INVERSE LOCALIZATION OF ELECTRIC-DIPOLE CURRENT SOURCES IN FINITE-ELEMENT MODELS OF THE HUMAN HEAD

The paper describes finite element related procedures for inverse loca lization of multiple sources in realistically shaped head models. Dipo le sources are modeled by placing proper monopole sources on neighbori ng nodes. Lead field operators are established for dipole sources. Two different strategies for the solution of inverse problems, namely com binatorial optimization techniques and regularization methods are disc ussed and applied to visually evoked potentials, for which exemplary r esults are shown. Most of the procedures described are fully automatic and require only proper input preparation. The overall work for the e xample presented (from EEG recording to Visual inspection of the resul ts) can be performed in roughly a week, most of which is waiting time for the computation of the lead field matrix or inverse calculations o n a standard and affordable engineering workstation. (C) 1997 Elsevier Science Ireland Ltd.