EXECUTION VERSION



                         STOCKHOLDERS SUPPORT AGREEMENT



            STOCKHOLDERS SUPPORT AGREEMENT, dated as of March 18, 2005 (this

"Stockholders Agreement"), among SIEMENS MEDICAL SOLUTIONS USA, INC., a Delaware

corporation ("Parent"), MI MERGER CO., a Delaware corporation and a wholly owned

subsidiary of Parent ("Purchaser"), and each stockholder whose names appear on

the signature pages of this Stockholders Agreement (each, a "Stockholder" and,

collectively, the "Stockholders").



            WHEREAS, as of the date hereof each Stockholder owns of record and

beneficially and has good, valid and marketable title to, free and clear of any

Lien, proxy, voting restriction, limitation on disposition, adverse claim of

ownership or use or encumbrance of any kind, other than pursuant to this

Stockholders Agreement, and has the sole power to vote and full right, power and

authority to sell, transfer and deliver, the number of shares of common stock,

par value $0.01 per share ("Company Common Stock"), of CTI Molecular Imaging,

Inc., a Delaware corporation (the "Company"), as set forth opposite such

Stockholder's name on Exhibit A hereto (all such shares of Company Common Stock

and any shares of Company Common Stock of which ownership of record or the power

to vote is hereafter acquired by any of the Stockholders prior to the

termination of this Stockholders Agreement being referred to herein as the

"Shares"); and



            WHEREAS, Parent, Purchaser and the Company propose to enter into,

simultaneously herewith, an Agreement and Plan of Merger (the "Merger

Agreement"; except as otherwise noted herein, terms used but not defined in this

Stockholders Agreement shall have the meanings ascribed to them in the Merger

Agreement), a draft of which has been made available to each Stockholder, which

provides, upon the terms and subject to the conditions thereof, for the merger

of Purchaser with and into the Company (the "Merger") following the consummation

of a cash tender offer by Purchaser to acquire all the issued and outstanding

shares of Company Common Stock (the "Offer").



            NOW, THEREFORE, in consideration of the foregoing and the mutual

covenants and agreements contained herein and in the Merger Agreement, and

intending to be legally bound hereby, the Stockholders hereby agree as follows:



            1. Tender of Shares. Each Stockholder hereby agrees that such

Stockholder (a) shall tender, or cause to be tendered, in the Offer, as promptly

as practicable, but in any event no later than five business days after the date

of commencement of the Offer, all of his or its Shares pursuant to the terms of

the Offer and (b) shall neither withdraw, nor cause to be withdrawn, such

Shares.



            2. Grant of Proxy. Each Stockholder, by this Stockholders Agreement,

with respect to his or its Shares, hereby grants an irrevocable proxy to Parent

(and agrees to execute such documents or certificates evidencing such proxy as

Parent may reasonably request) to vote, at any meeting of the stockholders of

the Company, and in any action by written consent of the



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stockholders of the Company, all of such Stockholder's Shares (a) in favor of

the approval and adoption of the Merger Agreement and approval of the Merger and

all other transactions contemplated by the Merger Agreement and this

Stockholders Agreement, (b) against any action, agreement or transaction (other

than the Merger Agreement or the transactions contemplated thereby) or proposal

(including any Competing Transaction) that would result in a breach of any

covenant, representation or warranty or any other obligation or agreement of the

Company under the Merger Agreement or that could result in any of the conditions

to the Company's obligations under the Merger Agreement not being fulfilled, and

(c) in favor of any other matter necessary to the consummation of the

transactions contemplated by the Merger Agreement and considered and voted upon

by the stockholders of the Company. Each Stockholder further agrees to cause

such Stockholder's Shares to be voted in accordance with the foregoing. THIS

PROXY IS IRREVOCABLE AND COUPLED WITH AN INTEREST. Each Stockholder hereby

acknowledges receipt and review of a copy of the Merger Agreement.



            3. Transfer of Shares. Each Stockholder agrees that he or it shall

not, directly or indirectly, (a) sell, assign, transfer (including by operation

of law), lien, pledge, dispose of or otherwise encumber any of the Shares or

otherwise agree to do any of the foregoing, (b) deposit any Shares into a voting

trust or enter into a voting agreement or arrangement or grant any proxy or

power of attorney with respect thereto that is inconsistent with this

Stockholders Agreement, (c) enter into any contract, option or other arrangement

or undertaking with respect to the direct or indirect acquisition or sale,

assignment, transfer (including by operation of law) or other disposition of any

Shares or (d) take any action that would make any representation or warranty of

such Stockholder herein untrue or incorrect in any material respect or have the

effect of preventing or disabling the Stockholder from performing his or its

obligations hereunder.

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