Document:

REGISTRATION
        RIGHTS AGREEMENT

      

      This
        Registration Rights Agreement (this "Agreement")
        is
        made and entered into as of October 31, 2005 by and between Imagin Diagnostic
        Centres, Inc., 1835 Yonge St., Suite 500, Toronto,
        Ontario, Canada M4S, ("Purchaser"),
        and
        Positron Corporation, a Texas corporation (the "Company").

      

      R
        E C
        I T A L S :

      

      WHEREAS,
        concurrent with the execution of this Agreement the Company and Purchaser
        are
        entering into a Note Purchase Agreement (as defined below) pursuant to which
        Purchaser will purchase from the Company Convertible Promissory Notes in
        the
        aggregate principal amount of $400,000 (the "Notes");
        and

      

      WHEREAS,
        the Notes are convertible at the option of the holders into shares of the
        Company's Common Stock (the "Common Stock").

      

      NOW,
        THEREFORE, in consideration of the mutual promises, representations, warranties
        and conditions set forth in this Agreement, the parties hereto, intending
        to be
        legally bound, hereby agree as follows:

      

      A G R E E M E N T
        :

      

      1. Definitions.
        For
        purposes of this Agreement, in addition to the definitions set forth above
        and
        elsewhere herein, the following terms shall have the following respective
        meanings:

      

      "Acquisition
        Shares"
        shall
        mean the shares of Common Stock which the Purchaser will have a right to
        acquire
        upon the conversion of the Notes.

      

      "Commission"
        shall
        mean the United States Securities and Exchange Commission and any successor
        agency.

      

      "Demand
        Date"
        shall
        mean the date the Company receives the written request for registration of
        Registrable Stock from Purchaser pursuant to Section 3 hereof.

      

      "Exchange
        Act"
        shall
        mean the Securities Exchange Act of 1934, as amended, or any similar federal
        statute, and the rules and regulations of the Commission thereunder, all
        as the
        same shall be in effect at the time.

      

      "Holder"
        shall
        mean the Purchaser and all transferees or assignees thereof to whom the rights
        under this Agreement are assigned in accordance with the provisions of
        Section 8 hereof.

      

      "Note
        Purchase Agreement"
        shall
        mean the Note Purchase Agreement between the Company and the Purchaser, dated
        as
        of October 31, 2005.

      

      
        
          
          

        

        
          
          

          
            

          

        

        
          
          

        

      

      "Person"
        shall
        mean an individual, corporation, partnership, limited partnership, syndicate,
        person (including, without limitation, a "person" as defined in
        Section 13(d)(3) of the Exchange Act), trust, association or entity
        or
        government, political subdivision, agency or instrumentality of a
        government.

      

      "Register,"
        "registered"
        and
        "registration"
        shall
        refer to a registration effected by preparing and filing a registration
        statement or similar document in compliance with the Securities Act and the
        declaration or ordering of effectiveness of such registration statement or
        document.

      

      "Registrable
        Stock"
        shall
        mean (a) the Acquisition Shares, (b) any shares of Common Stock
        or
        other capital stock issued as a dividend, or other distribution with respect
        to,
        or in exchange for, or in replacement of, any of the Acquisition Shares and
        (c) any shares of capital stock issued by way of a stock split of
        the
        Acquisition Shares referred to in clause (a) above. For purposes of
        this
        Agreement, any Registrable Stock shall cease to be Registrable Stock when
        (i) a registration statement covering such Registrable Stock has been
        declared effective and such Registrable Stock has been disposed of pursuant
        to
        such effective registration statement, (ii) such Registrable Stock
        is sold
        by a person in a transaction in which the rights under the provisions of
        this
        Agreement are not assigned, or (iii) all such Registrable Stock may
        be sold
        by any and all Holders pursuant to Rule 144(k) (or any similar provision
        then in
        force, but not Rule 144A) under the Securities Act without registration
        under the Securities Act.

      

      "Securities
        Act"
        shall
        mean the Securities Act of 1933, as amended, or any similar federal statute,
        and
        the rules and regulations of the Commission thereunder, all as the same shall
        be
        in effect at the time.

      

      2. Restrictive
        Legend.
        Each
        certificate representing Acquisition Shares shall, except as otherwise provided
        in this Section 2, be stamped or otherwise imprinted with a legend
        substantially in the form set forth in the Note Purchase Agreement. A
        certificate shall not bear such legend if in the opinion of counsel satisfactory
        to the Company or the Company shall determine that the securities being sold
        thereby may be publicly sold without registration under the Securities Act
        or
        the transfer of such securities is permitted under the provisions of Regulation
        D, Rule 144(k) or Rule 144A (or any rule permitting public
        sale
        without registration under the Securities Act).

      

      3. Registration
        Rights.
        Upon
        the written request of Purchaser to the Company, the Company shall use its
        reasonable best efforts to prepare and file with the Commission a registration
        statement on an applicable form, signed, pursuant to Section 6(a)
        of the
        Securities Act, by the officers and directors of the Company, with respect
        to
        the Registrable Stock. If the Company shall fail to register the shares of
        Registrable Stock, the Company shall deliver the unregistered shares of
        Registrable Stock to the Purchaser and such shares may be sold pursuant to
        and
        subject to the requirements of Rule 144 under the Securities Act. The Company's
        delivery of the unregistered shares shall be the Purchaser's sole remedy
        for any
        failure by the Company to register shares pursuant to this Section 3. In
        connection with this Section 3, the Company shall:

      

      (a) cause
        such registration statement to become effective on or before the three-month
        anniversary of the Demand Date and to remain effective through and including
        the
        earlier of (i) the time when all of the Registrable Stock has been
        sold
        pursuant to such registration statement or (ii) the time when all
        of the
        Holders of the Registrable Stock can sell all of the Registrable Stock pursuant
        to Rule 144(k) (or any similar provision then in force, but not
        Rule 144A) under the Securities Act without registration under the
        Securities Act.

