A system for positioning and repositioning of a portion of a patient's body with respect to a treatment or imaging machine includes multiple cameras to view the body and the machine. Index markers, either light-emitting, passive, geometric shapes, or natural landmarks, are identified and located by the...http://www.google.fr/patents/US20020065461?utm_source=gb-gplus-shareBrevet US20020065461 - Surgical positioning system
