Journal
SENSORS
Volume 22, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/s22062385
Keywords
head tremor amplitude; head tremor frequency; 2D video motion analysis; miniature wireless inertial magnetic motion unit; Fourier transform; wavelet transform
Funding
- Programme Hospitalier de Recherche Clinique from the French Health Ministry [PHRC-14-0058]
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This study compares two methods, video-based motion analysis and miniature wireless inertial magnetic motion unit (IMMU), to quantify the amplitude and frequency of head movements in patients with head tremor. The results show that the IMMU method is more sensitive in detecting changes in tremor amplitude and has better agreement with clinical measures.
This study compares two methods to quantify the amplitude and frequency of head movements in patients with head tremor: one based on video-based motion analysis, and the other using a miniature wireless inertial magnetic motion unit (IMMU). Concomitant with the clinical assessment of head tremor severity, head linear displacements in the frontal plane and head angular displacements in three dimensions were obtained simultaneously in forty-nine patients using one video camera and an IMMU in three experimental conditions while sitting (at rest, counting backward, and with arms extended). Head tremor amplitude was quantified along/around each axis, and head tremor frequency was analyzed in the frequency and time-frequency domains. Correlation analysis investigated the association between the clinical severity of head tremor and head linear and angular displacements. Our results showed better sensitivity of the IMMU compared to a 2D video camera to detect changes of tremor amplitude according to examination conditions, and better agreement with clinical measures. The frequency of head tremor calculated from video data in the frequency domain was higher than that obtained using time-frequency analysis and those calculated from the IMMU data. This study provides strong experimental evidence in favor of using an IMMU to quantify the amplitude and time-frequency oscillatory features of head tremor, especially in medical conditions.
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