A frameless stereotaxis skull fiducial marker system uses custom-formed mouthpieces fitted to maxillary and mandibular teeth. A relatively thick medial portion of a tapered U-shaped bar is attached to a forward projecting connector on a mouthpiece. Thin distal ends of the rigid U-shaped bar support fiducial...http://www.google.es/patents/US6096048?utm_source=gb-gplus-sharePatente US6096048 - Noninvasive, reattachable skull fiducial marker system
Noninvasive, reattachable skull fiducial marker system