Exhibit 10.27

                                PLEDGE AGREEMENT
                                ----------------

          This PLEDGE AGREEMENT, dated as of November 15, 2006 (together with
all amendments, if any, from time to time hereto, this "AGREEMENT") by and among
the Pledgors identified as such on the signature pages hereof (each a "PLEDGOR"
and collectively, the "PLEDGORS") and GENERAL ELECTRIC CAPITAL CORPORATION in
its capacity as Agent for Lenders ("AGENT").

                              W I T N E S S E T H:

          WHEREAS, pursuant to that certain Credit Agreement dated as of the
date hereof by and among RadNet Management, Inc. ("BORROWER"), the other Persons
named therein as Credit Parties, Agent and the Persons signatory thereto from
time to time as Lenders (including all annexes, exhibits and schedules thereto,
and as from time to time amended, restated, supplemented or otherwise modified
(the "CREDIT AGREEMENT") the Lenders have agreed to make Loans to, and incur
Letter of Credit Obligations for the benefit of, Borrower;

          WHEREAS, each Pledgor legally and beneficially owns the shares of
capital stock of each company listed on Part A of SCHEDULE I hereto and is the
owner of the promissory notes and instruments held by such Pledgor listed in
Part B of SCHEDULE I hereto;

          WHEREAS, each Pledgor benefits from the credit facilities made
available to Borrower under the Credit Agreement;

          WHEREAS, in order to induce Agent and Lenders to make the Loans and to
incur the Letter of Credit Obligations as provided for in the Credit Agreement,
each Pledgor has agreed to pledge the Pledged Collateral to Agent in accordance
herewith;

          NOW, THEREFORE, in consideration of the premises and the covenants
hereinafter contained and to induce Lenders to make Loans and to incur Letter of
Credit Obligations under the Credit Agreement, it is agreed as follows:

     1. DEFINITIONS. Unless otherwise defined herein, terms defined in the
Credit Agreement are used herein as therein defined, and the following shall
have (unless otherwise provided elsewhere in this Agreement) the following
respective meanings (such meanings being equally applicable to both the singular
and plural form of the terms defined):

          "BANKRUPTCY CODE" means title 11, United States Code, as amended from
time to time, and any successor statute thereto.

          "PLEDGED COLLATERAL" has the meaning assigned to such term in SECTION
2 hereof.

          "PLEDGED ENTITY" means an issuer of Pledged Shares or Pledged
Indebtedness.

          "PLEDGED INDEBTEDNESS" means the Indebtedness evidenced by promissory
notes and instruments listed on Part B of SCHEDULE I hereto;

          "PLEDGED SHARES" means those shares listed on Part A of SCHEDULE I
hereto.

          "SECURED OBLIGATIONS" has the meaning assigned to such term in SECTION
3 hereof.

     2. PLEDGE. Each Pledgor hereby pledges to Agent, and grants to Agent for
itself and the benefit of Lenders, a first priority security interest in all of
the following (collectively, the "PLEDGED COLLATERAL"):

          (a) the Pledged Shares and the certificates representing the Pledged
     Shares, and all dividends, distributions, cash, instruments and other
     property or proceeds from time to time received, receivable or otherwise
     distributed in respect of or in exchange for any or all of the Pledged
     Shares; and

          (b) such portion, as determined by Agent as provided in SECTION 6(D)
     below, of any additional shares of stock of a Pledged Entity from time to
     time acquired by such Pledgor in any manner (which shares shall be deemed
     to be part of the Pledged Shares), and the certificates representing such
     additional shares, and all dividends, distributions, cash, instruments and
     other property or proceeds from time to time received, receivable or
     otherwise distributed in respect of or in exchange for any or all of such
     Stock; and

          (c) the Pledged Indebtedness and the promissory notes or instruments
     evidencing the Pledged Indebtedness, and all interest, cash, instruments
     and other property and assets from time to time received, receivable or
     otherwise distributed in respect of the Pledged Indebtedness; and

          (d) all additional Indebtedness arising after the date hereof and
     owing to such Pledgor and evidenced by promissory notes or other
     instruments, together with such promissory notes and instruments, and all
     interest, cash, instruments and other property and assets from time to time
     received, receivable or otherwise distributed in respect of that Pledged
     Indebtedness.

