Wireless hand tremor measurement system
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Date
2017-06
Authors
Goh, Chong Teik
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Abstract
Observational tremor rating scales that can be used to assess the level of tremor of patients based on the type of disease suffered by the patients such as Movement Disorder Society sponsored Unified Parkinson’s Diseases Rating Scale (MDS-UPDRS) and The Essential Tremor Rating Assessment Scale (TETRAS). Doctors employed observational tremor rating scales to assess the level of tremor of patients especially of the upper extremities. For example, MDS-UPDRS uses discrete integer score from 0 to 4 to indicate the severity of the assessed type of tremor such as resting, postural and kinetic tremor for patients who suffered from Parkinson’s disease. Score 0 means that the subject suffered no tremor whereas score 4 indicates that the subject suffered from severe tremor with amplitude at least 10 cm. Subjectivity is one of the problem when rating is based on human observation. One way to overcome this is to use a sensor-based hand tremor measurement system. A wireless hand tremor measurement system using inertial measurement unit (IMU) with on-board attitude and heading reference system (AHRS) is developed to measure hand tremor. The wireless hand tremor measurement system provides measurement results that can quantify and classify the tremor motion in terms of relative joint angular displacement which can be further used to classify the tremor direction of the hand such as pronation-supination, flexion-extension and abduction-adduction. The system is tested with in-laboratory hand tremor simulator. 20 samples of simulated hand tremor data is obtained in root-mean-squared value. The test-retest reliability result showed that the system has correlation coefficient of 0.994 and standard error of measurement (SEM) of 0.006 . The validation results showed that correlation coefficient of the system and the encoder system from the hand tremor simulator is 0.985 with mean of difference of 0.020 .