Document:

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Acuson Corporation                                                  Exhibit 10.3
--------------------------------------------------------------------------------

                                                               EXECUTION VERSION

                      THIRD AMENDMENT TO CREDIT AGREEMENT
                      -----------------------------------

     THIS THIRD AMENDMENT TO CREDIT AGREEMENT (this "Amendment"), dated as of
                                                     ---------
June 30, 2000 is entered into by and among:

          (1)  ACUSON CORPORATION, a Delaware corporation ("Borrower");
                                                            --------

          (2)  Each of the financial institutions from time to time listed in
     Schedule I to the Credit Agreement referred to in Recital A below
     ----------------------------------                ---------
     (collectively, the "Lenders"); and
                         -------

          (3)  ABN AMRO BANK N.V., acting through its San Francisco
     Representative Office, as agent for the Lenders (in such capacity,
     "Agent").
      -----

                                    RECITALS
                                    --------

     A.   Borrower, the Lenders and Agent are parties to that certain Credit
Agreement dated as of April 9, 1999, as amended by that certain First Amendment
to Credit Agreement dated as of December 16, 1999 and as further amended by that
certain Second Amendment to Credit Agreement dated as of March 17, 2000 (as
amended, the "Credit Agreement").
              ----------------

     B.   Borrower has requested that the Lenders and Agent amend the Credit
Agreement in certain respects.

     C.   The Lenders and Agent are so willing to amend the Credit Agreement
upon the terms and subject to the conditions set forth below.

                                   AGREEMENT
                                   ---------

     NOW, THEREFORE, in consideration of the above recitals and for other good
and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, Borrower, the Lenders and Agent hereby agree as follows:

     1.   Definitions, Interpretation.  All capitalized terms defined above and
          ---------------------------
elsewhere in this Amendment shall be used herein as so defined.  Unless
otherwise defined herein, all other capitalized terms used herein shall have the
respective meanings given to those terms in the Credit Agreement, as amended by
this Amendment.  The rules of construction set forth in Section I of the Credit
                                                        -----------------------
Agreement shall, to the extent not inconsistent with the terms of this
---------
Amendment, apply to this Amendment and are hereby incorporated by reference.

     2.   Amendments to Credit Agreement.  Subject to the satisfaction of the
          ------------------------------
conditions set forth in Paragraph 4 below, the Credit Agreement is hereby
                        -----------
amended as follows:

          (a)  Subparagraph 5.03(b) of the Credit Agreement is hereby amended to
               --------------------------------------------
     read in its entirety as follows:

                                       1
<PAGE>

Acuson Corporation                                                  Exhibit 10.3
--------------------------------------------------------------------------------

               (b)  Funded Indebtedness/EBITDA Ratio. Borrower shall not permit
                    --------------------------------
          its Funded Indebtedness/EBITDA Ratio to be greater than 2.50 to 1.00;
          provided, however, that if Borrower enters into a "synthetic" lease
          --------  -------
          transaction of the type described in clause (xii) of Subparagraph
                                               ----------------------------
          5.02(a), then on and after the effective date of such "synthetic"
          -------
          lease transaction Borrower shall not permit its Funded
          Indebtedness/EBITDA Ratio to be greater than 3.00 to 1.00; provided,
                                                                     --------
          further, that Borrower shall not be required to maintain the foregoing
          -------
          Funded Indebtedness/EBITDA Ratio for the four fiscal-quarter period
          ending on June 30, 2000.

          (b)  Subparagraph 5.03(c) of the Credit Agreement is hereby amended to
               --------------------------------------------
     read in its entirety as follows:

               (c)  Fixed Charge Coverage Ratio. Borrower shall not permit its
                    ---------------------------
          Fixed Charge Coverage Ratio for any consecutive four-fiscal quarter
          period ending on the date of each quarter to be less than the ratio
          set forth opposite such period below:

               Quarters ending on June 30, 1999,
                    September 30, 1999, December 31,
                    1999 and March 31, 2000                      2.00 to 1.00;

               Quarter ending on September 30, 2000              1.85 to 1.00;

               Each quarter thereafter                           2.00 to 1.00.

     3.   Representations and Warranties.  Borrower hereby represents and
          ------------------------------
warrants to Agent and the Lenders that the following are true and correct on the
date of this Amendment and that, after giving effect to the amendments set forth
in Paragraph 2 above, the following will be true and correct on the Effective
   -----------
Date (as defined below):

          (a)  The representations and warranties of Borrower and its
     Subsidiaries set forth in Paragraph 4.01 of the Credit Agreement and in the
                               --------------------------------------
     other Credit Documents are true and correct in all material respects
     (except with respect to representations and warranties that speak as of a
     particular date, which shall be true and correct as of such date);

          (b)  No Default or Event of Default has occurred and is continuing;
     and

          (c)  Each of the Credit Documents is in full force and effect.

