Document Detail


Internal ventilation system of MR scanners induces specific EEG artifact during simultaneous EEG-fMRI.
MedLine Citation:
PMID:  23435207     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
During simultaneous EEG-fMRI acquisition, the EEG signal suffers from tremendous artifacts caused by the scanner "environment". Particularly, gradient artifacts and the ballistocardiogram have been well characterized, along with methods to eliminate them. Here, we describe another systematic artifact in the EEG signal, which is induced by the internal ventilation system of Siemens TRIO and VERIO MR scanners. A ventilation-level dependent vibration induces specific peaks in the frequency spectrum of the EEG. These frequency peaks are in the range of physiologically relevant brain rhythms (gamma frequency range), and thus interfere with their reliable acquisition. This ventilation dependent artifact was most prominent on the electrodes placed directly on the subject's head, so it is not sufficient to simply place the EEG's amplifier outside the scanner tube. Instead, the ventilator must be switched off to fully eliminate the ventilator's artificial manipulation of EEG recordings. Without the internal ventilator system being on, the temperature within the scanner tube may rise, thus requiring shorter scanning sessions or an additional external ventilation system.
Authors:
Till Nierhaus; Christopher Gundlach; Dominique Goltz; Sabrina Thiel; Burkhard Pleger; Arno Villringer
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-19
Journal Detail:
Title:  NeuroImage     Volume:  -     ISSN:  1095-9572     ISO Abbreviation:  Neuroimage     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9215515     Medline TA:  Neuroimage     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Affiliation:
Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany; Leipzig Research Center for Civilization Diseases, University of Leipzig, Germany; Berlin School of Mind&Brain and The Mind-Brain Institute, Humboldt-University Berlin, Germany; Berlin Neuroimaging Center and Department of Neurology, Charité Universitätsmedizin Berlin, Germany. Electronic address: till.nierhaus@charite.de.
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