      

      
        
          
          

        

        
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      (b) prepare
        and file with the Commission such amendments and supplements to such
        registration statement, signed, pursuant to Section 6(a) of the Securities
        Act, by the officers and directors of the Company, and the prospectus used
        in
        connection therewith as may be necessary to comply with the provisions of
        the
        Securities Act with respect to the disposition of all Registrable Stock covered
        by such registration statement;

      

      (c) furnish
        to the Holders such numbers of copies of the registration statement and the
        prospectus included therein (including each preliminary prospectus and any
        amendments or supplements thereto) in conformity with the requirements of
        the
        Securities Act and such other documents and information as they may reasonably
        request;

      

      (d) use
        its
        reasonable best efforts to register or qualify the Registrable Stock covered
        by
        such registration statement under such other securities or blue sky laws
        of such
        jurisdictions within the United States and Puerto Rico as required by law
        for
        the distribution of the Registrable Stock covered by the registration statement;
        provided, however, that the Company shall not be required in connection
        therewith or as a condition thereto to qualify to do business in or to file
        a
        general consent to service of process in any jurisdiction wherein it would
        not
        but for the requirements of this paragraph (d) be obligated to do
        so; and
        provided, further, that the Company shall not be required to qualify such
        Registrable Stock in any jurisdiction in which the securities regulatory
        authority requires that any Holder submit any shares of its Registrable Stock
        to
        the terms, provisions and restrictions of any escrow, lockup or similar
        agreement(s) for consent to sell Registrable Stock in such jurisdiction unless
        such Holder agrees to do so;

      

      (e) promptly
        notify each Holder for whom such Registrable Stock is covered by such
        registration statement, at any time when a prospectus relating thereto is
        required to be delivered under the Securities Act, of the happening of any
        event
        as a result of which the prospectus included in such registration statement,
        as
        then in effect, includes an untrue statement of a material fact or omits
        to
        state any material fact required to be stated therein or necessary to make
        the
        statements therein not misleading in light of the circumstances under which
        they
        were made, and at the request of any such Holder promptly prepare and furnish
        to
        such Holder a reasonable number of copies of a supplement to or an amendment
        of
        such prospectus as may be necessary so that, as thereafter delivered to Holders
        of such securities, such prospectus shall not include any untrue statement
        of a
        material fact or omit to state a material fact required to be stated therein
        or
        necessary to make the statements therein not misleading in light of the
        circumstances under which they were made;

      

      (f) enter
        into customary agreements and take such other actions as are reasonably required
        in order to expedite or facilitate the disposition of the Registrable Stock
        to
        be so included in the registration statement;

      

      
        
          
          

        

        
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      (g) otherwise
        use its reasonable best efforts to comply with all applicable rules and
        regulations of the Commission;

      

      (h) use
        its
        reasonable best efforts to list the Registrable Stock covered by such
        registration statement with any securities exchange on which Common Stock
        is
        then listed; and

      

      (i) after
        the
        effectiveness of the registration statement, cooperate with the Holders to
        facilitate the timely preparation and delivery of certificates representing
        the
        Registrable Stock to be sold, which certificates shall not bear any restrictive
        legends other than restrictive legends still required to be imposed by the
        Note
        Purchase Agreement.

      

      4. Suspension
        of Trading.
        Notwithstanding any other provision of this Agreement, the Company shall
        have
        the right at any time to require that all Holders suspend further open market
        offers and sales of Registrable Stock whenever, and for so long as, in the
        reasonable judgment of the Company in good faith based upon the advice of
        counsel satisfactory to the Holders of a majority of the Registrable Stock,
        there is in existence material undisclosed information or events with respect
        to
        the Company (the "Suspension
        Right")
        such
        that the registration statement would contain any untrue statement of a material
        fact or omit to state any material fact required to be stated therein or
        necessary to make the statements therein not misleading in light of the
        circumstances under which they were made. In the event the Company exercises
        the
        Suspension Right, such suspension will continue for such period of time
        reasonably necessary for disclosure to occur at a time that is not materially
        detrimental to the Company or until such time as the registration statement
        does
        not include any untrue statement of a material fact or omit to state any
        material fact required to be stated therein or necessary to make the statements
        therein not misleading in light of the circumstances under which they were
        made,
        each as determined in good faith by the Company. The Company will promptly
        give
        the Holders notice, in a writing signed by an executive officer of the Company,
        of any exercise of the Suspension Right. The Company agrees to notify the
        Holders promptly upon termination of the Suspension Right. Notwithstanding
        the
        foregoing, under no circumstances shall Holder be entitled to exercise the
        Suspension Right for more than sixty calendar days in any twelve-month
        period.

      

      5. Furnish
        Information.
        It
        shall be a condition precedent to the obligations of the Company to take
        any
        action pursuant to this Agreement that the Holders shall furnish to the Company
        such information regarding themselves, the Registrable Stock held by them,
        and
        the intended method of disposition of such securities as the Company shall
        reasonably request and as shall be required in connection with the action
        to be
        taken by the Company.

