A method and apparatus for determining, in three dimensions, the location, size, depth and width of tumors, lesions, abnormalities, structures, and the like, particularly useful for stereotactic surgery. The invention utilizes several energy beams which, when they intersect, allow for such measurements...http://www.google.de/patents/US5354314?utm_source=gb-gplus-sharePatent US5354314 - Three-dimensional beam localization apparatus and microscope for stereotactic diagnoses or surgery mounted on robotic type arm
