PRIMEDEX HEALTH SYSTEMS INC
8-K, 1997-09-18
MEDICAL LABORATORIES
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               SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C.

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


                                FORM 8-K

                             CURRENT REPORT


                 Pursuant to Section 13 or 15(d) of the
                    Securities Exchange Act of 1934



   Date of Report (Date of earliest event reported) September 8, 1997



                     PRIMEDEX HEALTH SYSTEMS, INC.
         [Exact Name of Registrant as specified in its Charter]




New York                       0-19019                         13-3326724
[state or other           [Commission File No.]             [IRS Employer
jurisdiction of                                            Identification No.]
incorporation]




          1516  Cotner  Avenue,  Los  Angeles,   CA  90025-3303  [Address  of
           principal executive offices; ZIP Code]





    Registrant's Telephone No., including Area Code: (310) 478-7808



              Former address, if changed since last report
                           Page 1 of 46 Pages
                        Exhibit Index on Page 2




<PAGE>



Item 2.           Acquisition or Disposition of Assets.

            On September 8, 1997,  Registrant sold its Future Diagnostics,  Inc.
("FDI")  subsidiary to Preferred  Health  Management,  Inc., an unrelated  third
party, for $13,500,000 payable $9,761,853 cash, a two year $2,000,000 promissory
note bearing interest at 10% per annum with a $1,000,000  principal  payment due
in one year with the balance of the purchase  price  consisting of assumption of
outstanding  liabilities  connected with the subsidiary's assets. The promissory
note is secured by the subsidiary's  accounts  receivable.  FDI arranges for the
provision of diagnostic imaging services through a network of contracted imaging
centers,  which in turn provide imaging services to insurance companies,  health
plans and other health care payers.

            Registrant  retained  the  portion  of  FDI's  business  related  to
radiology management services,  and in particular physician  utilization review,
which is in keeping with  Registrant's  intent to concentrate on the development
and expansion of its core business of radiology practice management, information
management systems and utilization review/management.

  item 7.     Financial Statements,Pro Forma Financial Information and Exhibits.

   (c) Exhibits. The following exhibit is furnished with this Current Report:

            Exhibit No.                   Document
               2                          Stock Purchase Agreement whereby
                                         Registrant sold its Future Diagnostics,
Inc.                                            subsidiary

                                  SIGNATURES

      Pursuant to the  requirements  of the Securities and Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                              PRIMEDEX HEALTH SYSTEMS, INC.


Dated:  September 9, 1997     By: /s/ Howard G. Berger
                                  --------------------------------
                                  Howard G. Berger, M.D., President












<PAGE>



                           STOCK PURCHASE AGREEMENT


   THIS STOCK PURCHASE AGREEMENT is entered into as of September 3, 1997, by and
among  PREFERRED   HEALTH   MANAGEMENT,   INC.,  a  Delaware   corporation  (the
"Purchaser"), FUTURE DIAGNOSTICS, INC., a California corporation ("FDI"), RADNET
MANAGED IMAGING SERVICES, INC., a California corporation ("RadNet") and PRIMEDEX
HEALTH SYSTEMS, INC., a New York corporation  ("Primedex").  Certain capitalized
terms used in this Agreement are defined on Exhibit A.

                                   RECITALS

   A.    FDI is a wholly-owned subsidiary of RadNet, which is a wholly-owned 
subsidiary of Primedex.

   B. RadNet  wishes to sell all of the  outstanding  capital  stock of FDI (the
"Shares") to the Purchaser on the terms set forth in this Agreement.

                                   AGREEMENT

   The Purchaser, FDI, RadNet and Primedex, intending to be legally bound, agree
as follows:

SECTION 1.     SALE AND PURCHASE OF SHARES; RELATED TRANSACTIONS

   1.1 Sale and Purchase of Shares. At the Closing,  RadNet shall sell,  assign,
transfer  and  deliver  the Shares to the  Purchaser,  and the  Purchaser  shall
purchase the Shares from RadNet,  on the terms and subject to the conditions set
forth in this Agreement.

   1.2   Purchase Price.

         (a)   The aggregate purchase price payable by the Purchaser for the
 Shares (the "Purchase Price") shall be Thirteen Million Five Hundred Dollars
 ($13,500,000). The Purchase Price shall be paid by the Purchaser to RadNet as 
follows:

               (i)  Purchaser  will execute a Promissory  Note in the  principal
amount of $2,000,000  to RadNet in  substantially  the form  attached  hereto as
Exhibit B-1 (the "Note"). The Note will bear interest,  payable quarterly, at an
annual  rate of ten percent  (10%),  will be due as to  $1,000,000  on the first
anniversary of the Closing Date,  and will be due as to the remaining  principal
amount on the second anniversary of the Closing Date.

               (ii) Purchaser will assume the $898,901.40  remaining  balance of
RadNet's obligations under clauses (b)(iii),  (b)(iv) and (b)(v) of Section 2 of
the Stock Purchase Agreement dated November 14, 1995 among Primedex,  RadNet and
the shareholders of FDI.

               (iii) Through its purchase of the Shares,  Purchaser  will assume
Net Provider Site Obligations as of September 3, 1997 of $839,246.00.

               (iv) The  remaining  purchase  price of a total of  $9,761,852.60
will be payable in cash,  by wire  transfer of  immediately  available  funds to
RadNet's  designated  account,  or at  RadNet's  option  by  certified  or  bank
cashier's check.

               (v)  All of the  Purchaser's  liabilities  pursuant  to  Sections
1.2(a)(i)  and (ii) will be secured by a pledge of  accounts  receivable  of FDI
pursuant to a Security  Agreement in  substantially  the form attached hereto as
Exhibit B-2.




<PAGE>



   1.3   Closing.

         (a)  The  closing  of the  sale of the  Shares  to the  Purchaser  (the
"Closing") shall take place at the offices of Cooley Godward LLP, 3000 El Camino
Real, Palo Alto,  California  94306 at 10:00 a.m.  Pacific Time on September __,
1997 or at  such  other  place  or time  as the  Purchaser  and FDI may  jointly
designate. For purposes of this Agreement, "Closing Date" shall mean to the time
and date as of which the Closing actually takes place.

         (b) At the Closing:

               (i) RadNet shall deliver to the Purchaser the stock  certificates
representing  the Shares,  duly endorsed (or  accompanied by duly executed stock
powers); and

               (ii) Purchaser shall deliver to RadNet the Purchase Price for the
Shares.

   1.4   Post-Closing Adjustments.

         (a) After September 3, 1997, FDI shall continue to post in its books of
account (i) accounts receivable which arose at or prior to the close of business
on  September  3, 1997 but were not yet recorded in the books and records of FDI
as of the close of business on September 3, 1997 (the "Subsequent A/R") and (ii)
provider site  obligations  for PPO network  medical  services which arose at or
prior to the close of business on September 3, 1997 but were not yet recorded in
the books and records of FDI as of the close of business  on  September  3, 1997
(the  "Subsequent  A/P").  As soon as  possible  after  the  Closing,  FDI shall
calculate the aggregate amount of all compensation (including salary and wages),
vacation  pay and  sick pay (if  any)  accrued  and  unpaid  as of the  close of
business  on the Closing  Date (the  "Employee  Liabilities").  Ninety (90) days
after the  Closing  Date (or sooner if the  parties  agree in  writing  that the
records are then complete) (such date, the "Adjustment Date"), the parties shall
effect a post-closing  adjustment,  as follows.  If the amount of the Subsequent
A/R exceeds the sum of the  Subsequent  A/P and Employee  Liabilities,  then the
Purchaser  shall pay the  amount of such  excess  to  RadNet.  If the sum of the
Subsequent A/P and Employee  Liabilities exceeds the Subsequent A/R, then RadNet
will pay the amount of such excess to the Purchaser.

SECTION 2.     REPRESENTATIONS AND WARRANTIES OF FDI, RADNET AND PRIMEDEX

   Except as disclosed on the Disclosure  Schedule attached hereto as Exhibit D,
FDI, RadNet and Primedex jointly and severally  represent and warrant to and for
the benefit of the Indemnitees, as follows:

   2.1   Due Organization; No Subsidiaries; Etc.

         (a) FDI is a corporation  duly organized,  validly existing and in good
standing under the laws of the State of California  and has all necessary  power
and authority:

               (i)   to conduct its business in the manner in which its 
business is currently being conducted;

               (ii) to own and use its  assets in the manner in which its assets
are currently owned and used; and

               (iii) to perform its obligations under all FDI Contracts.


                                      2

<PAGE>



         (b) FDI has never  conducted any business under or otherwise  used, for
any purpose or in any  jurisdiction,  any fictitious  name,  assumed name, trade
name or other name, other than the name "Future Diagnostics, Inc."

         (c) FDI is not  required to be  qualified,  authorized,  registered  or
licensed to do business as a foreign  corporation in any jurisdiction other than
the jurisdictions  identified in Part 2.1 of the Disclosure Schedule and in such
other jurisdictions where the failure to be so qualified, authorized, registered
or licensed to do  business as a foreign  corporation  would not have a material
adverse effect on FDI. FDI is in good standing as a foreign  corporation in each
of the jurisdictions identified in Part 2.1 of the Disclosure Schedule.

         (d) Part 2.1 of the Disclosure  Schedule  accurately sets forth (i) the
names of the members of FDI's board of directors,  (ii) the names of the members
of each committee of FDI's board of directors, and (iii) the names and titles of
FDI's officers.

         (e)  Neither  FDI nor any of its  stockholders  has ever  approved,  or
commenced any proceeding or made any election contemplating,  the dissolution or
liquidation of FDI or the winding up or cessation of FDI's business or affairs.

         (f) FDI has no subsidiaries,  and FDI has never owned,  beneficially or
otherwise, any shares or other securities of, or any direct or indirect interest
of any nature in, any Entity.

   2.2   Articles of Incorporation and Bylaws; Records.

         (a) FDI has delivered to the Purchaser accurate and complete copies of:

               (i)   FDI's articles of incorporation and bylaws, including all 
amendments thereto;

               (ii)  the stock records of FDI; and

               (iii) the minutes  and other  records of the  meetings  and other
proceedings (including any actions taken by written consent or otherwise without
a meeting) of the  stockholders  of FDI,  the board of  directors of FDI and all
committees of the board of directors of FDI.

There  have  been  no  formal  meetings  or  other  formal  proceedings  of  the
stockholders of FDI, the board of directors of FDI or any committee of the board
of  directors  of FDI that are not  fully  reflected  in such  minutes  or other
records.

         (b) There has not been any material  violation of any of the provisions
of FDI's articles of  incorporation  or bylaws or of any  resolution  adopted by
FDI's stockholders,  FDI's board of directors or any committee of FDI's board of
directors;  and no event has occurred,  and no condition or circumstance exists,
that  might  (with or  without  notice  or lapse of time)  constitute  or result
directly or indirectly in such a violation.

         (c) The books of account, stock records, minute books and other records
of FDI are  accurate,  up-to-date  and  complete,  and have been  maintained  in
accordance with sound and prudent business practices.  All of the records of FDI
are in the  actual  possession  and direct  control of FDI.  FDI has in place an
adequate  and  appropriate  system  of  internal  controls  which is at least as
comprehensive  and  effective  as the systems of internal  controls  customarily
maintained by Comparable Entities.



                                      3

<PAGE>



   2.3   Capitalization, Etc.

         (a) The  authorized  capital  stock of FDI consists of 10,000 shares of
common  stock,  no par  value of which  2,717  shares  (constituting  all of the
Shares) have been issued and are outstanding.

         (b) RadNet has, and the Purchaser will acquire at the Closing, good and
valid title to the Shares free and clear of any Encumbrances.  All of the Shares
are held beneficially and of record by RadNet.

         (c) All of the Shares (i) have been duly authorized and validly issued,
(ii) are  fully  paid and  non-assessable,  and (iii)  have been  issued in full
compliance  with all  applicable  securities  laws and  other  applicable  Legal
Requirements.

         (d)   There is no:

               (i)  outstanding  subscription,  option,  call,  warrant or right
(whether  or not  currently  exercisable)  to acquire  any shares of the capital
stock or other securities of FDI;

               (ii)  outstanding  security,  instrument or obligation that is or
may become  convertible into or exchangeable for any shares of the capital stock
or other securities of FDI;

               (iii) Contract or understanding  under which FDI is or may become
obligated  to sell or  otherwise  issue any shares of its  capital  stock or any
other securities; or

               (iv)  condition or  circumstance  that may directly or indirectly
give rise to or  provide a basis for the  assertion  of a claim by any Person to
the effect  that such  Person is  entitled  to acquire or receive  any shares of
capital stock or other securities of FDI.

         (e) FDI has never  repurchased,  redeemed or otherwise  reacquired  any
shares of capital stock or other securities.

   2.4   Financial Statements.

         (a)  FDI  has  delivered  to  the  Purchaser  the  following  financial
statements and notes (collectively, the "FDI Financial Statements"):

               (i) the  balance  sheets of FDI as of October  31, 1995 and 1996,
and the related statements of operations of FDI for the years then ended; and

               (ii) the unaudited  balance sheet of FDI as of June 30, 1997 (the
"Unaudited  Interim Balance  Sheet"),  and the related  unaudited  statements of
operations of FDI for the six months then ended.

FDI was  audited  as of  October  31,  1996 in  conjunction  with  the  audit of
Primedex.

         (b) All of the FDI  Financial  Statements  are accurate and complete in
all  respects,  and the  dollar  amount of each line  item  included  in the FDI
Financial  Statements is accurate in all respects.  The FDI Financial Statements
present fairly the financial  position of FDI as of the respective dates thereof
and the results of operations of FDI for the periods  covered  thereby.  The FDI
Financial  Statements have been prepared in accordance  with generally  accepted
accounting  principles,  applied on a consistent  basis  throughout  the periods
covered.


                                      4

<PAGE>



   2.5  Absence of  Changes.  Except as set forth in Part 2.5 of the  Disclosure
Schedule, since June 30, 1997:

         (a) there has not been any adverse change in FDI's business, condition,
assets, liabilities,  operations, financial performance, net income or prospects
(or in any aspect or portion thereof), and no event has occurred that might have
an adverse effect on FDI's business, condition, assets, liabilities, operations,
financial  performance,  net  income or  prospects  (or on any aspect or portion
thereof);

         (b)  there  has not been any loss,  damage  or  destruction  to, or any
interruption  in the use of,  any of FDI's  assets  (whether  or not  covered by
insurance);

         (c) FDI has not (i) declared,  accrued,  set aside or paid any dividend
or made any other  distribution  in respect of any shares of capital  stock,  or
(ii) repurchased,  redeemed or otherwise  reacquired any shares of capital stock
or other securities;

         (d) FDI has not sold or otherwise issued any shares of capital stock or
any other securities;

         (e) FDI has not amended its articles of incorporation or bylaws and has
not effected or been a party to any Acquisition  Transaction,  recapitalization,
reclassification  of  shares,  stock  split,  reverse  stock  split  or  similar
transaction;

         (f) FDI has not  purchased  or  otherwise  acquired  any asset from any
other  Person,  except for supplies  acquired by FDI in the  Ordinary  Course of
Business;

         (g) FDI has not leased or licensed any asset from any other Person;

         (h)   FDI has not made any capital expenditure;

         (i) FDI has not sold or  otherwise  transferred,  and has not leased or
licensed, any asset to any other Person except for products sold by FDI from its
inventory in the Ordinary Course of Business;

         (j)  FDI has not  written  off as  uncollectible,  or  established  any
extraordinary   reserve  with  respect  to,  any  account  receivable  or  other
indebtedness;

         (k) FDI has not pledged or hypothecated  any of its assets or otherwise
permitted any of its assets to become subject to any Encumbrance;

         (l) FDI has not made any loan or advance to any other Person;

         (m) FDI has not (i)  established or adopted any Employee  Benefit Plan,
or (ii) paid any bonus or made any  profit-sharing  or  similar  payment  to, or
increased the amount of the wages, salary, commissions, fringe benefits or other
compensation  or  remuneration  payable  to, any of its  directors,  officers or
employees;

         (n) FDI has not  entered  into,  and  neither FDI nor any of the assets
owned or used by FDI has become bound by, any  Contract  that is not an Excluded
Contract;

         (o) other than in the Ordinary Course,  no Contract by which FDI or any
of the assets  owned or used by FDI is or was bound,  or under  which FDI has or
had any rights or interest, has been amended or terminated;


                                      5

<PAGE>



         (p) FDI has not incurred,  assumed or otherwise  become  subject to any
Liability,  other than accounts payable (of the type required to be reflected as
current  liabilities in the "liabilities"  column of a balance sheet prepared in
accordance with GAAP) incurred by FDI in the Ordinary Course of Business;

         (q) FDI has not  discharged  any  Encumbrance or discharged or paid any
indebtedness  or other  Liability,  except  for  accounts  payable  that (i) are
reflected as current  liabilities in the  "liabilities"  column of the Unaudited
Interim  Balance  Sheet or have been  incurred by FDI since June 30, 1997 in the
Ordinary  Course  of  Business,  and (ii) have  been  discharged  or paid in the
Ordinary Course of Business;

         (r) FDI has not forgiven  any debt or otherwise  released or waived any
right or claim  other than in the  Ordinary  Course and in any case not  greater
than an aggregate of $25,000 in any one month period;

         (s) FDI has not changed any of its methods of  accounting or accounting
practices in any respect;

         (t) FDI has not entered into any  transaction or taken any other action
outside the Ordinary Course of Business; and

         (u) FDI has not agreed, committed or offered (in writing or otherwise),
and has not attempted,  to take any of the actions  referred to in clauses "(c)"
through "(t)" above.

