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Main Title: A Tangible Solution for Hand Motion Tracking in Clinical Applications
Author(s): Salchow-Hömmen, Christina
Callies, Leonie
Laidig, Daniel
Valtin, Markus
Schauer, Thomas
Seel, Thomas
Type: Article
Language Code: en
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.
Issue Date: 8-Jan-2019
Date Available: 20-Feb-2019
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): inertial sensor
inertial measurement unit
real-time motion tracking
hand tracking
magnetic disturbances
dual quaternions
hand and finger kinematics
functional electrical stimulation
Sponsor/Funder: DFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlin
Journal Title: Sensors
Publisher: MDPI
Publisher Place: Basel
Volume: 19
Issue: 1
Article Number: 208
Publisher DOI: 10.3390/s19010208
EISSN: 1424-8220
Appears in Collections:FG Regelungssysteme » Publications

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