Abstract #3941
Towards high-quality simultaneous EEG-fMRI acquisitions at 7 Tesla: detection and reduction of EEG artifacts due to head motion in B0
Joo Jorge 1,2 , Frdric Grouiller 3 , Wietske van der Zwaag 4 , Rolf Gruetter 1 , and Patrcia Figueiredo 2
1
Laboratory for Functional and Metabolic
Imaging, cole Polytechnique Fdrale de Lausanne,
Lausanne, Switzerland,
2
Department
of Bioengineering, Instituto Superior Tcnico, Lisbon,
Portugal,
3
Biomedical
Imaging Research Center, University of Geneva, Geneva,
Switzerland,
4
Biomedical
Imaging Research Center, cole Polytechnique Fdrale de
Lausanne, Lausanne, Switzerland
During simultaneous EEG-fMRI, the artifacts induced on
EEG recordings by the strong magnetic fields employed
can largely overwhelm the signals of interest. Unlike
gradient and cardiac pulse-related artifacts,
contributions due to spontaneous head motion in B0 have
so far received little attention, but can become
considerably problematic at higher field strengths.
Here, an approach is presented for detection and
reduction of EEG artifacts due to head motion in B0.
This approach produced important reductions in EEG noise
power on EEG-fMRI recordings at 7T, and largely improved
sensitivity to visual responses at both a trial-average
and a single-trial level.
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