   2.6   Title to Assets.

         (a) FDI owns, and has good and valid title to, all assets  purported to
be owned by it, including:

               (i)   all assets reflected on the Unaudited Interim Balance Sheet
                  
               (ii) all assets acquired by FDI since June 30, 1997;

               (iii) all assets  referred  to in Parts 2.8,  2.9 and 2.11 of the
Disclosure Schedule and all of FDI's rights under FDI Contracts; and

               (iv)  all other assets reflected in FDI's books and records as
 being owned by FDI.

Except as set forth in Part 2.6 of the Disclosure  Schedule,  all of said assets
are owned by FDI free and clear of any Encumbrances.

         (b) Part 2.6 of the Disclosure  Schedule identifies all assets that are
being leased or licensed to FDI.

   2.7 Bank Accounts. Part 2.7 of the Disclosure Schedule accurately sets forth,
with respect to each account maintained by or for the benefit of FDI at any bank
or other financial institution:

         (a)   the name and location of the institution at which such account is
 maintained;

         (b) the name in which such account is maintained and the account number
of such account;

         (c) a  description  of such  account  and the  purpose  for which  such
account is used;

                                      6

<PAGE>



         (d)   the current balance in such account;

         (e) the rate of interest being earned on the funds in such account,  if
any; and

         (f)  the  names  of all  individuals  authorized  to  draw  on or  make
withdrawals from such account.

There are no safe deposit boxes or similar arrangements maintained by or for the
benefit of FDI.

   2.8   Receivables; Major Customers.

         (a)  Part 2.8 of the  Disclosure  Schedule  provides  an  accurate  and
complete  breakdown and aging of all accounts  receivable of FDI as of September
3, 1997.

         (b)  Except as set forth in Part 2.8 of the  Disclosure  Schedule,  all
existing  accounts  receivable  of  FDI  (including  those  accounts  receivable
reflected  on the  Unaudited  Interim  Balance  Sheet  that  have  not yet  been
collected and those accounts receivable that have arisen since June 30, 1997 and
have not yet been collected):

               (i) represent valid  obligations of customers of FDI arising from
bona fide transactions entered into in the Ordinary Course of Business; and

               (ii) are current and no less than 95% of which will be  collected
on or before six months from the Closing Date.

         (c) Part 2.8 of the  Disclosure  Schedule  accurately  identifies,  and
provides an accurate and complete  breakdown of the revenues received from, each
customer or other  Person  contributing  materially  to the business of FDI that
accounted for (i) more than  $1,000,000 of FDI's gross revenues in 1996, or (ii)
more than  $500,000 of FDI's gross  revenues in the first half of 1997.  FDI has
not received any notice or other  communication  (in writing or otherwise),  and
has not received any other  information,  indicating  that any customer or other
Person identified in Part 2.8 of the Disclosure  Schedule may cease dealing with
FDI or may otherwise materially reduce the volume of business transacted by such
Person with FDI below historical levels.

   2.9   Equipment, Etc.

         (a) Part  2.9 of the  Disclosure  Schedule  accurately  identifies  all
equipment,  furniture,  fixtures,  improvements and other tangible assets (other
than inventory and the Excluded  Assets) owned by FDI, and accurately sets forth
the date of  acquisition,  original  cost and book value of each of said assets.
Part 2.9 also accurately identifies all tangible assets leased to FDI.

         (b) Each asset  identified  or required to be identified in Part 2.9 of
the Disclosure Schedule:

               (i) is structurally  sound,  free of defects and deficiencies and
in good condition and repair (ordinary wear and tear excepted);

               (ii)  complies in all respects  with,  and is being  operated and
otherwise used in full compliance with, all applicable Legal Requirements; and

               (iii) is adequate for the uses to which it is being put.

The assets identified in Part 2.9 together with the Licensed Assets set forth in
Part 2.6 of the  Disclosure  Schedule  are  adequate  for the  conduct  of FDI's
business in the manner in which such

                                      7

<PAGE>



business is currently being conducted.  The Retained Business (as defined in the
Noncompetition and Nondisclosure Agreement of even date herewith among Primedex,
RadNet,  FDI and the  Purchaser) is not necessary  for the  continuation  of the
business of FDI as currently conducted other than the Retained Business.

   2.10 Real  Property.  FDI does not own any real  property or any  interest in
real property,  except for the leaseholds created under the real property leases
identified in Part 2.12 of the Disclosure Schedule.  Part 2.10 of the Disclosure
Schedule  provides an accurate and complete  description of the premises covered
by said leases and the facilities located on such premises.  FDI enjoys peaceful
and undisturbed possession of such premises.

   2.11  Proprietary Assets.

         (a) Except as set forth in Part 2.11 of the Disclosure Schedule,  there
is no Proprietary Asset that is owned by or licensed to FDI or that is otherwise
used or useful in connection with FDI's business.

         (b) FDI has taken all measures and precautions necessary to protect the
confidentiality and value of each Proprietary Asset identified or required to be
identified in Part 2.11 of the Disclosure Schedule.

         (c)  FDI is not  infringing,  and  has  not at any  time  infringed  or
received  any notice or other  communication  (in writing or  otherwise)  of any
actual,  alleged,  possible or potential  infringement of, any Proprietary Asset
owned or used by any other Person.  To the best  Knowledge of FDI and the Parent
Companies, no other Person is infringing, and no Proprietary Asset owned or used
by any other Person infringes or conflicts with, any Proprietary  Asset owned or
used by FDI.

         (d) The  Proprietary  Assets  identified in Part 2.12 of the Disclosure
Schedule  constitute all of the  Proprietary  Assets  necessary to enable FDI to
conduct its  business in the manner in which its  business  is  currently  being
conducted.

   2.12  Contracts.

         (a) Part 2.12 of the Disclosure  Schedule identifies each FDI Contract,
except for any Excluded  Contract.  FDI has delivered to the Purchaser  accurate
and  complete  copies  of all  FDI  Contracts  identified  in  Part  2.12 of the
Disclosure Schedule, including all amendments thereto.

         (b) Each FDI  Contract  is valid and in full force and  effect,  and is
enforceable by FDI in accordance with its terms.  No Contract  contains any term
or  provision  that  is not  customarily  found  in  Contracts  entered  into by
Comparable Entities.

         (c) Except as set forth in Part 2.12 of the Disclosure Schedule:

               (i) no Person has violated or materially breached, or declared or
committed any default under, any FDI Contract;

               (ii) no event has  occurred,  and no  circumstance  or  condition
exists,  that might  (with or  without  notice or lapse of time) (A) result in a
violation or material  breach of any of the provisions of any FDI Contract,  (B)
give any Person the right to declare a default or exercise  any remedy under any
FDI  Contract,  (C) give any  Person the right to  accelerate  the  maturity  or
performance  of any FDI  Contract,  or (D) give any  Person the right to cancel,
terminate or modify any FDI Contract;


                                      8

<PAGE>



               (iii)  none of the  Companies  has  received  any notice or other
communication (in writing or otherwise) regarding any actual, alleged,  possible
or potential violation or breach of, or default under, any FDI Contract; and

               (iv) FDI has not waived any of its rights under any FDI Contract.

         (d) To the best Knowledge of FDI and the Parent Companies,  each Person
against  which FDI has or may acquire any rights  under any FDI Contract is able
to satisfy all of such Person's obligations pursuant to said FDI Contract.

         (e) Except as set forth in Part 2.12 of the Disclosure Schedule:

               (i) FDI is not a guarantor and has not otherwise agreed to cause,
insure or become liable for, and none of FDI's assets are pledged to secure, the
performance or payment of any obligation or other Liability of any other Person;
and

               (ii)  FDI  is not a  party  to or  bound  by  any  joint  venture
agreement,   partnership  agreement,   profit-sharing  agreement,   cost-sharing
agreement, loss-sharing agreement or similar Contract.

         (f) The  performance  of the  FDI  Contracts  will  not  result  in any
violation of or failure to comply with any Legal Requirement.

         (g) No Person is  renegotiating,  or has the right to renegotiate,  any
amount  paid or  payable  to FDI under  any FDI  Contract  or any other  term or
provision of any FDI Contract.

         (h) The Contracts  identified in Part 2.12 of the  Disclosure  Schedule
and  the  Excluded  Contracts  collectively  constitute  all  of  the  Contracts
necessary  to enable  FDI to  conduct  its  business  in the manner in which its
business is currently being conducted.

   2.13  Liabilities; Major Suppliers.

         (a)   FDI has no Liabilities, except for:

               (i)   liabilities identified as such in the "liabilities" column 
of the Unaudited Interim Balance Sheet;

               (ii)  accounts  payable (of the type  required to be reflected as
current  liabilities in the "liabilities"  column of a balance sheet prepared in
accordance  with GAAP) incurred by FDI in the Ordinary  Course of Business since
June 30, 1997;

               (iii) FDI's  obligations  under the Contracts listed in Part 2.12
or the  Licensed  Assets  listed under Part 2.6 of the  Disclosure  Schedule and
under Excluded  Contracts,  to the extent that the existence of such obligations
is ascertainable solely by reference to such Contracts;

               (iv)  Insurance company overpayments in an amount not to exceed
 $25,000; and

               (v)  Physician  payables  due after  cash is  received  by FDI on
accounts receivable which is not in excess of $500,000.

         (b) Part 2.13 of the Disclosure Schedule:


                                      9

<PAGE>



               (i)  provides an accurate  and  complete  breakdown  and aging of
FDI's accounts payable as of September 3, 1997;

               (ii)  provides  an  accurate  and  complete  breakdown  of  FDI's
long-term debt as of the date of this Agreement.

         (c) FDI has not paid, and FDI is not and will not become liable for the
payment  of, any fees,  costs or  expenses  of the type  referred  to in Section
11.3(a).

         (d) Part 2.13 of the Disclosure  Schedule  accurately  identifies,  and
provides  an  accurate  and  complete  breakdown  of the  amounts  paid to, each
supplier or other Person that  received (i) more than  $500,000 from FDI in 1996
and the six months ended June 30, 1997,  or (ii) more than  $250,000 from FDI in
the first half of 1997.

   2.14  Compliance with Legal Requirements.

         (a)   Except as set forth in Part 2.14 of the Disclosure Schedule:

               (i) FDI is in  compliance  with each  Legal  Requirement  that is
material to the conduct of its  business or the  ownership  or use of any of its
assets;

               (ii) to the best  Knowledge of FDI and the Parent  Companies,  no
event has occurred, and no condition or circumstance exists, that might (with or
without notice or lapse of time)  constitute or result directly or indirectly in
a violation by FDI of, or a failure on the part of FDI to comply with, any Legal
Requirement; and

               (iii) none of the Companies has received, at any time, any notice
or other  communication  (in writing or otherwise) from any Governmental Body or
any other  Person  regarding  (i) any actual,  alleged,  possible  or  potential
violation of, or failure to comply with,  any Legal  Requirement  on the part of
FDI or with respect to FDI's  business or assets,  or (ii) any actual,  alleged,
possible  or  potential  obligation  on the  part  of any  of the  Companies  to
undertake,  or to bear all or any  portion  of the cost of,  any  cleanup or any
remedial, corrective or response action of any nature on the part of FDI or with
respect to FDI's business or assets.

         (b) FDI has delivered to the Purchaser an accurate and complete copy of
each  report,  study,  survey or other  document  to which FDI has  access  that
addresses or otherwise  relates to the compliance with, or the  applicability to
any of the  Companies  of,  any  Legal  Requirement  on the  part of FDI or with
respect to FDI's business or assets.

         (c) To  the  best  Knowledge  of  FDI  and  the  Parent  Companies,  no
Governmental Body in a political subdivision in which FDI currently conducts its
business has proposed or is considering any Legal  Requirement  that, if adopted
or otherwise put into effect,  (i) may have a material  adverse  effect on FDI's
business, condition, assets, liabilities, operations, financial performance, net
income or prospects  or on the ability of FDI or the Parent  Companies to comply
with or  perform  any  covenant  or  obligation  under any of the  Transactional
Agreements, or (ii) may have the effect of preventing,  delaying, making illegal
or otherwise materially interfering with any of the Transactions.

   2.15  Governmental Authorizations.

         (a)   Part 2.15 of the Disclosure Schedule identifies:

               (i)   each Governmental Authorization that is held by FDI; and


                                      10

<PAGE>



               (ii) each  other  Governmental  Authorization  that,  to the best
Knowledge of FDI and the Parent Companies, is held by any of FDI's employees and
relates to or is useful in connection with FDI's business.

FDI has  delivered to the Purchaser  accurate and complete  copies of all of the
Governmental  Authorizations identified in Part 2.15 of the Disclosure Schedule,
including all renewals  thereof and all amendments  thereto.  Each  Governmental
Authorization  identified  or  required  to be  identified  in Part  2.15 of the
Disclosure Schedule is valid and in full force and effect.

         (b) Except as set forth in Part 2.15 of the Disclosure Schedule:

               (i) FDI and its  employees  are,  and  the  Companies  and  their
respective  employees have at all times been, in full compliance with all of the
terms and requirements of each Governmental Authorization identified or required
to be identified in Part 2.15 of the Disclosure Schedule;

               (ii) no event has  occurred,  and no  condition  or  circumstance
exists,  that might (with or without  notice or lapse of time) (A) constitute or
result  directly or indirectly in a violation of or a failure to comply with any
term or requirement of any Governmental  Authorization identified or required to
be identified in Part 2.15 of the Disclosure Schedule, or (B) result directly or
indirectly in the revocation, withdrawal, suspension, cancellation,  termination
or modification of any Governmental  Authorization  identified or required to be
identified in Part 2.15 of the Disclosure Schedule;

               (iii) none of the Companies has ever  received,  and, to the best
Knowledge of FDI and the Parent  Companies,  no employee of any of the Companies
has ever received,  any notice or other  communication (in writing or otherwise)
from  any  Governmental  Body or any  other  Person  regarding  (A) any  actual,
alleged,  possible or potential  violation of or failure to comply with any term
or requirement of any Governmental  Authorization on the part of FDI or relating
to its business or assets,  or (B) any actual,  proposed,  possible or potential
revocation, withdrawal, suspension, cancellation, termination or modification of
any Governmental Authorization on the part of FDI or relating to its business or
assets; and

               (iv) all applications required to have been filed for the renewal
of the Governmental Authorizations required to be identified in Part 2.15 of the
Disclosure  Schedule have been duly filed on a timely basis with the appropriate
Governmental Bodies, and each other notice or filing required to have been given
or made with respect to such Governmental  Authorizations has been duly given or
made on a timely basis with the appropriate Governmental Body.

