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System for Determining the Orientation of a Bone Implanted Post
A method for determining an orientation of a base to which a fiducial marker is detachably mounted. The method includes the steps of determining the axis of symmetry for the fiducial marker and choosing the determined axis of symmetry of the fiducial marker as the axis of symmetry of the base.
U.S. Patent # 7,646,899: Apparatus and methods of determining marker orientation in fiducial registration
Inventors:J Michael Fitzpatrick