Comparison of EEG Forward Solutions in Two Head Models

Head model and an efficient method for computing the forward EEG (electroencephalography)problem are essential to dipole source localization(DSL). In this paper, weinvestigate the numerical solutions of the scalp potentials in two head models, an ovoid head model and spherical model by using Weighted Residuals BEM based on two kinds of basis functions. The comparison of the maps of scalppotentials versus different dipole parameters in two models is made. The relative differences of potential, computing time and reliability are also presented. The results show that the patterns of potentials in different head shapes are similar but there is difference in magnitude of potential. The dipole position has great effect on the shift of peak potential. The method based on orthogonal basis is superior to that based on constant basis in computing time and accuracy.