     3. SECURITY FOR OBLIGATIONS. This Agreement secures, and the Pledged
Collateral is security for, the prompt payment in full when due, whether at
stated maturity, by acceleration or otherwise, and performance of all
Obligations of any kind under or in connection with the Credit Agreement and the
other Loan Documents and all obligations of each Pledgor now or hereafter
existing under this Agreement including, without limitation, all fees, costs and
expenses whether in connection with collection actions hereunder or otherwise
(collectively, the "SECURED OBLIGATIONS").

     4. DELIVERY OF PLEDGED COLLATERAL. All certificates and all promissory
notes and instruments evidencing the Pledged Collateral shall be delivered to
and held by or on behalf of Agent, for itself and the benefit of Lenders,
pursuant hereto. All Pledged Shares shall be accompanied by duly executed
instruments of transfer or assignment in blank, all in form and substance
satisfactory to Agent and all promissory notes or other instruments evidencing
the Pledged Indebtedness shall be endorsed by each Pledgor.

     5. REPRESENTATIONS AND WARRANTIES. Each Pledgor represents and warrants to
Agent that:


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          (a) Such Pledgor is, and at the time of delivery of the Pledged Shares
     to Agent will be, the sole holder of record and the sole beneficial owner
     of such Pledged Collateral pledged by such Pledgor free and clear of any
     Lien thereon or affecting the title thereto, except for any Lien created by
     this Agreement and the Lien granted pursuant to the Second Lien Credit
     Agreement; such Pledgor is and at the time of delivery of the Pledged
     Indebtedness to Agent will be, the sole owner of such Pledged Collateral
     free and clear of any Lien thereon or affecting title thereto, except for
     any Lien created by this Agreement and the Lien granted pursuant to the
     Second Lien Credit Agreement;

          (b) All of the Pledged Shares have been duly authorized, validly
     issued and are fully paid and non-assessable; the Pledged Indebtedness has
     been duly authorized, authenticated or issued and delivered by, and is the
     legal, valid and binding obligations of, the Pledged Entities, and no such
     Pledged Entity is in default thereunder;

          (c) Such Pledgor has the right and requisite authority to pledge,
     assign, transfer, deliver, deposit and set over the Pledged Collateral
     pledged by such Pledgor to Agent as provided herein;

          (d) None of the Pledged Shares or Pledged Indebtedness has been issued
     or transferred in violation of the securities registration, securities
     disclosure or similar laws of any jurisdiction to which such issuance or
     transfer may be subject;

          (e) All of the Pledged Shares are presently owned by such Pledgor, and
     are presently represented by the certificates listed on Part A of SCHEDULE
     I hereto. As of the date hereof, there are no existing options, warrants,
     calls or commitments of any character whatsoever relating to the Pledged
     Shares;

          (f) No consent, approval, authorization or other order or other action
     by, and no notice to or filing with, any Governmental Authority or any
     other Person is required (i) for the pledge by such Pledgor of the Pledged
     Collateral pursuant to this Agreement or for the execution, delivery or
     performance of this Agreement by such Pledgor, or (ii) for the exercise by
     Agent of the voting or other rights provided for in this Agreement or the
     remedies in respect of the Pledged Collateral pursuant to this Agreement,
     except as may be required in connection with such disposition by laws
     affecting the offering and sale of securities generally;

          (g) The pledge, assignment and delivery of the Pledged Collateral
     pursuant to this Agreement will create a valid first priority Lien on and a
     first priority perfected security interest in favor of the Agent for the
     benefit of Agent and Lenders in the Pledged Collateral and the proceeds
     thereof, securing the payment of the Secured Obligations, subject to no
     other Lien;

          (h) This Agreement has been duly authorized, executed and delivered by
     such Pledgor and constitutes a legal, valid and binding obligation of such
     Pledgor enforceable against such Pledgor in accordance with its terms;

          (i) The Pledged Shares constitute 100% of the issued and outstanding
     shares of Stock of each Pledged Entity; and


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          (j) Except as disclosed on Part B of SCHEDULE I, none of the Pledged
     Indebtedness is subordinated in right of payment to other Indebtedness
     (except for the Secured Obligations) or subject to the terms of an
     indenture.