(Without limiting the scope of the term "Credit Documents," Borrower expressly
acknowledges in making the representations and warranties set forth in this
Paragraph 3 that, on and after the date hereof, such term includes this
-----------
Amendment.)

     4.   Effective Date.  The amendments set forth in Paragraph 2 above, shall
          --------------                               -----------
become effective on June 30, 2000 (the "Effective Date"), subject to receipt by
                                        --------------
Agent and the Lenders on

                                       2
<PAGE>

Acuson Corporation                                                  Exhibit 10.3
--------------------------------------------------------------------------------

or prior to the Effective Date of the following, each in form and substance
satisfactory to Agent, the Lenders and their respective counsel:

          (a)  This Amendment duly executed by Borrower, the Lenders and Agent;

          (b)  A Certificate of the Secretary or the Assistant Secretary of
     Borrower in the form attached hereto as Attachment A, dated the Effective
                                             ------------
     Date, certifying that (i) the Certificate of Incorporation and Bylaws in
     the form delivered to Agent on April 9, 1999, and (ii) resolutions dated
     December 3, 1999 authorizing the transactions contemplated pursuant to the
     Credit Agreement and the other Credit Documents, delivered to Agent on
     December 16, 1999, are in full force and effect and have not been amended,
     supplemented, revoked or repealed since such date, and (iii) the
     incumbency, signatures and authority of the officers of Borrower authorized
     to execute, deliver and perform this Amendment, and all other documents,
     instruments or agreements related thereto executed or to be executed by
     Borrower; and

          (c)  Payment of a one-time, nonrefundable amendment fee of $10,000, to
     be shared among the Lender's pro rata in accordance with each Lender's
     Proportionate Share; and

          (d)  Such other evidence as Agent or any Lender may reasonably request
     to establish the accuracy and completeness of the representations and
     warranties and the compliance with the terms and conditions contained in
     this Amendment and the other Credit Documents.

     5.   Effect of this Amendment.  On and after the Effective Date, each
          ------------------------
reference in the Credit Agreement and the other Credit Documents to the Credit
Agreement shall mean the Credit Agreement as amended hereby.  Except as
specifically amended above, (a) the Credit Agreement and the other Credit
Documents shall remain in full force and effect and are hereby ratified and
confirmed and (b) the execution, delivery and effectiveness of this Amendment
shall not, except as expressly provided herein, operate as a waiver of any
right, power, or remedy of the Lenders or Agent, nor constitute a waiver of any
provision of the Credit Agreement or any other Credit Document.

     6.   Miscellaneous.
          -------------

          (a)  Counterparts.  This Amendment may be executed in any number of
               ------------
     identical counterparts, any set of which signed by all the parties hereto
     shall be deemed to constitute a complete, executed original for all
     purposes.

          (b)  Headings.  Headings in this Amendment are for convenience of
               --------
     reference only and are not part of the substance hereof.

          (c)  Governing Law.  This Amendment shall be governed by and construed
               -------------
     in accordance with the laws of the State of California without reference to
     conflicts of law rules.

                            [signature page follows]

                                       3
<PAGE>

Acuson Corporation                                                  Exhibit 10.3
--------------------------------------------------------------------------------

     IN WITNESS WHEREOF, Borrower, Agent and the Lenders have caused this
Amendment to be executed as of the day and year first above written.

BORROWER:                          ACUSON CORPORATION, a Delaware corporation

                                   By: /s/ Barry Zwarenstein
                                      ---------------------------------------
                                      Name:  Barry Zwarenstein
                                            ---------------------------------
                                      Title: Vice President, CFO
                                            ---------------------------------

AGENT:                             ABN AMRO BANK N.V., as Agent

                                   By: /s/ Gina M. Brusatori
                                      ---------------------------------------
                                      Name:  Gina M. Brusatori
                                            ---------------------------------
                                      Title: Group Vice President
                                            ---------------------------------

                                   By: /s/ Amanda Cox
                                      ---------------------------------------
                                      Name:  Amanda Cox
                                            ---------------------------------
                                      Title: Vice President
                                            ---------------------------------

