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Accuracy of smartphone video for contactless measurement of hand tremor frequency

Williams, S, Fang, H, Relton, SD, Wong, DC, Alam, T and Alty, JE ORCID: 0000-0002-5456-8676 2021 , 'Accuracy of smartphone video for contactless measurement of hand tremor frequency' , Movement Disorders Clinical Practice, vol. 8, no. 1 , 69–75 , doi: 10.1002/mdc3.13119.

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Background: Computer vision can measure movement from video without the time and accesslimitations of hospital accelerometry/electromyography or the requirement to hold or strap a smartphoneaccelerometer.Objective: To compare computer vision measurement of hand tremor frequency from smartphone video with agold standard measure accelerometer.Methods: A total of 37 smartphone videos of hands, at rest and in posture, were recorded from 15 participantswith tremor diagnoses (9 Parkinson’s disease, 5 essential tremor, 1 functional tremor). Video pixel movementwas 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 2 clinicians.Results: Bland-Altman analysis of dominant tremor frequency from smartphone video compared withaccelerometer showed excellent agreement: 95% limits of agreement −0.38 Hz to +0.35 Hz. In 36 of 37 videos(97%), there was Conclusion: The study suggests a potential new, contactless point-and-press measure of tremor frequencywithin standard clinical settings, research studies, or telemedicine.

Item Type: Article
Authors/Creators:Williams, S and Fang, H and Relton, SD and Wong, DC and Alam, T and Alty, JE
Keywords: parkinson's, computer visions, smartphone, tremor, dystonia, essential tremor, functional tremor
Journal or Publication Title: Movement Disorders Clinical Practice
Publisher: John Wiley & Sons, Inc.
ISSN: 2330-1619
DOI / ID Number: 10.1002/mdc3.13119
Copyright Information:

© 2020 International Parkinson and Movement Disorder Society

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