      

      6. Expenses
        of Registration.
        So long
        as the Company has received at least $400,000 in principal under the Notes,
        all
        expenses incurred in connection with the registration pursuant to this
        Agreement, including without limitation all registration, filing and
        qualification fees, word processing, duplicating, printers' and accounting
        fees
        (including the expenses of any special audits or comfort letters required
        by or
        incident to such performance and compliance), fees of the National Association
        of Securities Dealers, Inc. or listing fees, messenger and delivery expenses,
        all fees and expenses of complying with state securities or blue sky laws,
        reasonable fees and disbursements of counsel for the Company (collectively,
        the
        "Expenses"),
        shall
        be paid by the Company. If the Company has not received at least $400,000
        in
        principal under the Notes and Purchaser has requested registration pursuant
        to
        this Agreement, all Expenses shall be paid by Purchaser. In the event Expenses
        are to be paid by Purchaser, such Expenses shall be prepaid by Purchaser
        to the
        Company upon receipt of a reasonable estimate from the Company (the
        "Expenses
        Estimate").
        To
        extent the Expenses Estimate exceeds actual Expenses, Purchaser shall be
        reimbursed within 30 days of the effective registration of the Registrable
        Stock. To extent the Expenses Estimate is insufficient to cover total actual
        Expenses, Purchaser shall reimburse the Company for such excess within 30
        days
        of receipt of an invoice for such excess Expenses. The parties agree that
        all
        underwriting discounts and commissions shall be the responsibility of the
        Holders.

      

      
        
          
          

        

        
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      7. Indemnification.

      

      (a) To
        the
        extent permitted by applicable law, the Company shall indemnify and hold
        harmless each Holder, such Holder's directors and officers, any underwriter
        (as
        defined in the Securities Act), and each person, if any, who controls such
        Holder or underwriter within the meaning of the Securities Act, against any
        losses, claims, damages or liabilities, joint or several, to which they may
        become subject under the Securities Act or any other applicable state or
        federal
        law, insofar as such losses, claims, damages or liabilities (or proceedings
        in
        respect thereof) arise out of or are based on any untrue or alleged untrue
        statement of any material fact contained in such registration statement on
        the
        effective date thereof (including any prospectus filed under Rule 424
        under
        the Securities Act or any amendments or supplements thereto) or arise out
        of or
        are based upon the omission or alleged omission to state therein a material
        fact
        required to be stated therein or necessary to make the statements therein
        not
        misleading, and shall reimburse each such Holder, such Holder's directors
        and
        officers, such underwriter or controlling person for any legal or other expenses
        reasonably incurred by them (but not in excess of expenses incurred in respect
        of one counsel and one local counsel for all of them unless, in the reasonable
        judgment of an indemnified party there is potential conflict of interest
        between
        any indemnified parties, which indemnified parties may be represented by
        separate counsel and local counsel) in connection with investigating or
        defending any such loss, claim, damage, liability or action; provided, however,
        that the indemnity agreement contained in this Section 7(a) shall
        not apply
        to amounts paid in settlement of any such loss, claim, damage, liability
        or
        action if such settlement is effected without the consent of the Company
        (which
        consent shall not be unreasonably withheld); provided, further, that the
        Company
        shall not be liable to any Holder, such Holder's directors and officers,
        underwriter or controlling person in any such case for any such loss, claim,
        damage, liability or action to the extent that it arises out of or is based
        upon
        an untrue statement or alleged untrue statement or omission or alleged omission
        made in connection with such registration statement, preliminary prospectus,
        final prospectus or amendments or supplements thereto, in reliance upon and
        in
        conformity with written information furnished expressly for use in connection
        with such registration by any such Holder, such Holder's directors and officers,
        underwriter or controlling person. Such indemnity shall remain in full force
        and
        effect regardless of any investigation made by or on behalf of any such Holder,
        such Holder's directors and officers, underwriter or controlling person,
        and
        shall survive the transfer of such securities by such Holder.

      

      
        
          
          

        

        
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      (b) To
        the
        extent permitted by applicable law, each Holder shall indemnify and hold
        harmless the Company, each of its directors and officers, each person, if
        any,
        who controls the Company within the meaning of the Securities Act, and any
        underwriter (within the meaning of the Securities Act) for the Company against
        any losses, claims, damages or liabilities, joint or several, to which the
        Company or any such director, officer, controlling person or underwriter
        may
        become subject, under the Securities Act or any other applicable state or
        federal law, insofar as such losses, claims, damages or liabilities (or
        proceedings in respect thereof) arise out of or are based upon any untrue
        statement or alleged untrue statement of any material fact contained in such
        registration statement on the effective date thereof (including any prospectus
        filed under Rule 424 under the Securities Act or any amendments or
        supplements thereto) or arise out of or are based upon the omission or alleged
        omission to state therein a material fact required to be stated therein or
        necessary to make the statements therein not misleading, in each case to
        the
        extent, but only to the extent, that such untrue statement or alleged untrue
        statement or omission or alleged omission was made in such registration
        statement in reliance upon and in conformity with written information furnished
        expressly by or on behalf of such Holder for use in connection with such
        registration; and each such Holder shall reimburse any legal or other expenses
        reasonably incurred by the Company or any such director, officer, controlling
        person, agent or underwriter (but not in excess of expenses incurred in respect
        of one counsel and one local counsel for all of them unless, in the reasonable
        judgment to of an indemnified party, there is a conflict of interest between
        any
        indemnified parties, which indemnified parties may be represented by separate
        counsel and local counsel) in connection with investigating or defending
        any
        such loss, claim, damage, liability or action; provided, however, that the
        indemnity agreement contained in this Section 7(b) shall not apply
        to
        amounts paid in settlement of any such loss, claim, damage, liability or
        action
        if such settlement is effected without the consent of such Holder (which
        consent
        shall not be unreasonably withheld), and provided, further, that the liability
        of each Holder hereunder shall be limited to the proportion of any such loss,
        claim, damage, liability or expense which is equal to the proportion that
        the
        net proceeds from the sale of the shares sold by such Holder under any such
        registration statement bears to the total net proceeds from the sale of all
        securities sold thereunder, but not in any event to exceed the net proceeds
        received by such Holder from the sale of Registrable Stock covered by such
        registration statement.