         (c) The  Governmental  Authorizations  identified  in Part  2.15 of the
Disclosure Schedule constitute all of the Governmental  Authorizations necessary
(i) to enable FDI to conduct its business in the manner in which its business is
currently being  conducted,  and (ii) to permit FDI to own and use its assets in
the manner in which they are currently owned and used.

   2.16  Tax Matters.

         (a) Each Tax required to have been paid, or claimed by any Governmental
Body to be payable, by FDI (whether pursuant to any Tax Return or otherwise) has
been  duly  paid in full or on a timely  basis.  Any Tax  required  to have been
withheld or collected by FDI has been duly withheld and  collected;  and (to the
extent  required)  each such Tax has been paid to the  appropriate  Governmental
Body.

         (b) Part 2.16 of the Disclosure Schedule accurately  identifies all Tax
Returns required to be filed by or on behalf of FDI with any  Governmental  Body
with respect to any taxable period

                                      11

<PAGE>



ending on or before the Closing Date ("FDI  Returns").  All FDI Returns (i) have
been or, if required to be filed prior to the Closing  Date,  will be filed when
due,  and (ii) have been,  if required  to be filed  prior to the Closing  Date,
filed, accurately and completely prepared in full compliance with all applicable
Legal Requirements.  All amounts shown on the FDI Returns to be due on or before
the Closing Date, and all amounts  otherwise  payable in connection with the FDI
Returns on or before the  Closing  Date,  have been or will be paid on or before
the Closing  Date.  FDI has  delivered  to the  Purchaser  accurate and complete
copies of all FDI Returns filed since December 31, 1992.

         (c) The FDI Financial Statements fully accrue all actual and contingent
liabilities  for Taxes with respect to all periods  through the dates thereof in
accordance with GAAP (subject to consolidation with parent entities).

         (d)  Except as set forth in Part 2.16 of the  Disclosure  Schedule,  no
claim or other  Proceeding  is  pending or has been  threatened  against or with
respect to FDI in respect of any Tax. There are no unsatisfied  Liabilities  for
Taxes  (including  liabilities  for  interest,  additions  to tax and  penalties
thereon  and  related  expenses)  with  respect to any notice of  deficiency  or
similar document  received by any of the Companies.  FDI has not entered into or
has become bound by any agreement or consent  pursuant to Section  341(f) of the
Code.  FDI will not be required to include any  adjustment in taxable income for
any tax period (or portion thereof)  pursuant to Section 481 or 263A of the Code
or any  comparable  provision  under  state or  foreign  Tax laws as a result of
transactions or events occurring,  or accounting methods employed,  prior to the
Closing.

         (e) There is no agreement, plan, arrangement or other Contract covering
any  employee  or  independent  contractor  or former  employee  or  independent
contractor of FDI that,  individually or collectively,  could give rise directly
or indirectly to the payment of any amount that would not be deductible pursuant
to Section  280G or Section  162 of the Code.  FDI is not a party to or bound by
any tax indemnity agreement,  tax sharing agreement, tax allocation agreement or
similar Contract.

   2.17  Employee and Labor Matters.

         (a) Part 2.17 of the Disclosure  Schedule  accurately sets forth,  with
respect to each employee of FDI (including any employee of FDI who is on a leave
of absence or on layoff status):

               (i) the  name of such  employee  and the  date as of  which  such
employee was originally hired by FDI or one of the Parent Companies;

               (ii)  such employee's title; and

               (iii) such employee's  annualized  compensation as of the date of
this Agreement.

         (b) FDI is not a party to or bound by any  employment  agreement or any
union contract,  collective bargaining agreement or similar Contract,  except as
set forth in Part 2.17 of the Disclosure Schedule.

         (c) The  employment of each of FDI's  employees is terminable by FDI at
will.  FDI has  delivered to the Purchaser  accurate and complete  copies of all
employee  manuals and handbooks,  disclosure  materials,  policy  statements and
other materials  relating to the employment of the current and former  employees
of each of the Companies.

         (d) To the best Knowledge of FDI and the Parent Companies:

               (i)   no employee of FDI intends to terminate his employment with
                       FDI;


                                      12

<PAGE>



               (ii) no employee of FDI has  received an offer to join a business
that may be competitive with FDI's business; and

               (iii)  no  employee  of  FDI is a  party  to or is  bound  by any
confidentiality agreement,  noncompetition agreement or other Contract (with any
Person) that may have an adverse effect on (A) the  performance by such employee
of any of his duties or  responsibilities  as an  employee  of FDI, or (B) FDI's
business or operations.

         (e) FDI is not engaged in any unfair  labor  practice.  There has never
been any slowdown, work stoppage, labor dispute or union organizing activity, or
any similar activity or dispute, affecting FDI or any of its employees. There is
not now pending,  and no Person has  threatened to commence,  any such slowdown,
work  stoppage,  labor  dispute  or union  organizing  activity  or any  similar
activity or dispute.

   2.18  Benefit Plans; ERISA.

         (a) Part 2.18 of the  Disclosure  Schedule  identifies  and provides an
accurate and  complete  description  of each Current  Benefit Plan and each Past
Benefit Plan in which the  employees of FDI currently  have rights.  FDI has not
established,  adopted, maintained,  sponsored, contributed to or participated in
any Employee Benefit Plan,  except for the Company Plans identified in Part 2.18
of the  Disclosure  Schedule.  FDI has not provided or made available any fringe
benefit or other  benefit of any nature to any of its  employees,  except as set
forth in Part 2.18 of the Disclosure Schedule. Except as identified in Part 2.18
of the  Disclosure  Schedule,  FDI has incurred no Liability with respect to any
Company Benefit Plan. FDI shall have no Liability  arising out of this Agreement
with respect to any Company  Benefit Plan;  and, in particular,  Primedex (or an
affiliate designated by Primedex) agrees to assume any liabilities arising under
COBRA (Code ss.4980B) with respect to FDI employees who do not remain  employees
of FDI subsequent to the Closing and who cease  participating in Company Benefit
Plans that are group health plans.  FDI shall have no liability  with respect to
any Company Benefit Plan after the Closing Date.

         (b) No Company Plan identified in Part 2.18 of the Disclosure Schedule:

               (i) shall  benefit  any FDI  employees  after the  Closing  Date,
except  as may be  required  by law with the  respect  to  benefits  for  former
employees; or

               (ii) is or was a  "multiemployer  plan"  as  defined  in  Section
4001(a)(3) of ERISA.

         (c) FDI has  delivered to the  Purchaser,  with respect to each Company
Plan identified in Part 2.18 of the Disclosure Schedule:

               (i) an accurate  and  complete  copy of such Company Plan and all
amendments  thereto (including any amendment that is scheduled to take effect in
the future);

               (ii) an accurate and complete  copy of each  Contract  (including
any trust agreement,  funding agreement,  service provider agreement,  insurance
agreement,  investment management agreement or recordkeeping agreement) relating
to such Company Plan;

               (iii) an accurate and complete copy of any description,  summary,
notification,  report or other  document that has been furnished to any employee
of any of the Companies with respect to such Company Plan;


                                      13

<PAGE>



               (iv)  an  accurate  and  complete  copy  of  any  form,   report,
registration  statement or other  document that has been filed with or submitted
to any Governmental Body with respect to such Company Plan; and

               (v) an accurate and complete  copy of any  determination  letter,
notice or other  document  that has been issued by, or that has been received by
any of the Companies  from, any  Governmental  Body with respect to such Company
Plan.

         (d) No  inaccurate  or  misleading  representation,  statement or other
communication has been made or directed (in writing or otherwise) to any current
or former  FDI  employee  (i) with  respect  to such  employee's  participation,
eligibility for benefits, vesting, benefit accrual or coverage under any Company
Plan or with respect to any other matter  relating to any Company  Plan, or (ii)
with respect to any proposal or intention on the part of any of the Companies to
establish or sponsor any Employee  Benefit Plan or to provide or make  available
any fringe benefit or other benefit of any nature.

         (e) Except as set forth in Part 2.18 of the  Disclosure  Schedule,  FDI
has not advised any of its employees  (in writing or otherwise)  that it intends
or expects to establish  or sponsor any  Employee  Benefit Plan or to provide or
make available any fringe benefit or other benefit of any nature in the future.

   2.19  Environmental Matters.

         (a) FDI is not liable or  potentially  liable for any response  cost or
natural  resource  damages  under Section  107(a) of CERCLA,  or under any other
so-called  "superfund" or "superlien"  law or similar Legal  Requirement,  at or
with respect to any site.

         (b) FDI has  never  received  any  notice  or other  communication  (in
writing or otherwise) from any  Governmental  Body or other Person regarding any
actual, alleged, possible or potential Liability arising from or relating to the
presence, generation, manufacture, production, transportation, importation, use,
treatment,  refinement,   processing,  handling,  storage,  discharge,  release,
emission or disposal of any Hazardous Material.  No Person has ever commenced or
threatened to commence any contribution  action or other Proceeding  against FDI
in connection with any such actual,  alleged,  possible or potential  Liability;
and no event has occurred,  and no condition or  circumstance  exists,  that may
directly or indirectly  give rise to, or result in FDI becoming  subject to, any
such Liability.

         (c) Except as set forth in Part 2.19 of the  Disclosure  Schedule,  FDI
has  never  generated,  manufactured,  produced,  transported,  imported,  used,
treated, refined, processed,  handled, stored, discharged,  released or disposed
of any Hazardous Material (whether lawfully or unlawfully).  Except as set forth
in Part 2.19 of the Disclosure  Schedule,  FDI has never permitted (knowingly or
otherwise) any Hazardous Material to be generated, manufactured, produced, used,
treated, refined, processed,  handled, stored, discharged,  released or disposed
of (whether lawfully or unlawfully):

               (i) on or beneath  the surface of any real  property  that is, or
that has at any time been, owned by, leased to,  controlled by or used by any of
the Companies;

               (ii) in or  into  any  surface  water,  groundwater,  soil or air
associated with or adjacent to any such real property; or

               (iii) in or into any well, pit, pond, lagoon, impoundment, ditch,
landfill, building, structure, facility, improvement,  installation,  equipment,
pipe,  pipeline,  vehicle  or  storage  container  that is or was  located on or
beneath the surface of any such real property or that is or has at any time been
owned by, leased to, controlled by or used by any of the Companies.

                                      14

<PAGE>



   2.20  Insurance.

         (a) Part 2.20 of the Disclosure  Schedule  accurately sets forth,  with
respect to each insurance policy  maintained by or at the expense of, or for the
direct or indirect benefit of, FDI:

               (i) the name of the insurance carrier that issued such policy and
the policy number of such policy;

               (ii) whether such policy is a "claims  made" or an  "occurrences"
policy;

               (iii) a description  of the coverage  provided by such policy and
the material  terms and  provisions  of such policy  (including  all  applicable
coverage  limits,  deductible  amounts  and  co-insurance  arrangements  and any
non-customary exclusions from coverage);

               (iv) the annual premium payable with respect to such policy,  and
the cash value (if any) of such policy; and

               (v) a description of any claims pending, and any claims that have
been asserted in the past, with respect to such policy.

Part 2.20 also  identifies (1) each pending  application  for insurance that has
been  submitted  by  or on  behalf  of  FDI,  and  (2)  each  self-insurance  or
risk-sharing  arrangement  affecting FDI or any of its assets. FDI has delivered
to the Purchaser  accurate and complete copies of all of the insurance  policies
identified  in Part 2.20 of the  Disclosure  Schedule  (including  all  renewals
thereof and endorsements thereto) and all of the pending applications identified
in Part  2.20 of the  Disclosure  Schedule.  Purchaser  acknowledges  that  such
policies  will  not  be  transferred   to  Purchaser  in  connection   with  the
Transactions.

         (b) Each of the  policies  identified  in Part  2.20 of the  Disclosure
Schedule  is  valid,  enforceable  and in  full  force  and  effect.  All of the
information  contained in the  applications  submitted in  connection  with said
policies  was (at the times  said  applications  were  submitted)  accurate  and
complete, and all premiums and other amounts owing with respect to said policies
have been paid in full on a timely basis.  The nature,  scope and dollar amounts
of the insurance coverage provided by said policies are sufficient to adequately
insure FDI's business, assets, operations, key employees, services and potential
liabilities;  and said insurance  coverage is at least as  comprehensive  as the
insurance coverage customarily maintained by Comparable Entities.

         (c) Except as set forth in Part 2.20 of the Disclosure Schedule,  there
is no pending  claim under or based upon any of the policies  identified in Part
2.20 of the Disclosure Schedule;  and no event has occurred, and no condition or
circumstance  exists,  that  might  (with or  without  notice  or lapse of time)
directly or indirectly give rise to or serve as a basis for any such claim.

         (d) None of the Companies has received:

               (i) any notice or other  communication  (in writing or otherwise)
regarding  the actual or possible  cancellation  or  invalidation  of any of the
policies  identified  in Part 2.20 of the  Disclosure  Schedule or regarding any
actual or possible adjustment in the amount of the premiums payable with respect
to any of said policies;

               (ii) any notice or other  communication (in writing or otherwise)
regarding  any actual or possible  refusal of coverage  under,  or any actual or
possible  rejection of any claim under,  any of the policies  identified in Part
2.20 of the Disclosure Schedule; or


                                      15

<PAGE>



               (iii)  any  Knowledge  that  the  issuer  of any of the  policies
identified in Part 2.20 of the Disclosure Schedule may be unwilling or unable to
perform any of its obligations thereunder.

   2.21  Related Party Transactions.  Except as set forth in Part 2.21 of the
      Disclosure Schedule:

         (a) no Related  Party has,  and no Related  Party has at any time since
FDI's inception,  had any direct or indirect interest of any nature in any asset
used in or otherwise relating to the business of FDI;

         (b) no Related Party is, or has at any time since FDI's inception been,
indebted to FDI;

         (c) since FDI's  inception,  no Related  Party has entered into, or has
had any direct or indirect financial  interest in, any Contract,  transaction or
business dealing of any nature involving FDI;

         (d) no  Related  Party is  competing,  or has at any time  since  FDI's
inception competed, directly or indirectly, with FDI in any market served by any
of the Companies;

         (e) no Related Party has any claim or right against FDI; and

         (f) no event has  occurred,  and no condition or  circumstance  exists,
that might (with or without notice or lapse of time) directly or indirectly give
rise to or serve as a basis for any claim or right in favor of any Related Party
against FDI.

   2.22  Certain  Payments,  Etc.  Neither  FDI nor any  officer or, to the best
Knowledge  of FDI and the  Parent  Companies,  employee,  agent or other  Person
associated with or acting for or on behalf of FDI, has at any time,  directly or
indirectly:

         (a)  used  any  corporate  funds  (i) to make  any  unlawful  political
contribution or gift or for any other unlawful purpose relating to any political
activity,  (ii) to make any  unlawful  payment to any  governmental  official or
employee,  or (iii) to establish or maintain any unlawful or unrecorded  fund or
account of any nature;

         (b) made any  false or  fictitious  entry,  or failed to make any entry
that should have been made,  in any of the books of account or other  records of
any of the Companies; or

         (c) made any payoff,  influence  payment,  bribe,  rebate,  kickback or
unlawful payment to any Person.

   2.23  Proceedings; Orders.

         (a) Except as set forth in Part 2.23 of the Disclosure Schedule,  there
is no pending  Proceeding as to which any of the Companies has received  written
notice, and, to the Companies'  knowledge,  no Person has threatened to commence
any Proceeding:

               (i)  that  involves  FDI or that  otherwise  relates  to or might
affect FDI's  business or any of the assets owned or used by FDI (whether or not
FDI is named as a party thereto); or

               (ii) that challenges,  or that may have the effect of preventing,
delaying, making illegal or otherwise interfering with, any of the Transactions.

