A method of navigating the distal end of a medical device through an operating region in a subject's body includes displaying an x-ray image of the operating region, including the distal end of the medical device; determining the location of the distal end of the medical device in a reference frame translatable...http://www.google.de/patents/US7248914?utm_source=gb-gplus-sharePatent US7248914 - Method of navigating medical devices in the presence of radiopaque material
