General bounds for electrode mislocation on the EEG inverse problem
General bounds for electrode mislocation on the EEG inverse problem
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DOI：
10.1016/j.cmpb.2010.05.008
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发表时间：
2011-07-01
影响因子：
6.1
通讯作者：
Muravchik, C. H.
中科院分区：
文献类型：
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作者：
Beltrachini, L.;von Ellenrieder, N.;Muravchik, C. H.
我们使用单个偶极源参数的 Cramer-Rao 界 (CRB) 分析电极错位对脑电图 (EEG) 反问题的影响。我们采用真实的头部形状模型，并使用边界元法求解正演问题； CRB 的使用使我们能够获得不依赖于求解逆问题所使用的算法的一般结果。我们考虑了电极错位的两个可能原因：电极位置测量误差以及电极和头皮表面之间的不完美配准。对于按照10-20标准放置在头皮中的120个电极，以及标准偏差为5毫米的电极位置误差，在最坏的情况下，源深度估计的标准偏差下限约为1毫米。因此，我们得出结论，电极位置的错误是可以容忍的，因为从实际角度来看，它们对脑电图逆问题的影响可以忽略不计。 (C) 2010 Elsevier Ireland Ltd. 保留所有权利。
We analyze the effect of electrode mislocation on the electroencephalography (EEG) inverse problem using the Cramer-Rao bound (CRB) for single dipolar source parameters. We adopt a realistic head shape model, and solve the forward problem using the Boundary Element Method; the use of the CRB allows us to obtain general results which do not depend on the algorithm used for solving the inverse problem. We consider two possible causes for the electrode mislocation, errors in the measurement of the electrode positions and an imperfect registration between the electrodes and the scalp surfaces. For 120 electrodes placed in the scalp according to the 10-20 standard, and errors on the electrode location with a standard deviation of 5 mm, the lower bound on the standard deviation in the source depth estimation is approximately 1 mm in the worst case. Therefore, we conclude that errors in the electrode location may be tolerated since their effect on the EEG inverse problem are negligible from a practical point of view. (C) 2010 Elsevier Ireland Ltd. All rights reserved.