      

      (c) Promptly
        after receipt by an indemnified party under this Section of notice of the
        commencement of any action, such indemnified party shall, if a claim in respect
        thereof is to be made against any indemnifying party under this Section,
        notify
        the indemnifying party in writing of the commencement thereof and the
        indemnifying party shall have the right to participate in and assume the
        defense
        thereof with counsel selected by the indemnifying party and reasonably
        satisfactory to the indemnified party; provided, however, that the exercise
        of
        the foregoing right shall be conditioned upon the written acknowledgment
        of the
        indemnifying party to the indemnified party of the indemnifying party's
        obligation hereunder to indemnify the indemnified party for any losses arising
        from such action; and provided further, that in such event, the indemnified
        party shall have the right to retain its own counsel and local counsel, with
        all
        fees and expenses thereof to be paid by such indemnified party, and to be
        apprised of all progress in any proceeding the defense of which has been
        assumed
        by the indemnifying party. The failure to notify an indemnifying party promptly
        of the commencement of any such action, shall only release the indemnifying
        party from any of its obligations under this Section 7(c) if, and
        only to
        the extent that, such indemnifying party is materially prejudiced by such
        failure, but the omission to so notify the indemnifying party will not relieve
        it of any liability that it may have to any indemnified party otherwise than
        under this Section.

      

      
        
          
          

        

        
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      (d) To
        the
        extent any indemnification by an indemnifying party is prohibited or limited
        by
        law, the indemnifying party, in lieu of indemnifying such indemnified party,
        shall contribute to the amount paid or payable by such indemnified party
        as a
        result of such losses, claims, damages or liabilities in such proportion
        as is
        appropriate to reflect the relative fault of the indemnifying party and
        indemnified party in connection with the actions which resulted in such losses,
        claims, damages or liabilities, as well as any other relevant equitable
        considerations. The relative fault of such indemnifying party and indemnified
        party shall be determined by reference to, among other things, whether any
        action in question, including any untrue or alleged untrue statement of material
        fact or omission or alleged omission to state a material fact, has been made
        by,
        or relates to information supplied by, such indemnifying party or indemnified
        party, and the parties' relative intent, knowledge, access to information
        and
        opportunity to correct or prevent such action. The amount paid or payable
        by a
        party as a result of the losses, claims, damages or liabilities referred
        to
        above shall be deemed to include any legal or other fees or expenses reasonably
        incurred by such party in connection with any investigation or
        proceeding.

      

      The
        parties hereto agree that it would not be just and equitable if contribution
        pursuant to this Section 7(d) were determined by pro rata allocation
        or by
        any other method of allocation which does not take account of the equitable
        considerations referred to in the immediately preceding paragraph. No person
        guilty of fraudulent misrepresentation (within the meaning of Section 11(f)
        of the Securities Act) shall be entitled to contribution from any person
        who was
        not guilty of such fraudulent misrepresentation.

      

      8. Transfer
        of Registration Rights.
        Subject
        to any transfer restrictions set forth in the Note Purchase Agreement or
        the
        Notes the rights of any Holder under this Agreement with respect to any
        Registrable Stock may be transferred to any transferee of such Registrable
        Stock; provided, however, that (i) the transferring Holder shall give
        the
        Company written notice at or prior to the time of such transfer stating the
        name
        and address of the transferee and identifying the securities with respect
        to
        which the rights under this Agreement are being transferred; (ii) such
        transferee shall agree in writing, in form and substance reasonably satisfactory
        to the Company, to be bound as a Holder by the provisions of this Agreement;
        and
        (iii) immediately following such transfer the further disposition
        of such
        securities by such transferee is restricted under the Securities Act. Except
        as
        set forth in this Section 8, no transfer of Registrable Stock shall
        cause
        such Registrable Stock to lose such status.

      

      9. Successors
        and Assigns.
        Except
        as otherwise expressly provided herein, the terms and conditions of this
        Agreement shall inure to the benefit of and be binding upon the respective
        successors and assigns of the parties hereto. Except as expressly provided
        in
        this Agreement, nothing in this Agreement, express or implied, is intended
        to
        confer upon any person other than the parties hereto or their respective
        successors and assigns any rights, remedies, obligations, or liabilities
        under
        or by reason of this Agreement.

      

      
        
          
          

        

        
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      10. Counterparts;
        Titles.
        This
        Agreement may be executed and delivered (including by facsimile transmission)
        in
        one or more counterparts, and by the different parties hereto in separate
        counterparts, each of which shall be deemed to be an original, but all of
        which
        taken together shall constitute one and the same agreement. The titles of
        the
        Sections of this Agreement are used for convenience only and are not to be
        considered in construing or interpreting this Agreement.

      

      11. Notices.
        Any
        notice required or permitted hereunder shall be given in writing and shall
        be
        conclusively deemed effectively given upon personal delivery or delivery
        by
        courier, or on the first business day after transmission if sent by confirmed
        facsimile transmission or electronic mail transmission, or five days after
        deposit in the United States mail, by registered or certified mail, postage
        prepaid, addressed (i) if to the Company, as set forth below the Company's
        name
        on the signature page of this Agreement, and (ii) if to an Investor, at such
        Investor's address as set forth on the Signature page of this Agreement,
        or at
        such other address as the Company or such Investor may designate by 10 days'
        advance written notice to the other parties hereto.

      

      12. Amendments
        and Waivers.
        Any
        provision of this Agreement may be amended and the observance of any provision
        of this Agreement may be waived (either generally or in a particular instance
        and either retroactively or prospectively), only with the written consent
        of the
        Company and the Holders of at least 50% of the Registrable Stock then
        outstanding. Any amendment or waiver effected in accordance with this
        Section 12 shall be binding upon each Holder of any securities subject
        to
        this Agreement at the time outstanding (including securities into which such
        securities are convertible), each future Holder and all such securities,
        and the
        Company. No failure or delay by any party in exercising any right, power
        or
        privilege hereunder shall operate as a waiver thereof nor shall any single
        or
        partial exercise thereof preclude any other or further exercise thereof or
        the
        exercise of any other right, power or privilege.

