J0230402 2方向X線画像と3次元骨形状モデルを用いた下腿部と足部における皮膚マーカの誤差評価

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  • J0230402 Evaluation of skin marker artefact on shank and foot using bi-plane radiography and 3D bone models

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Motion capture systems estimate underlying bone movements by tracking trajectories of skin-mounted markers. However, the reliability of the kinematics parameters derived from the skin markers has often questioned due to skin movement artefact. The objective of this study was to evaluate skin movement artefact associated with dorsiflexion and plantar flexion of the foot using 3D bone models and bi-plane radiography. Four healthy subjects participated in this study. The subject underwent CT scan to reconstruct 3D tibial, the first metatarsal bone, and the fifth metatarsal bone models. Sixteen polymeric markers with radio-opaque beads in its center were attached to the shank and foot. To quantify the skin marker movement with respect to the tibia, the first metatarsal bone, and fifth metatarsal bone, bi- plane radiographic images were collected during neutral, plantar flexion, and dorsiflexion of the foot. The positions of the tibia, the first metatarsal bone, and the fifth metatarsal bone were recovered by a 2D to 3D image registration method. Then the positions of the markers were determined with respect to the relevant coordinate system embedded in the 3D bone models. The mean values ± SD of the translations in the corresponding markers with plantar flexion were 3.1 ± 1.8 mm for the tibia, 8.2 ± 4.2 mm for the first metatarsal bone, and 14.0 ± 6.3 mm for the fifth metatarsal bone. With dorsiflexion, the translations were 6.0 ± 3.1 mm for the tibia, 18.1 ±6.4 mm for the first metatarsal bone, and 36.0 ±12.8 mm for the fifth metatarsal bone.

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  • 年次大会

    年次大会 2015 (0), _J0230402--_J0230402-, 2015

    一般社団法人 日本機械学会

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