Patent ID: 8275445

Claim:
A system for determining a position of an instrument in a procedure, comprising: an electromagnetic position detection system comprising a transmitter that creates an electromagnetic field; an x-ray device having a C-arm, an x-ray source, and an x-ray detector that distorts the electromagnetic field; a position sensor of the electromagnetic position detection system arranged on the C-arm that determines a position of the x-ray device in the electromagnetic field; and a further position detection system for determining positions of the C-arm, the x-ray source, and the x-ray detector, wherein the further position detection system comprises: optical markers arranged on the C-arm, the x-ray source, and the x-ray detector, and a camera that records the positions of the optical markers, wherein the electromagnetic position detection system is configured to determine the position of the instrument based on the position of the x-ray device in the electromagnetic field and the distortion of the electromagnetic field.