      

      13. Severability;
        Entire Agreement.
        If one
        or more provisions of this Agreement are held to be unenforceable under
        applicable law, such provisions shall be excluded from this Agreement and
        the
        balance of this Agreement shall be interpreted as if such provisions were
        so
        excluded and shall be enforceable in accordance with its terms. All prior
        agreements of the parties concerning the subject matter of this Agreement
        are
        expressly superseded by this Agreement. This Agreement contains the entire
        Agreement of the parties concerning the subject matter hereof. Any oral
        representations or modifications of this Agreement shall be of no
        effect.

      

      14. Governing
        Law.
        This
        Agreement shall be governed by and construed in accordance with the laws
        of the
        State of Texas without regard to conflicts of law principles.

      

      15. Forum;
        Waiver of Jury Trial.

      

      (a) All
        actions and proceedings arising out of or relating to this Agreement shall
        be
        heard and determined in the Texas Superior Court or the United States Superior
        Court located in the City of Houston, Texas. The parties hereto hereby
        (i) submit to the exclusive jurisdiction of the Texas Superior Court
        or the
        United States Superior Court located in the City of Houston, Texas for the
        purpose of any action or proceeding arising out of or relating to this Agreement
        brought by any party hereto, and (ii) waive, and agree not to assert
        by way
        of motion, defense, or otherwise, in any such action, any claim that it is
        not
        subject personally to the jurisdiction of the above-named courts, that its
        property is exempt or immune from attachment or execution, that the action
        or
        proceeding is brought in an inconvenient forum, that the venue of the action
        or
        proceeding is improper, or that this Agreement may not be enforced in or
        by any
        of the above-named courts.

      

      
        
          
          

        

        
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      (b) EACH
        OF
        THE PARTIES HERETO HEREBY WAIVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE
        LAW ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY WITH RESPECT TO ANY ACTIONS
        OR
        PROCEEDINGS DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION
        WITH
        THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

      

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      IN
        WITNESS WHEREOF, the parties hereto have executed this Registration Rights
        Agreement as of the date first above written.

      

      
        	
                POSITRON
                  CORPORATION,
                  

                a
                  Texas corporation

                 

                 

                By:                                                                  
                  

                Patrick
                  G. Rooney, Chairman of the Board

                 

                 

                Address:   
                  1304
                  Langham Creek Drive, #300, 

                                    Houston,
                  Texas 77084

              	
                IMAGIN
                  DIAGNOSTIC CENTRES, INC.

                 

                 

                 

                By:                                                                  
                  

                Name:
                                                                      
                  

                Title:
                                                                        
                  

                 

                Address:      1835
                  Yonge St., Suite 500

                                      
                  Toronto, Ontario, Canada M4S 

              

      

      

      

      
        
          
          

        

        
          -10-Unassociated Document

    Exhibit
      4.1

    
MAZAL
      PLANT PHARMACEUTICALS INC

    2005
      STOCK COMPENSATION PLAN

    

    

    SECTION
      1. Purpose. 

    

    The
      purposes of this Mazal Plant Pharmaceuticals Inc 2005 Stock Compensation Plan
      (the "Plan") are to encourage selected employees, officers, directors and
      consultants of, and other individuals providing services to, Mazal Plant
      Pharmaceuticals Inc (together with any successor thereto, the "Company") and
      its
      Affiliates (as defined below) to acquire a proprietary interest in the growth
      and performance of the Company, to generate an increased incentive to contribute
      to the Company's future success and prosperity thus enhancing the value of
      the
      Company for the benefit of its stockholders, and to enhance the ability of
      the
      Company and its Affiliates to attract and retain exceptionally qualified
      individuals upon whom, in large measure, the sustained progress, growth and
      profitability of the Company depend.

    

    SECTION
      2. Definitions.
      

     

    As
      used
      in the Plan, the following
      terms shall have the meanings set forth below:

    

    "Affiliate"
      shall mean (i) any entity that, directly or through one or more intermediaries,
      is controlled by the Company and (ii) any entity in which the Company has a
      significant equity interest, as determined by the Board.

    

    "Award"
      shall mean any Restricted Security granted under the Plan.

    

    "Award
      Agreement" shall mean any written agreement, contract or other instrument or
      document evidencing any Award granted under the Plan.

    

    "Board"
      shall mean the Board of Directors of the Company.

    

    "Cause",
      as used in connection with the termination of a Participant's employment or
      a
      Participant's consulting relationship, as the case may be, shall mean (i) with
      respect to any Participant employed under a written employment agreement or
      otherwise providing services to the Company pursuant to a written agreement
      with
      the Company or an Affiliate of the Company which agreement includes a definition
      of "cause," "cause" as defined in such agreement or, if such agreement contains
      no such definition, a material breach by the Participant of such agreement,
      or
      (ii) with respect to any other Participant, the failure to perform adequately
      in
      carrying out such Participant's employment or consulting responsibilities,
      as
      the case may be, including any directives from the Board, or engaging in such
      behavior in his personal or business life as to lead the Board in its reasonable
      judgment to determine that it is in the best interests of the Company to
      terminate his employment or consulting relationship, as the case may
      be.

    

    
      
        
        

      

      
        1

        
          

        

      

      
        
        

      

    

     

    "Common
      Stock" shall mean the common stock of the Company.

    

    "Code"
      shall mean the Internal Revenue Code of 1986, as amended from time to time,
      and
      the regulations promulgated thereunder.