Except  as set  forth in Part  2.23 of the  Disclosure  Schedule,  no event  has
occurred,  and no claim, dispute or other condition or circumstance exists, that
might  directly  or  indirectly  give  rise  to or  serve  as a  basis  for  the
commencement of any such Proceeding.


                                      16

<PAGE>



         (b)  Except as set forth in Part 2.23 of the  Disclosure  Schedule,  no
Proceeding  by or  against  FDI  is  outstanding;  and no  Proceeding  otherwise
involving or relating to FDI is  outstanding  or, to the  Companies'  knowledge,
threatened.

         (c) FDI has delivered to the Purchaser  accurate and complete copies of
all  pleadings,  correspondence  and other  written  materials  to which FDI has
access that relate to the Proceedings  identified in Part 2.23 of the Disclosure
Schedule.

         (d) There is no Order to which FDI, or any of the assets  owned or used
by FDI, is subject which  interferes  with its business as presently  conducted;
and none of the Companies is subject to any known Order that materially  relates
to FDI's business or to any of the assets owned or used by FDI which  interferes
with its business as presently conducted.

         (e) To the best Knowledge of FDI and the Parent  Companies,  no officer
or  employee  of FDI is  subject  to any Order that  prohibits  such  officer or
employee  from  engaging  in or  continuing  any  conduct,  activity or practice
relating to FDI's business.

         (f) To the best Knowledge of FDI and the Parent Companies,  there is no
proposed  Order that,  if issued or otherwise  put into effect,  (i) may have an
adverse effect on FDI's business,  condition,  assets, liabilities,  operations,
financial  performance,  net  income or  prospects  (or on any aspect or portion
thereof)  or on the  ability of FDI or the Parent  Companies  to comply  with or
perform any covenant or obligation under any of the Transactional Agreements, or
(ii) may have the effect of  preventing,  delaying,  making illegal or otherwise
interfering with any of the Transactions.

   2.24  Authority; Binding Nature of Agreements.

         (a) FDI has the absolute and unrestricted right, power and authority to
enter  into  and to  perform  its  obligations  under  this  Agreement;  and the
execution,  delivery and  performance  by FDI of this  Agreement  have been duly
authorized by all necessary action on the part of FDI and its stockholder, board
of directors and  officers.  This  Agreement  constitutes  the legal,  valid and
binding obligation of FDI, enforceable against FDI in accordance with its terms,
except,  in  each  case,  to  the  extent  limited  by  bankruptcy,  insolvency,
reorganization and other laws affecting  creditors'  generally,  and except that
the remedy of specific performance or similar equitable relief is available only
at the discretion of the court before which  enforcement is sought and except as
rights to indemnification may be limited by applicable law.

         (b) RadNet and Primedex have the absolute and unrestricted right, power
and capacity to enter into and to perform  their  respective  obligations  under
each of the  Transactional  Agreements  to which  RadNet and  Primedex is or may
become  a party.  This  Agreement  constitutes  the  legal,  valid  and  binding
obligation of RadNet and Primedex,  enforceable  against  RadNet and Primedex in
accordance  with its  terms,  except,  in each case,  to the  extent  limited by
bankruptcy,  insolvency,  reorganization  and other  laws  affecting  creditors'
generally,  and  except  that the  remedy of  specific  performance  or  similar
equitable  relief is available  only at the discretion of the court before which
enforcement is sought and except as rights to indemnification  may be limited by
applicable law. Upon the execution of each of the other Transactional Agreements
at the Closing, each of such other Transactional  Agreements will constitute the
legal,  valid and  binding  obligation  of RadNet and  Primedex  who are parties
thereto,  and will be enforceable against RadNet and Primedex in accordance with
its  terms,  except,  in  each  case,  to  the  extent  limited  by  bankruptcy,
insolvency,  reorganization and other laws affecting creditors'  generally,  and
except that the remedy of specific  performance or similar  equitable  relief is
available only at the discretion of the court before which enforcement is sought
and except as rights to indemnification may be limited by applicable law.

   2.25  Non-Contravention; Consents. Except as set forth in Part 2.25 of the
 Disclosure Schedule, neither the execution and delivery of any of the 
Transactional Agreements, nor the

                                      17

<PAGE>



consummation  or  performance  of any  of the  Transactions,  will  directly  or
indirectly (with or without notice or lapse of time):

         (a)  contravene,  conflict  with or result in a violation of (i) any of
the  provisions  of FDI's  articles  of  incorporation  or  bylaws,  or (ii) any
resolution  adopted  by FDI's  stockholders,  FDI's  board of  directors  or any
committee of FDI's board of directors;

         (b) contravene,  conflict with or result in a violation of, or give any
Governmental Body or other Person the right to challenge any of the Transactions
or to exercise any remedy or obtain any relief under,  any Legal  Requirement or
any Order to which FDI or the  Companies,  or any of the assets owned or used by
FDI, is subject;

         (c) cause FDI to become subject to, or to become liable for the payment
of, any Tax;

         (d) cause any of the assets  owned or used by FDI to be  reassessed  or
revalued by any taxing authority or other Governmental Body;

         (e)  contravene,  conflict  with or result in a violation of any of the
terms or  requirements  of, or give any  Governmental  Body the right to revoke,
withdraw,  suspend, cancel, terminate or modify, any Governmental  Authorization
that is held by FDI or any of its employees or that  otherwise  relates to FDI's
business or to any of the assets owned or used by FDI;

         (f) contravene, conflict with or result in a violation or breach of, or
result in a default under, any provision of any FDI Contract;

         (g) give any Person the right to (i) declare a default or exercise  any
remedy under any FDI Contract,  (ii)  accelerate  the maturity or performance of
any FDI Contract, or (iii) cancel, terminate or modify any FDI Contract;

         (h) contravene,  conflict with or result in a violation or breach of or
a default  under any  provision  of, or give any  Person  the right to declare a
default under, any Contract to which any of the Companies is a party or by which
any of the Companies is bound; or

         (i) result in the  imposition  or creation of any  Encumbrance  upon or
with respect to any asset owned or used by FDI.

Except as set forth in Part 2.25 of the Disclosure Schedule, neither FDI nor the
Parent  Companies  were, are or will be required to make any filing with or give
any notice to, or to obtain any Consent from, any Person in connection  with the
execution  and  delivery  of  any  of  the   Transactional   Agreements  or  the
consummation or performance of any of the Transactions.

   2.26  Brokers.  Neither  FDI nor the Parent  Companies  have agreed or become
obligated  to pay,  or has taken any  action  that  might  result in any  Person
claiming to be entitled to receive,  any brokerage  commission,  finder's fee or
similar commission or fee in connection with any of the Transactions.

   2.27  Full Disclosure.

         (a) None of the Transactional  Agreements  contains or will contain any
untrue statement of fact; and none of the Transactional Agreements omits or will
omit to state any fact necessary to make any of the representations,  warranties
or other statements or information contained therein not misleading.


                                      18

<PAGE>



         (b) Except as set forth in Part 2.27 of the Disclosure Schedule,  there
is no fact  within the  Knowledge  of FDI or the Parent  Companies  (other  than
publicly  known facts relating  exclusively to political or economic  matters of
general  applicability that will adversely affect all Comparable  Entities) that
(i) may have a material  adverse effect on FDI's  business,  condition,  assets,
liabilities,  operations,  financial performance, net income or prospects (or on
any aspect or portion  thereof) or on the ability of FDI or the Parent Companies
to  comply  with  or  perform  any  covenant  or  obligation  under  any  of the
Transactional Agreements,  or (ii) may have the effect of preventing,  delaying,
making illegal or otherwise interfering with any of the Transactions.

         (c) All of the  information set forth in the Disclosure  Schedule,  and
all other  written  information  regarding  the  respective  Companies and their
business, condition, assets, liabilities, operations, financial performance, net
income and  prospects  that has been  furnished  to the  Purchaser or any of its
Representatives  by or on  behalf  of FDI or any of  FDI's  Representatives,  is
accurate and complete in all respects.

         (d) FDI and the Parent  Companies  have  provided the Purchaser and the
Purchaser's  Representatives  with  full  and  complete  access  to all of FDI's
records and other documents.

SECTION 3.     REPRESENTATIONS AND WARRANTIES OF PURCHASER

   Except as disclosed on Purchaser's  Disclosure  Schedule  attached  hereto as
Exhibit E, the  Purchaser  represents  and  warrants,  to and for the benefit of
RadNet and Primedex, as follows:

   3.1 Acquisition of Shares. The Purchaser is not acquiring the Shares with the
intention of making a public distribution thereof.

   3.2   Authority; Binding Nature of Agreement.Upon the adoption of appropriate
resolutions by the Purchaser's board of directors:

         (a) the  Purchaser  will have the right,  power and  authority to enter
into and perform its obligations under this Agreement;

         (b) the  execution,  delivery and  performance of this Agreement by the
Purchaser will have been duly authorized by all necessary  action on the part of
the Purchaser and its board of directors; and

         (c) this  Agreement  will  constitute  the  legal,  valid  and  binding
obligation  of the  Purchaser,  enforceable  against the Purchaser in accordance
with its terms.

         (d) no further corporate authorization will be necessary on the part of
Purchaser to consummate the Transactions.

   3.3  Organization  Good  Standing  and  Qualification.  The  Purchaser  is  a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware with all  necessary  power and authority to execute and
deliver this Agreement, to performs its obligations hereunder, and to consummate
the Transactions.

   3.4 Valid and  Binding  Agreement.  This  Agreement,  and when  executed  and
delivered, the License Agreement and the Non-Competition  Agreement,  constitute
and will constitute the legal,  valid and binding  obligations of the Purchaser,
enforceable  against the Purchaser in accordance  with their  respective  terms,
except,  in  each  case,  to  the  extent  limited  by  bankruptcy,  insolvency,
reorganization and other laws affecting  creditors'  generally,  and except that
the remedy of specific performance or similar equitable relief is available only
at the discretion of the court before which  enforcement is sought and except as
rights to indemnification may be limited by applicable law.

                                      19

<PAGE>



   3.5 No Breach of Statute or Contract.  Neither the  execution and delivery of
this Agreement,  the License Agreement nor the Non-Competition  Agreement by the
Purchaser nor compliance  with the terms and provisions of this  Agreement,  the
License  Agreement or the Non-  Competition  Agreement on the part of Purchaser,
will:  (a) violate  any statute or  regulation  of any  governmental  authority,
domestic or foreign,  affecting the  Purchaser;  (b) require the issuance to the
Purchaser of any authorization,  license,  consent or approval of any federal or
state governmental  agency; or (c) conflict with or result in a breach of any of
the terms, conditions or provisions of any judgment, order, injunction,  decree,
note  indenture,  loan  agreement or other  agreement or instrument to which the
Purchaser  is a party,  or by which the  Purchaser  is bound,  or  constitute  a
default  thereunder,  except for such  conflicts,  breaches  or  defaults,  that
individually  or in the aggregate,  would not have a material  adverse effect on
Purchaser's  business,  financial condition,  assets,  liabilities,  operations,
financial  performance,  net  income or  prospects  (or on any aspect or portion
thereof).

   3.6   Full Disclosure.

         (a) None of the Transactional  Agreements  contains or will contain any
untrue statement of fact; and none of the Transactional Agreements omits or will
omit to state any fact necessary to make any of the representations,  warranties
or other statements or information contained therein not misleading.

         (b) There is no fact  within the  Knowledge  or  Purchaser  (other than
publicly  known facts relating  exclusively to political or economic  matters of
general  applicability that will adversely affect all Comparable  Entities) that
(i) may have a  material  adverse  effect on  Purchaser's  business,  condition,
assets, liabilities,  operations, financial performance, net income or prospects
(or on any aspect or portion  thereof) or on the ability of  Purchaser to comply
with or  perform  any  covenant  or  obligation  under any of the  Transactional
Agreements, or (ii) may have the effect of preventing,  delaying, making illegal
or otherwise interfering with any of the Transactions.

         (c) All of the written  information  regarding  the  Purchaser  and its
business, condition, assets, liabilities, operations, financial performance, net
income and prospects that has been furnished to FDI, RadNet or Primedex,  or any
of  their   Representatives  by  or  on  behalf  of  Purchaser  of  any  of  its
Representatives is accurate and complete in all respects.

   3.7 Brokers. The Purchaser has not agreed or become obligated to pay, and has
not taken any action that might result in any Person  claiming to be entitled to
receive, any brokerage commission,  finder's fee or similar commission or fee in
connection with any of the Transactions.

SECTION 4.     PRE-CLOSING COVENANTS OF FDI, RADNET AND PRIMEDEX

   4.1 Access and Investigation. FDI and the Parent Companies shall ensure that,
at all times during the Pre-Closing Period:

         (a) FDI and its Representatives  upon reasonable advance notice to FDI,
during normal  business  hours and without  undue  disruption of the business of
FDI, provide the Purchaser and its Representatives with free and complete access
to FDI's  Representatives,  personnel  and  assets  and to all  existing  books,
records,  Tax Returns,  work papers and other documents and information relating
to FDI;

         (b)  FDI  and  its  Representatives   provide  the  Purchaser  and  its
Representatives with such copies of existing books,  records, Tax Returns,  work
papers and other documents and information  relating to FDI as the Purchaser may
request in good faith; and


                                      20

<PAGE>



         (c) FDI and its  Representatives  compile and provide the Purchaser and
its Representations with such additional financial, operating and other data and
information relating to FDI as the Purchaser may request in good faith.

   4.2 Operation of Business.  FDI and the Parent  Companies  shall ensure that,
during the Pre-Closing Period:

         (a) RadNet does not directly or indirectly sell or otherwise  transfer,
or  offer,  agree or commit  (in  writing  or  otherwise)  to sell or  otherwise
transfer,  any of the Shares or any interest in or right  relating to any of the
Shares;

         (b) RadNet  does not permit,  or offer,  agree or commit (in writing or
otherwise)  to  permit,  any  of the  Shares  to  become  subject,  directly  or
indirectly, to any Encumbrance;

         (c) FDI conducts its operations  exclusively in the Ordinary  Course of
Business and in the same manner as such  operations have been conducted prior to
the date of this Agreement;

         (d) FDI  utilizes  its Best  Efforts to  preserve  intact  its  current
business  organization,  keep available the services of its current officers and
employees  and  maintain  its  relations  and  good  will  with  all  suppliers,
customers,  landlords,  creditors,  licensors,  licensees,  employees  and other
Persons having business relationships with FDI;

         (e) FDI keeps in full force all insurance  policies  identified in Part
2.20 of the Disclosure Schedule;

         (f) FDI immediately notifies the Purchaser of any inquiry,  proposal or
offer from any Person relating to any Acquisition Transaction;

         (g) FDI does not declare, accrue, set aside or pay any dividend or make
any other  distribution in respect of any shares of capital stock,  and does not
repurchase,  redeem or otherwise  reacquire any shares of capital stock or other
securities;

         (h) FDI does not sell or otherwise issue any shares of capital stock or
any other securities;

         (i) FDI does not amend its  articles of  incorporation  or bylaws,  and
does  not   effect   or   become  a  party  to  any   Acquisition   Transaction,
recapitalization,  reclassification of shares,  stock split, reverse stock split
or similar transaction;

         (j) FDI does not form any subsidiary or acquire any equity  interest or
other interest in any other Entity;

         (k) FDI does  not make any  capital  expenditure,  except  for  capital
expenditures  that are made in the Ordinary  Course of Business  and that,  when
added to all  other  capital  expenditures  made on  behalf  of FDI  during  the
Pre-Closing Period, do not exceed $25,000 in the aggregate;

         (l) FDI does not enter into or permit  any of the assets  owned or used
by FDI to become bound by any Contract, except for any Excluded Contract;

         (m) FDI does not  incur,  assume or  otherwise  become  subject  to any
Liability,  except for current liabilities (of the type required to be reflected
in the "liabilities" column of a balance sheet prepared in accordance with GAAP)
incurred in the Ordinary Course of Business;


                                      21

<PAGE>



         (n) FDI does not establish or adopt any Employee Benefit Plan, and does
not pay any bonus or make any  profit-sharing or similar payment to, or increase
the  amount  of  the  wages,  salary,  commissions,  fringe  benefits  or  other
compensation  or  remuneration  payable  to, any of its  directors,  officers or
employees;

         (o) FDI does not change any of its methods of  accounting or accounting
practices in any respect;

         (p)   FDI does not make any Tax election;

         (q) FDI does not commence any Proceeding out of the Ordinary  Course of
Business;

         (r) FDI does not enter into any transaction or take any other action of
the type referred to in Section 2.5;

         (s) FDI does not enter into any  transaction  or take any other  action
outside the Ordinary Course of Business;

         (t) FDI does not enter into any  transaction  or take any other  action
that might cause or constitute a breach of any  representation  or warranty made
by FDI or the Companies in this Agreement or in the Closing Certificate; and

         (u) FDI does not agree, commit or offer (in writing or otherwise),  and
does not attempt,  to take any of the actions described in clauses "(k)" through
"(t)" of this Section 4.2.

