The influence of inhomogeneities in a head model on EEG and MEG

S.P. van den Broek, M. Donderwinkel, M.J. Peters

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    Abstract

    A realistically shaped model of the head, consisting of tetrahedral elements, is used to investigate the influence of inhomogeneities in the volume conductor (e.g., ventricles and holes) on EEG and MEG. The potential is computed using the finite-element method. The magnetic field is calculated from this potential distribution, applying the law of Biot-Savart.
    In order to study the influence of the ventricles, computations are carried out using two models: one in which the elements within the ventricles are given the same conductivity as the brain and one in which these elements have a higher conductivity. The influence of holes in the skull layer is examined by giving some elements in the skull layer the same conductivity as that of the brain.
    The geometry of compartments is obtained semiautomatically from Magnetic Resonance Imaging (MRI) scans. The surface of the ventricles is obtained by manually selecting points on the interface between ventricle and brain. The computation time depends on the total number of tetrahedrons. Therefore, the vertices are distributed in, such a way that a sufficiently high accuracy is obtained with as few tetrahedrons as possible.
    Original languageEnglish
    Pages (from-to)233-233
    JournalBrain topography
    Volume9
    Issue number3
    DOIs
    Publication statusPublished - 8 Mar 1997
    Event7th International ISBET Congress 1996
    - Rio de Janeiro, Brazil
    Duration: 14 Oct 199617 Oct 1996
    Conference number: 7

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