Seeing the unseen: Could Eulerian video magnification aid clinician detection of subclinical Parkinson's tremor?

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
Stefan WilliamsJane E Alty

Abstract

Eulerian magnification amplifies very small movements in video, revealing otherwise invisible motion. This raises the possibility that it could enable clinician visualisation of subclinical tremor using a standard camera. We tested whether Eulerian magnification of apparently atremulous hands reveals a Parkinsonian tremor more frequently in Parkinson's than in controls. We applied Eulerian magnification to smartphone video of 48 hands that appeared atremulous during recording (22 hands from 11 control participants, 26 hands from 17 idiopathic Parkinson's participants). Videos were rated for Parkinsonian tremor appearance (yes/no) before and after Eulerian magnification by three movement disorder specialist neurologists. The proportion of hands correctly classified as Parkinsonian or not by clinicians was significantly higher after Eulerian magnification (OR = 2.67; CI = [1.39, 5.17]; p < 0.003). Parkinsonian-appearance tremors were seen after magnification in a number of control hands, but the proportion was greater in the Parkinson's hands. Eulerian magnification slightly improves clinician ability to identify apparently atremulous hands as Parkinsonian. This suggests that some of the apparent tremor revealed may be subclinica...Continue Reading

References

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Sep 23, 2018·Journal of Neurology·Stefan WilliamsChristopher D Graham
Dec 31, 2019·Clinical Neurophysiology Practice·Felipe VialMark Hallett
Jul 10, 2020·Journal of the Neurological Sciences·Stefan WilliamsJane E Alty

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