骨密度情報に基づくX線透過シミュレーションによる生体関節動態解析手法の開発(機械力学,計測,自動制御)

概要

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For the operative method and evaluation of patients, it is important to clarify three-dimensional kinematics of the natural joint. The study aimed to develop a three-dimensional motion analysis for natural knee joints in vivo, using an image matching technique with a high-resolution flat panel detector (FPD). Technique was semi-automatically performed by superimposing the three-dimensional gray-scale model that was reconstructed in beforehand computer on the actual X-ray images. Three-dimensional gray-scale model of the natural knee joint were reconstructed using computed tomography (CT) data. The reconstructed image was moved on a computer so that it could be matched to actual X-ray images. However, the number of pixels in a whole reconstructed image was so huge. Therefore, in this study, several small windows were set up, in which a region of interest was determined to calculate instead of viewing the whole region of the image. The accuracy of the motion analytic method for the natural knee joint was confirmed using some X-ray images taken experimentally. High correlation was observed between the X-ray images and the computational simulating image. The motion analytic method we proposed was a very useful tool for measuring the six-degree-of-freedom (6-DOF) motion of natural kness in vivo.
2009-07-25