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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