Shlomo Ben Haim, Zeev Weinfeld, Assaf Govari: X-ray guided surgical location system with extended mapping volume. Audley A Ciamporcero Jr, November 22, 2001: US20010044578-A1

Apparatus for X-ray guided surgery, including a reference element (20), which is placed in contact with the body (32) of a subject. The element includes a plurality of fiducial marks (22a, 22b, 22c) and a first coordinate sensing device (24), in predetermined, fixed positions in the element (20). A ...