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학술대회자료
저자정보
오정석 (한국과학기술원) 윤승우 (한국과학기술원) 구승범 (한국과학기술원)
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2022년 학술대회
발행연도
2022.11
수록면
686 - 689 (4page)

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Bi-planar fluoroscopic (BPF) image processing has been widely used for measuring the skeletal kinematics of several joints. The procedure of estimating the 3-dimensional (3D) kinematics from 2-dimensional (2D) BPF images is called 2D-3D registration. The reconstruction of the subject-specific bone geometry is essential in 2D-3D registration. The studies to find the bone geometry without using the CT scans which automatically estimate the shape as well as the pose were investigated. In this study, we propose the reconstruction of the distal femur by using a series of BPF images and a statistical shape and intensity model and checked the effect of the number of frames to be used for the optimization of the accuracy of the reconstruction. Three CT scans of cadaveric knee joints were prepared to quantify the accuracy of reconstruction. The cadaveric knee joints were adjusted to simulate knee flexion while the fluoroscopic imaging system was taking the X-ray images. For every time stamp, both bi-planar images were synchronized and calibrated. The Hausdorff distance between the reconstructed bone and ground-truth bone was used for representing the accuracy of the reconstruction. While the number of frames to be used for the reconstruction was changed, the Hausdorff distance was compared. The accuracy of reconstruction decreased when using a larger number of frames and reached 4.23±0.53 mm on average when using 6 frames of BPF image pairs.

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Abstract
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2. 이론 및 실험
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4. 결론
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