,715
Basis differences associated with acquired
  investments...........................................      (122)    (1,353)
Other...................................................     1,226        721
                                                          --------   --------
  Total deferred taxes..................................    (8,754)   (10,724)
Valuation allowance.....................................   (18,113)   (18,113)
                                                          --------   --------
  Net deferred taxes....................................  $(26,867)  $(28,837)
                                                          ========   ========
Current deferred tax asset..............................  $  8,369   $  3,085
Noncurrent deferred tax liability.......................   (35,236)   (31,922)
                                                          --------   --------
  Net deferred taxes....................................  $(26,867)  $(28,837)
                                                          ========   ========


                                      F-25

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

10.  INCOME TAXES (CONTINUED)
    A reconciliation of the expected total provision for income taxes, computed
using the federal statutory rate on income before extraordinary loss, is as
follows:



                                                        YEAR ENDED DECEMBER 31,
                                                     ------------------------------
                                                       1998       1999       2000
                                                     --------   --------   --------
                                                                  
U.S Federal statutory tax expense (benefit)........   $6,084    $(7,836)    $  (82)
State income taxes, net of federal benefit.........    1,358      1,478        614
Amortization of non-deductible goodwill............    1,713        975        975
Nondeductible recapitalization merger expenses.....       --      8,609        246
Other..............................................     (419)        71        216
                                                      ------    -------     ------
                                                      $8,736    $ 3,297     $1,969
                                                      ======    =======     ======


    As of December 31, 2000, the Company had net operating loss carryforwards of
$167,666 and $88,093 for federal and state income tax purposes, respectively.
The utilization of the majority of these net operating loss carryforwards is
subject to limitation under Section 382 of the Internal Revenue Code. These loss
carryforwards will expire at various dates from 2003 through 2020. As of
December 31, 2000, the Company also had alternative minimum tax credit
carryforwards of $818 with no expiration date.

    The Company maintains a valuation allowance to reduce certain deferred tax
assets to amounts that are in management's estimation more likely than not to be
realized. This allowance primarily relates to the deferred tax assets
established for certain state net operating loss carryforwards as well as net
operating loss carryforwards from the acquisition of MTI which are subject to
limitation. Any reductions in the valuation allowance resulting from realization
of the MTI net operating loss carryforwards will result in a reduction of
goodwill.

11.  RELATED-PARTY TRANSACTIONS

    The Company paid KKR an annual management fee of $122 in 1999 and $650 in
2000, and will continue to receive financial advisory services from KKR on an
ongoing basis. In addition, the Company paid to KKR a fee of $12,140 in
connection with arranging the transactions associated with the 1999
Recapitalization Merger, including the financings thereof (SEE NOTE 1). In
connection with the 1999 Recapitalization Merger, the Company borrowed $260,000
under a Senior Subordinated Credit Facility with KKR (SEE NOTE 5).

    The Company paid Apollo an annual management fee of $750 in 1998 and $628 in
1999. Additionally, in 1998, the Company paid to Apollo fees of $1,000 and $460
as consideration for services rendered in structuring and negotiating the
acquisition of MTI and American Shared, respectively, and also reimbursed Apollo
for expenses of approximately $275 associated with these acquisitions.

    Revenue from management agreements with equity investees was $6,508, $6,308,
and $7,295, during 1998, 1999, and 2000, respectively.

    On November 27, 2000, the Company issued 5,360 shares of common stock to an
officer of the Company in exchange for a $300 secured promissory note, bearing
interest at 6%. Upon issuance of

                                      F-26

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

11.  RELATED-PARTY TRANSACTIONS (CONTINUED)
these shares, the Company recorded non-cash compensation of $210 with an offset
to additional paid-in deficit for the difference between the fair market value
and the issuance price of the shares.

    On September 1, 1999, the Company acquired Acclaim Medical LLC, a California
limited liability company ("Acclaim") from four individuals (the "Sellers") who
each held a 25% equity interest in Acclaim. Two of the Sellers were members of
the immediate family of two executive officers of the Company at the time of the
transaction. The purchase price consisted of $500 in cash ($125 per Seller) plus
warrants to purchase 20% (5% per Seller) of the equity interests in Acclaim as
of August 31, 2001.

