Removing the gradient artefact caused by 3D EPI in simultaneous EEG-fMRI experiments using a gradient model fit.
Muhammad E H Chowdhury 1 , Karen J Mullinger 1,2 , Glyn S Spencer 1 , and Richard Bowtell 1
SPMIC, School of Physics and Astronomy,
University of Nottingham, Nottingham, United Kingdom,
School of Psychology, University of Birmingham,
Birmingham, United Kingdom
EEG data recorded during fMRI are compromised by large
gradient artefact (GA) voltages. The GA is usually
corrected using average artefact correction; requiring
the amplifier to have a large enough dynamic range to
characterise the artefact voltages. Here we re-designed
the EEG cap-cable configuration so that the GA induced
in the 1 m ribbon cable by an AP gradient partially
cancels that induced in the EEG cap and head. We
demonstrate that the range and amplitude of the GA can
be significantly reduced by cap-cable re-wiring,
allowing recording at higher EEG bandwidths or increased
achievable image resolution without saturation.
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