LENDERS:                           ABN AMRO BANK N.V., as a Lender

                                   By: /s/ Gina M. Brusatori
                                      ---------------------------------------
                                      Name:  Gina M. Brusatori
                                            ---------------------------------
                                      Title: Group Vice President
                                            ---------------------------------

                                   By: /s/ Amanda Cox
                                      ---------------------------------------
                                      Name:  Amanda Cox
                                            ---------------------------------
                                      Title: Vice President
                                            ---------------------------------

                                   BNP PARIBAS, as a Lender

                                   By: /s/ Jeffrey S. Kajisa
                                      ---------------------------------------
                                      Name:  Jeffrey S. Kajisa
                                            ---------------------------------
                                      Title: Vice President
                                            ---------------------------------

                                   By: /s/ Sandra F. Bertram
                                      ---------------------------------------
                                      Name:  Sandra F. Bertram
                                            ---------------------------------
                                      Title: Assistant Vice President
                                            ---------------------------------

                                       4

<PAGE>

                                  ATTACHMENT A
                                  ------------

                  Form of [Assistant] Secretary's Certificate
                  -------------------------------------------

                               ACUSON CORPORATION
                      [ASSISTANT] SECRETARY'S CERTIFICATE

     Reference is made to that certain Credit Agreement, dated as of April 9,
1999 (as amended, the "Credit Agreement"), by and among Acuson Corporation, a
                       ----------------
Delaware corporation (the "Company"), each of the financial institutions listed
                           -------
in Schedule I to the Credit Agreement (collectively, the "Lenders"), and ABN
   ----------------------------------                     -------
AMRO Bank N.V., acting through its San Francisco Representative Office, as agent
for the Lenders (in such capacity, "Agent").  This Certificate is delivered
                                    -----
pursuant to Subparagraph 4(c) of that certain Third Amendment to Credit
            -----------------
Agreement dated as of June 30, 2000 (the "Third Amendment") with the intention
                                          ---------------
that the Lenders and Agent shall rely hereon in connection with the execution
and delivery of the Third Amendment.  Capitalized terms used herein without
definition shall have the meanings given to such terms in the Third Amendment.

     I, ________________, do hereby certify that I am the duly elected,
qualified and acting [Assistant] Secretary of the Company, and that, as such, I
am authorized to execute this Certificate on behalf of the Company, and I
further certify that:

          (a)  The following persons have been duly elected or appointed to, are
duly qualified for, and on the date hereof do hold, the offices of the Company
set forth opposite their respective names below, and as such, are authorized to
execute and deliver on behalf of the Company the Third Amendment, and all other
documents, instruments, or agreements related thereto executed or to be executed
by the Company, and that the signatures appearing below, opposite the name of
such persons are the authentic signature or facsimile thereof, respectively, of
such persons:

<TABLE>
<CAPTION>
Name                         Office                        Signature
----                         ------                        ---------
<S>                          <C>                           <C>
Barry Zwarenstein            Chief Financial Officer       /s/  Barry Zwarenstein
--------------------         -----------------------       ------------------------------

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

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

--------------------         -----------------------       ------------------------------
</TABLE>

                                       5
<PAGE>

          (b)  Each of the Company's (i) Certificate of Incorporation and Bylaws
in the form delivered to Agent on April 9, 1999, and (ii) resolutions dated
December 3, 1999 authorizing the transactions contemplated pursuant to the
Credit Agreement and the other Credit Documents, delivered to Agent on December
16, 1999, are in full force and effect and have not been amended, supplemented,
revoked or repealed since such date.

     IN WITNESS WHEREOF, I have executed this Certificate on and as of this 30th
day of June, 2000.

                              /s/ Charles H. Dearborn
                              ---------------------------------------------
                              Name:  Charles H. Dearborn II
                              Title: Sr. VP Human Resources and Legal
                                     Affairs, General Counsel & Secretary

                                       6<PAGE>

                                                                   Exhibit 10.41

THE SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, OR QUALIFIED UNDER APPLICABLE STATE
SECURITIES LAWS AND HAVE BEEN TAKEN FOR INVESTMENT PURPOSES ONLY AND NOT WITH A
VIEW TO OR FOR SALE IN CONNECTION WITH ANY DISTRIBUTION THEREOF. THE SECURITIES
MAY NOT BE SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION AND
QUALIFICATION WITHOUT, EXCEPT UNDER CERTAIN SPECIFIC LIMITED CIRCUMSTANCES, AN
OPINION OF COUNSEL FOR THE HOLDER, CONCURRED IN BY COUNSEL FOR THE COMPANY THAT
SUCH REGISTRATION AND QUALIFICATION ARE NOT REQUIRED.