12.  QUARTERLY FINANCIAL DATA (UNAUDITED)

    Summarized quarterly unaudited financial data for the years ended
December 31, 1999 and 2000 and for the quarter ended March 31, 2001 is as
follows:



                                                                      THREE MONTHS ENDED
                                          ---------------------------------------------------------------------------
                                          MARCH 31, 1999    JUNE 30, 1999    SEPTEMBER 30, 1999    DECEMBER 31, 1999
                                          ---------------   --------------   -------------------   ------------------
                                                                                       
Revenues................................      $75,741          $80,306             $81,284               $80,775
Income (loss) before income taxes and
  extraordinary loss....................        5,699            4,920               9,578               (42,585)
Extraordinary loss, net of taxes........           --           (2,297)                 --               (15,469)
Net income (loss).......................        2,904              480               5,124               (51,959)
Income (loss) before extraordinary loss
  per common share......................      $  0.40          $  0.38             $  0.78               $ (8.82)
Income (loss) before extraordinary loss
  per common share--assuming dilution...      $  0.38          $  0.36             $  0.74               $ (8.82)




                                                                      THREE MONTHS ENDED
                                          ---------------------------------------------------------------------------
                                          MARCH 31, 2000    JUNE 30, 2000    SEPTEMBER 30, 2000    DECEMBER 31, 2000
                                          ---------------   --------------   -------------------   ------------------
                                                                                       
Revenues................................      $84,322          $86,899             $88,222               $85,844
Income (loss) before income taxes and
  extraordinary loss....................        2,847            2,841              (1,774)               (4,148)
Net income (loss).......................        1,424            1,420                (887)               (4,160)
Income (loss) before extraordinary loss
  per common share......................      $  0.37          $  0.37             $ (0.23)              $ (1.09)
Income (loss) before extraordinary loss
  per common share--assuming dilution...      $  0.36          $  0.36             $ (0.23)              $ (1.09)




                                           THREE MONTHS
                                               ENDED
                                          MARCH 31, 2001
                                          ---------------
                                                                                
Revenues................................      $91,257
Income (loss) before income taxes and
  extraordinary loss....................        2,474
Net income (loss).......................        1,237
Income (loss) before extraordinary loss
  per common share......................      $  0.32
Income (loss) before extraordinary loss
  per common share--assuming dilution...      $  0.31


                                      F-27

                             ALLIANCE IMAGING, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                               DECEMBER 31, 2000

                (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

12.  QUARTERLY FINANCIAL DATA (UNAUDITED) (CONTINUED)
    The earnings (loss) per share amounts for the four quarters of 1999 do not
sum to the annual loss per share amount as a result of the significant decline
in shares outstanding that occurred in the fourth quarter in connection with the
1999 Recapitalization Merger.

    In 1999, Company recorded extraordinary losses on the early extinguishments
of debt related to the KKR recapitalization and SMT debt refinancing.

13. SUBSEQUENT EVENT (UNAUDITED)

    In April 2001, the Company issued $260,000 in senior subordinated notes
("Notes") and used the proceeds to repay its senior subordinated credit facility
with KKR. The Notes bear interest at 10.375% and mature in April 2011. The Notes
contain restrictive covenants which, among other things, limit the incurrence of
additional indebtedness, dividends, transactions with affiliates, asset sales,
acquisitions, mergers and consolidations, liens and encumbrances, and
restrictive payments. The Notes are unsecured senior subordinated obligations
and are subordinated in right of payment to all existing and future senior debt,
including bank debt.

    On June 20, 2001, the Company modified the per-share equity targets of the
stock options as described in Note 7. As a result, the Company may be required
to record non-cash compensation charges in the future if these targets are met
and the option holders terminate their employment prior to the end of the
eight-year vesting period.

                                      F-28

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                                     [LOGO]

                             OFFER TO EXCHANGE ITS
               10 3/8% SENIOR SUBORDINATED NOTES DUE 2011, WHICH
         HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, FOR ANY
     AND ALL OF ITS OUTSTANDING 10 3/8% SENIOR SUBORDINATED NOTES DUE 2011

                            ------------------------

                                   PROSPECTUS

                            ------------------------

                                 JUNE 28, 2001

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