          (k) Any interests held by any Pledgor in any partnership or limited
     liability company (i) are not dealt in or traded on securities exchanges or
     in securities markets, (ii) are not "investment company securities" (as
     defined in Section 8-103(b) of the Uniform Commercial Code) and (iii) do
     not provide, in the related partnership or membership agreements,
     certificates, if any, representing such interest or otherwise, that they
     are securities governed by the Uniform Commercial Code of any jurisdiction.

          (l) Without the prior express written consent of the Agent, each
     Pledgor will not agree to any election by any partnership or limited
     liability company in which such Pledgor has an interest to treat such
     interest as securities governed by the Uniform Commercial Code of any
     jurisdiction an in any event will promptly notify the Agent in writing if
     the representation set forth in SECTION 5(K) hereof becomes untrue for any
     reason and, in such event, take such action as the Agent may request in
     order to establish the Agent's "control" (within the meaning of Section
     8-106 of the Uniform Commercial Code) over such interest.

          The representations and warranties set forth in this SECTION 5 shall
survive the execution and delivery of this Agreement.

     6. COVENANTS. Each Pledgor covenants and agrees that until the Termination
Date:

          (a) Without the prior written consent of Agent, such Pledgor will not
     sell, assign, transfer, pledge, or otherwise encumber any of its rights in
     or to the Pledged Collateral, or any unpaid dividends, interest or other
     distributions or payments with respect to the Pledged Collateral or grant a
     Lien in the Pledged Collateral, unless otherwise expressly permitted by the
     Credit Agreement;

          (b) Such Pledgor will, at its expense, promptly execute, acknowledge
     and deliver all such instruments and take all such actions as Agent from
     time to time may request in order to ensure to Agent and Lenders the
     benefits of the Liens in and to the Pledged Collateral intended to be
     created by this Agreement, including the filing of any necessary Code
     financing statements, which may be filed by Agent with or (to the extent
     permitted by law) without the signature of such Pledgor, and will cooperate
     with Agent, at such Pledgor's expense, in obtaining all necessary approvals
     and making all necessary filings under federal, state, local or foreign law
     in connection with such Liens or any sale or transfer of the Pledged
     Collateral;

          (c) Such Pledgor has and will defend the title to the Pledged
     Collateral and the Liens of Agent in the Pledged Collateral against the
     claim of any Person and will maintain and preserve such Liens; and

          (d) Such Pledgor will, upon obtaining ownership of any additional
     Stock or promissory notes or instruments of a Pledged Entity or Stock or
     promissory notes or instruments otherwise required to be pledged to Agent
     pursuant to any of the Loan Documents, which Stock, notes or instruments


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     are not already Pledged Collateral, promptly (and in any event within three
     (3) Business Days) deliver to Agent a Pledge Amendment, duly executed by
     such Pledgor, in substantially the form of SCHEDULE II hereto (a "PLEDGE
     AMENDMENT") in respect of any such additional Stock, notes or instruments,
     pursuant to which such Pledgor shall pledge to Agent all of such additional
     Stock, notes and instruments. Such Pledgor hereby authorizes Agent to
     attach each Pledge Amendment to this Agreement and agrees that all Pledged
     Shares and Pledged Indebtedness listed on any Pledge Amendment delivered to
     Agent shall for all purposes hereunder be considered Pledged Collateral.

     7. PLEDGORS' RIGHTS. As long as no Default or Event of Default shall have
occurred and be continuing and until written notice shall be given to each
Pledgor in accordance with SECTION 8(A) hereof:

          (a) Each Pledgor shall have the right, from time to time, to vote and
     give consents with respect to the Pledged Collateral, or any part thereof
     for all purposes not inconsistent with the provisions of this Agreement,
     the Credit Agreement or any other Loan Document; PROVIDED, HOWEVER, that no
     vote shall be cast, and no consent shall be given or action taken, which
     would have the effect of impairing the position or interest of Agent in
     respect of the Pledged Collateral or which would authorize, effect or
     consent to (unless and to the extent expressly permitted by the Credit
     Agreement):

               (i) the dissolution or liquidation, in whole or in part, of a
          Pledged Entity;

               (ii) the consolidation or merger of a Pledged Entity with any
          other Person;

               (iii) the sale, disposition or encumbrance of all or
          substantially all of the assets of a Pledged Entity, except for Liens
          in favor of Agent;

               (iv) any change in the authorized number of shares, the stated
          capital or the authorized share capital of a Pledged Entity or the
          issuance of any additional shares of its Stock; or