   4.3 Filings and Consents. FDI and the Parent Companies shall ensure that:

         (a) any filing or notice  required to be made or given (pursuant to any
applicable  Legal  Requirement,  Order or Contract,  or otherwise) by FDI or the
Parent  Companies in  connection  with the  execution and delivery of any of the
Transactional  Agreements or in connection with the  consummation or performance
of any of the  Transactions  is made or given as soon as possible after the date
of this Agreement;

         (b) each Consent  required to be obtained  (pursuant to any  applicable
Legal  Requirement,  Order  or  Contract,  or  otherwise)  by FDI or the  Parent
Companies  in  connection  with  the  execution  and  delivery  of  any  of  the
Transactional  Agreements or in connection with the  consummation or performance
of any of the  Transactions  (including each of the Consents  identified in Part
2.25 of the Disclosure  Schedule) is obtained as soon as possible after the date
of this Agreement and remains in full force and effect through the Closing Date;

         (c) FDI promptly  delivers to the Purchaser a copy of each filing made,
each  notice  given and each  Consent  obtained  by FDI or the Parent  Companies
during Pre-Closing Period; and

         (d)  during  the  Pre-Closing   Period,  FDI  and  its  Representatives
cooperate  with the  Purchaser  and with the  Purchaser's  Representatives,  and
prepare and make  available  such  documents  and take such other actions as the
Purchaser may request in good faith,  in connection  with any filing,  notice or
Consent that the Purchaser is required or elects to make, give or obtain.

   4.4  Notification;  Updates to Disclosure  Schedule.  During the  Pre-Closing
Period,  FDI and the Parent  Companies  shall  promptly  notify the Purchaser in
writing of:

         (a)  the  discovery  by FDI  or  the  Parent  Companies  of any  event,
condition, fact or circumstance that occurred or existed on or prior to the date
of this Agreement and that caused or

                                      22

<PAGE>



constitutes a breach of any representation or warranty made by FDI or the Parent
Companies in this Agreement;

         (b) any event,  condition,  fact or circumstance that occurs, arises or
exists  after the date of this  Agreement  and that would cause or  constitute a
breach of any  representation or warranty made by FDI or the Parent Companies in
this  Agreement if (A) such  representation  or warranty had been made as of the
time of the occurrence, existence or discovery of such event, condition, fact or
circumstance,  or (B) such event, condition,  fact or circumstance had occurred,
arisen or existed on or prior to the date of this Agreement;

         (c) any  breach of any  covenant  or  obligation  of FDI or the  Parent
Companies; and

         (d) any event, condition, fact or circumstance that may make the timely
satisfaction  of any of the  conditions  set  forth in  Section  6 or  Section 7
impossible or unlikely.

   4.5 Payment of Indebtedness by Related Parties.  FDI and the Parent Companies
shall cause all indebtedness and other  Liabilities of each Related Party to FDI
(including any such  indebtedness or other Liability  identified in Part 2.21 of
the Disclosure Schedule) to be assumed by the Parent Companies or discharged and
paid in full prior to the Closing except for the accounts payable of FDI related
to medical  services  providers for services  provided  through the Closing Date
(the "Imaging Center Payables").

   4.6 No Negotiation.  FDI and the Parent  Companies shall ensure that,  during
the Pre-Closing Period, neither FDI nor any of FDI's Representatives directly or
indirectly:

         (a) solicits or encourages the  initiation of any inquiry,  proposal or
offer from any Person  (other than the  Purchaser)  relating to any  Acquisition
Transaction;

         (b)  participates in any discussions or negotiations  with, or provides
any non-public information to, any Person (other than the Purchaser) relating to
any Acquisition Proposal; or

         (c) considers the merits of any unsolicited inquiry,  proposal or offer
from  any  Person  (other  than  the  Purchaser)  relating  to  any  Acquisition
Transaction.

   4.7 Best Efforts. During the Pre-Closing Period, FDI and the Parent Companies
shall use their Best Efforts to cause the conditions set forth in Sections 6 and
7.3 to be satisfied on a timely basis.

   4.8  Confidentiality.  FDI and the Parent Companies shall ensure that, during
the Pre-Closing Period:

         (a)   FDI and its Representatives keep strictly confidential the 
existence and terms of this Agreement;

         (b) neither FDI nor any of its  Representatives  issues or disseminates
any press release or other  publicity or otherwise  makes any  disclosure of any
nature (to any of FDI's suppliers,  customers, landlords, creditors or employees
or to any other Person) regarding any of the Transactions,  except to the extent
that  FDI  is  required  by  law to  make  any  such  disclosure  regarding  the
Transactions; and

         (c) if FDI is  required  by law to make any  disclosure  regarding  the
Transactions, FDI advises the Purchaser, at least one business day before making
such disclosure, of the nature and content of the intended disclosure.


                                      23

<PAGE>



   4.9 Excluded  Assets.  Prior to the Closing,  the Parent Companies will cause
the  Excluded  Assets  to be  assigned  and  transferred  by FDI to RadNet or an
affiliate  of RadNet,  such that as of the Closing the  Excluded  Assets will no
longer be assets of FDI.

   4.10 Excluded  Liabilities.  Prior to the Closing,  the Parent Companies will
cause the  Excluded  Liabilities  to be  assumed  by RadNet or an  affiliate  of
RadNet.

SECTION 5.     PRE-CLOSING COVENANTS OF PURCHASER

   5.1 Best Efforts. During the Pre-Closing Period, Purchaser shall use its Best
Efforts  to cause the  conditions  set forth in Section 7 to be  satisfied  on a
timely basis.

   5.2  Confidentiality.  Purchaser  shall ensure that,  during the  Pre-Closing
Period:

         (a)   Purchaser and its Representatives keep strictly confidential the 
existence and terms of this Agreement;

         (b)  neither  Purchaser  nor  any  of  its  Representatives  issues  or
disseminates  any  press  release  or other  publicity  or  otherwise  makes any
disclosure of any nature (to any of Purchaser's suppliers, customers, landlords,
creditors  or  employees  or  to  any  other   Person)   regarding  any  of  the
Transactions, except to the extent that Purchaser is required by law to make any
such disclosure regarding the Transactions; and

         (c) if  Purchaser is required by law to make any  disclosure  regarding
the  Transactions,  Purchaser  advises FDI, at least five  business  days before
making such disclosure, of the nature and content of the intended disclosure.

SECTION 6.     CONDITIONS PRECEDENT TO PURCHASER'S OBLIGATION TO CLOSE
   The  Purchaser's  obligation  to  purchase  the  Shares and to take the other
actions  required to be taken by the  Purchaser at the Closing is subject to the
satisfaction,  at or prior to the Closing,  of each of the following  conditions
(any of which may be waived by the Purchaser, in whole or in part, in accordance
with Section 11.11):

   6.1 Accuracy of  Representations.  All of the  representations and warranties
made  by  FDI  and  the  Parent   Companies   in  this   Agreement   (considered
collectively),  and  each of said  representations  and  warranties  (considered
individually),  shall have been accurate in all material respects as of the date
of this  Agreement,  and shall be  accurate in all  material  respects as of the
Closing Date as if made at the Closing Date, without giving effect to any update
to the Disclosure Schedule.

   6.2   Performance of Obligations.

         (a) RadNet  shall have  delivered  to the  Purchaser  the  certificates
representing the Shares as required by Section 1.3(b)(i).

         (b) All of the other covenants and obligations  that FDI and the Parent
Companies  are  required to comply with or to perform at or prior to the Closing
(considered   collectively),   and  each  of  said  covenants  and   obligations
(considered  individually),  shall have been duly complied with and performed in
all material respects.

   6.3 Consents.  Each of the Consents identified in Part 2.25 of the Disclosure
Schedule shall have been obtained and shall be in full force and effect.


                                      24

<PAGE>



   6.4 No Adverse  Change.  There shall have been no material  adverse change in
FDI's  business,   condition,   assets,   liabilities,   operations,   financial
performance,  net income or  prospects  (or in any  material  aspect or material
portion thereof) since the date of this Agreement.

   6.5   Additional Documents.  Purchaser shall have received the following 
documents:

         (a) an  opinion  letter  from  Primedex's  general  counsel,  dated the
Closing Date, in the form of Exhibit F; and

         (b) such other documents as the Purchaser may request in good faith for
the purpose of (i)  evidencing  the accuracy of any  representation  or warranty
made by FDI or the Parent  Companies,  (ii)  evidencing the compliance by FDI or
the Parent Companies with, or the performance by FDI or the Parent Companies of,
any covenant or obligation  set forth in this  Agreement,  (iii)  evidencing the
satisfaction  of any  condition  set forth in this Section 6, or (iv)  otherwise
facilitating the consummation or performance of any of the Transactions.

   6.6 No Proceedings.  Since the date of this  Agreement,  there shall not have
been  commenced  or  threatened  against  the  Purchaser,  or against any Person
affiliated with the Purchaser, any Proceeding (a) involving any challenge to, or
seeking damages or other relief in connection with, any of the Transactions,  or
(b)  that may have  the  effect  of  preventing,  delaying,  making  illegal  or
otherwise interfering with any of the Transactions.

   6.7 No Claim Regarding Stock Ownership or Sale Proceeds. No Person shall have
made or threatened any claim asserting that such Person (a) may be the holder or
the  beneficial  owner  of,  or may  have  the  right to  acquire  or to  obtain
beneficial  ownership of, any capital  stock or other  securities of FDI, or (b)
may be entitled to all or any portion of the Purchase Price.

   6.8 No Prohibition.  Neither the  consummation  nor the performance of any of
the Transactions  will,  directly or indirectly (with or without notice or lapse
of time),  contravene or conflict with or result in a violation of, or cause the
Purchaser  or any Person  affiliated  with the  Purchaser  to suffer any adverse
consequence under, any applicable Legal Requirement or Order.

   6.9 Sublease.  FDI and RadNet shall have  executed the Sublease,  the form of
which is attached hereto as Exhibit G, which shall provide FDI with the right to
rent-free occupancy of its principal offices at 1516 Cotner Avenue, Los Angeles,
California 90025 for a period of twelve (12) months from the Closing Date.

   6.10 Non-Competition and Nondisclosure Agreement. Each of Primedex and RadNet
shall have executed the  Noncompetition  and  Nondisclosure  Agreement  attached
hereto as Exhibit H.

   6.11  License  Agreement.  Each of RadNet  and FDI shall  have  executed  the
License Agreement attached hereto as Exhibit J.

   6.12 Employment  Agreements.  The Purchaser or FDI shall have entered into an
employment agreement with Jaana Shellock in form reasonably  satisfactory to the
Purchaser.

   6.13 Proceedings and Instruments Satisfactory. All proceedings to be taken in
connection  with  the  transactions  contemplated  by  this  Agreement,  and all
documents  incidental  thereto,  shall be  reasonably  satisfactory  in form and
substance to Purchaser and its counsel.


                                      25

<PAGE>



SECTION 7.     CONDITIONS PRECEDENT TO RADNET'S OBLIGATION TO CLOSE.

   RadNet's obligation to sell the Shares and to take the other actions required
to be taken by RadNet at the Closing is subject to the satisfaction, at or prior
to the Closing, of each of the following  conditions (any of which may be waived
by RadNet, in whole or in part, in accordance with Section 11.11):

   7.1 Accuracy of  Representations.  All of the  representations and warranties
made by the Purchaser in this Agreement (considered  collectively),  and each of
said representations and warranties (considered  individually),  shall have been
accurate in all material  respects as of the date of this Agreement and shall be
accurate  in all  material  respects  as of the  Closing  Date as if made at the
Closing Date.

   7.2  Performance of  Obligations.  All of the other covenants and obligations
that the  Purchaser  is required  to comply with or to perform  pursuant to this
Agreement at or prior to the Closing (considered collectively), and each of said
covenants and obligations  (considered  individually),  shall have been complied
with and performed in all material respects.

   7.3 No  Injunction.  There shall not be in effect any  injunction  that shall
have been  entered by a court of competent  jurisdiction  since the date of this
Agreement and that prohibits the sale of the Shares by RadNet to the Purchaser.

   7.4   Non-Competition   Agreement.   Purchaser   shall  have   executed   the
Non-Competition Agreement attached hereto as Exhibit H.

   7.5 License  Agreement.  Purchaser shall have executed the License  Agreement
attached hereto as Exhibit J.

   7.6 Legal  Opinion.  RadNet shall have  received the  following  documents an
opinion  letter from Cooley  Godward LLP, dated the Closing Date, in the form of
Exhibit K.

   7.7  Proceedings and  Instruments.  All proceedings to be taken in connection
with  the  transactions  contemplated  by  this  Agreement,  and  all  documents
incidental  thereto,  shall be reasonably  satisfactory in form and substance to
RadNet and its counsel.

   7.8  Resolutions.  RadNet shall have received  certified  Resolutions  of the
Board of Directors of the Purchaser,  in form reasonably satisfactory to counsel
for RadNet,  authorizing the Purchaser's execution,  delivery and performance of
this Agreement and the actions to be taken by Purchaser hereunder.

   7.9 Good  Standing  Certificates.  RadNet shall have  received  good standing
certificates  issued by the  Secretary of State of Delaware  with respect to the
Purchaser, dated within one week prior to the Closing Date.

   7.10 Consents. RadNet shall have received any and all agreements and consents
of any  governmental  authorities and agencies,  and any parties to any material
contracts or agreements of RadNet, to the extent required in connection with the
transactions contemplated by this Agreement.

SECTION 8.     TERMINATION

   8.1  Termination  Events.  This  Agreement  may be  terminated  prior  to the
Closing:

         (a) by the Purchaser if (i) there is a material  breach of any covenant
or obligation of FDI or the Parent Companies,  or (ii) the Purchaser  reasonably
determines that the timely satisfaction

                                      26

<PAGE>



of any  condition set forth in Section 6 has become  impossible  or  impractical
(other  than as a result of any failure on the part of the  Purchaser  to comply
with or perform its covenants and obligations under this Agreement);

         (b) by RadNet  if (i) there is a  material  breach of any  covenant  or
obligation  of the  Purchaser,  or (ii) RadNet  reasonably  determines  that the
timely  satisfaction  of  any  condition  set  forth  in  Section  7 has  become
impossible or impractical  (other than as a result of any failure on the part of
FDI or the Parent Companies to comply with or perform any covenant or obligation
set forth in this Agreement);

         (c) by the  Purchaser  if the  Closing has not taken place on or before
September  15,  1997  (other  than as a result of any failure on the part of the
Purchaser to comply with or perform its  covenants  and  obligations  under this
Agreement);

         (d) by RadNet if the Closing has not taken place on or before September
15, 1997 (other than as a result of the failure on the part of FDI or the Parent
Companies to comply with or perform any covenant or obligation set forth in this
Agreement); or

         (e) by the mutual consent of the Purchaser and RadNet.

   8.2  Termination  Procedures.  If the  Purchaser  wishes  to  terminate  this
Agreement  pursuant to Section  8.1(a) or Section  8.1(c),  the Purchaser  shall
deliver to RadNet a written  notice  stating that the  Purchaser is  terminating
this  Agreement and setting forth a brief  description of the basis on which the
Purchaser is  terminating  this  Agreement.  If RadNet wishes to terminate  this
Agreement pursuant to Section 8.1(b) or Section 8.1(d),  RadNet shall deliver to
the Purchaser a written notice stating that RadNet is terminating this Agreement
and  setting  forth  a  brief  description  of the  basis  on  which  RadNet  is
terminating this Agreement.

