WARRANT TO PURCHASE SHARES OF COMMON STOCK OF NOVARAY MEDICAL, INC.

Exhibit 10.3

THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”) OR ANY STATE SECURITIES LAWS AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR THE ISSUER SHALL HAVE RECEIVED AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE ISSUER THAT REGISTRATION OF SUCH SECURITIES UNDER THE SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED.

WARRANT TO PURCHASE

SHARES OF COMMON STOCK

OF

NOVARAY MEDICAL, INC.

Expires: July 2, 2014

No.: W-B-09-01

Date of Issuance: July 2, 2009

FOR VALUE RECEIVED, the undersigned, NOVARAY MEDICAL, INC., a Delaware corporation (together with its successors and assigns, the “ Issuer ”), hereby certifies that VISION OPPORTUNITY MASTER FUND LTD. or its registered assigns is entitled to subscribe for and purchase, during the Term (as hereinafter defined), up to the greater of (a) One Million Five Hundred Thousand (1,500,000) or (b) one hundred percent (100%) of that number of shares of the Company’s Common Stock into which the Note (as defined in the Purchase Agreement) issued to the applicable purchaser converts or if such Note converts into Conversion Securities (as defined in the Purchase Agreement), the initial principal amount of such Note divided by the per unit price of the Conversion Securities (subject to adjustment as hereinafter provided) of the duly authorized, validly issued, fully paid and non-assessable Common Stock of the Issuer, at an exercise price per share equal to the Warrant Price then in effect, subject, however, to the provisions and upon the terms and conditions hereinafter set forth. Capitalized terms used in this Warrant and not otherwise defined herein shall have the respective meanings specified in Section 8 hereof.

1.  Term . The term of this Warrant shall commence on the date hereof and shall expire at 6:00 p.m., Eastern Time, on July 2, 2014 (such period being the “ Term ”).

2.  Method of Exercise; Payment; Issuance of New Warrant; Transfer and Exchange .

(a)  Time of Exercise . The purchase rights represented by this Warrant may be exercised in whole or in part during the Term.

(b) Method of Exercise . The Holder hereof may exercise this Warrant, in whole or in part, by the surrender of this Warrant (with the exercise form attached hereto duly executed) at the principal office of the Issuer, and by the payment to the Issuer of an amount of consideration therefor equal to the Warrant Price in effect on the date of such exercise multiplied by the number of shares of Warrant Stock with respect to which this Warrant is then being exercised, payable at such Holder’s election (i) by certified or official bank check or by wire transfer to an account designated by the Issuer, (ii) by “cashless exercise” in accordance with the provisions of subsection (c)  of this Section 2 , or (iii) by a combination of the foregoing methods of payment selected by the Holder of this Warrant.

(c)  Cashless Exercise . Notwithstanding any provisions herein to the contrary and commencing one (1) year following the Original Issue Date if the Per Share Market Value of one share of Common Stock is greater than the Warrant Price (at the date of calculation as set forth below), the Holder may exercise this Warrant by a cashless exercise and shall receive the number of shares of Common Stock equal to an amount (as determined below) by surrender of this Warrant at the principal office of the Issuer together with the properly endorsed Notice of Exercise in which event the Issuer shall issue to the Holder a number of shares of Common Stock computed using the following formula:

(d)  Issuance of Stock Certificates . In the event of any exercise of this Warrant in accordance with and subject to the terms and conditions hereof, certificates for the shares of Warrant Stock so purchased shall be dated the date of such exercise and delivered to the Holder hereof within a reasonable time, not exceeding three (3) Trading Days after such exercise (the “ Delivery Date ”) or, at the request of the Holder (provided that a registration statement under the Securities Act providing for the resale of the Warrant Stock is then in effect and the Holder so requests in writing of the Issuer), issued and delivered to the Depository Trust Company (“ DTC ”) account on the Holder’s behalf via the Deposit Withdrawal Agent Commission System (“ DWAC ”) within a reasonable time, not exceeding three (3) Trading Days after such exercise, and the Holder hereof shall be deemed for all purposes to be the holder of the shares of Warrant Stock so purchased as of the date of such exercise. Notwithstanding the foregoing to the contrary, the Issuer or its transfer agent shall only be obligated to issue and deliver the shares to the DTC on a holder’s behalf via DWAC if the Issuer and its transfer agent are participating in

DTC through the DWAC system. The Holder shall deliver this original Warrant, or an indemnification undertaking in a form reasonably satisfactory to the Issuer with respect to such Warrant in the case of its loss, theft or destruction, at such time that this Warrant is fully exercised. With respect to partial exercises of this Warrant, the Issuer shall keep written records for the Holder of the number of shares of Warrant Stock exercised as of each date of exercise.

