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Abstract #3112

An optimized setup for simultaneous EEG-fMRI at ultra-high field in a head-only 7T scanner

Joao Jorge 1,2 , Frederic Grouiller 3 , Robert Stoermer 4 , Christoph Michel 5 , Patricia Figueiredo 2 , Wietske van der Zwaag 1 , and Rolf Gruetter 1

1 Center for Biomedical Imaging, University of Lausanne/Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland, 2 Institute for Systems and Robotics, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Lisbon, Portugal, 3 Department of Radiology and Medical Informatics, Geneva University Hospital, University of Geneva, Geneva, Switzerland, 4 Brain Products, GmbH, Gilching, Germany, 5 Geneva University Hospital, Geneva, Switzerland

Simultaneous EEG-fMRI acquisitions are prone to specific artifacts that can seriously compromise data quality. In particular, mechanically-propagated scanner vibrations can significantly affect EEG recordings performed at ultra-high fields. In this work, we explored the advantages of a head-only MRI scanner for simultaneous EEG-fMRI acquisition, at 7 Tesla, using an optimized EEG setup with short cable lengths (~12cm from cap to amplifiers). The effects of cable length and type on EEG noise sensitivity were assessed. Following tests on safety and MR image quality, simultaneous acquisitions were performed on human subjects under visual stimulation, yielding reliable VEPs and occipital BOLD responses.

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