Document Detail

Electro-magneto-encephalography for a three-shell model: distributed current in arbitrary, spherical and ellipsoidal geometries.
MedLine Citation:
PMID:  18757270     Owner:  NLM     Status:  MEDLINE    
The problem of determining a continuously distributed neuronal current inside the brain under the assumption of a three-shell model is analysed. It is shown that for an arbitrary geometry, electroencephalography (EEG) provides information about one of the three functions specifying the three components of the current, whereas magnetoencephalography (MEG) provides information about a combination of this function and of one of the remaining two functions. Hence, the simultaneous use of EEG and MEG yields information about two of the three functions needed for the reconstruction of the current. In particular, for spherical and ellipsoidal geometries, it is possible to determine the angular parts of these two functions as well as to obtain an explicit constraint satisfied by their radial parts. The complete determination of the radial parts, as well as the determination of the third function, requires some additional a priori assumption about the current. One such assumption involving harmonicity is briefly discussed.
A S Fokas
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-29
Journal Detail:
Title:  Journal of the Royal Society, Interface / the Royal Society     Volume:  6     ISSN:  1742-5689     ISO Abbreviation:  J R Soc Interface     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-03-27     Completed Date:  2009-06-12     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  101217269     Medline TA:  J R Soc Interface     Country:  England    
Other Details:
Languages:  eng     Pagination:  479-88     Citation Subset:  IM    
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UK.
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MeSH Terms
Electroencephalography / methods*
Magnetoencephalography / methods*
Models, Theoretical*
Synaptic Transmission

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