               (v) the alteration of the voting rights with respect to the Stock
          of a Pledged Entity; and

          (b) (i) Each Pledgor shall be entitled, from time to time, to collect
     and receive for its own use all cash dividends and interest paid in respect
     of the Pledged Shares and Pledged Indebtedness to the extent not in
     violation of the Credit Agreement OTHER THAN any and all: (A) dividends and
     interest paid or payable other than in cash in respect of any Pledged
     Collateral, and instruments and other property received, receivable or
     otherwise distributed in respect of, or in exchange for, any Pledged
     Collateral; (B) dividends and other distributions paid or payable in cash
     in respect of any Pledged Shares in connection with a partial or total
     liquidation or dissolution or in connection with a reduction of capital,
     capital surplus or paid-in capital of a Pledged Entity; and (C) cash paid,
     payable or otherwise distributed, in respect of principal of, or in
     redemption of, or in exchange for, any Pledged Collateral; PROVIDED,
     HOWEVER, that until actually paid all rights to such distributions shall
     remain subject to the Lien created by this Agreement; and


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               (ii) all dividends and interest (other than such cash dividends
          and interest as are permitted to be paid to Pledgors in accordance
          with CLAUSE (I) above) and all other distributions in respect of any
          of the Pledged Shares or Pledged Indebtedness, whenever paid or made,
          shall be delivered to Agent to hold as Pledged Collateral and shall,
          if received by any Pledgor, be received in trust for the benefit of
          Agent, be segregated from the other property or funds of such Pledgor,
          and be forthwith delivered to Agent as Pledged Collateral in the same
          form as so received (with any necessary indorsement).

     8. DEFAULTS AND REMEDIES; PROXY.

          (a) Upon the occurrence of an Event of Default and during the
     continuation of such Event of Default, and concurrently with written notice
     to each Pledgor, Agent (personally or through an agent) is hereby
     authorized and empowered to transfer and register in its name or in the
     name of its nominee the whole or any part of the Pledged Collateral, to
     exchange certificates or instruments representing or evidencing Pledged
     Collateral for certificates or instruments of smaller or larger
     denominations, to exercise the voting and all other rights as a holder with
     respect thereto, to collect and receive all cash dividends, interest,
     principal and other distributions made thereon, to sell in one or more
     sales after ten (10) days' notice of the time and place of any public sale
     or of the time at which a private sale is to take place (which notice each
     Pledgor agrees is commercially reasonable) the whole or any part of the
     Pledged Collateral and to otherwise act with respect to the Pledged
     Collateral as though Agent was the outright owner thereof. Any sale shall
     be made at a public or private sale at Agent's place of business, or at any
     place to be named in the notice of sale, either for cash or upon credit or
     for future delivery at such price as Agent may deem fair, and Agent may be
     the purchaser of the whole or any part of the Pledged Collateral so sold
     and hold the same thereafter in its own right free from any claim of any
     Pledgor or any right of redemption. Each sale shall be made to the highest
     bidder, but Agent reserves the right to reject any and all bids at such
     sale which, in its discretion, it shall deem inadequate. Demands of
     performance, except as otherwise herein specifically provided for, notices
     of sale, advertisements and the presence of property at sale are hereby
     waived and any sale hereunder may be conducted by an auctioneer or any
     officer or agent of Agent. EACH PLEDGOR HEREBY IRREVOCABLY CONSTITUTES AND
     APPOINTS AGENT AS THE PROXY AND ATTORNEY-IN-FACT OF SUCH PLEDGOR WITH
     RESPECT TO THE PLEDGED COLLATERAL, INCLUDING THE RIGHT TO VOTE THE PLEDGED
     SHARES, WITH FULL POWER OF SUBSTITUTION TO DO SO. THE APPOINTMENT OF AGENT
     AS PROXY AND ATTORNEY-IN-FACT IS COUPLED WITH AN INTEREST AND SHALL BE
     IRREVOCABLE UNTIL THE TERMINATION DATE. IN ADDITION TO THE RIGHT TO VOTE
     THE PLEDGED SHARES, THE APPOINTMENT OF AGENT AS PROXY AND ATTORNEY-IN-FACT
     SHALL INCLUDE THE RIGHT TO EXERCISE ALL OTHER RIGHTS, POWERS, PRIVILEGES
     AND REMEDIES TO WHICH A HOLDER OF THE PLEDGED SHARES WOULD BE ENTITLED
     (INCLUDING GIVING OR WITHHOLDING WRITTEN CONSENTS OF SHAREHOLDERS, CALLING


