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Abstract #0703

Ultra-short echo time sequence for electrode locations in simultaneous EEG-FMRI

Russell Butler1, Guillaume Gilbert2, and Kevin Whittingstall3

1University of Sherbrooke, Sherbrooke, QC, Canada, 2MR Clinical Science - Philips Healthcare, Markham, ON, Canada, 3Diagnostic Radiology, University of Sherbrooke, Sherbrooke, QC, Canada

Precise and accurate knowledge of EEG sensors relative to underlying cortical tissue enhances simultaneous EEG-FMRI studies, but to date no specialized sequence for providing these locations exists. We propose an ultra-short echo time sequence (UTE) to highlight the plastic casing and wiring of a 64 channel MR compatible EEG cap. We show that the UTE resolves electrode components up to 6mm from the surface of the scalp, allowing to locate the precise contact point of electrode with skin and direction of wire leading away from the electrode in all subjects (n=8).

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