Influence of conductivity tensors on the scalp electrical potential: Study with 2-D finite element models
Influence of conductivity tensors on the scalp electrical potential: Study with 2-D finite element models
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DOI：
10.1109/tns.2002.807937
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发表时间：
2003-02-01
影响因子：
1.8
通讯作者：
Singh, M
中科院分区：
文献类型：
--
作者：
Kim, S;Kim, TS;Singh, M
在2-D头部模型的人受试者的电导率张量的影响进行了评估的脑电图的前向解决方案。通过将平均迹线值线性映射到公布的电导率值，从磁共振扩散张量图像估计头部不同区域的电导率张量。根据头皮电位之间的差异，将各向异性电导率模型与各向同性电导率模型进行了比较。用相关系数（CC）和相对误差（RE）来衡量两种模型之间的差异。我们还提出了一个新的措施，缩放删除RE（SRRE）作为一个更有效的指标的差异。对354个偶极子源的计算结果表明，各向异性电导率张量与各向同性模型有显著差异（CC = 0.96，RE = 30.73%，SRRE = 19.34%）。虽然CC很高，但较大的RE和SRRE表明，这种差异也可能影响电流偶极子源定位的逆解的精度。
The influence of conductivity tensor on the forward solution of electroencephalography was assessed in 2-D head models of a human subject. The conductivity tensors of different regions of the head were estimated from magnetic resonance-diffusion tensor images by linearly mapping the mean trace values to the published conductivity values. The anisotropic conductivity model was compared with the isotropic conductivity model in terms of the difference between the scalp potentials. The differences were measured by the, cross correlation (CC) and the relative error (RE) between two models. We have also proposed a new measure, scaling-removed RE (SRRE) as a more effective indicator of the difference. The results with 354 individual dipole sources show that there are remarkabel differences between the anisotropic conductivity tensor and the isotropic model (CC = 0.96, RE = 30.73% and SRRE = 19.34%). Although the CC is high, the large RE and SRRE indicate that this difference may also affect the accuracy of inverse solutions in localizing the current dipole sources.