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Sensors 2019, 19(1), 208; https://doi.org/10.3390/s19010208

A Tangible Solution for Hand Motion Tracking in Clinical Applications

Control Systems Group, Technische Universität Berlin, Berlin 10587, Germany
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 21 November 2018 / Revised: 22 December 2018 / Accepted: 23 December 2018 / Published: 8 January 2019
(This article belongs to the Section Physical Sensors)
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Abstract

Objective real-time assessment of hand motion is crucial in many clinical applications including technically-assisted physical rehabilitation of the upper extremity. We propose an inertial-sensor-based hand motion tracking system and a set of dual-quaternion-based methods for estimation of finger segment orientations and fingertip positions. The proposed system addresses the specific requirements of clinical applications in two ways: (1) In contrast to glove-based approaches, the proposed solution maintains the sense of touch. (2) In contrast to previous work, the proposed methods avoid the use of complex calibration procedures, which means that they are suitable for patients with severe motor impairment of the hand. To overcome the limited significance of validation in lab environments with homogeneous magnetic fields, we validate the proposed system using functional hand motions in the presence of severe magnetic disturbances as they appear in realistic clinical settings. We show that standard sensor fusion methods that rely on magnetometer readings may perform well in perfect laboratory environments but can lead to more than 15 cm root-mean-square error for the fingertip distances in realistic environments, while our advanced method yields root-mean-square errors below 2 cm for all performed motions. View Full-Text
Keywords: inertial sensor; inertial measurement unit; real-time motion tracking; hand tracking; magnetic disturbances; dual quaternions; hand and finger kinematics; rehabilitation; functional electrical stimulation inertial sensor; inertial measurement unit; real-time motion tracking; hand tracking; magnetic disturbances; dual quaternions; hand and finger kinematics; rehabilitation; functional electrical stimulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Salchow-Hömmen, C.; Callies, L.; Laidig, D.; Valtin, M.; Schauer, T.; Seel, T. A Tangible Solution for Hand Motion Tracking in Clinical Applications. Sensors 2019, 19, 208.

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