TY - JOUR
T1 - Seeing the unseen: could Eulerian video magnification aid clinician detection of subclinical Parkinson’s tremor ?
AU - Williams, Stefan
AU - Fang, Hui
AU - Relton, Samuel D.
AU - Graham, Christopher D.
AU - Alty, Jane E.
PY - 2020/10/2
Y1 - 2020/10/2
N2 -
Introduction
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 a tremulous hands reveals a Parkinsonian tremor more frequently in Parkinson’s than in controls.
Method
We applied Eulerian magnification to smartphone video of 48 hands that appeared a tremulous 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.
Results
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.
Conclusion
Eulerian magnification slightly improves clinician ability to identify apparently a tremulous hands as Parkinsonian. This suggests that some of the apparent tremor revealed may be subclinical Parkinson’s (pathological) tremor, and Eulerian magnification may represent a first step towards contactless visualisation of such tremor. However, the technique also reveals apparent tremor in control hands. Therefore, our method needs additional elaboration and would not be of direct clinical use in its current iteration.
AB -
Introduction
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 a tremulous hands reveals a Parkinsonian tremor more frequently in Parkinson’s than in controls.
Method
We applied Eulerian magnification to smartphone video of 48 hands that appeared a tremulous 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.
Results
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.
Conclusion
Eulerian magnification slightly improves clinician ability to identify apparently a tremulous hands as Parkinsonian. This suggests that some of the apparent tremor revealed may be subclinical Parkinson’s (pathological) tremor, and Eulerian magnification may represent a first step towards contactless visualisation of such tremor. However, the technique also reveals apparent tremor in control hands. Therefore, our method needs additional elaboration and would not be of direct clinical use in its current iteration.
U2 - 10.1016/j.jocn.2020.09.046
DO - 10.1016/j.jocn.2020.09.046
M3 - Article
VL - 81
SP - 101
EP - 104
JO - Journal of Clinical Neuroscience
JF - Journal of Clinical Neuroscience
SN - 0967-5868
ER -