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     SPECIAL MEETINGS OF SHAREHOLDERS AND VOTING AT SUCH MEETINGS). SUCH PROXY
     SHALL BE EFFECTIVE, AUTOMATICALLY AND WITHOUT THE NECESSITY OF ANY ACTION
     (INCLUDING ANY TRANSFER OF ANY PLEDGED SHARES ON THE RECORD BOOKS OF THE
     ISSUER THEREOF) BY ANY PERSON (INCLUDING THE ISSUER OF THE PLEDGED SHARES
     OR ANY OFFICER OR AGENT THEREOF), UPON THE OCCURRENCE OF AN EVENT OF
     DEFAULT. NOTWITHSTANDING THE FOREGOING, AGENT SHALL NOT HAVE ANY DUTY TO
     EXERCISE ANY SUCH RIGHT OR TO PRESERVE THE SAME AND SHALL NOT BE LIABLE FOR
     ANY FAILURE TO DO SO OR FOR ANY DELAY IN DOING SO.

          (b) If, at the original time or times appointed for the sale of the
     whole or any part of the Pledged Collateral, the highest bid, if there be
     but one sale, shall be inadequate to discharge in full all the Secured
     Obligations, or if the Pledged Collateral be offered for sale in lots, if
     at any of such sales, the highest bid for the lot offered for sale would
     indicate to Agent, in its discretion, that the proceeds of the sales of the
     whole of the Pledged Collateral would be unlikely to be sufficient to
     discharge all the Secured Obligations, Agent may, on one or more occasions
     and in its discretion, postpone any of said sales by public announcement at
     the time of sale or the time of previous postponement of sale, and no other
     notice of such postponement or postponements of sale need be given, any
     other notice being hereby waived; PROVIDED, HOWEVER, that any sale or sales
     made after such postponement shall be after ten (10) days' notice to each
     Pledgor.

          (c) If, at any time when Agent shall determine to exercise its right
     to sell the whole or any part of the Pledged Collateral hereunder, such
     Pledged Collateral or the part thereof to be sold shall not, for any reason
     whatsoever, be effectively registered under the Securities Act of 1933, as
     amended (or any similar statute then in effect) (the "Act") Agent may, in
     its discretion (subject only to applicable requirements of law), sell such
     Pledged Collateral or part thereof by private sale in such manner and under
     such circumstances as Agent may deem necessary or advisable, but subject to
     the other requirements of this SECTION 8, and shall not be required to
     effect such registration or to cause the same to be effected. Without
     limiting the generality of the foregoing, in any such event, Agent in its
     discretion (x) may, in accordance with applicable securities laws, proceed
     to make such private sale notwithstanding that a registration statement for
     the purpose of registering such Pledged Collateral or part thereof could be
     or shall have been filed under said Act (or similar statute), (y) may
     approach and negotiate with a single possible purchaser to effect such
     sale, and (z) may restrict such sale to a purchaser who is an accredited
     investor under the Act and who will represent and agree that such purchaser
     is purchasing for its own account, for investment and not with a view to
     the distribution or sale of such Pledged Collateral or any part thereof. In
     addition to a private sale as provided above in this SECTION 8, if any of
     the Pledged Collateral shall not be freely distributable to the public
     without registration under the Act (or similar statute) at the time of any
     proposed sale pursuant to this SECTION 8, then Agent shall not be required
     to effect such registration or cause the same to be effected but, in its
     discretion (subject only to applicable requirements of law), may require
     that any sale hereunder (including a sale at auction) be conducted subject
     to restrictions:


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               (i) as to the financial sophistication and ability of any Person
          permitted to bid or purchase at any such sale;

               (ii) as to the content of legends to be placed upon any
          certificates representing the Pledged Collateral sold in such sale,
          including restrictions on future transfer thereof;

               (iii) as to the representations required to be made by each
          Person bidding or purchasing at such sale relating to that Person's
          access to financial information about each Pledgor and such Person's
          intentions as to the holding of the Pledged Collateral so sold for
          investment for its own account and not with a view to the distribution
          thereof; and

               (iv) as to such other matters as Agent may, in its discretion,
          deem necessary or appropriate in order that such sale (notwithstanding
          any failure so to register) may be effected in compliance with the
          Bankruptcy Code and other laws affecting the enforcement of creditors'
          rights and the Act and all applicable state securities laws.

