| Sensitivity of MEG and EEG to source orientation. | |
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MedLine Citation:
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PMID: 20640882 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An important difference between magnetoencephalography (MEG) and electroencephalography (EEG) is that MEG is insensitive to radially oriented sources. We quantified computationally the dependency of MEG and EEG on the source orientation using a forward model with realistic tissue boundaries. Similar to the simpler case of a spherical head model, in which MEG cannot see radial sources at all, for most cortical locations there was a source orientation to which MEG was insensitive. The median value for the ratio of the signal magnitude for the source orientation of the lowest and the highest sensitivity was 0.06 for MEG and 0.63 for EEG. The difference in the sensitivity to the source orientation is expected to contribute to systematic differences in the signal-to-noise ratio between MEG and EEG. |
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Authors:
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Seppo P Ahlfors; Jooman Han; John W Belliveau; Matti S Hämäläinen |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2010-07-18 |
Journal Detail:
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Title: Brain topography Volume: 23 ISSN: 1573-6792 ISO Abbreviation: Brain Topogr Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-04 Completed Date: 2010-11-22 Revised Date: 2011-06-16 |
Medline Journal Info:
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Nlm Unique ID: 8903034 Medline TA: Brain Topogr Country: United States |
Other Details:
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Languages: eng Pagination: 227-32 Citation Subset: IM |
Affiliation:
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MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital/Harvard Medical School, 149 13th Street, Rm 2301, Charlestown, MA 02129, USA. seppo@nmr.mgh.harvard.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Brain Mapping* Cerebral Cortex / physiology* Electroencephalography* Humans Magnetoencephalography* Male Models, Neurological Orientation* Sensitivity and Specificity Signal Processing, Computer-Assisted |
| Grant Support | |
ID/Acronym/Agency:
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HD040712/HD/NICHD NIH HHS; NS037462/NS/NINDS NIH HHS; NS057500/NS/NINDS NIH HHS; P41RR14075/RR/NCRR NIH HHS; R01 HD040712-08/HD/NICHD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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