   8.3 Effect of  Termination.  If this  Agreement  is  terminated  pursuant  to
Section 8.1, all further  obligations of the parties under this Agreement  shall
terminate; provided, however, that:

         (a) no party  shall be relieved of any  obligation  or other  Liability
arising from any breach by such party of any provision of this Agreement;

         (b) the parties shall,  in all events,  remain bound by and continue to
be subject to the provisions set forth in Section 10; and

         (c) the parties shall,  in all events,  remain bound by and continue to
be subject to Sections 4.8 and 5.2.

   8.4 Nonexclusivity of Termination  Rights. The termination rights provided in
Section 8.1 shall not be deemed to be  exclusive.  Accordingly,  the exercise by
any party of its right to terminate this Agreement pursuant to Section 8.1 shall
not be  deemed  to be an  election  of  remedies  and  shall  not be  deemed  to
prejudice, or to constitute or operate as a waiver of, any other right or remedy
that such party may be entitled to exercise (whether under this Agreement, under
any other  Contract,  under any  statute,  rule or other Legal  Requirement,  at
common law, in equity or otherwise).

                                      27

<PAGE>




SECTION 9.     INDEMNIFICATION, ETC.

   9.1   Survival of Representations and Covenants.

         (a) The representations,  warranties, covenants and obligations of each
party shall survive for a period of two years from and after the Closing Date:

               (i)   the Closing and the sale of the Shares to the Purchaser;

               (ii)  any sale or other disposition of any or all of the Shares
by the Purchaser ;
and

               (iii)  any  Acquisition  Transaction  effected  by  or  otherwise
involving the Purchaser or FDI.

         (b) For  purposes of this  Agreement,  each  statement or other item of
information  set  forth  in the  Disclosure  Schedule  or in any  update  to the
Disclosure  Schedule shall be deemed to be a representation and warranty made by
FDI and the Parent Companies in this Agreement.

   9.2 Indemnification by RadNet and Primedex. RadNet and Primedex,  jointly and
severally,  shall hold harmless and indemnify each of the  Indemnitees  from and
against,  and shall  compensate and reimburse each of the  Indemnitees  for, any
Damages  which are  directly  or  indirectly  suffered or incurred by any of the
Indemnitees or to which any of the Indemnitees  may otherwise  become subject at
any time  (regardless of whether or not such Damages  relate to any  third-party
claim) and which arise  directly or  indirectly  from or as a direct or indirect
result of, or are directly or indirectly connected with:

               (i)   any breach of any representation or warranty made by FDI or
 the Parent Companies in this Agreement;

               (ii)  any  breach  of any  representation,  warranty,  statement,
information or provision  contained in the  Disclosure  Schedule or in any other
document  executed and delivered to the Purchaser or any of its  Representatives
at the Closing by or on behalf of FDI or any of FDI's Representatives;

               (iii) any breach of any covenant or obligation of FDI or the 
Parent Companies;
or

               (iv) any  Liability to which FDI or any of the other  Indemnitees
may become  subject  and that  arises  directly  or  indirectly  from or relates
directly or indirectly to any service  performed,  by or on behalf of any of the
Companies on or at any time prior to the Closing Date.

In addition, RadNet and Primedex, jointly and severally, shall hold harmless and
indemnify each of the  Indemnitees  from and against,  and shall  compensate and
reimburse  each of the  Indemnitees  for,  any  Damages  relating to any and all
Excluded Liabilities.

         9.3 Indemnification by the Purchaser. The Purchaser shall hold harmless
and  indemnify  each of the Primedex  Indemnitees  from and  against,  and shall
compensate and reimburse each of the Primedex Indemnitees for, any Damages which
are  directly  or  indirectly  suffered  or  incurred  by any  of  the  Primedex
Indemnitees  or to which any of the Primedex  Indemnitees  may otherwise  become
subject at any time  (regardless  of whether or not such  Damages  relate to any
third-party claim) and which arise directly or indirectly from or as a direct or
indirect result of, or are directly or indirectly connected with:

                                      28

<PAGE>



               (i) any  breach by any  representation  or  warranty  made by the
Purchaser  in  this  Agreement  (without  giving  effect  to any  update  to the
Purchaser's Disclosure Schedule);

               (ii)  any  breach  of any  representation,  warranty,  statement,
information or provision contained in the Purchaser's  Disclosure Schedule or in
any other document delivered or otherwise made available to the Companies or any
of  their  Representatives  by or on  behalf  of  the  Purchaser  or  any of its
Representatives;

               (iii) any breach of any covenant or obligation of the Purchaser; 
or

               (iv) any  Liability to which the Primedex or RadNet or any of the
other  Primedex  Indemnitees  may become  subject  and that  arises  directly or
indirectly from or relates directly or indirectly to any service  performed,  by
or on  behalf  of FDI on or at any time  after to the  Closing  Date,  except as
specifically contemplated hereby.

   9.4 No Contribution. Each of RadNet and Primedex waives, and acknowledges and
agrees that RadNet and Primedex  shall not have and shall not exercise or assert
or  attempt  to  exercise  or  assert,  any  right of  contribution  or right of
indemnity  or any  other  right or remedy  against  FDI in  connection  with any
indemnification  obligation or any other  Liability to which RadNet and Primedex
may become  subject  under any of the  Transactional  Agreements or otherwise in
connection with any of the Transactions.

   9.5  Interest.  Any party that is  required  to  indemnify  any other  Person
pursuant to this Section 9 with respect to any Damages shall also be required to
pay such other  Person  interest on the amount of such  Damages  (for the period
commencing as of the date on which such other Person first incurred or otherwise
became  subject to such  Damages and ending on the date on which the  applicable
indemnification  payment is made by such party) at a floating  rate equal to the
lesser of (i)  three  percentage  points  above  the rate of  interest  publicly
announced by Bank of America,  N.T. & S.A. from time to time as its prime,  base
or reference rate or (ii) the maximum rate permitted by applicable law.

   9.6  Setoff.  In  addition  to any rights of setoff or other  rights that the
Purchaser or any of the other  Indemnitees  may have at common law or otherwise,
the  Purchaser  shall have the right  (after  obtaining a favorable  decision in
arbitration pursuant to this Agreement or in a court of competent  jurisdiction)
to set off any amount that may be owed to any  Indemnitee  under this  Section 9
against any amount otherwise payable by any Indemnitee to RadNet.

   9.7 Nonexclusivity of Indemnification  Remedies. The indemnification remedies
and  other  remedies  provided  in this  Section  9 shall  not be  deemed  to be
exclusive.  Accordingly,  the  exercise by any Person of any of its rights under
this  Section 9 shall not be deemed to be an election of remedies  and shall not
be deemed to  prejudice,  or to  constitute or operate as a waiver of, any other
right or remedy that such Person may be entitled to exercise (whether under this
Agreement,  under any other  Contract,  under any  statute,  rule or other Legal
Requirement, at common law, in equity or otherwise).

   9.8  Defense  of  Third  Party  Claims.  In the  event  of the  assertion  or
commencement  by any Person of any claim or  Proceeding  (whether  against  FDI,
against any other  Indemnitee or against any other Person) with respect to which
any of RadNet and Primedex may become  obligated to  indemnify,  hold  harmless,
compensate or reimburse any Indemnitee pursuant to this Section 9, the Purchaser
shall have the right,  at its  election,  to  designate  RadNet and  Primedex to
assume the defense of such claim or Proceeding at the sole expense of RadNet and
Primedex.  If the Purchaser so elects to designate RadNet and Primedex to assume
the defense of any such claim or Proceeding:


                                      29

<PAGE>



         (a)  RadNet  and  Primedex  shall  proceed  to  defend  such  claim  or
Proceeding in a diligent manner with counsel satisfactory to the Purchaser;

         (b) the  Purchaser  shall make  available  to RadNet and  Primedex  any
non-privileged  documents and materials in the  possession of the Purchaser that
may be necessary to the defense of such claim or Proceeding;

         (c)  RadNet  and  Primedex  shall keep the  Purchaser  informed  of all
material developments and events relating to such claim or Proceeding;

         (d) the Purchaser shall have the right to participate in the defense of
such claim or Proceeding;

         (e) RadNet and Primedex  shall not settle,  adjust or  compromise  such
claim  or  Proceeding  without  the  prior  written  consent  of the  Purchaser;
provided, however, that Purchaser shall not unreasonably withhold such consent.

If the Purchaser  does not elect to designate  RadNet and Primedex to assume the
defense of any such claim or  Proceeding  (or if,  after  initially  designating
RadNet and Primedex to assume such defense,  the Purchaser elects to assume such
defense), the Purchaser may proceed with the defense of such claim or Proceeding
on its own. If the  Purchaser so proceeds  with the defense of any such claim or
Proceeding on its own:

               (i)  all  expenses  relating  to the  defense  of such  claim  or
Proceeding  (whether or not incurred by the  Purchaser)  shall be borne and paid
exclusively by RadNet and Primedex;

               (ii) RadNet and Primedex  shall make  available to the  Purchaser
any documents and materials in their possession or control that may be necessary
to the defense of such claim or Proceeding;

               (iii) the  Purchaser  shall keep RadNet and Primedex  informed of
all material developments and events relating to such claim or Proceeding; and

               (iv) the  Purchaser  shall  have the right to  settle,  adjust or
compromise  such claim or  Proceeding  with the consent of RadNet and  Primedex;
provided, however, that RadNet and Primedex shall not unreasonably withhold such
consent.

In the event that the  Purchaser  shall be obligated  to  indemnify  Primedex or
RadNet  pursuant  to this  Section 9,  Primedex  and RadNet  shall have the same
rights and  obligations as Primedex  Indemnitees as the Purchaser has under this
Section 9.7 as an Indemnitee.

   9.9 Exercise of Remedies by Certain.  No Indemnitee (other than the Purchaser
or any  successor  thereto or assign  thereof)  shall be permitted to assert any
indemnification  claim or exercise any other remedy under this Agreement  unless
the Purchaser (or any successor  thereto or assign thereof) shall have consented
to the  assertion  of such  indemnification  claim or the exercise of such other
remedy. No Primedex  Indemnitee (other than Primedex or any successor thereto or
assign  thereof)  shall be  permitted  to assert  any  indemnification  claim or
exercise any other remedy under this Agreement unless Primedex (or any successor
thereto  or assign  thereof)  shall  have  consented  to the  assertion  of such
indemnification claim or the exercise of such other remedy.

   9.10 Limitations on Certain Indemnitees.  Notwithstanding any other provision
of this  Agreement to the contrary,  neither RadNet nor Primedex shall be liable
to Purchaser  with respect to Damages  unless and until the aggregate  amount of
all Damages  incurred by Purchaser shall exceed the sum of $20,000;  and in such
case liability shall extend from the first dollar of Damages.

                                      30

<PAGE>



SECTION 10.    POST-CLOSING EVENTS

   10.1  Books  and  Records.  At any time and from  time to time and  after the
Closing  Date,  Purchaser  shall  permit  RadNet to have access,  during  normal
business hours and without undue  disruption of FDI's  business,  to those books
and records of FDI relating to periods prior to the Closing  Date,  for purposes
of preparing  any tax filings or any other  legitimate  purpose of RadNet.  Such
books and records may be made  available  at any  location  where FDI  maintains
same, and all costs and expenses relating to such access and inspection shall be
the  responsibility  of RadNet.  In the event that,  during the four year period
beginning  on the Closing  Date,  the  Purchaser  shall  determine to destroy or
dispose of any such books and records,  the Purchaser shall use its best efforts
to give  notice  thereof to RadNet not less than  thirty (30) days prior to such
disposition,  and RadNet shall have the right,  at its own cost and expense,  to
take possession of such books and records prior to their disposition.

   10.2  Employee Matters; Benefit Plan Matters.

         (a) Purchaser shall cause FDI to honor all accrued salary, vacation pay
and sick pay  benefits  owed to employees  of FDI.  Any such  benefits  shall be
calculated  as of the Closing Date and be offset  against the Purchase  Price in
accordance  with  Section 1.4 hereof.  In the event that FDI shall  determine to
terminate the employment of any such  employees  subsequent to the Closing Date,
then all severance  payments (if any) arising from such termination shall be the
responsibility of FDI. Nothing contained in this Section 10.2(a) shall be deemed
to constitute any assurance or guaranty of employment to any employees of FDI.

         (b)  Except  with  respect  to any  employees  of FDI who do not remain
employed with FDI from and after the Closing Date,  RadNet shall comply with all
requirements  of law in order to permit the  employees  of FDI to  withdraw  the
amounts in their  respective  accounts in the Primedex or RadNet 401(k) Plan and
any  other  employee  benefit  Plan(s)   covering   employees  or  one  or  more
RadNet-affiliated entities in addition to FDI.

         (c) Nothing  contained in this Agreement shall be deemed to abrogate or
impair the right of Purchaser to determine  which  employees will be retained by
FDI from and after the Closing Date,  and/or the compensation and benefits to be
paid  from and  after  the  Closing  Date to those  employees  retained  by FDI,
provided, however, that, subject to any required waiting periods and eligibility
criteria,  Purchaser  will cause all employees  retained by FDI on and after the
Closing Date to be offered the  opportunity  to  participate in the group health
programs generally offered to employees of Purchaser.

   10.3  Taxes.  To the  extent  that any Taxes  shall be  payable  on or in the
respect of the net income of FDI for periods  from and after the  Closing  Date,
(i) such taxes shall, subject to the Closing, constitute the sole responsibility
of FDI (subject to any consolidation effected by Purchaser), and (ii) subject to
the Closing,  such net income and taxes thereon shall not be reported or payable
by RadNet or any member of its consolidated tax group.

   10.4  Further  Assurances.  From time to time and after the Closing  Date the
parties  will take any and all action and execute and deliver to one another any
and all further agreements,  instruments,  certificates and other documents,  as
may reasonably be requested by any other party in order more fully to consummate
the transactions  contemplated  hereby, and to effect an orderly  transaction of
the ownership and operations of FDI.

SECTION 11.    MISCELLANEOUS PROVISIONS

   11.1 Joint and Several Liability. Subject to Section 9.3:


                                      31

<PAGE>



         (a) RadNet and Primedex  jointly and severally agree that they shall be
jointly and severally liable with FDI for the due and timely compliance with and
performance  of each of the covenants and  obligations  of FDI set forth in this
Agreement;

         (b) RadNet and Primedex  agree that each shall be jointly and severally
liable with the other for the due and timely  compliance with and performance of
each of the covenants and  obligations of the other set forth in this Agreement;
and

         (c) FDI agrees  that,  prior to the  Closing,  FDI shall be jointly and
severally liable with RadNet and Primedex for the due and timely compliance with
and  performance of each of the covenants and obligations of RadNet and Primedex
set forth in this Agreement (including the indemnification obligations of RadNet
and Primedex set forth in Section 9).

   11.2 Further  Assurances.  Each party hereto shall execute and/or cause to be
delivered to each other party hereto such instruments and other  documents,  and
shall take such other actions, as such other party may reasonably request (prior
to, at or after the Closing) for the purpose of carrying out or  evidencing  any
of the Transactions.

   11.3  Fees and Expenses.

         (a) Without  limiting the  generality of anything  contained in Section
11.3(b),  RadNet shall bear and pay all fees, costs and expenses  (including all
legal fees and expenses  payable to its counsel that have been  incurred or that
are in the future  incurred by, on behalf of or for the benefit of the Companies
in connection with:

               (i)   the negotiation, preparation and review of any term sheet 
or similar document relating to any of the Transactions;

               (ii) FDI's costs and expenses  associated with the  investigation
and review  conducted by the Purchaser and its  Representatives  with respect to
FDI's business;

               (iii) the  negotiation,  preparation and review of this Agreement
(including the Disclosure Schedule),  the other Transactional Agreements and all
certificates,  opinions and other  instruments and documents  delivered or to be
delivered by the Companies in connection with the Transactions;

               (iv) the  preparation  and  submission  of any  filing  or notice
required  to be made or given by the  Companies  in  connection  with any of the
Transactions,  and the  obtaining  of any  Consent  required  to be  obtained in
connection with any of the Transactions; and

               (v) the  consummation  and performance of the Transactions by the
Companies.