          (d) Each Pledgor recognizes that Agent may be unable to effect a
     public sale of any or all the Pledged Collateral and may be compelled to
     resort to one or more private sales thereof in accordance with CLAUSE (C)
     above. Each Pledgor also acknowledges that any such private sale may result
     in prices and other terms less favorable to the seller than if such sale
     were a public sale and, notwithstanding such circumstances, agrees that any
     such private sale shall not be deemed to have been made in a commercially
     unreasonable manner solely by virtue of such sale being private. Agent
     shall be under no obligation to delay a sale of any of the Pledged
     Collateral for the period of time necessary to permit the Pledged Entity to
     register such securities for public sale under the Act, or under applicable
     state securities laws, even if such Pledgor and the Pledged Entity would
     agree to do so.

          (e) Each Pledgor agrees to the maximum extent permitted by applicable
     law that following the occurrence and during the continuance of an Event of
     Default it will not at any time plead, claim or take the benefit of any
     appraisal, valuation, stay, extension, moratorium or redemption law now or
     hereafter in force in order to prevent or delay the enforcement of this
     Agreement, or the absolute sale of the whole or any part of the Pledged
     Collateral or the possession thereof by any purchaser at any sale
     hereunder, and each Pledgor waives the benefit of all such laws to the
     extent it lawfully may do so. Each Pledgor agrees that it will not
     interfere with any right, power and remedy of Agent provided for in this
     Agreement or now or hereafter existing at law or in equity or by statute or
     otherwise, or the exercise or beginning of the exercise by Agent of any one
     or more of such rights, powers or remedies. No failure or delay on the part
     of Agent to exercise any such right, power or remedy and no notice or
     demand which may be given to or made upon any Pledgor by Agent with respect
     to any such remedies shall operate as a waiver thereof, or limit or impair
     Agent's right to take any action or to exercise any power or remedy
     hereunder, without notice or demand, or prejudice its rights as against any
     Pledgor in any respect.


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          (f) Each Pledgor further agrees that a breach of any of the covenants
     contained in this SECTION 8 will cause irreparable injury to Agent, that
     Agent shall have no adequate remedy at law in respect of such breach and,
     as a consequence, agrees that each and every covenant contained in this
     SECTION 8 shall be specifically enforceable against such Pledgor, and each
     Pledgor hereby waives and agrees not to assert any defenses against an
     action for specific performance of such covenants except for a defense that
     the Secured Obligations are not then due and payable in accordance with the
     agreements and instruments governing and evidencing such obligations.

     9. WAIVER. No delay on Agent's part in exercising any power of sale, Lien,
option or other right hereunder, and no notice or demand which may be given to
or made upon any Pledgor by Agent with respect to any power of sale, Lien,
option or other right hereunder, shall constitute a waiver thereof, or limit or
impair Agent's right to take any action or to exercise any power of sale, Lien,
option, or any other right hereunder, without notice or demand, or prejudice
Agent's rights as against any Pledgor in any respect.

     10. ASSIGNMENT. Agent may assign, indorse or transfer any instrument
evidencing all or any part of the Secured Obligations as provided in, and in
accordance with, the Credit Agreement, and the holder of such instrument shall
be entitled to the benefits of this Agreement.

     11. TERMINATION. Immediately following the Termination Date, Agent shall
deliver to each Pledgor the Pledged Collateral pledged by such Pledgor at the
time subject to this Agreement and all instruments of assignment executed in
connection therewith, free and clear of the Liens hereof and, except as
otherwise provided herein, all of such Pledgor's obligations hereunder shall at
such time terminate.

     12. LIEN ABSOLUTE. All rights of Agent hereunder, and all obligations of
each Pledgor hereunder, shall be absolute and unconditional irrespective of:

          (a) any lack of validity or enforceability of the Credit Agreement,
     any other Loan Document or any other agreement or instrument governing or
     evidencing any Secured Obligations;

          (b) any change in the time, manner or place of payment of, or in any
     other term of, all or any part of the Secured Obligations, or any other
     amendment or waiver of or any consent to any departure from the Credit
     Agreement, any other Loan Document or any other agreement or instrument
     governing or evidencing any Secured Obligations;

          (c) any exchange, release or non-perfection of any other Collateral,
     or any release or amendment or waiver of or consent to departure from any
     guaranty, for all or any of the Secured Obligations;

          (d) the insolvency of any Credit Party; or

          (e) any other circumstance which might otherwise constitute a defense
     available to, or a discharge of, such Pledgor.


