System and method for the detection of anatomic landmarks for total hip replacement
AssigneeSiemens Corporate Research, Inc.
InventorsGuo-Qing Wei, Jianzhong Qian, Helmuth Schramm
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Abstract
A system and method for automatically detecting anatomical landmarks in a radiographic image, preferably for total hip replacement applications, in accordance with the present invention, provides a region of interest of the image, and determines a first landmark in the region of interest by computing an intensity ridge map. A second landmark is determined in the region of interest based on a position and orientation of the first landmark, and measurements are performed on the image based on positions of the first and second landmarks.
Claims7
A method for automatically detecting anatomical landmarks in a radiographic image of a hip, comprising the steps of:
- providing a radiographic image of a pelvis region;
- generating an intensity ridge map to highlight ridges in one direction;
- determining a position of a leg in the image by employing a strongest ridge in the ridge map to approximate the leg orientation and position;
- determining inner contour lines of a femur of the leg in the image based on a position and orientation of the strongest vertical ridge;
- determining outer surface lines of the femur based on a position and orientation of the inner contour lines and the ridge map;
- determining points of maximum curvature on a femoral head of the femur and tracing the femoral head by employing the ridge map;
- determining a center of the femoral head;
- and
- selecting a prosthesis based on the inner contour lines, the points of maximum curvature and the center of the femoral head.
A method for automatically detecting anatomical landmarks in a radiographic image of a hip having a prosthesis, comprising the steps of:
- providing a radiographic image of a pelvis region;
- generating an intensity ridge map to highlight ridges in one direction;
- determining a position of a leg in the image by employing a strongest ridge in the ridge map to approximate the leg orientation and position;
- determining a boundary of the prosthesis in a femur of the leg in the image based on a position and orientation of the strongest ridge;
- determining a position of a femoral component head of the prosthesis by testing the boundary of the prosthesis in accordance with an expected shape;
- tracing an arcuate line of ilium by employing the position of the femoral component head;
- and
- performing measurements to determine a degree of wear and loosening of the prosthesis.
Dependencies are inferred from the claim text.