                           INVENTA TECHNOLOGIES, INC.

                             STOCK PURCHASE WARRANT

     THIS CERTIFIES that GE Medical Systems, a division of General Electric
Company, a New York corporation (the "Holder"), is entitled, upon the terms and
subject to the conditions hereinafter set forth, at any time on or after the
date of this Warrant and on or prior to April 30, 2001 (the "Expiration Date"),
but not thereafter, to subscribe for and purchase, from Inventa Technologies,
Inc., a Delaware corporation (the "Company"), fifty-thousand (50,000) shares of
Company Common Stock (the "Shares") at an exercise price of Twenty Dollars
($20.00) per share (the "Exercise Price") subject to adjustment as set forth
below.

     1. Exercise of Warrant
        -------------------

          (a) Unless earlier terminated under Section 7, the purchase rights
represented by this Wan-ant are exercisable by the Holder, in whole or in part,
at any time after the date hereof and before the close of business on the
Expiration Date, by the surrender of this Warrant and the Notice of Exercise
annexed hereto duly executed at the principal executive office of the Company
(or such other office or agency of the Company as it may designate by notice in
writing to the Holder at the address of the Holder appearing on the books of the
Company), and upon payment of the Exercise Price of the Shares thereby purchased
(by cash or by cheek or bank draft payable to the order of the Company in an
amount equal to the Exercise Price of the shares thereby purchased); whereupon
the Holder shall be entitled to receive a certificate for the number of Shares
so purchased. The Company agrees that if at the time of the surrender of this
Warrant and purchase of the Shares, the Holder shall be entitled to exercise
this Warrant, the Shares so purchased shall be and be deemed to be issued to
such holder as the record owner of such Shares as of the close of business on
the date on which this Warrant shall have been exercised as aforesaid.

          (b) Certificates for Shares purchased hereunder shall be delivered to
the Holder within a reasonable time after the date on which this Warrant shall
have been exercised as aforesaid.

          (c) The Company covenants that all Shares which may be issued upon the
exercise of rights represented by this Warrant will, upon exercise of the rights
represented by this Warrant, be fully paid and nonassessable and free from all
taxes, liens and charges in respect of the issue thereof (other than taxes in
respect of any transfer occurring contemporaneously with such issue).
<PAGE>

     2. No Fractional Shares or Scrip. No fractional shares or scrip
        -----------------------------
representing fractional shares shall be issued upon the exercise of this
Warrant. With respect to any fraction of a share called for upon the exercise of
this Warrant, an amount equal to such fraction multiplied by the then current
price at which each Share may be purchased hereunder shall be paid in cash to
the Holder.

     3. Charges, Taxes and Expenses. Issuance of certificates for Shares upon
        ---------------------------
the exercise of this Warrant shall be made without charge to the holder hereof
for any issue or transfer tax or other incidental expense in respect of the
issuance of such certificate, all of which taxes and expenses shall be paid by
the Company, and such certificates shall be issued in the name of the Holder.

     4. No Rights as Shareholders. This Warrant does not entitle the Holder to
        -------------------------
any voting rights or other rights as a shareholder of the Company prior to the
exercise thereof.

     5. Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt by the
        -------------------------------------------------
Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
reimbursement to the Company of all reasonable expenses incidental thereto, and
upon surrender and cancellation of this Warrant, if mutilated, the Company will
make and deliver a new Warrant of like tenor and dated as of such cancellation,
in lieu of this Warrant.

     6. Saturdays, Sundays, Holidays, etc. If the last or appointed day for the
        ---------------------------------
taking of any action or the expiration of any right required or granted herein
shall be a Saturday or a Sunday or shall be a legal holiday, than such action
may be taken or such right may be exercised on the next succeeding day not a
legal holiday.

     7. Early Termination and Dilution.
        ------------------------------

          (a) Organic Change. In the event of any (a) sale, lease, exchange or
              --------------
other transfer of all or substantially all of the property, assets or business
of Company, (b), any liquidation, dissolution or winding up of Company, whether
voluntary or involuntary or (c) any merger or consolidation to which Company is
a party (an "Organic Change"), the Holder shall have the right thereafter to
receive, upon exercise of the Warrant, in lieu of the Common Stock issuable upon
such exercise prior to consummation of such Organic Change, the kind and amount
of shares of stock and other securities and property receivable (including cash)
upon the consummation of such Organic Change by a holder of that number of
shares of Common Stock into which the Warrant was exercisable immediately prior
to such Organic Change (including, on a pro rata basis, the cash, securities or
property received by holders of Common Stock in any tender or exchange offer
that is a step in such Organic Change). The Company must notify the Holder at
least 20 days prior to the consummation of any Organic Change. If Holder has not
exercised the Warrant by the effective date of the Organic Change, the Warrant
shall terminate.

