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Updated: Jun 23, 2025
Functional Mapping with Simultaneous MEG and EEG
Published on: June 14, 2010
Fast and Accurate EEG/MEG BEM-Based Forward Problem Solution for High-Resolution Head Models
William A Wartman1, Guillermo Nuñez Ponasso1, Zhen Qi1
1Dept. of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
Abstract:
A BEM (boundary element method) based approach is developed to accurately solve an EEG/MEG forward problem for a modern high-resolution head model in approximately 60 seconds using a common workstation. The method utilizes a charge-based BEM with fast multipole acceleration (BEM-FMM) and a "smart" mesh pre-refinement (called b-refinement) close to the singular source(s). No costly matrix-filling or direct solution steps typical for the standard BEM are required; the method generates on-skin voltages as well as MEG magnetic fields for high-resolution head models in approximately 60 seconds after initial model assembly. The method is verified both theoretically and experimentally.
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