Ryynänen Outi R M, Hyttinen Jari A K, Laarne Päivi H, Malmivuo Jaakko A
Ragnar Granit Institute, Tampere University of Technology, Tampere, Finland.
IEEE Trans Biomed Eng. 2004 Sep;51(9):1547-54. doi: 10.1109/TBME.2004.828036.
The purpose of the present study was to examine the spatial resolution of electroencephalography (EEG) by means of inverse cortical EEG solution. The main interest was to study how the number of measurement electrodes and the amount of measurement noise affects the spatial resolution. A three-layer spherical head model was used to obtain the source-field relationship of cortical potentials and scalp EEG field. Singular value decomposition was used to evaluate the spatial resolution with various measurement noise estimates. The results suggest that as the measurement noise increases the advantage of dense electrode systems is decreased. With low realistic measurement noise, a more accurate inverse cortical potential distribution can be obtained with an electrode system where the distance between two electrodes is as small as 16 mm, corresponding to as many as 256 measurement electrodes. In clinical measurement environments, it is always beneficial to have at least 64 measurement electrodes.
本研究的目的是通过皮层脑电图逆解来检验脑电图（EEG）的空间分辨率。主要关注点是研究测量电极的数量和测量噪声量如何影响空间分辨率。使用三层球形头部模型来获得皮层电位与头皮脑电图场的源场关系。奇异值分解用于评估不同测量噪声估计下的空间分辨率。结果表明，随着测量噪声增加，密集电极系统的优势会降低。在实际测量噪声较低的情况下，使用两个电极之间距离小至16毫米（相当于多达256个测量电极）的电极系统可以获得更准确的皮层电位逆分布。在临床测量环境中，至少有64个测量电极总是有益的。
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