(e)  Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Exercise . In addition to any other rights available to the Holder, if the Issuer fails to cause its transfer agent to transmit to the Holder a certificate or certificates representing the Warrant Stock pursuant to an exercise on or before the Delivery Date, and if after such date the Holder is required by its broker to purchase (in an open market transaction or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the Holder of the Warrant Stock which the Holder anticipated receiving upon such exercise (a “ Buy-In ”), then the Issuer shall (1) pay in cash to the Holder the amount by which (x) the Holder’s total purchase price (including brokerage commissions, if any) for the shares of Common Stock so purchased exceeds (y) the amount obtained by multiplying (A) the number of shares of Warrant Stock that the Issuer was required to deliver to the Holder in connection with the exercise at issue times (B) the Warrant Price, as may be adjusted in accordance with this Warrant, and (2) at the option of the Holder, either reinstate the portion of the Warrant and equivalent number of shares of Warrant Stock for which such exercise was not honored or deliver to the Holder the number of shares of Common Stock that would have been issued had the Issuer timely complied with its exercise and delivery obligations hereunder. For example, if the Holder purchases Common Stock having a total purchase price of $11,000 to cover a Buy-In with respect to an attempted exercise of the Warrant for shares of Common Stock with an aggregate sale price giving rise to such purchase obligation of $10,000, under clause (1) of the immediately preceding sentence the Issuer shall be required to pay the Holder $1,000. The Holder shall provide the Issuer written notice indicating the amounts payable to the Holder in respect of the Buy-In, together with applicable confirmations and other evidence reasonably requested by the Issuer. Nothing herein shall limit a Holder’s right to pursue any other remedies available to it hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Issuer’s failure to timely deliver certificates representing shares of Common Stock upon exercise of this Warrant as required pursuant to the terms hereof.

(f)  Transferability/Exchangeability of Warrant . Subject to Section 2(h) hereof, this Warrant may be transferred by a Holder, in whole or in part, without the consent of the Issuer. If transferred pursuant to this paragraph, this Warrant may be transferred on the books of the Issuer by the Holder hereof in person or by duly authorized attorney, upon surrender of this Warrant at the principal office of the Issuer, properly endorsed (by the Holder executing an assignment in the form attached hereto) and upon payment of any necessary transfer tax or other governmental charge imposed upon such transfer. This Warrant is exchangeable at the principal office of the Issuer for Warrants to purchase the same aggregate number of shares of Warrant Stock, each new Warrant to represent the right to purchase such number of shares of Warrant Stock as the Holder hereof shall designate at the time of such exchange. All Warrants issued on transfers or exchanges shall be dated the Original Issue Date and shall be identical with this Warrant except as to the number of shares of Warrant Stock issuable pursuant thereto.

(g) Continuing Rights of Holder . The Issuer will, at the time of or at any time after each exercise of this Warrant, upon the request of the Holder hereof, acknowledge in writing the extent, if any, of its continuing obligation to afford to such Holder all rights to which such Holder shall continue to be entitled after such exercise in accordance with the terms of this Warrant; provided that if any such Holder shall fail to make, or the Issuer shall fail to honor, any such request, the failure shall not affect the continuing obligation of the Issuer to afford such rights to such Holder.

(h)  Compliance with Securities Laws.

(i) The Holder of this Warrant, by acceptance hereof, acknowledges that this Warrant and the shares of Warrant Stock to be issued upon exercise hereof are being acquired solely for the Holder’s own account and not as a nominee for any other party, and for investment, and that the Holder will not offer, sell or otherwise dispose of this Warrant or any shares of Warrant Stock to be issued upon exercise hereof except pursuant to an effective registration statement, or an exemption from registration, under the Securities Act and any applicable state securities laws.

(ii) Except as provided in paragraph (iii) below, this Warrant and all certificates representing shares of Warrant Stock issued upon exercise hereof shall be stamped or imprinted with a legend in substantially the following form:

THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”) OR ANY STATE SECURITIES LAWS AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR THE ISSUER SHALL HAVE RECEIVED AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE ISSUER THAT REGISTRATION OF SUCH SECURITIES UNDER THE SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED.

