A wireless sensor network system for monitoring electroencephalogram alpha band
- VernacularTitle:监测脑电α波的无线传感器网络系统
- Author:
Jun JI
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2008;12(13):2587-2590
- CountryChina
- Language:Chinese
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Abstract:
BACKGROUND: Clinical study of insomnia is performed by monitoring the alpha wave of the brain signals with the polysomnography (PSG). PSG has two deficiencies in recording electroencephalogram (EEG): ①The testee is wrapped by long electrode wires so that they cannot sleep normally. As a result, the testee's mental and physical status is affected and the results are inaccurate. ②As the alpha wave consists of very weak biomedical signals, it is easily affected by the alternating current (AC) interference, so that the analytical software cannot identify the desired signals. For these reasons, a monitoring system that overcomes such deficiencies is needed. OBJECTIVE: To design a wireless EEG sensors system for detecting brain signals. It can obtain the brain signals in an accurate and non-disturbed way without affecting the testee's mental and physical status. DESIGN: The actual application circuit was implemented after analyzing and building the circuit model. SETTING: The 305 Hospital of Chinese PLA.MATERIALS: The clinical experimental environment was provided by the 305 Hospital of Chinese PLA. The PSG made by Beijing Rising Sun Science-Tech Co., Ltd. was served as experimental instrument for comparison test and analytical software was designed by MATLAB.METHODS: Theoretical analysis was performed at the 305 Hospital of Chinese PLA in 2005 to create the anti-interference model and the wireless EEG sensors system model. In 2006, the circuit model helped us realize the small-sized wireless brain wave sensor that could suppress the interference effectively. The sensor was put into practical use at the 305 Hospital of Chinese PLA from February to August 2006. The experiment was approved by the hospital ethics committee. The volunteer testees were those who worked in the hospital and they had full knowledge of the objective, process and results of the experiment. Besides, those signals were compared with what the PSG recorded. MAIN OUTCOME MEASURES: Frequency spectrum of signals obtained in interference environment. RESULTS: For the brain signals that were captured by the wireless EGG sensors in the presence of interference, the power spectrum peak value was 6 926.043 within the alpha wave ranged at 8-12 Hz. For the AC interference, the power spectrum peak value was 0.356 at 50 Hz. Meanwhile, for the brain signals that were captured by the PSG, the power spectrum peak value was 1112.3 within the alpha wave ranged at 8-12 Hz; for the AC interference, the power spectrum peak value was 85 440 at 50 Hz.CONCLUSION: The system can obtain satisfying brain alpha wave signals and can suppress AC interference effectively.
