Patent ID: 8078254
Filing Date: 2011-12-13
Classification: A61B,A61F

Abstract:
1. A method for providing, without using a patient tracker, a patient-specific pelvic coordinate system from a single near AP intra-operative image of the patient, said method comprising: forming a single intra-operative fluoroscopic image of the patient's pelvis in the near AP direction using an x-ray source; defining first and second landmarks on anatomically separated regions of said pelvis on said image, said landmarks being separated from each other in at least an anterior-posterior direction; determining the transaxial displacement of said landmarks on said image; determining the axial displacement of said landmarks on said image; calculating by a processor the axial rotation of the pelvis using the transaxial displacement as a measure of the axial rotation of said pelvis with respect to the plane of said image, and calculating by a processor the transaxial rotation of the pelvis using said axial displacement as a measure of the transaxial rotation of said pelvis with the respect to the plane of said image.