Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-3-16
pubmed:abstractText
Although magnetoencephalography (MEG) and electroencephalography (EEG) have been available for decades, their relative merits are still debated. We examined regional differences in signal-to-noise-ratios (SNRs) of cortical sources in MEG and EEG. Data from four subjects were used to simulate focal and extended sources located on the cortical surface reconstructed from high-resolution magnetic resonance images. The SNR maps for MEG and EEG were found to be complementary. The SNR of deep sources was larger in EEG than in MEG, whereas the opposite was typically the case for superficial sources. Overall, the SNR maps were more uniform for EEG than for MEG. When using a noise model based on uniformly distributed random sources on the cortex, the SNR in MEG was found to be underestimated, compared with the maps obtained with noise estimated from actual recorded MEG and EEG data. With extended sources, the total area of cortex in which the SNR was higher in EEG than in MEG was larger than with focal sources. Clinically, SNR maps in a patient explained differential sensitivity of MEG and EEG in detecting epileptic activity. Our results emphasize the benefits of recording MEG and EEG simultaneously.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10210611, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10337565, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10616124, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10619420, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10831109, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-10984206, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-11293693, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-11459679, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-11484687, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-11870926, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12135228, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12169249, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12181013, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12226563, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12238617, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12495765, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12876149, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12880837, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-12881663, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-14499760, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-14530735, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15050554, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-1505993, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15066521, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15066524, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15083526, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15219578, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15652296, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15660769, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-15805816, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-16012659, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-16516443, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-1793687, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-2065748, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-2285267, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-2460320, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-2917762, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-3975600, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-5009769, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-6190632, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-7555909, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-8288276, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-9185681, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-95707, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-9751281, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-9751287, http://linkedlifedata.com/resource/pubmed/commentcorrection/18465745-9931269
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1097-0193
pubmed:author
pubmed:copyrightInfo
2008 Wiley-Liss, Inc.
pubmed:issnType
Electronic
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1077-86
pubmed:dateRevised
2011-1-31
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Mapping the signal-to-noise-ratios of cortical sources in magnetoencephalography and electroencephalography.
pubmed:affiliation
Athinoula A. Martinos Center For Biomedical Imaging, Massachusetts General Hospital, Charlestown, USA. daniel@nmr.mgh.harvard.edu
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