Sensitivity of MEG and EEG to Source Orientation

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Sensitivity of MEG and EEG to Source Orientation

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dc.contributor.author Hämäläinen, Matti S.
dc.contributor.author Ahlfors, Seppo P.
dc.contributor.author Han, Jooman
dc.contributor.author Belliveau, John William
dc.date.accessioned 2011-04-29T02:18:55Z
dc.date.issued 2010
dc.identifier.citation Ahlfors, Seppo P., Jooman Han, John W. Belliveau, and Matti S. Hämäläinen. 2010. Sensitivity of MEG and EEG to Source Orientation. Brain Topography 23(3): 227-232. en_US
dc.identifier.issn 0896-0267 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:4879202
dc.description.abstract 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. en_US
dc.language.iso en_US en_US
dc.publisher Springer US en_US
dc.relation.isversionof doi:10.1007/s10548-010-0154-x en_US
dc.relation.hasversion http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2914866/pdf/ en_US
dash.license LAA
dc.subject magnetoencephalography en_US
dc.subject electroencephalography en_US
dc.subject suppression ratio en_US
dc.subject current dipole en_US
dc.subject radial source current en_US
dc.title Sensitivity of MEG and EEG to Source Orientation en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Brain Topography en_US
dash.depositing.author Ahlfors, Seppo P.
dc.date.available 2011-04-29T02:18:55Z
dash.affiliation.other HMS^Radiology-Massachusetts General Hospital en_US
dash.affiliation.other HMS^Health Sciences and Technology en_US

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