(iii) The Issuer agrees to reissue this Warrant or certificates representing any of the Warrant Stock, without the legend set forth above if at such time, prior to making any transfer of any such securities, the Holder shall give written notice to the Issuer describing the manner and terms of such transfer. Such proposed transfer will not be effected until: (a) either (i) the Issuer has received an opinion of counsel reasonably satisfactory to the Issuer, to the effect that the registration of such securities under the Securities Act is not required in connection with such proposed transfer, or (ii) a registration statement under the Securities Act covering such proposed disposition has been filed by the Issuer with the Securities and Exchange Commission and has become effective under the Securities Act, and (b) either (i) the Issuer has received an opinion of counsel reasonably satisfactory to the Issuer, to the effect that registration or qualification under the securities or “blue sky” laws of any state is not required in connection with such proposed disposition, or (ii) compliance with applicable state securities or “blue sky” laws has been effected or a valid exemption exists with respect thereto. The Issuer will respond to any such notice from a holder within five (5) Trading Days. In the case of any proposed transfer under this Section 2(h) , the Issuer will pay the expenses of and use reasonable efforts to comply with any 

such applicable state securities or “blue sky” laws, but shall in no event be required, (x) to qualify to do business in any state where it is not then qualified, or (y) to take any action that would subject it to tax or to the general service of process in any state where it is not then subject. The restrictions on transfer contained in this Section 2(h) shall be in addition to, and not by way of limitation of, any other restrictions on transfer contained in any other section of this Warrant. Whenever a certificate representing the Warrant Stock is required to be issued to a Holder without a legend, at the request of the Holder, in lieu of delivering physical certificates representing the Warrant Stock, the Issuer shall cause its transfer agent to electronically transmit the Warrant Stock to the Holder by crediting the account of the Holder’s Prime Broker with DTC through its DWAC system (to the extent not inconsistent with any provisions of this Warrant or the Purchase Agreement).

(i)  Accredited Investor Status . In no event may the Holder exercise this Warrant in whole or in part unless the Holder is an “accredited investor” as defined in Regulation D under the Securities Act.

3.  Stock Fully Paid; Reservation and Listing of Shares; Covenants .

(a)  Stock Fully Paid . The Issuer represents, warrants, covenants and agrees that all shares of Warrant Stock which may be issued upon the exercise of this Warrant or otherwise hereunder will, when issued in accordance with the terms of this Warrant, be duly authorized, validly issued, fully paid and non-assessable and free from all taxes, liens and charges. The Issuer further covenants and agrees that during the period within which this Warrant may be exercised, the Issuer will at all times have authorized and reserved for the purpose of the issuance upon exercise of this Warrant a number of authorized but unissued shares of Common Stock equal to at least one hundred ten percent (110%) of the number of shares of Common Stock issuable upon exercise of this Warrant without regard to any limitations on exercise.

(b) Reservation . If any shares of Common Stock required to be reserved for issuance upon exercise of this Warrant or as otherwise provided hereunder require registration or qualification with any Governmental Authority under any federal or state law before such shares may be so issued, the Issuer will in good faith use best efforts as expeditiously as possible at its expense to cause such shares to be duly registered or qualified. If the Issuer shall list any shares of Common Stock on any securities exchange or market it will, at its expense, list thereon, and maintain and increase when necessary such listing of, all shares of Warrant Stock from time to time issued upon exercise of this Warrant or as otherwise provided hereunder ( provided that such Warrant Stock has been registered pursuant to a registration statement under the Securities Act then in effect), and, to the extent permissible under the applicable securities exchange rules, all unissued shares of Warrant Stock which are at any time issuable hereunder, so long as any shares of Common Stock shall be so listed. The Issuer will also so list on each securities exchange or market, and will maintain such listing of, any other securities which the Holder of this Warrant shall be entitled to receive upon the exercise of this Warrant if at the time any securities of the same class shall be listed on such securities exchange or market by the Issuer.

(c)  Covenants . The Issuer shall not by any action including, without limitation, amending the Certificate of Incorporation or the by-laws of the Issuer, or through any reorganization,

transfer of assets, consolidation, merger, dissolution, issue or sale of securities or any other action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such actions as may be necessary or appropriate to protect the rights of the Holder hereof against dilution (to the extent specifically provided herein) or impairment. Without limiting the generality of the foregoing, the Issuer will (i) not permit the par value, if any, of its Common Stock to exceed the then effective Warrant Price, (ii) not amend or modify any provision of the Certificate of Incorporation or by-laws of the Issuer in any manner that would materially and adversely affect the rights of the Holders of the Warrants, (iii) take all such action as may be reasonably necessary in order that the Issuer may validly and legally issue fully paid and nonassessable shares of Common Stock, free and clear of any liens, claims, encumbrances and restrictions (other than as provided herein) upon the exercise of this Warrant, and (iv) use best efforts to obtain all such authorizations, exemptions or consents from any public regulatory body having jurisdiction thereof as may be reasonably necessary to enable the Issuer to perform its obligations under this Warrant.