    

    "Common
      Shares" shall mean any or all, as applicable, of the Common Stock and such
      other
      securities or property as may become the subject of Awards, or become subject
      to
      Awards, pursuant to an adjustment made under Section 4(b) of the Plan and any
      other securities of the Company or any Affiliate or any successor
      that

    may
      be so
      designated by the Board.

    

    "Employee"
      shall mean any employee of the Company or of any Affiliate.

    

    "Exchange
      Act" shall mean the Securities Exchange Act of 1934, as amended.

    

    "Fair
      Market Value" shall mean (A) with respect to any property other than the Common
      Shares, the fair market value of such property determined by such methods or
      procedures as shall be established from time to time by the Board; and (B)
      with
      respect to the Common Shares, the last sale price regular way on the date of
      reference, or, in case no sale takes place on such date, the average of the
      high
      bid and low asked prices, in either case on the principal national securities
      exchange on which the Common Shares are listed or admitted to trading, or if
      the
      Common Shares are not listed or admitted to trading on any national securities
      exchange, the last sale price reported on the National Market
      System of the National Association of Securities Dealers Automated Quotation
      System ("NASDAQ") on such date, or the last sale price in the over-the-counter
      market reported on the NASD OTC Bulletin Board on such date, whichever is
      applicable, or if there are no such prices reported on the NASD OTC Bulletin
      Board on such date, as furnished to the Board by any New York Stock Exchange
      member selected from time to time by the Board for such purpose. If there is
      no
      bid or asked price reported on any such date, the Fair Market Value shall be
      determined by the Board in accordance with the regulations promulgated under
      Section 2031 of the Code, or by any other appropriate method selected by the
      Board.

    

    "Good
      Reason", as used in connection with the termination of a Participant's
employment
      or consulting relationship, as the case may be, shall mean (i) with respect
      to
      any Participant employed under a written employment agreement or otherwise
      providing services to the Company pursuant to a written agreement with the
      Company or an Affiliate of the Company, "good reason" as defined in such written
      agreement or, if such agreement contains no such definition, a material breach
      by the Company of such agreement, or (ii) with respect to any other Participant,
      a failure by the Company to pay such Participant any amount otherwise vested
      and
      due and a continuation of such failure for 30 business days following notice
      to
      the Company thereof.

    

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

    

    "Participant"
      shall mean any individual granted an Award under the Plan.

     

    “Person"
      shall mean any individual, corporation, partnership, association, joint-stock
      company, trust, unincorporated organization, or government or political
      subdivision thereof.

    

    "Released
      Securities" shall mean securities that were Restricted Securities but with
      respect to which all applicable restrictions have expired, lapsed or been waived
      in accordance with the terms of the Plan or the applicable Award
      Agreement.

    

    "Restricted
      Securities" shall mean any Common Shares granted under Section 6(a) of the
      Plan,
      any right granted under Section 6(a) of the Plan that is denominated in Common
      Shares or any other Award under which issued and outstanding Common Shares
      are
      held subject to certain restrictions.

    

    "Rule
      16a-1" and "Rule 16b-3" shall mean, respectively, Rule 16a-1 and Rule 16b-3
      promulgated by the Securities and Exchange Commission under the Exchange Act,
      or
      any successor rule or regulation thereto as in effect from time to
      time.

     

    "Securities
      Act" shall mean the Securities Act of 1933, as amended.

    

    SECTION
      3. Administration. 

    

    The
      Plan
      shall be administered by the Board. Subject to the terms of the Plan and
      applicable law, and in addition to other express powers and authorizations
      conferred on the Board by the Plan, the Board shall have full power and
      authority to: (i) designate Participants; (ii) determine the type or types
      of
      Awards to be granted to an eligible Employee or other individual under the
      Plan;
      (iii) determine the number of Common Shares to be covered by Awards; (iv)
      determine the terms and conditions of any Award; (v) determine whether, to
      what
      extent, and under what circumstances Awards may be settled or exercised, or
      canceled, forfeited or suspended, and the method or methods by which Awards
      may
      be settled, exercised, canceled, forfeited or suspended; (vi) determine
      requirements for the vesting of Awards or performance criteria to be achieved
      in
      order for Awards to vest; (vii) determine whether, to what extent and under
      what
      circumstances Common Shares payable with respect to an Award under the Plan
      shall be deferred either automatically or at the election of the holder thereof
      or of the Board; (viii) interpret and administer the Plan and any instrument
      or
      agreement relating to, or Award made under, the Plan; (ix) establish, amend,
      suspend or waive such rules and regulations and appoint such agents as it shall
      deem appropriate for the proper administration of the Plan; and (x) make any
      other determination and take any other action that the Board deems necessary
      or
      desirable for the administration of the Plan. Unless otherwise expressly
      provided in the Plan, all designations, determinations, interpretations and
      other decisions under or with respect to the Plan or any Award shall be within
      the sole discretion of the Board, may be made at any time and shall be final,
      conclusive and binding upon all Persons, including the Company, any Affiliate,
      any Participant, any holder or beneficiary of any Award, any stockholder and
      any
      Employee. No Awards under this Plan shall be granted after December 31,
      2015.

    

    
      
        
        

      

      
        3

        
          

        

      

      
        
        

      

    

    SECTION
      4. Common Shares Available for Awards.

    

    (a)
      Common Shares Available. Subject to adjustment as provided in Section
      4(b):

    

    (i)
      Calculation of Number of Common Shares Available. The number of Common Shares
      available for granting Awards under the Plan shall be 1,000,000 (One Million),
      any or all of which may be or may be based on Common Stock, any other security
      which becomes the subject of Awards, or any combination thereof. Initially
      1,000,000 (One Million) shares of Common Stock shall be reserved for Awards
      hereunder. Further, if, after the effective date of the Plan, any Common Shares
      covered by an Award granted under the Plan or to which such an
      Award

    relates,
      are forfeited, or if an Award otherwise terminates or is canceled without the
      delivery of Common Shares, then the Common Shares covered by such Award or
      to
      which such Award relates, or the number of Common Shares otherwise counted
      against the aggregate number of Common Shares available under the Plan with
      respect to such Award, to the extent of any such forfeiture, termination or
      cancellation, shall again be, or shall become, available for granting Awards
      under the Plan.

