Document Detail

Effects of cavities on EEG dipole localization and their relations with surface electrode positions.
MedLine Citation:
PMID:  2606568     Owner:  NLM     Status:  MEDLINE    
Effects of cavities in the human head on EEG dipole localization have been investigated by computer simulation. The human head is represented by a homogeneous spherical conductor including an eccentric spherical cavity which approximates effects of actual cavities inside the head. The homogeneous sphere model is used for assessing the effects caused by neglecting the cavity in the volume conductor model in the inverse dipole fitting procedure. Four electrode configurations have been examined to investigate their relation to the EEG inverse dipole solution. After examination of 2520 dipoles in the brain, the effects of cavities in the human head are found to be negligible when the dipole is located in the cortex or in the subcortex. When the dipole is located in the brain stem, the EEG inverse dipole solution is strongly affected by the cavity and is sensitive to the electrode configuration on the scalp. The EEG inverse dipole solution in the deep brain is sensitive to inhomogeneity in the lower part of the head when a single positive or negative potential pole is observed by the electrodes on the scalp, and at the same time is sensitive to the extent of the scalp covered by the electrodes. In conclusion, the electrodes should cover as much of the upper scalp as possible for deep source localization.
B He; T Musha
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of bio-medical computing     Volume:  24     ISSN:  0020-7101     ISO Abbreviation:  Int. J. Biomed. Comput.     Publication Date:  1989 Dec 
Date Detail:
Created Date:  1990-02-21     Completed Date:  1990-02-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0252005     Medline TA:  Int J Biomed Comput     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  269-82     Citation Subset:  IM    
Department of Applied Electronics, Tokyo Institute of Technology, Yokohama, Japan.
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MeSH Terms
Electromagnetic Phenomena
Head / anatomy & histology*
Models, Anatomic
Models, Biological*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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