Model-based tracking of the bones of the foot: A biplane fluoroscopy validation study.

Autor: Iaquinto JM; RR&D Center for Limb Loss and MoBility, Department of Veterans Affairs, Seattle, WA 98108, USA; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA., Kindig MW; RR&D Center for Limb Loss and MoBility, Department of Veterans Affairs, Seattle, WA 98108, USA., Haynor DR; Department of Radiology, University of Washington, Seattle, WA 98195, USA., Vu Q; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA., Pepin N; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA., Tsai R; RR&D Center for Limb Loss and MoBility, Department of Veterans Affairs, Seattle, WA 98108, USA., Sangeorzan BJ; RR&D Center for Limb Loss and MoBility, Department of Veterans Affairs, Seattle, WA 98108, USA; Department of Orthopaedics & Sports Medicine, University of Washington, Seattle, WA 98195, USA., Ledoux WR; RR&D Center for Limb Loss and MoBility, Department of Veterans Affairs, Seattle, WA 98108, USA; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA; Department of Orthopaedics & Sports Medicine, University of Washington, Seattle, WA 98195, USA. Electronic address: wrledoux@uw.edu.
Jazyk: angličtina
Zdroj: Computers in biology and medicine [Comput Biol Med] 2018 Jan 01; Vol. 92, pp. 118-127. Date of Electronic Publication: 2017 Nov 08.
DOI: 10.1016/j.compbiomed.2017.11.006
Abstrakt: Measuring foot kinematics using optical motion capture is technically challenging due to the depth of the talus, small bone size, and soft tissue artifact. We present a validation of our biplane X-ray system, demonstrating its accuracy in tracking the foot bones directly. Using an experimental linear/rotary stage we imaged pairs of tali, calcanei, and first metatarsals, with embedded beads, through 30 poses. Model- and bead-based algorithms were employed for semi-automatic tracking. Translational and rotational poses were compared to the experimental stage (a reference standard) to determine registration performance. For each bone, 10 frames per pose were analyzed. Model-based: The resulting overall translational bias of the six bones was 0.058 mm with a precision of ± 0.049 mm. The overall rotational bias of the six bones was 0.42° with a precision of ± 0.41°. Bead-based: the overall translational bias was 0.037 mm with a precision of ± 0.032 mm and for rotation was 0.29° with a precision of ± 0.26°. We validated the accuracy of our system to determine the spatial position and orientation of isolated foot bones, including the talus, calcaneus, and first metatarsal over a range of quasi-static poses. Although the accuracy of dynamic motion was not assessed, use of an experimental stage establishes a reference standard.
(Published by Elsevier Ltd.)
Databáze: MEDLINE
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