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Accuracy of smartphone video for contactless measurement of hand tremor frequency

journal contribution
posted on 22.10.2020, 09:27 by Stefan Williams, Hui 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

Citation

Williams, S. ... et al., (2020). Accuracy of smartphone video for contactless measurement of hand tremor frequency. Movement Disorders Clinical Practice, In Press.

Publisher

Wiley

Version

AM (Accepted Manuscript)

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, In Press, which has been published in final form at [Link to final article using the DOI]. 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

ISSN

2330-1619

Language

en

Depositor

Dr Hui Fang . Deposit date: 20 October 2020

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