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Accuracy of smartphone video for contactless measurement of hand tremor frequency

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journal contribution
posted on 22.10.2020, 09:27 by Stefan Williams, Hui FangHui Fang, Samuel D Relton, David C Wong, Taimour Alam, Jane E Alty
Background Computer vision can measure movement from video without the time and access limitations of hospital accelerometry / electromyography, or the requirement to hold or strap a smartphone accelerometer.
Objective To compare computer vision measurement of hand tremor frequency from smartphone video with a gold standard measure, accelerometer.
Methods 37 smartphone videos of hands at rest and in posture, were recorded from 15 participants with tremor diagnoses (9 Parkinson’s, 5 Essential Tremor, 1 Functional Tremor). Video pixel movement was measured using the computing technique of optical flow, with contemporaneous accelerometer recording. Fast Fourier Transform and Bland-Altman analysis were applied. Tremor amplitude was scored by two clinicians.
Results Bland-Altman analysis of dominant tremor frequency from smartphone video compared with accelerometer showed excellent agreement: 95% limits of agreement -0.38 Hz to +0.35Hz. In 36 out of 37 videos (97%) there was <0.5 Hz difference between computer vision and accelerometer measurement. There was no significant correlation between the level of agreement and tremor amplitude.
Conclusion The study suggests a potential new, contactless ‘point and press’ measure of tremor frequency within standard clinical settings or telemedicine.

Funding

grant funding from National Institute for Health Research (NIHR)

History

School

  • Science

Department

  • Computer Science

Published in

Movement Disorders Clinical Practice

Volume

8

Issue

1

Pages

69-75

Citation

Williams, S. ... et al., (2020). Accuracy of smartphone video for contactless measurement of hand tremor frequency. Movement Disorders Clinical Practice, doi:10.1002/mdc3.13119.

Publisher

Wiley

Version

AM (Accepted Manuscript)

Rights holder

© International Parkinson and Movement Disorder Society

Publisher statement

This is the peer reviewed version of the following article: Williams, S. ... et al., (2020). Accuracy of smartphone video for contactless measurement of hand tremor frequency. Movement Disorders Clinical Practice, 8(1), pp. 69-75, which has been published in final form at https://doi.org/10.1002/mdc3.13119. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions

Acceptance date

20/10/2020

Publication date

2020-12-28

Copyright date

2021

ISSN

2330-1619

Language

en

Depositor

Dr Hui Fang . Deposit date: 20 October 2020