Cited by 334EEG and Brain-Computer InterfacesNumerical methods in inverse problemsGeophysical and Geoelectrical Methods

Electric Dipole Tracing in the Brain by Means of the Boundary Element Method and Its Accuracy

He, Bin, Musha, Toshimitsu, Okamoto, Yoshiwo, Homma, Saburo, Nakajima, Yoshio, Sato, Toshio·1987·IEEE Transactions on Biomedical Engineering

Abstract

A method of localizing an electrical dipole in the brain from the scalp potential distribution has been developed with the aid of the boundary element method, in which a real geometry of the head is exactly taken into account and homogeneous electrical conductivity is assumed. Accuracy of the method was evaluated through animal experiments with a cat in which a current dipole was artificially generated in the brain. Deviation of the estimated dipole location from the true one was not random, but rather systematic (probably due to in-homogeneous conductivity distribution). It is numerically found that cavities in the skull disturb the inverse solution especially when the dipole is oriented toward the cavities. In vivo tests of the method were also done for primary somatosensory evoked potentials as a response to median nerve stimulation of a cat and myoclonic EEG. Although the homogeneous approximation was made, it does not change the significance of the results obtained by the present method.

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Crossref · 10.1109/tbme.1987.326056

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  • An important development in electrophysiological source imaging is to perform constrained source imaging by using anatomical information.

    “An important development in ESI is to perform “constrained” source imaging by using anatomical information (13).”
  • Since the late 1980s, the boundary element method has been most widely used for anatomically constrained electrophysiological source imaging with EEG/MEG.

    “Since the introduction to brain source imaging in late 1980s (13, 14), the BEM has been most widely used for anatomically constrained ESI with EEG/MEG.”
  • For realistic-geometry head models, numeric solutions are attainable with the boundary element method assuming isotropic conductivity or the finite element method assuming anisotropic conductivity.

    “For realistic-geometry head models, numeric solutions are attainable with either the boundary element method (BEM) by assuming isotropic conductivity (13, 14) or the finite element method (FEM) models by assuming anisotropic conductivity (15).”

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Authors
He, B., Musha, T., Okamoto, Y., Homma, S., Nakajima, Y., & Sato, T.
Affiliations
  • Tokyo Institute of Technology (JP)
  • Chiba University (JP)
Venue
IEEE Transactions on Biomedical Engineering
Published
1987-06
Volume
BME-34
Issue
6
Pages
406-414
ISSN
0018-9294 (ISSN-L)
OpenAlex
W1986599493
Cited by
334
References
24
Citations by year
2026: 6 · 2025: 11 · 2024: 10 · 2023: 7 · 2022: 9 · 2021: 5 · 2020: 7 · 2019: 7 · 2018: 13 · 2017: 14 · 2016: 11 · 2015: 9 · 2014: 10 · 2013: 5 · 2012: 9
FWCI
3.18
Type
journal article
Language
en
Open access
closed
Locations
  • IEEE Transactions on Biomedical Engineering (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
  • Physical Sciences › Mathematics › Mathematical Physics › Numerical methods in inverse problems
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geophysical and Geoelectrical Methods
Keywords
brain electrical activity, boundary element method, inverse problems, head geometry, median nerve stimulation, cats
MeSH terms
Algorithms, Animals, Brain, Cats, Electrophysiology, Epilepsy, Evoked Potentials, Humans, Somatosensory Cortex

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