          (b) Reclassification, etc. If the Company, at any time while this
              ---------------------
Warrant, or any portion hereof, remains outstanding and unexpired by
reclassification of securities or otherwise, shall change any of the securities
as to which purchase rights under this Warrant exist into the same or a
different number or securities or any other class or classes, this Warrant shall
thereafter represent the right to acquire such number and kind of securities as
would have been issuable as the result of such

                                      -2-
<PAGE>

change with respect to the securities that were subject to the purchase rights
under this Warrant immediately prior to such reclassification or other change
and the Exercise Price therefor shall be appropriately adjusted, all subject to
further adjustment as provided in this Section.

          (c) Split, Subdivision or Combination of Shares. If the Company at any
              -------------------------------------------
time while this Warrant, or any portion hereof, remains outstanding and
unexpired shall split, subdivide or combine the securities as to which purchase
rights under this Warrant exist, into a different number of securities of the
same class, then (i) the Exercise Price for such securities shall be
proportionately decreased in the case of a split or subdivision or
proportionately increased in the case of combination, in both cases by the ratio
which the total number of such securities to be outstanding immediately after
such event bears to the total number of such securities outstanding immediately
prior to such event, and (ii) the number of shares issuable under this Warrant
shall be proportionately increased in the case of a split or subdivision or
proportionately decreased in the case of combination, in both eases by the ratio
which the total number of such securities to be outstanding immediately after
such event bears to the total number of such securities outstanding immediately
prior to such event.

          (d) Cash Distributions. No adjustment on account of cash dividends or
              ------------------
interest on the Shares or other securities purchasable hereunder will be made to
the Exercise Price under this Warrant.

     8. Miscellaneous.
        -------------

          (a) Issue Date. The provisions of this Warrant shall be construed and
              ----------
shall be given effect in all respect as if it had been issued and delivered by
the Company on the date set forth below. This Warrant shall constitute a
contract under the laws of the State of California and for all purposes shall be
construed in accordance with and governed by the laws of said state.

          (b) Restrictions. The Holder acknowledges that the, Shares acquired
              ------------
upon the exercise of this Warrant may have restrictions upon its resale imposed
by state and federal securities laws.

          (c) Waivers and Amendments. This Warrant and any provisions hereof may
              ----------------------
be changed, waived, discharged or terminated only by an instrument in writing
signed by the party against which enforcement of the same is sought. This
Warrant shall be binding upon any successors or assigns of the Company.

          (d) Assignment and Transferability. This Warrant may be assigned or
              ------------------------------
transferred by the Holder only with the prior written approval of the Company.

                                      -3-
<PAGE>

          IN WITNESS WHEREOF, the Company has caused this Warrant to be executed
by its officers thereunto duly authorized.

Dated: June 8, 2000

                                         INVENTA TECHNOLOGIES, INC.

                                         /s/ Michael Shahbazian
                                         ------------------------------
                                         (Signature)

                                         Michael Shahbazian
                                         ------------------------------
                                         (Print Name)

                                         SVP & CFO
                                         ------------------------------
                                         (Title)

                                      -4-
<PAGE>

                               NOTICE OF EXERCISE
                               ------------------

TO:  Inventa Technologies, Inc.
     255 Shoreline Drive
     Redwood Shores, CA
     Attn: Secretary

1.   The undersigned hereby elects to purchase ______ shares of the ______ (the
     "Shares") of Inventa Technologies, Inc. pursuant to the terms of the
     attached Warrant, and tenders herewith payment of the purchase price in
     full, together with all applicable transfer taxes, if any.

2.   Please issue a certificate or certificates representing the Shares in the
     name of the undersigned or in such other name as is specified below:

                        ________________________________
                                  (Print Name)

                        ________________________________
                                   (Address)

                        ________________________________
                                   (Address)

3.   The undersigned confirms that the Shares are being acquired for the account
     of the undersigned for investment only and not with a view to, or for
     resale in connection with, the distribution thereof and that the
     undersigned has no present intention of distributing or selling the Shares.

_________________                     ________________________________
(Date)                                (Signature)

                                      ________________________________
                                      (Print Name)

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