X線透視画像を用いた人工膝関節の三次元動態解析システムの開発

概要

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To achieve quantitative assessment of 3D dynamic motion of artificial knee implants under clinical con- ditions, we developed a 3D kinematic analysis system using X-ray fluoroscopic imaging. The 3D pose-estimation technique fpr.knee implants was built on a 2D/3D registration algorithm, which .determines the spatial pose for each .femoral and tibial component from the knee implant contours and cdmputer^assisted design ((DAD) models of the.'implant. In order, to validate the accuracy of the 3D pose, estimation and the system, computersimulationand in'vitro'tests were'performed using images of knee implants taken in 10 different poses with respect to X-ray focus. Computer simulation tests showed that the root mean square errors (RMSE) for all variables were less than I'.O'mm 1.0°. In vitro tests showed that the RMSE for trans- lation perpendicular to the X-ray image plane was about 1.5 mm, while the accuracy of the remaining two translational and three rotational variables wasifound to be sufficient for analyzing knee kinematics. Com- putation time in 3D pose estimation was then obtained in less than 30 seconds for each frame. In clinical application, dynamic movement in deep knee bending was quantitatively analyzed, and the feasibility and effectiveness of the system was demonstrated.
社団法人日本放射線技術学会の論文
2005-01-20