有限元法计算各向异性介质球头模型电位分布  

Computation of Potential Distribution in Anisotropic Dielectric Media Sphere Model by Finite Element Method

作　　者：李龙武[1,2] 彭仕政[1,2] 段晓勇[1,2] 刘晓春[1,2] 刘旭阳[1,2] 

机构地区：[1]贵州光电子技术及应用实验室贵州大学 [2]贵州大学理学院物理系贵阳550025

出　　处：《现代生物医学进展》2008年第1期180-183,共4页Progress in Modern Biomedicine

基　　金：贵州省科学技术基金研究项目(No.20052005)

摘　　要：在脑电正问题研究中,脑神经元所产生的电活动可用电流偶极子来模拟。本文提出把大脑看作各向异性介质球,即同时考虑电容效应、电导效应对脑内电流偶板子产生的电位的影响,并用有限元法推导出偶极子在各向异性介质球模型中的电位分布计算公式。结果表明介质的电容效应对电位分布是有影响的,反映了大脑活组织电特性,对外来不同频率的信号刺激有不同的响应。同时有限元法对大脑内某一区域内电位分布求解表明,测量较深层组织的电特性变化敏感的特点,可获得更多的测量信息。In the study of EEG forward problem, the current dipole can be adopted to simulate the nerve sources in human brains. Human brain is regarded as anisotropy dielectric media, the electric potential produced by dipole is influenced by permittivity and conductivity of human brain. The potential distribution produced by dipoles in human brain was simulated by the finite element method, deducing the calculation formula in potential distribution of current dipoles in anisotropic dielectric media sphere model. The result shows that the capacitance effect of the dielectric influences on the potential distribution,which reflects the electric properties of living brain different responses to the signal stimulation with different frequencies from outside, and more information can be obtained by measuring the electric properties in the deeper brain tissue.

关 键 词：脑电正问题 有限元法 各向异性介质球模型 

分 类 号：Q61[生物学—生物物理学]