EXHIBIT 10.18


                        AMENDMENT TO EMPLOYMENT AGREEMENT



     This Amendment ("Amendment") to the Employment Agreement ("Agreement"),
dated as of July 1, 1996, between Image Guided Technologies, Inc., a Colorado
corporation (the "Company"), and Jeffrey J. Hiller ("Hiller"), is entered into
as of September 6, 1996.

     1.   Section 2 of the Agreement is hereby amended by changing the first
sentence thereof to read in full as follows:

          Subject to earlier termination as provided in Section 5, the
          employment hereunder shall be for a period of thirty months,
          commencing on July 1, 1996 (the "Commencement Date") and ending on
          December 31, 1998.

     2.   All other terms and conditions of the Agreement shall remain in full
force and effect.

                                   IMAGE GUIDED TECHNOLOGIES, INC.



                                   By: /s/ Robert E. Silligman
                                       --------------------------------------
                                       Robert E. Silligman


                                       /s/ Jeffrey J. Hiller
                                       --------------------------------------
                                       Jeffrey J. Hiller