Abstract
Accurate knowledge of the location of the cortical surface is important in solving forward and inverse problems in EEG and MEG. Since the sources of event related surface potentials and magnetic fields are generally assumed to be confined to the cortex, knowledge of the shape of the cortex can be used to constrain the location of sources when solving the inverse problem [3]. Accurate knowledge of the cortical surface can also be used in solving the forward problem. By assuming that the head consists of a set of homogeneous regions of constant conductivity (e.g. brain, skull, scalp) the forward problem relating the measured EEG or MEG signal and the primary current sources can be solved using a boundary element method (BEM). The brain region for the BEM can be found using the method described here.
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Sandor, S.R., Leahy, R.M., Timsari, B. (2000). Generating Cortical Constraints for MEG Inverse Procedures Using MR Volume Data. In: Aine, C.J., Stroink, G., Wood, C.C., Okada, Y., Swithenby, S.J. (eds) Biomag 96. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1260-7_285
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DOI: https://doi.org/10.1007/978-1-4612-1260-7_285
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