FDI shall not bear or pay, and RadNet and Primedex  shall not permit FDI to bear
or pay, any such fees, costs or expenses.

         (b)   Subject  to  the   provisions   of  Section  9   (including   the
indemnification  and other obligations of RadNet and Primedex  thereunder),  the
Purchaser shall bear and pay all fees,  costs and expenses  (including all legal
fees and expenses payable to Cooley Godward LLP) that have been incurred or that
are in the future incurred by or on behalf of the Purchaser in connection with:

               (i)   the negotiation, preparation and review of any term sheet 
or similar document relating to any of the Transactions;


                                      32

<PAGE>



               (ii) the  investigation and review conducted by the Purchaser and
its Representatives with respect to FDI's business;

               (iii) the negotiation,  preparation and review of this Agreement,
the other  Transactional  Agreements  and all  certificates,  opinions and other
instruments  and documents  delivered or to be delivered in connection  with the
Transactions; and

               (iv) the consummation and performance of the Transactions.

   11.4 Attorneys' Fees. If any legal action or other legal proceeding  relating
to any of the  Transactional  Agreements or the  enforcement of any provision of
any of the  Transactional  Agreements is brought  against any party hereto,  the
prevailing party shall be entitled to recover reasonable  attorneys' fees, costs
and disbursements (in addition to any other relief to which the prevailing party
may be entitled).

   11.5  Arbitration

         (a) Except as otherwise  provided in this Section 11.5 any controversy,
dispute or claim of any nature arising out of, in connection with or in relation
to the  interpretation,  performance or breach of this Agreement,  including any
claim based on  contract,  tort or statute,  shall be resolved at the request of
any party to this Agreement by final and binding arbitration conducted (i) by an
arbitrator ("Arbitrator") of the Judicial Arbitration & Mediation Services, Inc.
Los Angeles,  elected pursuant to the rules and regulations  thereof,  (ii) at a
location  in  Los  Angeles,   California   selected  by  the  Panel,  and  (iii)
administered  in accordance  with the  California  Arbitration  Act and the then
existing  Rules of Practice and  Procedure of Judicial  Arbitration  & Mediation
Services, Inc. The decision of the Arbitrator shall be governed by and in accord
with all  applicable  California  and  federal  laws.  Judgment  upon any  award
rendered by the  Arbitrator  may be entered by any state or federal court having
jurisdiction  thereof.  The Arbitrator  shall not be empowered to award punitive
damages. In any arbitration  proceeding,  the parties will have the rights under
section 1283.05 of the California Code of Civil Procedure.

         (b) Any party may seek from a court any interim or  provisional  relief
that may be necessary  to protect or preserve  its rights  under this  Agreement
pending the  establishment of an arbitration  proceeding under this Section 11.5
and the Arbitrator's  determination of the merits of the controversy;  provided,
however,  that the  Arbitrator  shall be  empowered  to  dissolve,  discharge or
otherwise  release  such  interim  or  provisional  relief  at any  time  before
conclusion  of  proceedings  upon a  proper  showing.  The  Arbitrator  shall be
empowered to award  monetary  damages to any party for loss  occasioned  by such
interim or provisional relief upon an ultimate showing of lack of merit.

         (c) The  Arbitrator  shall render a final award within ninety (90) days
after the date of its  appointment,  plus such  additional  time, if any, as the
Arbitrator permits for discovery pursuant to this Section 11.5

         (d) The  Arbitrator  may  award to the  prevailing  party,  if any,  as
determined by the  Arbitrator,  part or all of the prevailing  party's costs and
fees.  "Costs  and  fees"  means  all  reasonable   pre-award  expenses  of  the
arbitration,  including  the  Arbitrator's  fees,  administrative  fees,  travel
expenses,  out-of-pocket  expenses  such as  photocopy,  telecopy and  telephone
charges, witness fees and attorney's fees.

         (e)  The  award  of  the  arbitration  shall  be  final,   binding  and
nonappealable.


                                      33

<PAGE>



   11.6 Notices.  Any notice or other communication  required or permitted to be
delivered  to any party  under this  Agreement  shall be in writing and shall be
deemed  properly  delivered,  given and received  when  delivered  (by hand,  by
registered mail, by courier or express delivery service or by telecopier) to the
address or telecopier  number set forth beneath the name of such party below (or
to such other address or telecopier number as such party shall have specified in
a written notice given to the other parties hereto):

         if to FDI:

               Future Diagnostics, Inc.
               1516 Cotner Avenue
               Los Angeles, CA 90025
               Attention:  Jaana Shellock
               Telecopier: (310) 478-5810

         if to RadNet:

               RadNet Managed Imaging Services, Inc.
               1516 Cotner Avenue
               Los Angeles, CA 90025
               Attention:  Steve Hirschtick, Esq., Senior Vice President
               Telecopier: (310) 478-5810

         if to Primedex:

               Primedex Health Systems, Inc.
               1516 Cotner Avenue
               Los Angeles, CA 90025
               Attention:  Steve Hirschtick, Esq., Senior Vice President
               Telecopier: (310) 478-5810

         if to the Purchaser:

               Preferred Health Management, Inc.
               20700 Ventura Boulevard, Suite 100
               Woodland Hills, CA  91356
               Attention:   Louis W. Spidalette
               Telecopier:  (818) 227-9943

               with a copy to:

               Cooley Godward LLP
               Five Palo Alto Square
               3000 El Camino Real
               Palo Alto, CA  94306-2155
               Attention:   Michael J. Sullivan
               Telecopier:  (650) 857-0663

   11.7 Headings.  The headings  contained in this Agreement are for convenience
of reference only,  shall not be deemed to be a part of this Agreement and shall
not be referred to in connection with the construction or interpretation of this
Agreement.

   11.8  Counterparts.  This Agreement may be executed in several  counterparts,
each of  which  shall  constitute  an  original  and all of  which,  when  taken
together, shall constitute one agreement.

                                      34

<PAGE>



   11.9 Governing Law. This Agreement shall be construed in accordance with, and
governed  in all  respects  by,  the  internal  laws of the State of  California
(without giving effect to principles of conflicts of laws).

   11.10  Successors and Assigns.  This Agreement shall be binding upon: FDI and
its  successors and assigns (if any);  RadNet and Primedex and their  successors
and assigns (if any); and the Purchaser and its successors and assigns (if any).
This  Agreement  shall  inure to the  benefit of:  FDI;  RadNet;  Primedex;  the
Purchaser;  the other  Indemnitees  (subject to Section 9.9); and the respective
successors  and  assigns (if any) of the  foregoing.  The  Purchaser  may freely
assign  any  or  all  of  its  rights  under  this   Agreement   (including  its
indemnification  rights  under  Section  9),  in whole or in part,  to any other
Person without obtaining the consent or approval of any other party hereto or of
any other Person.

   11.11 Remedies Cumulative;  Specific Performance.  The rights and remedies of
the parties hereto shall be cumulative (and not alternative).  The parties agree
that in the event of any breach or  threatened  breach by any other party of any
covenant,  obligation  or  other  provision  set  forth in this  Agreement,  the
non-breaching  party shall be entitled (in addition to any other remedy that may
be available to it) to (i) a decree or order of specific performance or mandamus
to enforce the observance and performance of such covenant,  obligation or other
provision, and (ii) an injunction restraining such breach or threatened breach.

   11.12 Waiver.

         (a) No failure on the part of any Person to exercise any power,  right,
privilege or remedy under this Agreement, and no delay on the part of any Person
in exercising any power, right, privilege or remedy under this Agreement,  shall
operate as a waiver of such power, right,  privilege or remedy; and no single or
partial  exercise of any such power,  right,  privilege or remedy shall preclude
any other or further exercise thereof or of any other power, right, privilege or
remedy.

         (b) No Person  shall be deemed to have waived any claim  arising out of
this Agreement,  or any power, right,  privilege or remedy under this Agreement,
unless the waiver of such claim, power, right,  privilege or remedy is expressly
set forth in a written  instrument duly executed and delivered on behalf of such
Person; and any such waiver shall not be applicable or have any effect except in
the specific instance in which it is given.

   11.13  Amendments.  This Agreement may not be amended,  modified,  altered or
supplemented  other  than by means of a written  instrument  duly  executed  and
delivered on behalf of the Purchaser and RadNet.

   11.14 Severability. In the event that any provision of this Agreement, or the
application of any such provision to any Person or set of  circumstances,  shall
be determined to be invalid,  unlawful, void or unenforceable to any extent, the
remainder of this Agreement, and the application of such provision to Persons or
circumstances  other  than  those as to which it is  determined  to be  invalid,
unlawful, void or unenforceable, shall not be impaired or otherwise affected and
shall continue to be valid and  enforceable  to the fullest extent  permitted by
law.

   11.15  Parties in Interest.  Except for the  provisions  of Section 9 hereof,
none of the  provisions  of this  Agreement is intended to provide any rights or
remedies  to any Person  other  than the  parties  hereto  and their  respective
successors and assigns (if any).

   11.16 Entire  Agreement.  The  Transactional  Agreements set forth the entire
understanding  of  the  parties  relating  to the  subject  matter  thereof  and
supersede all prior  agreements and  understandings  among or between any of the
parties relating to the subject matter thereof.



                                      35

<PAGE>



   11.17 Construction.

         (a) For purposes of this Agreement,  whenever the context requires: the
singular number shall include the plural,  and vice versa;  the masculine gender
shall include the feminine and neuter genders; the feminine gender shall include
the  masculine  and neuter  genders;  and the neuter  gender  shall  include the
masculine and feminine genders.

         (b) The  parties  hereto  agree  that any rule of  construction  to the
effect that  ambiguities are to be resolved against the drafting party shall not
be applied in the construction or interpretation of this Agreement.

   IN WITNESS  WHEREOF,  the parties  hereto have  caused this  Agreement  to be
executed and delivered as of the date first set forth above.


PURCHASER:                       PREFERRED HEALTH MANAGEMENT, INC.



                                    By:   /s/ Louis W. Spidalette
                                          ------------------------------
                                          Louis W. Spidalette, President


FDI:                                FUTURE DIAGNOSTICS, INC.



                                    By:  /s/ Jaana Shellock
                                         -------------------------------
                                         Jaana Shellock, President
 

RADNET:                             RADNET MANAGED IMAGING SERVICES, INC.


                                    By:  /s/ Jaana Shellock
                                         -------------------------------
                                         Jaana Shellock, President


PRIMEDEX:                           PRIMEDEX HEALTH SYSTEMS, INC.


                                    By:  /s/ Howard G. Berger
                                         -------------------------------
                                         Howard G. Berger, President


                                      36

<PAGE>



                                   EXHIBIT A

                              CERTAIN DEFINITIONS


      For purposes of the Agreement (including this Exhibit A):

      Acquisition Transaction.  "Acquisition Transaction" shall mean any
transaction involving:

            (a) the sale or other  disposition  of all or any  portion  of FDI's
business or assets (other than in the Ordinary Course of Business);

            (b) the issuance, sale or other disposition of (i) any capital stock
of FDI,  (ii) any option,  call,  warrant or right  (whether or not  immediately
exercisable)  to  acquire  any  capital  stock of FDI,  or (iii)  any  security,
instrument or obligation that is or may become  convertible into or exchangeable
for any capital stock of FDI; or

            (c) any merger, consolidation, business combination, share exchange,
reorganization  or similar  transaction  involving FDI, other than a transaction
contemplated pursuant to the terms of this Agreement.

      Agreement.  "Agreement" shall mean the Stock Purchase Agreement to which
this Exhibit A is attached (including the Disclosure Schedule), as it may be 
amended from time to time.

      Best Efforts.  "Best Efforts" shall mean the efforts that a prudent Person
desiring to achieve a particular result would use in order to ensure that such 
result is achieved as expeditiously as possible.

      CERCLA.  "CERCLA" shall mean the Comprehensive Environmental Response,
Compensation and Liability Act.

      Closing.  "Closing" shall have the meaning specified in Section 1.3(a) of 
the Agreement.

      Closing Date.  "Closing Date" shall have the meaning specified in Section 
1.3(a) of the Agreement.

      Code.  "Code" shall mean the Internal Revenue Code of 1986, as amended.

      Companies.  "Companies" shall mean FDI, RadNet and Primedex.

      Company Plan.  "Company Plan" shall mean any Current Benefit Plan or 
Past Benefit Plan.

      Comparable Entities.  "Comparable Entities" shall mean Entities 
(other than FDI) that are engaged in businesses similar to FDI's business.

      Consent.  "Consent" shall mean any approval, consent, ratification, 
permission, waiver or authorization (including any Governmental Authorization).

      Contract.  "Contract" shall mean any written or oral agreement,  contract,
understanding,    arrangement,    instrument,    note,   guaranty,    indemnity,
representation,  warranty,  deed,  assignment,  power of attorney,  certificate,
purchase  order,  work  order,   insurance  policy,  benefit  plan,  commitment,
covenant, assurance or undertaking of any nature.


                                     A-1

<PAGE>



      Current Benefit Plan.  "Current Benefit Plan" shall mean any Employee
 Benefit Plan that is currently in effect and:

                  (a)   that was established or adopted by any of the Companies
 or any ERISA Affiliate or is maintained or sponsored by FDI;

                  (b)   in which FDI participates;

                  (c) with respect to which FDI or any ERISA Affiliate is or may
      be required or permitted to make any contribution; or

                  (d) with respect to which FDI or any ERISA Affiliate is or may
      become subject to any Liability.

      Damages.  "Damages"  shall include any loss,  damage,  injury,  decline in
value, Liability,  claim, demand,  settlement,  judgment,  award, fine, penalty,
Tax, fee (including any legal fee, expert fee,  accounting fee or advisory fee),
charge, cost (including any cost of investigation) or expense of any nature.

      Disclosure Schedule.  "Disclosure Schedule" shall mean the schedule
(dated as of the date of the Agreement) delivered to the Purchaser on behalf of 
the Companies, a copy of which is attached to the Agreement and incorporated in 
the Agreement by reference.

      Employee Liabilities.  "Employee Liabilities" shall have the meaning 
specified in Section 1.4 of the Agreement.

      Employee Benefit Plan.  "Employee Benefit Plan" shall have the meaning 
specified in Section 3(3) of ERISA.

      Encumbrance.  "Encumbrance"  shall mean any lien,  pledge,  hypothecation,
charge,  mortgage,  security interest,  encumbrance,  equity,  trust,  equitable
interest,  claim,  preference,  right of possession,  lease,  tenancy,  license,
encroachment, covenant, infringement,  interference, Order, proxy, option, right
of first refusal, preemptive right, community property interest, legend, defect,
impediment,  exception,  reservation,  limitation,  impairment,  imperfection of
title,  condition or restriction of any nature (including any restriction on the
voting of any security, any restriction on the transfer of any security or other
asset,  any restriction on the receipt of any income derived from any asset, any
restriction  on the use of any  asset  and any  restriction  on the  possession,
exercise or transfer of any other attribute of ownership of any asset).

      Entity.  "Entity"  shall mean any  corporation  (including  any non-profit
corporation),   general  partnership,  limited  partnership,  limited  liability
partnership,  joint venture, estate, trust,  cooperative,  foundation,  society,
political party,  union,  company  (including any limited  liability  company or
joint stock company),  firm or other  enterprise,  association,  organization or
entity.

  erISA. "ERISA" shall mean the Employee Retirement Income Security Act of 1974.

      ERISA Affiliate.  "ERISA  Affiliate" shall mean any Person that is, was or
would be treated as a single  employer with any of the  Companies  under Section
414 of the Code.

