Effect Of EEG, MEG Brain Model Positive Problem And Dipole Parameters

EEG(Electroencephalography) and MEG（Magnetoencephalography）are twomedical imaging technology used to study brain activity. They become importanttechnical means of brain function research and clinical diagnostics, because of itshigh temporal resolution, trauma,etc. Numerical calculation is essential to analyseand visualize brain imaging data quantitatively.In this paper, we use the weightedresidual method to solve the numerical solution of integral equations based onquasi-steady-state Maxwell’s equations.The past work was mainly focused on the affect of the numerical methods andbrain model on numerical calculation speed. The result of how brain model anddipole parameters affect the brain skin electrical potential and the brain externalmagnetic field are limited. In this paper, we use the centrosphere, ellipsoid, threekinds of oosphere as analytical brain model to measure the brain skin electricalpotential and the brain external magnetic field generated by Internal brain nervecurrent source. We study the relationship between the brain skin electrical potential,the brain external magnetic field in different brain model and dipole differentposition; the relationship between the brain skin electrical potential, the brainexternal magnetic field generated by dipoles in different directions and dipoledifferent position; the relationship between the brain skin electrical potential, thebrain external magnetic field in different position and dipole different position.Numerical simulation in different brain model showed that: the peak of brainskin electrical potential has the same variation which is increasing when dipolemoves up along the Z axis. While the peak of brain skin electrical potential issignificantly different with each other; The original magnetic field is same; Themagnetic field generated by the volume current is significantly different with eachother. Numerical simulation of dipoles in different directions showed that: the peakof brain skin electrical potential has the same variation which is increasing whendipole moves up along the Z axis. While the peak of brain skin electrical potential issignificantly different with each other; The magnetic field generated by the volume current is significantly different with each other. Numerical simulation of differentobservation points showed that:the brain skin electrical potential and the volumecurrent are both affected by the observation point.