A system for use during a medical or surgical procedure on a body. The system generates an image representing the position one or more body elements during the procedure using scans generated by a scanner prior or during the procedure. The image data set has reference points for each of the body elements,...http://www.google.com.au/patents/US6236875?utm_source=gb-gplus-sharePatent US6236875 - Surgical navigation systems including reference and localization frames
