Bashar M R, Li Y, Wen P
Department of Mathematics and Computing, Centre for Systems Biology, University of Southern Queensland, Toowoomba, QLD, 4350, Australia.
Australas Phys Eng Sci Med. 2010 Sep;33(3):233-42. doi: 10.1007/s13246-010-0027-3. Epub 2010 Aug 31.
In this study, we consider different conductivity values based on tissue location in a human head model. We implement local conductivity (LC) to compute head surface potentials in three-, four-layered spherical and realistic head models using finite element method (FEM). Implementing LC for all head models, we obtain significant scalp potential variations in the term of relative difference measurement (RDM) and magnification (MAG) values with a maximum of 2.03±1.81 and 8.27±6.36, respectively. We also investigate the effects of conductivity variations (CVs) of head tissue layer on scalp potentials and find a maximum of 2.15±1.93 RDM and 8.57±6.61 MAG values. Our study concludes that it is important to assign LC to each tissue and it is also important to assign appropriate conductivity value in the construction of a head model for achieving accurate scalp potentials.
在本研究中，我们基于人体头部模型中的组织位置考虑不同的电导率值。我们采用局部电导率（LC），使用有限元方法（FEM）在三层、四层球形和真实头部模型中计算头部表面电位。对所有头部模型实施LC后，我们通过相对差异测量（RDM）和放大率（MAG）值获得了显著的头皮电位变化，最大值分别为2.03±1.81和8.27±6.36。我们还研究了头部组织层电导率变化（CVs）对头皮电位的影响，发现RDM最大值为2.15±1.93，MAG最大值为8.57±6.61。我们的研究得出结论，在构建头部模型时为每个组织分配LC以及分配适当的电导率值对于获得准确的头皮电位非常重要。
