Exhibit 2.4

PLAN OF MERGER

      THIS PLAN OF MERGER (this “ Plan ”), dated as of October 9, 2009 (the “ Execution Date ”), is entered into by and among CASTILLO, INC., a Delaware corporation (“ Parent ”) and TECHNISCAN, INC., a Utah corporation and wholly-owned subsidiary of Parent (“ Subsidiary ”).

      WHEREAS , the Board of Directors of Parent, and the sole stockholder of Subsidiary, have determined that it is advisable and in the best interests of Parent and Subsidiary that Subsidiary merge with and into Parent upon the terms and subject to the conditions herein provided, and have approved this Plan.

      WHEREAS , the Board of Directors of Subsidiary has determined that it is advisable and in the best interests of Subsidiary that it merge with and into Parent upon the terms and subject to the conditions herein provided, and have approved this Plan.

      NOW, THEREFORE , in consideration of the covenants, promises and representations set forth herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby expressly and mutually acknowledged, and intending to be legally bound hereby, the parties hereto agree as follows:

ARTICLE I
THE MERGER

     1.1 Merger . Upon the terms and subject to the conditions set forth in this Plan, at the Effective Time (as defined below), Subsidiary shall be merged with and into Parent (the “ Merger ”), the separate existence of Subsidiary shall cease and Parent shall be the corporation surviving the Merger (hereinafter referred to as the “ Surviving Corporation ”), which shall continu