On an indirect boundary element method for the anisotropic EEG forward problem

This paper introduces a boundary element method for the electroencephalography (EEG) forward problem that can handle homogeneous anisotropic conductivities of the cerebral medium. Since the harmonicity in R³ with respect to a given tensorial conductivity is not mantained when the tensorial conductivity changes, the standard strategies to obtain EEG integral equations cannot be used. In this work we adopted an indirect boundary element formulation where harmonicity conditions are imposed piecewise. Numerical results confirms the correcteness and accuracy of our approach and its matchning with existing, differential equation based, approaches.