X線単面投影像による人工膝関節の三次元位置・姿勢推定に関する研究 : CCD画像による実験的検証(機械力学,計測,自動制御)

概要

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This paper deals with the measurement of 3D motion from 2D perspective projections of knee proshesis. Our previous study of computer model simulation has demonstrated that the technique archived sufficient accuracies of position/orientation estimation for knee prosthesis. Then we applied our algorithm to the CCD images, thereby examining the effects of various artifacts possibly incorporated through a photographing process on the estimation accuracies. A pilot study was performed such that the femoral/tibial component was set on a six-degree motion positioner, its single projection image was taken, and position/orientation estimation was carried out. We found that estimation accuracies in the experiment were deteriorated mainly by the geometric discrepancies between the actual and computer models and by the special inconsistencies between the coordinate axes of positioner and that of computer model. Yet, we verified that our algorithm could achieve proper and consistent estimation even for the CCD images. Thus we believe our technique would be applied to a clinical usage successfully by solving the above-mentioned problems.
社団法人日本機械学会の論文
2003-11-25