    

    (ii)
      Sources of Common Shares Deliverable Under Awards. Any Common Shares delivered
      pursuant to an Award may consist, in whole or in part, of authorized and
      unissued Common Shares or of treasury Common Shares.

     

    (b)
      Adjustments. In the event that the Board shall determine that any dividend
      or
      other distribution (whether in the form of cash, Common Shares, other securities
      or other property), recapitalization, stock split, reverse stock split,
      reorganization, merger, consolidation, split-up, spin-off, combination,
      repurchase or exchange of Common Shares or other securities of the Company,
      issuance of warrants or other rights to purchase Common Shares or other
      securities of the Company, or other similar corporate transaction or event
      affects the Common Shares such that an adjustment is determined by the Board
      to
      be appropriate in order to prevent dilution or enlargement of the benefits
      or
potential
      benefits intended to be made available under the Plan, then the Board shall,
      in
      such manner as it may deem equitable, adjust any or all of (i) the number and
      kind of Common Shares (or other securities or property) which thereafter may
      be
      made the subject of Awards, (ii) the number and kind of Common Shares (or other
      securities or property) subject to outstanding Awards, and (iii) the grant
      or
      exercise price with respect to any Award or, if deemed appropriate, make
      provision for a cash payment to the holder of an outstanding Award; provided,
      however, that the number of Common Shares subject to any Award denominated
      in
      Common Shares shall always be a whole number.

     

    
      
        
        

      

      
        4

        
          

        

      

      
        
        

      

    

    SECTION
      5. Eligibility. 

    

    Any
      Employee, including any officer or employee-director of the Company or of any
      Affiliate, and any consultant of, or other individual providing services to,
      the
      Company or any Affiliate shall be eligible to be designated a
      Participant.

    

    SECTION
      6. Awards.

    

    (a)
      Restricted Securities.

    

    (i)
      Issuance. The Board is hereby authorized to grant to eligible Employees
      "Restricted Securities" which shall consist of the right to receive, by purchase
      or otherwise, Common Shares which are subject to such restrictions as the Board
      may impose (including, without limitation, any limitation on the right to vote
      such Common Shares or the right to receive any dividend or other right or
      property), which restrictions may lapse separately or in combination at such
      time or times, in such installments or otherwise, as the Board may deem
      appropriate.

    

    (ii)
      Registration. Restricted Securities granted under the Plan may be evidenced
      in
      such manner as the Board may deem appropriate, including, without limitation,
      book-entry registration or issuance of a stock certificates or certificates.
      In
      the event any stock certificate is issued respect of Restricted Securities
      granted under the Plan, such certificate shall be registered in the name of
      the
      Participant and shall bear an appropriate legend referring to the terms,
      conditions and restrictions applicable to such Restricted
      Securities.

    

    (iii)
      Forfeiture. Except as otherwise determined by the Board, upon termination of
      a
      Participant's employment or a Participant's consulting relationship, as the
      case
      may be, for any reason during the applicable restriction period, all of such
      Participant's Restricted Securities which had not become Released Securities
      by
      the date of termination of employment or consulting relationship shall be
      forfeited and reacquired by the Company; provided, however, that the Board
      may,
      when it finds that a waiver would be in the best interests of the Company,
      waive
      in whole or in part any or all remaining restrictions with respect to such
      Participant's Restricted Securities. Unrestricted Common Shares, evidenced
      in
      such manner as the Board shall deem appropriate, shall be issued to the holder
      of Restricted Securities promptly after such Restricted Securities become
      Released Securities.

    

    (b)
      General.

    

    (i)
      Limits on Transfer of Awards.

    

    (A)
      No
      Award (other than Released Securities), and no right under any such Award,
      may
      be assigned, alienated, pledged attached, sold or otherwise transferred or
      encumbered by a Participant otherwise than by will or by the laws of descent
      and
      distribution (or, in the case of Restricted Securities, to the Company) and
      any
      such purported assignment, alienation, pledge, attachment, sale or other
      transfer or encumbrance shall be void and unenforceable against the Company
      or
      any Affiliate.

    

    
      
        
        

      

      
        5

        
          

        

      

      
        
        

      

    

    (B)
      Each
      Award, and each right under any Award, shall be exercisable, during the
      Participant's lifetime only by the Participant or if permissible under
      applicable law, by the Participant's guardian or legal
      representative.

    

    (ii)
      Terms of Awards. The term of each Award shall be for such period as may be
      determined by the Board.

    

    (iii)
      Rule 16b-3 Six-Month Limitations. To the extent required in order to maintain
      the exemption provided under Rule 16b-3 only, any equity security offered
      pursuant to the Plan must be held for at least six months after the date of
      grant, and with respect to any derivative security issued pursuant to the Plan,
      at least six months must elapse from the date of acquisition of such derivative
      security to the date of disposition of the derivative security (other than
      upon
      exercise or conversion) or its underlying equity security. Terms used in the
      preceding sentence shall, for the purposes of such sentence only, have the
      meanings, if any, assigned or attributed to them under Rule 16a-1 and Rule
      16b-3.

    

    (iv)
      Common Share Certificates. All certificates for Common Shares delivered under
      the Plan pursuant to any Award or the exercise thereof shall be subject to
      such
      stop transfer orders and other restrictions as the Board may deem advisable
      under the Plan or the rules, regulations, and other requirements of the
      Securities and Exchange Commission, any stock exchange upon which such Shares
      are then listed, and any applicable Federal or state securities laws, and the
      Board may cause a legend or legends to be put on any such certificates to make
      appropriate reference to such restrictions.

