不同脑模型下EEG、MEG正问题数值模拟

Numerical simulation of EEG,MEG forward problem in different head models

EEG、MEG是研究脑神经生理活动的影像技术.应用加权残值边界元法,针对球脑模型和卵球脑模型,计算了脑皮电位势和脑外磁场,对不同脑模型、偶极子参数下电位势图像进行了比较,给出了电位势和磁场在偶极子位置变化时的相对差.结果表明:偶极子位置对电位势峰值有明显影响,脑模型的选取对脑外磁场强度求解有影响.

EEG （electroencephalography）, MEG （magnetoenphalography） are two important imaging technologies to study the physiological activities of brain. In this paper, we develop algorithms based on BEM of Weighted Residuals for computing the scalp potentials and magnetic fields outer head in two head models, the ovoid head model and the sphere head model. The comparison of the maps of scalp potentials and relative difference measure（RDM） of scalp potentials and magnetic fields versus different dipole parameters between the ovoid head model and the spherical head model is made. The results show that the dipole location has great effects on the peak value of potential,the head shape has great effects on the RDM of magnetic field.