Patent ID: 7065393

Claim:
A method of calibrating a C-arm imaging device comprising the steps of: determining a position of an imaging source for each of a plurality of orientations of the C-arm, including determining a reference position of the imaging source for a reference orientation; determining a position of an imaging receptor for each of the plurality of orientations, including determining a reference position of the imaging receptor for the reference orientation; determining a local gravity vector for each of the plurality of orientations; determining an imaging source focal point displacement due to bending for each of the plurality of orientations using the reference position of the imaging source, the reference position of the imaging receptor, the position of the imaging source and the position of the imaging receptor in correspondence to the local gravity vector; and storing information on the position of the imaging source, the position of the imaging receptor, the gravity vector, and the imaging source focal point displacement for each of the plurality of orientations, for use in subsequent interpolation of imaging source focal point displacement based on a specific position of an imaging receptor and a specific local gravity vector.