      Excluded Assets. "Excluded Assets" shall mean (i) all of FDI's proprietary
computer  software,  including but not limited to the operating  system software
for the MSO and RMSO systems;  (ii) certain equipment which is listed in Exhibit
L to this Agreement;  (iii) the Retrospective  Coding Outcomes Database and (iv)
the Clinical Precertification Review Guidelines Database.


                                     A-2

<PAGE>



      Excluded Contract.  "Excluded Contract" shall mean any FDI Contract that:

                  (a)   FDI has entered into in the Ordinary Course of Business;

                  (b)  is  identical  in  all  material  respects  to one of the
Standard Form Agreements;

                  (c) has a term of less  than 90 days or may be  terminated  by
      FDI (without  penalty)  within 90 days after the delivery of a termination
      notice by FDI; and

                  (d) does not  contemplate  or involve  the  payment of cash or
      other consideration in an amount or having a value in excess of $10,000.

      Excluded  Liabilities.  "Excluded  Liabilities"  shall  mean  all  of  the
Liabilities  of FDI of every  kind  and  nature  whatsoever,  except  for  those
liabilities  specifically  identified as liabilities to be retained by FDI after
the Closing in the  Assignment  and  Assumption  Agreement of even date herewith
among the parties to this Agreement. Excluded Liabilities shall include, without
limitation,  (i) all  liabilities  associated with the employees of FDI prior to
the  Closing  except  for the  Employee  Liabilities  and (ii)  all  liabilities
associated with Matthew Iwamoto, M.D. v. Woodward Park Imaging, Inc. et al. (the
"Iwamoto Litigation"). Primedex shall continue to be able to control the defense
of the Iwamoto  Litigation  unless the Purchaser  shall  determine in good faith
that a conflict of interest  exists that makes the joint  representation  of all
parties  improper,  in which case the  Purchaser  may retain its own  counsel at
Primedex's expense.

      FDI.  "FDI" shall mean Future Diagnostics, Inc., a California corporation.

      FDI Contract.  "FDI Contract" shall mean any Contract:

                  (a)   to which FDI is a party;

                  (b) by which FDI or any of its assets is or may  become  bound
      or under which FDI has, or may become subject to, any obligation; or

      (c) under which FDI has or may acquire any right or interest.

      FDI Financial Statements.  "FDI Financial Statements" shall have the 
meaning specified in Section 2.4(a) of the Agreement.

      FDI Returns.  "FDI Returns" shall have the meaning specified in 
Section 2.16(b) of the Agreement.

      GAAP.  "GAAP" shall mean generally accepted accounting principles, 
applied on a basis consistent with the basis on which the FDI Financial 
Statements were prepared.

      Governmental Authorization.  "Governmental Authorization" shall mean any:

                  (a)  permit,  license,  certificate,   franchise,  concession,
      approval,  consent,  ratification,  permission,  clearance,  confirmation,
      endorsement,  waiver,  certification,  designation,  rating, registration,
      qualification or  authorization  that is, has been or may in the future be
      issued,  granted,  given or  otherwise  made  available  by or  under  the
      authority of any Governmental  Body or pursuant to any Legal  Requirement;
      or

                  (b) right under any Contract with any Governmental Body.

      Governmental Body.  "Governmental Body" shall mean any:

                                     A-3

<PAGE>



                  (a)  nation,  principality,  state,  commonwealth,   province,
      territory,  county,  municipality,  district or other  jurisdiction of any
      nature;

            (b) federal, state, local, municipal, foreign or other government;

                  (c) governmental or quasi-governmental authority of any nature
      (including any governmental  division,  subdivision,  department,  agency,
      bureau,  branch,  office,  commission,  council,  board,  instrumentality,
      officer, official, representative,  organization, unit, body or Entity and
      any court or other tribunal);

                  (d)   multi-national organization or body; or

                  (e)  individual,  Entity or body  exercising,  or  entitled to
      exercise,   any   executive,   legislative,    judicial,   administrative,
      regulatory, police, military or taxing authority or power of any nature.

      Hazardous Material.  "Hazardous Material" shall include:

                  (a) any  petroleum,  waste  oil,  crude  oil,  asbestos,  urea
      formaldehyde or polychlorinated biphenyl;

                  (b) any waste,  gas or other  substance  or  material  that is
explosive or radioactive;

                  (c) any  "hazardous  substance,"  "pollutant,"  "contaminant,"
      "hazardous waste," "regulated  substance,"  "hazardous chemical" or "toxic
      chemical"  as  designated,  listed or  defined  (whether  expressly  or by
      reference)  in  any  statute,   regulation  or  other  Legal   Requirement
      (including CERCLA, any other so-called "superfund" or "superlien" law, the
      Resource  Conservation  Recovery Act, the Federal Water Pollution  Control
      Act,  the  Toxic  Substances  Control  Act,  the  Emergency  Planning  and
      Community  Right-to-Know  Act and the respective  regulations  promulgated
      thereunder);

                  (d) any other  substance or material  (regardless  of physical
      form) or form of energy  that is  subject to any Legal  Requirement  which
      regulates or establishes standards of conduct in connection with, or which
      otherwise  relates to, the protection of human health,  plant life, animal
      life,  natural  resources,  property or the  enjoyment of life or property
      from the presence in the  environment  of any solid,  liquid,  gas,  odor,
      noise or form of energy; and

                  (e)  any  compound,   mixture,   solution,  product  or  other
      substance or material that contains any substance or material  referred to
      in clause "(a)," "(b)," "(c)" or "(d)" above.

      Indemnitees.  "Indemnitees" shall mean the following Persons:

                  (a)   the Purchaser;

                  (b) the Purchaser's  current and future affiliates  (including
FDI);

                  (c) the respective  Representatives of the Persons referred to
      in clauses "(a)" and "(b)" above; and

                  (d) the  respective  successors  and  assigns  of the  Persons
      referred to in clauses "(a)," "(b)" and "(c)" above;

provided,  however,  that FDI shall not be entitled to exercise any rights as an
Indemnitee prior to the Closing.

                                     A-4

<PAGE>




      Knowledge.  An  individual  shall  be  deemed  to  have  "Knowledge"  of a
particular  fact or other matter if such  individual  is actually  aware of such
fact or other matter.

FDI shall be deemed to have  "Knowledge" of a particular fact or other matter if
any  officer,  or senior  employee  of FDI has  Knowledge  of such fact or other
matter.

      Legal  Requirement.  "Legal  Requirement"  shall mean any federal,  state,
local,  municipal,  foreign or other law,  statute,  legislation,  constitution,
principle  of  common  law,   resolution,   ordinance,   code,  edict,   decree,
proclamation,   treaty,   convention,   rule,  regulation,   ruling,  directive,
pronouncement,  requirement, specification,  determination, decision, opinion or
interpretation that is or has been issued, enacted,  adopted,  passed, approved,
promulgated,  made, implemented or otherwise put into effect by any Governmental
Body.

      Liability.  "Liability" shall mean any debt, obligation, duty or liability
of any nature  (including any  undisclosed,  unmatured,  unaccrued,  contingent,
indirect,  conditional,   implied,  vicarious,  derivative,  joint,  several  or
secondary  liability),  regardless  of whether  such debt,  obligation,  duty or
liability  would be  required to be  disclosed  on a balance  sheet  prepared in
accordance  with  generally  accepted  accounting  principles  and regardless of
whether such debt, obligation, duty or liability is immediately due and payable.

      Licensed Assets.  "Licensed Assets" shall mean the intellectual property 
licensed by RadNet to Purchaser and FDI in accordance with the 
License Agreement.

      Net Provider Site Obligations.  "Net Provider Site Obligations" shall mean
(i) the  aggregate  value of FDI's  obligations  under its  imaging  center  and
medical service provider contracts on the books and records of the Company as of
the close of business on September 3, 1997,  minus (ii) the  aggregate  value of
FDI's accounts receivable as of September 3, 1997.

      Order.  "Order" shall mean any:

                  (a)  order,  judgment,   injunction,  edict,  decree,  ruling,
      pronouncement,   determination,   decision,  opinion,  verdict,  sentence,
      subpoena,  writ  or  award  that is or has  been  issued,  made,  entered,
      rendered or  otherwise  put into effect by or under the  authority  of any
      court,  administrative agency or other Governmental Body or any arbitrator
      or  arbitration  panel to which FDI is a party or by which  the  Companies
      know (or should know) that FDI is bound; or

                  (b) Contract  with any  Governmental  Body that is or has been
      entered into in connection with any Proceeding.

      Ordinary Course of Business.  An action taken by or on behalf of FDI shall
not be deemed to have been taken in the "Ordinary Course of Business" unless:

                  (a) such action is recurring  in nature,  is  consistent  with
      FDI's past  practices and is taken in the ordinary  course of FDI's normal
      day-to-day operations;

                  (b) such action is taken in accordance  with sound and prudent
      business practices as reasonably determined by FDI;

                  (c) such  action is not  required  to be  authorized  by FDI's
      stockholders,  FDI's board of directors or any committee of FDI's board of
      directors and does not require any other separate or special authorization
      of any nature; and


                                     A-5

<PAGE>



                  (d) such action is similar in nature and  magnitude to actions
      customarily taken, without any separate or special  authorization,  in the
      ordinary course of the normal day-to-day operations of other Entities that
      are engaged in businesses similar to FDI's business.

      Parent Companies.  "Parent Companies" shall mean RadNet and Primedex.

      Past Benefit Plan.  "Past Benefit Plan" shall mean any Employee Benefit 
Plan (other than a Current Benefit Plan):

                  (a) of which any of the  Companies or any ERISA  Affiliate has
      ever been a "plan  sponsor"  (as defined in Section  3(16)(B) of ERISA) or
      that otherwise has at any time been  established,  adopted,  maintained or
      sponsored by any of the Companies or by any ERISA Affiliate;

                  (b) in which any of the  Companies or any ERISA  Affiliate has
ever participated;

                  (c) with  respect to which any of the  Companies  or any ERISA
      Affiliate  has ever made,  or has ever been required or permitted to make,
      any contribution; or

                  (d) with  respect to which any of the  Companies  or any ERISA
      Affiliate has ever been subject to any Liability.

      Person.  "Person" shall mean any individual, Entity or Governmental Body.

      Pre-Closing Period.  "Pre-Closing Period" shall mean the period 
commencing as of the date of the Agreement and ending on the Closing Date.

      Primedex Indemnitees."Primedex Indemnitees" shall mean the following 
Persons:

                  (a)   Primedex and RadNet;

                  (b) The current and future  affiliates  of Primedex and RadNet
(excluding FDI);

                  (c) the respective  Representatives of the Persons referred to
      in clauses "(a)" and "(b)" above; and

                  (d) the  respective  successors  and  assigns  of the  Persons
      referred to in clauses "(a)," "(b)" and "(c)" above.

      Primedex.  "Primedex" shall mean Primedex Health Systems, Inc., a New 
York corporation.

      Proceeding.   "Proceeding"  shall  mean  any  action,  suit,   litigation,
arbitration,   proceeding  (including  any  civil,   criminal,   administrative,
investigative or appellate proceeding and any informal proceeding), prosecution,
contest,  hearing, inquiry, inquest, audit, examination or investigation that is
commenced,  brought,  conducted  or heard by or before,  or that  involves,  any
Governmental Body or any arbitrator or arbitration panel.

      Proprietary  Asset.  "Proprietary  Asset"  shall mean any  patent,  patent
application,  trademark  (whether  registered or unregistered and whether or not
relating to a published work),  trademark  application,  trade name,  fictitious
business name, service mark (whether  registered or unregistered),  service mark
application,   copyright   (whether   registered  or  unregistered),   copyright
application,  maskwork, maskwork application, trade secret, know-how, franchise,
system, computer software,  invention,  design, blueprint,  proprietary product,
technology, proprietary right or other intellectual property right or intangible
asset.

                                     A-6

<PAGE>




      Purchase Price.  "Purchase Price" shall have the meaning specified in 
Section 1.2 of the Agreement.

      Purchaser.  "Purchaser" shall mean Preferred Health Management, 
Inc., a Delaware corporation.

      Purchaser's Disclosure Schedule.  "Purchaser's  Disclosure Schedule" shall
mean the  schedule  (dated as of the date of this  Agreement)  delivered  to the
Companies on behalf of Purchaser,  a copy of which is attached to this Agreement
and incorporated into this Agreement by reference.

      RadNet.  "RadNet" shall mean RadNet Managed Imaging Services, Inc., a 
California corporation.

      Related Party.  Each of the following shall be deemed to be a
 "Related Party":

                  (e)   RadNet;

            (f)   Primedex;

                  (g) each  individual  who is, or who has at any time been,  an
      officer of FDI or of any of the Parent Companies;

                  (h)  each  member  of the  family  of each of the  individuals
      referred to in clauses "(a)" and "(b)" above; and

                  (i)  any  Entity  (other  than  FDI) in  which  any one of the
      individuals  referred to in clauses "(a)," "(b)" and "(c)" above holds (or
      in  which  more  than  one  of  such   individuals   collectively   hold),
      beneficially  or  otherwise,  a  material  voting,  proprietary  or equity
      interest.

      Representatives.  "Representatives" shall mean officers, directors, 
employees, agents, attorneys, accountants, advisors and representatives.  
RadNet and Primedex and all other Related Parties shall be deemed to be
 "Representatives" of FDI.

      Shares.  "Shares" shall have the meaning specified in the Recitals to 
the Agreement.

  Standard Form Agreements.  "Standard Form Agreements" shall mean the forms of
agreements attached as Appendices 2.12 to the Disclosure Schedule.

      Tax. "Tax" shall mean any tax  (including  any income tax,  franchise tax,
capital gains tax,  estimated tax, gross receipts tax,  value-added tax, surtax,
excise  tax,  ad valorem  tax,  transfer  tax,  stamp tax,  sales tax,  use tax,
property tax,  business tax,  occupation  tax,  inventory  tax,  occupancy  tax,
withholding tax or payroll tax), levy, assessment,  tariff, impost,  imposition,
toll,  duty  (including  any customs  duty),  deficiency or fee, and any related
charge or amount (including any fine, penalty or interest), that is, has been or
may in the  future  be (a)  imposed,  assessed  or  collected  by or  under  the
authority of any  Governmental  Body, or (b) payable pursuant to any tax-sharing
agreement or similar Contract.

      Tax Return.  "Tax Return" shall mean any return (including any information
return),   report,   statement,   declaration,   estimate,   schedule,   notice,
notification,  form, election, certificate or other document or information that
is, has been or may in the future be filed with or submitted  to, or required to
be filed with or submitted  to, any  Governmental  Body in  connection  with the
determination,  assessment,  collection  or payment of any Tax or in  connection
with the administration, implementation or enforcement of or compliance with any
Legal Requirement relating to any Tax.

                                     A-7

<PAGE>



      Transactional Agreements.  "Transactional Agreements" shall mean:

                  (a)   the Agreement;

                  (b)   the Note; and

                  (c)  the  sublease,   noncompetition  agreements  and  license
      agreement  referred  to in  Sections  6.9,  6.10,  6.11  and  7.4  and the
      Assignment and Assumption  Agreement among the Purchaser and the Companies
      of even date herewith.

      Transactions.  "Transactions" shall mean (a) the execution and delivery 
of the respective Transactional Agreements, and (b) all of the transactions 
contemplated by the respective Transactional Agreements, including:

                  (i)   the sale of the Shares by RadNet to the Purchaser in
 accordance with the Agreement;

                  (ii) the assumption of  obligations by the Purchaser  pursuant
      so Sections 1.2(a)(ii) and 1.2(a)(iii);

                  (iii) the execution and delivery of the Note by the Purchaser;
                                 and

                  (iv) the  performance  by the  Companies  and the Purchaser of
      their respective  obligations under the  Transactional  Agreements and the
      exercise by the  Companies and the  Purchaser of their  respective  rights
      under the Transactional Agreements.

      Unaudited Interim Balance Sheet. "Unaudited Interim Balance Sheet" shall
 have the meaning specified in Section 2.4(a)(iii) of the Agreement.


                                     A-8


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