3次元パラメトリックモデルと複数X線投影像を用いた股関節の形状復元 3 D reconstruction of a femoral shape using a parametric model and two 2 D radiographs

One of radical cures of hip joint diseases is a replacement operation to an artificial hip joint. In general,the preoperative examination is indispensable for this operation in order to determine an adequate shape of an artificial hip joint. A patient usually receives Computed Tomography(CT) examination to obtain a preoperative 3D shape of a patient’s joint. However,radiation exposure by CT scan is much higher than the one by radioscopy,which is typically used for a diagnosis of osseous anomalies. This papaer proposes a method to estimate a 3D shape of patient’s femur from two radiographs and a parametric femoral model. Firstly,we develop the parametric femoral model utilizing statistical procedure of 3D femoral two 2D images using a distance map constructed by the Level Set Method. Experiments using synthesized images are carrried out to verify the fundamental performance of the proposed technique.

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