    

    (v)
      Delivery of Common Shares or Other Securities and Payment by Participant of
      Consideration. No Common Shares or other securities shall be delivered pursuant
      to any Award until payment in full of any amount required to be paid pursuant
      to
      the Plan or the applicable Award Agreement is received by the Company. Such
      payment may be made by such method or methods and in such form or forms as
      the
      Board shall determine, including, without limitation, cash, Common Shares,
      other
      securities, other Awards or other property, or any combination thereof; provided
      that the combined value, as determined by the Board, of all cash and cash
      equivalents and the
      Fair
      Market Value of any such Common Shares or other property so tendered to the
      Company, as of the date of such tender, is at least equal to the full amount
      required to be paid pursuant to the Plan or the applicable Award Agreement
      to
      the Company.

    

    
      
        
        

      

      
        6

        
          

        

      

      
        
        

      

    

     

    SECTION
      7. Amendments. 

    

    Except
      to
      the extent prohibited by applicable law:

    

    (a)
      Amendments to the Plan. The Board may amend, alter, suspend, discontinue, or
      terminate the Plan without the consent of any stockholder, Participant, other
      holder or beneficiary of an Award, or other Person; provided, however, that
      any
      amendment, alteration, suspension, discontinuation, or termination that would
      impair the rights of any Participant, or any other holder or beneficiary of
      any
      Award theretofore granted, shall not to that extent be effective without the
      consent of such Participant, other holder or beneficiary of an Award, as the
      case may be.

    

    (b)
      Amendments to Awards. The Board may amend any terms of, or alter, suspend,
      discontinue, cancel or terminate, any Award theretofore granted, prospectively
      or retroactively; provided, however, that any amendment, alteration, suspension,
      discontinuation, cancellation or termination that would impair the rights of
      any
      Participant or holder or beneficiary of any Award theretofore granted, shall
      not
      to that extent be effective without the consent of such Participant or holder
      or
      beneficiary of an Award, as the case may be.

    

    SECTION
      8. General Provisions.

    

    (a)
      No
      Right to Awards. No Employee or other Person shall have any claim to be
granted
      any Award under the Plan, and there is no obligation for uniformity of treatment
      of Employees, or holders or beneficiaries of Awards under the Plan. The terms
      and conditions of Awards need not be the same with respect to each
      recipient.

    

    (b)
      Correction of Defects, Omissions, and Inconsistencies. The Board may correct
      any
      defect, supply any omission, or reconcile any inconsistency in the Plan or
      any
      Award in the manner and to the extent it shall deem desirable to carry the
      Plan
      into effect.

    

    (c)
      Withholding. The Company or any Affiliate shall be authorized to withhold from
      any Award granted, from any payment due or transfer made under any Award or
      under the Plan or from any compensation or other amount owing to a Participant
      the amount (in cash, Common Shares, other securities, other Awards, or other
      property) of withholding taxes due in respect of an Award, its exercise, or
      any
      payment or transfer under such Award or under the Plan and to take such other
      action as may be necessary in the opinion of the Company or Affiliate to satisfy
      all obligations for the payment of such taxes.

    

    (d)
      No
      Right to Employment. The grant of an Award shall not be construed as giving
      a
      Participant the right to be retained in the employ of the Company or any
      Affiliate. Further, the Company or an Affiliate may at any time dismiss a
      Participant from employment, free from any liability, or any claim under the
      Plan, unless otherwise expressly provided in the Plan or in any Award
      Agreement.

    

    
      
        
        

      

      
        7

        
          

        

      

      
        
        

      

    

    (e)
      Governing Law. The validity, construction, and effect of the Plan and any rules
      and regulations relating to the Plan shall be determined in accordance with
      the
      laws of the State of Nevada and applicable Federal law.

    

    (f)
      Severability. If any provision of the Plan or any Award is or becomes or is
      deemed to be invalid, illegal or unenforceable in any jurisdiction or as to
      any
      Person or Award under any law deemed applicable by the Board, such provision
      shall be construed or deemed amended to conform to applicable laws, or if it
      cannot be construed or deemed amended without, in the determination of the
      Board, materially altering the intent of the Plan or the Award, such provision
      shall be stricken as to such jurisdiction, Person or Award and the remainder
      of
      the Plan and any such Award shall remain in full force and effect.

    

    (g)
      No
      Trust or Fund Created. Neither the Plan nor any Award shall create or be
construed
      to create a trust or separate fund of any kind or a fiduciary relationship
      between the Company or any Affiliate and a Participant or any other Person.
      To
      the extent that any Person acquires a right to receive payments from the Company
      or any Affiliate pursuant to an Award, such right shall be no greater than
      the
      right of any unsecured general creditor of the Company or any
      Affiliate.

    

    (h)
      No
      Fractional Common Shares. No fractional Common Shares shall be issued or
      delivered pursuant to the Plan or any Award, and the Board shall determine
      whether cash, other securities, or other property shall be paid or transferred
      in lieu of any fractional Common Shares or whether such fractional Common Shares
      or any rights thereto shall be canceled, terminated, or otherwise
      eliminated.

    

    (i)
      Headings. Headings are given to the Sections and subsections of the Plan solely
      as a convenience to facilitate reference. Such headings shall not be deemed
      in
      any way material or relevant to the construction or interpretation of the Plan
      or any provision thereof.

    

    SECTION
      9. Adoption, Approval and Effective Date of the Plan.

    

    The
      Plan
      was adopted by the Board effective November 9, 2005.

    

    
      
        
        

      

      
        8

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