(d)  Loss, Theft, Destruction, Mutilation of Warrants . Upon receipt of evidence satisfactory to the Issuer of the ownership of and the loss, theft, destruction or mutilation of any Warrant and, in the case of any such loss, theft or destruction, upon receipt of indemnity or security satisfactory to the Issuer or, in the case of any such mutilation, upon surrender and cancellation of such Warrant, the Issuer will make and deliver, in lieu of such lost, stolen, destroyed or mutilated Warrant, a new Warrant of like tenor and representing the right to purchase the same number of shares of Common Stock.

(e)  Payment of Taxes . The Issuer will pay any documentary stamp taxes attributable to the initial issuance of the Warrant Stock issuable upon exercise of this Warrant; provided, however , that the Issuer shall not be required to pay any tax or taxes which may be payable in respect of any transfer involved in the issuance or delivery of any certificates representing Warrant Stock in a name other than that of the Holder in respect to which such shares are issued.

4.  Adjustment of Warrant Price and Number of Shares Issuable Upon Exercise . The Warrant Price and the number of shares of Warrant Stock that may be purchased upon exercise of this Warrant shall be subject to adjustment from time to time as set forth in this Section 4 . The Issuer shall give the Holder notice of any event described below which requires an adjustment pursuant to this Section 4 in accordance with the notice provisions set forth in Section 5 .

(a)  Recapitalization, Reorganization, Reclassification, Consolidation, Merger or Sale .

(i) In case the Issuer after the Original Issue Date shall do any of the following (each, a “ Triggering Event ”): (a) consolidate or merge with or into any other Person and the Issuer shall not be the continuing or surviving Person of such consolidation or merger, or (b) permit any other Person to consolidate with or merge into the Issuer and the Issuer shall be the continuing or surviving Person but, in connection with such consolidation or merger, any Capital Stock of the Issuer shall be changed into or exchanged for Securities of any other Person or cash or any other property, or (c) transfer all or substantially all of its properties or assets to any other Person, or (d) effect a capital reorganization or reclassification of its Capital Stock, then, and in the case of

each such Triggering Event, proper provision shall be made to the Warrant Price and the number of shares of Warrant Stock that may be purchased upon exercise of this Warrant so that, upon the basis and the terms and in the manner provided in this Warrant, the Holder of this Warrant shall be entitled upon the exercise hereof at any time after the consummation of such Triggering Event, to the extent this Warrant is not exercised prior to such Triggering Event, to receive at the Warrant Price as adjusted to take into account the consummation of such Triggering Event, in lieu of the Common Stock issuable upon such exercise of this Warrant prior to such Triggering Event, the Securities, cash and property to which such Holder would have been entitled upon the consummation of such Triggering Event if such Holder had exercised the rights represented by this Warrant immediately prior thereto (including the right of a shareholder to elect the type of consideration it will receive upon a Triggering Event), subject to adjustments (subsequent to such corporate action) as nearly equivalent as possible to the adjustments provided for elsewhere in this Section 4 . Immediately upon the occurrence of a Triggering Event, the Issuer shall notify the Holder in writing of such Triggering Event and provide the calculations in determining the number of shares of Warrant Stock issuable upon exercise of the new warrant and the adjusted Warrant Price. Upon the Holder’s request, the continuing or surviving Person as a result of such Triggering Event shall issue to the Holder a new warrant of like tenor evidencing the right to purchase the adjusted number of shares of Warrant Stock and the adjusted Warrant Price pursuant to the terms and provisions of this Section 4(a)(i) . Notwithstanding the foregoing to the contrary, this Section 4(a)(i) shall only apply if the surviving entity pursuant to any such Triggering Event has a class of equity securities registered pursuant to the Securities Exchange Act of 1934, as amended, and its common stock is listed or quoted on a national securities exchange, national automated quotation system or the OTC Bulletin Board. In the event that the surviving entity pursuant to any such Triggering Event is not a public company that is registered pursuant to the Securities Exchange Act of 1934, as amended, or its common stock is not listed or quoted on a national securities exchange, national automated quotation system or the OTC Bulletin Board, then the Holder shall have the right to demand that the Issuer pay to the Holder an amount in cash equal to the value of this Warrant calculated in accordance with the Black-Scholes formula.

