二方向同時X線撮影によるせき柱形状解析 : 第3報, つい骨配置の解析精度

概要

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According to the development of treatment of spinal deformity, information of the accurate three dimensional configuration of vertebra is needed. The accuracy of the measured locations and rotational angles by the developed photogrammetric system is studied. Errors are classified into three factors : The first is on the accuracy of the three dimensional reconstruction of location from two X-ray films. It is defined by the reference frame, calibration markers and reading of the landmarks using a digitizer. The second is on the calculating accuracy of a personal computer. This affects especially the calculated result of rotational angles. The third is on the identification accuracy of bony landmarks. They are recognized not as the point but as the region where the bone density is higher than the adjacent portion. The results show that the overall accuracies of the system are 1.5 mm on the location of the vertebral center, and 4゜ on the rotational angles of the vertebra.
一般社団法人日本機械学会の論文
1986-09-25