Electro-Magneto-Encephalography for the three-Shell Model: Numerical Implementation for Distributed Current in Spherical Geometry
نویسندگان
چکیده
The basic inverse problems for the functional imaging techniques of Electroencephalography (EEG) and Magnetoencephalography (MEG) consist of estimating the neuronal current in the brain from the measurement of the electric potential on the scalp and of the magnetic field outside the head. Here we present a rigorous derivation of the relevant formulae for a three-shell spherical model in the case of independent as well as simultaneous MEG and EEG measurements. Furthermore, we introduce an explicit and stable technique for the numerical implementation of these formulae. Numerical examples are presented using the locations and the normal unit vectors of the real 102 sensors of the Electa Neuromag (R) apparatus.
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Electro-magneto-encephalography for a three-shell model: distributed current in arbitrary, spherical and ellipsoidal geometries.
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