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Simultaneous EEG and fMRIRecording, Analysis, and Application$
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Markus Ullsperger and Stefan Debener

Print publication date: 2010

Print ISBN-13: 9780195372731

Published to Oxford Scholarship Online: May 2010

DOI: 10.1093/acprof:oso/9780195372731.001.0001

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Influence of EEG Equipment on MR Image Quality

Influence of EEG Equipment on MR Image Quality

(p.107) 2.4 Influence of EEG Equipment on MR Image Quality
Simultaneous EEG and fMRI

Karen Mullinger

Richard Bowtell

Oxford University Press

This chapter first considers the detrimental effect of main magnetic field inhomogeneity in MRI, focusing on the particular effects of the differences in magnetic susceptibility between the materials used in EEG recording (electrodes and leads) and the human head. It then examines the importance of a uniform RF field in MRI, and analyzes how the presence of an EEG cap may affect the homogeneity of this field, thus reducing image quality. The ways in which these phenomena affect the signal-to-noise ratio (SNR), and cause local signal loss in EPI data collected for fMRI experiments, are discussed. The safety aspect of simultaneous EEG-fMRI, which is an extremely important consideration, is explored. Guidance is given relating to how to test the safety of an experimental set-up, and the importance of testing each new EEG recording arrangement in the scanner is emphasized. Finally, the chapter suggests some methods that may be used to overcome the problems of reduced MR image quality, which can be encountered when performing simultaneous EEG and fMRI.

Keywords:   electroencephalography, functional magnetic resonance, mrI, magnetic susceptibility, image quality

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