by Satu Tissari, Jussi Rahola
in MEG and EEG using the boundary element method, CERFACS Technical Report TR/PA/98/39, CERFACS
http://www.cerfacs.fr/algor/reports/TR_PA_98_39.ps.gz
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Abstract:
Sources of brain activity, e.g., epileptic foci can be localized by measuring the magnetic field outside the head (MEG) or by recording the electric potential on the scalp (EEG). For a successful surgery a very high localization accuracy is needed. The most often used conductor model in the source localization is an analytic sphere, which is not always adequate, and thus a realistically shaped conductor model is needed. In this paper we propose a new Galerkin method with linear basis functions to solve the forward problem in MEG and EEG using the boundary element method (BEM). Its accuracy is compared to the collocation method with constant and linear basis functions. The accuracies are determined for a unit sphere for which analytic solutions are available. The Galerkin method gives a clear improvement in the accuracy of the forward problem. For fine triangular meshes, the Galerkin method reaches a given accuracy with lower computational costs than the collocation methods.
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