摘要
目的:探讨不同插值计算方法对构建平均平方根值脑电地形图的影响。方法:检查于1993-01/1998-12在解放军总医院和中华疼痛医学会第二临床中心门诊完成。使用美国NeuroscanInc公司基于通用计算机系统的脑电采集系统,连续记录脑电信号,24名20～29岁正常受试者。受试者在安静清醒条件下记录,使用10/20%系统放置电极,单极记录(A1+A2)28通道脑电图。连续记录100～240s的脑电,取1s为一个时间段进行FFT变换,采样率256Hz,频率分辨率1Hz。用眼动伪迹矫正程序去除伪迹。使用脑电波幅频谱,根据线性插值计算方法,选择不同的邻近电极点(1,2,3,4)进行脑电地形图电位的插值计算。脑电地形图用平均平方根功率(波幅频谱)表示。结果:①不同的插值方法明显影响脑电地形图的电位分布。增加插值参考点,脑电地形图的精确性增加。②各个频带最大的功率主要位于中线部位的Fz,Cz,Pz,PO1,PO2,O2。最低功率位于双颞叶T3,T4。各个频段最高功率值为12.55±8.80(α2),8.94±5.17(α1),7.49±3.11(δ),7.47±2.02(θ),3.25±1.32(β1),1.51±0.38(β2)。③δ(2～4Hz),θ(5～7Hz),α1(8～9Hz),α2(10～13Hz),β1(14～20Hz),β2(21～32Hz)频带所有28通道平均平方根功率值均在20μV以下。结论:4点插值计算方法的脑电地形图最精确,使用不同的插值方法计算脑电地形图是必要的。中线电极是计算脑电地形图不可缺少的电极部位。
AIM： To investigate the effect of different interpolation methods in construction of brain electrical activity map （BEAM） on root-mean-square power.
METHODS： The examination was carried out in the General Hospital of Chinese PLA and the out-patient clinic of Second Clinical Center of Chinese Association for the Study of Pain from January 1993 to December 1998. Continuous electroencephalogram （EEG） were collected with a PC-based EEG acquisition system （Neurosoft Inc） from 28-channels using 10/20% system monopolar ontage （A1＋A2） in 24 healthy volunteers （20-29 years）. Subjects were instructed to remain relaxed, but awake, and to avoid eye or body movements during the recording periods. The continuous 100-240 s EEG data were segmented into 1 s epochs for FFT transform （sampled at 256 Hz, 1 Hz frequency resolution）. The epochs contaminated by eye movement-related artifacts were excluded from analysis using.a rejection criterion procedure. Recorded EEG using several different interpolation point （1 point, 2 point, 3 point, 4 point）determined the number of nearest neighboring electrodes to be used by the linear interpolation algorithm in BEAM.. BEAM was constructed from amplitude spectrum data （root-mean-square power）.
RESULTS： ① Election of the different interpolation point obviously influenced distribution of BEAM. Added interpolation point increased the accuracy of BEAM. ②The maximal power be mainly closed to midline electrodes （Fz,Cz,Pz,PO1,PO2,O2）. The minimum was located temporal （T3, T4）. The highest power of different bandpass was （12.55±8.80） （α2）, （8.94±5,17） （α 1）, （7.49±3.11） （δ）, （7.47±2.02） （θ）, （3.25 ±1.32） （β1）, （1.51-0.38） （β2）. ③28-channel of δ（2-4 Hz）,θ（5-7 Hz）,α1（8-9 Hz）, α2（10-13 Hz）,β1（14-20 Hz）,β2（21-32 Hz） in root-mean-square power was under 20 μV.
CONCLUSION： Four-point interpolation is exact algorithm method for BEAM, but the different methods is also necessary. The midline recording is very important in construction of BEAM.
出处
《中国临床康复》
CSCD
北大核心
2006年第33期104-106,i0005,共4页
Chinese Journal of Clinical Rehabilitation
