Realistic and spherical head modeling for EEG forward problem solution: a comparative cortex-based analysis.
Realistic and spherical head modeling for EEG forward problem solution: a comparative cortex-based analysis.
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DOI：
10.1155/2010/972060
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发表时间：
2010
影响因子：
--
通讯作者：
Di Salle F
中科院分区：
文献类型：
--
作者：
Vatta F;Meneghini F;Esposito F;Mininel S;Di Salle F
脑电（EEG）的前向模型的准确性部分取决于头部组织的几何形状，并强烈影响源重建过程的可靠性，但目前还不清楚哪些大脑区域对不同模型几何形状的选择更敏感。在本文中，我们比较不同的球形和现实的头部建模技术估计EEG的前向解决方案，从当前偶极子源分布在一个标准的皮质空间重建蒙特利尔神经研究所（MNI）的MRI数据。计算机模拟三个不同的四壳头模型，两个与现实的几何形状，无论是基于表面（BEM）或基于体积（FDM），和相应的传感器安装的球形模型。对26个对称偶极子源进行了点扩展函数（PSF）和导联场（LF）互相关分析，以定量评估模型在EEG源重建中的准确性。现实的几何形状被证明是一个相关的改善因素，特别是重要的，当考虑放置在颞叶或枕叶皮质的来源。
The accuracy of forward models for electroencephalography (EEG) partly depends on head tissues geometry and strongly affects the reliability of the source reconstruction process, but it is not yet clear which brain regions are more sensitive to the choice of different model geometry. In this paper we compare different spherical and realistic head modeling techniques in estimating EEG forward solutions from current dipole sources distributed on a standard cortical space reconstructed from Montreal Neurological Institute (MNI) MRI data. Computer simulations are presented for three different four-shell head models, two with realistic geometry, either surface-based (BEM) or volume-based (FDM), and the corresponding sensor-fitted spherical-shaped model. Point Spread Function (PSF) and Lead Field (LF) cross-correlation analyses were performed for 26 symmetric dipole sources to quantitatively assess models' accuracy in EEG source reconstruction. Realistic geometry turns out to be a relevant factor of improvement, particularly important when considering sources placed in the temporal or in the occipital cortex.