(ii) In the event that the Holder has elected not to exercise this Warrant prior to the consummation of a Triggering Event, so long as the surviving entity pursuant to any Triggering Event is a company that has a class of equity securities registered pursuant to the Securities Exchange Act of 1934, as amended, and its common stock is listed or quoted on a national securities exchange, national automated quotation system or the OTC Bulletin Board, the surviving entity and/or each Person (other than the Issuer) which may be required to deliver any shares of Warrant Stock (including all Securities, cash or property) upon the exercise of this Warrant as provided herein shall assume, by written instrument delivered to, and reasonably satisfactory to, the Holder of this Warrant, (A) the obligations of the Issuer under this Warrant (and if the Issuer shall survive the consummation of such Triggering Event, such assumption shall be in addition to, and shall not release the Issuer from, any continuing obligations of the Issuer under this Warrant) and (B) the obligation to deliver to such Holder such Securities, cash or property as, in accordance with the foregoing provisions of this subsection (a) .

(b)  Stock Dividends, Subdivisions and Combinations . If at any time the Issuer shall:

(i) make or issue or set a record date for the holders of the Common Stock for the purpose of entitling them to receive a dividend payable in, or other distribution of, shares of Common Stock,

(ii) subdivide its outstanding shares of Common Stock into a larger number of shares of Common Stock, or

(iii) combine its outstanding shares of Common Stock into a smaller number of shares of Common Stock, then (1) the number of shares of Common Stock for which this Warrant is exercisable immediately after the occurrence of any such event shall be adjusted to equal the number of shares of Common Stock which a record holder of the same number of shares of Common Stock for which this Warrant is exercisable immediately prior to the occurrence of such event would own or be entitled to receive after the happening of such event, and (2) the Warrant Price then in effect shall be adjusted to equal (A) the Warrant Price then in effect multiplied by the number of shares of Common Stock for which this Warrant is exercisable immediately prior to the adjustment divided by (B) the number of shares of Common Stock for which this Warrant is exercisable immediately after such adjustment.

(c)  Certain Other Distributions . If at any time the Issuer shall make or issue or set a record date for the holders of the Common Stock for the purpose of entitling them to receive any dividend or other distribution of:

(i) cash,

(ii) any evidences of its indebtedness, any shares of stock of any class or any other Securities or property of any nature whatsoever (other than cash, Common Stock Equivalents or Additional Shares of Common Stock), or

(iii) any warrants or other rights to subscribe for or purchase any evidences of its indebtedness, any shares of stock of any class or any other securities or property of any nature whatsoever (other than cash, Common Stock Equivalents or Additional Shares of Common Stock), then (1) the number of shares of Common Stock for which this Warrant is exercisable shall be adjusted to equal the product of the number of shares of Common Stock for which this Warrant is exercisable immediately prior to such adjustment multiplied by a fraction (A) the numerator of which shall be the Per Share Market Value of Common Stock at the date of taking such record and (B) the denominator of which shall be such Per Share Market Value minus the amount allocable to one share of Common Stock of any such cash so distributable and of the fair value (as determined in good faith by the Board of Directors of the Issuer of any and all such evidences of indebtedness, shares of stock, other securities or property or warrants or other subscription or purchase rights so distributable, and (2) the Warrant Price then in effect shall be adjusted to equal (A) the Warrant Price then in effect multiplied by the number of shares of Common Stock for which this Warrant is exercisable immediately prior to the adjustment divided by (B) the number of shares of Common Stock for which this Warrant is exercisable immediately after such adjustment. A reclassification of the Common Stock (other than a change in par value, or from par value to no par value or from no par value to par value) into shares of Common Stock and shares of any other class of stock shall be deemed a distribution by the

Issuer to the holders of its Common Stock of such shares of such other class of stock within the meaning of this Section 4(c) and, if the outstanding shares of Common Stock shall be changed into a larger or smaller number of shares of Common Stock as a part of such reclassification, such change shall be deemed a subdivision or combination, as the case may be, of the outstanding shares of Common Stock within the meaning of Section 4(b) .

(d)  Warrant Price Adjustments . The Warrant Price shall be subject to adjustment from time to time as follows:

(i) (A) If the Issuer shall issue, after July 2, 2009 (the “ Purchase Date ”), any Additional Shares of Common Stock (as defined below) without consideration or for a consideration per share less than the Warrant Price in effect immediately prior to the issuance of such Additional Shares of Common Stock, the Warrant Price for this Warrant in effect immediately prior to each such issuance shall (except as otherwise provided in this Section 4(d)(i)) be adjusted concurrently with such issuance to a price determined by multiplying such Warrant Price by a fraction, the numerator of which shall be the number of shares of Common Stock outstanding and deemed issued pursuant to Section 4(d)(i)(E) immediately prior to such issuance plus the number of shares of Common Stock that the aggregate consideration received by this Issuer for