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Abstract #3084

Simultaneous EEG-fMRI: evaluating the effect of the EEG cap cabling configuration on the gradient artefact.

Muhammad E H Chowdhury 1 , Karen J Mullinger 1,2 , and Richard Bowtell 1

1 SPMIC, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom, 2 BUIC, 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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