Abstract
Many of the 2D/3D registration for joint use 3D bone model obtained by MRI and CT. Making a bone model only use the X-ray image (lateral view) contribute to reducing the cost and exposure dose of X-ray. We have developed the reconstruction methods of subject's 3D bone model from X-ray lateral image and prepared 3D bone model that consists of voxels. In this study, the proposal method was adopted to the cervical spine. Using the 3D bone models made from CT and 3D bone model that was reconstructed the proposed method, template pattern matching was carried out, and the accuracy of pose estimation was compared. Estimation accuracy of the proposed method was θ_x=2.60±2.00deg, θ_y=1.68±1.43deg. Estimation accuracy of the conventional method was θ_x=0.36±0.13deg, θ_y=0.83±0.44deg. Because the present method is to modify the prepared 3D bone model based on only lateral X-ray image, bone shape, especially about the depth direction, cannot exactly reflect subject's bone shape. The method can't reproduction the bone shape with a recessed shape, such as bottom of vertebral body. These problems affect the estimation accuracy.