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     13. RELEASE. Each Pledgor consents and agrees that Agent may at any time,
or from time to time, in its discretion:

          (a) renew, extend or change the time of payment, and/or the manner,
     place or terms of payment of all or any part of the Secured Obligations;
     and

          (b) exchange, release and/or surrender all or any of the Collateral
     (including the Pledged Collateral), or any part thereof, by whomsoever
     deposited, which is now or may hereafter be held by Agent in connection
     with all or any of the Secured Obligations; all in such manner and upon
     such terms as Agent may deem proper, and without notice to or further
     assent from any Pledgor, it being hereby agreed that each Pledgor shall be
     and remain bound upon this Agreement, irrespective of the value or
     condition of any of the Collateral, and notwithstanding any such change,
     exchange, settlement, compromise, surrender, release, renewal or extension,
     and notwithstanding also that the Secured Obligations may, at any time,
     exceed the aggregate principal amount thereof set forth in the Credit
     Agreement, or any other agreement governing any Secured Obligations. Each
     Pledgor hereby waives notice of acceptance of this Agreement, and also
     presentment, demand, protest and notice of dishonor of any and all of the
     Secured Obligations, and promptness in commencing suit against any party
     hereto or liable hereon, and in giving any notice to or of making any claim
     or demand hereunder upon such Pledgor. No act or omission of any kind on
     Agent's part shall in any event affect or impair this Agreement.

     14. REINSTATEMENT. This Agreement shall remain in full force and effect and
continue to be effective should any petition be filed by or against any Pledgor
or any Pledged Entity for liquidation or reorganization, should any Pledgor or
any Pledged Entity become insolvent or make an assignment for the benefit of
creditors or should a receiver or trustee be appointed for all or any
significant part of any Pledgor's or a Pledged Entity's assets, and shall
continue to be effective or be reinstated, as the case may be, if at any time
payment and performance of the Secured Obligations, or any part thereof, is,
pursuant to applicable law, rescinded or reduced in amount, or must otherwise be
restored or returned by any obligee of the Secured Obligations, whether as a
"voidable preference", "fraudulent conveyance", or otherwise, all as though such
payment or performance had not been made. In the event that any payment, or any
part thereof, is rescinded, reduced, restored or returned, the Secured
Obligations shall be reinstated and deemed reduced only by such amount paid and
not so rescinded, reduced, restored or returned.

     15. MISCELLANEOUS.

          (a) Agent may execute any of its duties hereunder by or through agents
     or employees and shall be entitled to advice of counsel concerning all
     matters pertaining to its duties hereunder.

          (b) Each Pledgor agrees to promptly reimburse Agent for actual
     out-of-pocket expenses, including, without limitation, reasonable counsel
     fees, incurred by Agent in connection with the administration and
     enforcement of this Agreement.


                                       10

          (c) Neither Agent, nor any of its respective officers, directors,
     employees, agents or counsel shall be liable for any action lawfully taken
     or omitted to be taken by it or them hereunder or in connection herewith,
     except for its or their own gross negligence or willful misconduct as
     finally determined by a court of competent jurisdiction.

          (d) THIS AGREEMENT SHALL BE BINDING UPON EACH PLEDGOR AND ITS
     SUCCESSORS AND ASSIGNS (INCLUDING A DEBTOR-IN-POSSESSION ON BEHALF OF ANY
     PLEDGOR), AND SHALL INURE TO THE BENEFIT OF, AND BE ENFORCEABLE BY, AGENT
     AND ITS SUCCESSORS AND ASSIGNS, AND SHALL BE GOVERNED BY, AND CONSTRUED AND
     ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE
     TO CONTRACTS MADE AND PERFORMED IN THAT STATE, AND NONE OF THE TERMS OR
     PROVISIONS OF THIS AGREEMENT MAY BE WAIVED, ALTERED, MODIFIED OR AMENDED
     EXCEPT IN WRITING DULY SIGNED FOR AND ON BEHALF OF AGENT AND EACH PLEDGOR.

