On the accuracy of low-cost motion capture systems for range of motion measurements

Kevin Yu, Roghayeh Barmaki, Mathias Unberath, Albert Mears, Joseph Brey, Tae Hwan Chung, Nassir Navab

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we study low-cost motion tracking systems for range of motion (RoM) measurements in the tele-rehabilitation context using Augmented Reality. We propose simple yet effective extensions of the Microsoft Kinect SDK 2.0 skeleton tracking algorithm. Our extensions consist of temporal smoothing of the joint estimates as well as an intuitive, patient-specific adjustment of the bone lengths that is implemented as a quick, one-Time calibration performed by the therapist. We compare our system to the Kinect v1, the non-modified Kinect v2, a marker-based optical tracking system, and the clinical gold standard set by two subject-matter-experts using a goniometer. We study the accuracy of all systems in RoM measurement on the elbow joints. We quantitatively compare angular deviation from the expert measurements and perform analysis on statistical confidence. The results indicate, that the proposed personalized setup substantially outperforms all competing systems and effectively corrects for the systematic error of the skeleton tracking, particularly at full flexion. The improved system matched the observations of both experts with a mean error of 3:78° We conclude, that the proposed, personalized method for RoM measurement with Augmented Reality feedback is promising for tele-rehabilitation scenarios. Future work will investigate whether similar strategies can be applied to more complex joints, such as the shoulder.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2018
Subtitle of host publicationImaging Informatics for Healthcare, Research, and Applications
EditorsPo-Hao Chen, Jianguo Zhang
PublisherSPIE
ISBN (Electronic)9781510616479
DOIs
StatePublished - 2018
EventMedical Imaging 2018: Imaging Informatics for Healthcare, Research, and Applications - Houston, United States
Duration: Feb 13 2018Feb 15 2018

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume10579
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2018: Imaging Informatics for Healthcare, Research, and Applications
Country/TerritoryUnited States
CityHouston
Period2/13/182/15/18

Keywords

  • Goniometer
  • Kinect
  • Optical tracker
  • Polaris Vicra
  • RoM
  • Tele-rehabilitation
  • Vicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Fingerprint

Dive into the research topics of 'On the accuracy of low-cost motion capture systems for range of motion measurements'. Together they form a unique fingerprint.

Cite this