An image guided navigation system for navigating a region of a patient includes an imaging device, a tracking device, a controller, and a display. The imaging device generates images of the region of a patient. The tracking device tracks the location of the instrument in a region of the patient. The...http://www.google.ca/patents/US20040097805?utm_source=gb-gplus-sharePatent US20040097805 - Navigation system for cardiac therapies