     16. SEVERABILITY. If for any reason any provision or provisions hereof are
determined to be invalid and contrary to any existing or future law, such
invalidity shall not impair the operation of or effect those portions of this
Agreement which are valid.

     17. NOTICES. Except as otherwise provided herein, whenever it is provided
herein that any notice, demand, request, consent, approval, declaration or other
communication shall or may be given to or served upon any of the parties by any
other party, or whenever any of the parties desires to give or serve upon any
other a communication with respect to this Agreement, each such notice, demand,
request, consent, approval, declaration or other communication shall be in
writing and either shall be delivered in person or sent by registered or
certified mail, return receipt requested, with proper postage prepaid, or by
facsimile transmission and confirmed by delivery of a copy by personal delivery
or United States Mail as otherwise provided herein:

          (a) If to Agent, at:

               General Electric Capital Corporation
               2 Bethesda Metro Center
               Suite 600
               Bethesda, Maryland  20814
               ATTN: General Counsel - Healthcare Financial Services
               Fax: (301) 664-9866

               With copies to:

               Latham & Watkins
               Sears Tower, Suite 5800
               233 S. Wacker Dr.
               Chicago, Illinois  60606
               ATTN: Jeffrey G. Moran
               Fax: (312) 993-9767


                                       11

               If to any Pledgor, at:

               c/o Primedex Health Systems, Inc.
               1510 Cotner Avenue
               Los Angeles, CA  90025
               ATTN:  Howard Berger, M.D.
               Fax: (310) 445-2980

               With a copy to:

               Sheppard, Mullin, Richter & Hampton LLP
               1901 Avenue of the Stars, Suite 1600
               Los Angeles, CA 90067
               ATTN:  Linda Michaelson
               Fax:  (310) 228-3701

or at such other address as may be substituted by notice given as herein
provided. The giving of any notice required hereunder may be waived in writing
by the party entitled to receive such notice. Every notice, demand, request,
consent, approval, declaration or other communication hereunder shall be deemed
to have been duly served, given or delivered (a) upon the earlier of actual
receipt and three (3) Business Days after deposit in the United States Mail,
registered or certified mail, return receipt requested, with proper postage
prepaid, (b) upon transmission, when sent by telecopy or other similar facsimile
transmission (with such telecopy or facsimile promptly confirmed by delivery of
a copy by personal delivery or United States Mail as otherwise provided in this
SECTION 17, (c) one (1) Business Day after deposit with a reputable overnight
courier with all charges prepaid, or (d) when delivered, if hand-delivered by
messenger. Failure or delay in delivering copies of any notice, demand, request,
consent, approval, declaration or other communication to the persons designated
above to receive copies shall in no way adversely affect the effectiveness of
such notice, demand, request, consent, approval, declaration or other
communication.

     18. SECTION TITLES. The Section titles contained in this Agreement are and
shall be without substantive meaning or content of any kind whatsoever and are
not a part of the agreement between the parties hereto.

     19. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, which shall, collectively and separately, constitute one
agreement.

     20. BENEFIT OF LENDERS. All security interests granted or contemplated
hereby shall be for the benefit of Agent and Lenders, and all proceeds or
payments realized from the Pledged Collateral in accordance herewith shall be
applied to the Obligations in accordance with the terms of the Credit Agreement.

                            [signature page follows]


                                       12

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed as of the date first written above.


                               PLEDGORS:
                               ---------

                               PRIMEDEX HEALTH SYSTEMS, INC.

                               By: /s/ Howard G. Berger
                               Name: Howard G. Berger, M.D.
                               Title: President


                               RADNET MANAGEMENT, INC.

                               By: /s/ Howard G. Berger
                               Name: Howard G. Berger, M.D.
                               Title: President


                               RADIOLOGIX, INC.

                               By: /s/ Howard G. Berger
                               Name: Howard G. Berger, M.D.
                               Title: President


                               QUESTAR IMAGING, INC.

                               By: /s/ Howard G. Berger
                               Name: Howard G. Berger, M.D.
                               Title: President



                      [Signature Page to Pledge Agreement]

                               GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT


                               By:  /s/ Andrew D. Moore
                               Name: Andrew D. Moore
                               Its Duly Authorized Signatory




                      [Signature Page to Pledge Agreement]