The helium Pump artifact in simultaneous EEG-fMRI does not affect ERP signal-to-noise or topological consistency.
Johan N van der Meer 1 , Andr Pampel 2 , Jennifer R Ramautar 3 , German Gomez-Herrero 3 , Jran Lepsien 2 , Harald Mller 2 , and Martin Walter 1
Clinical Affective Neuroimaging Laboratory,
Department of Behavioral Neurology, Leibniz Institute
for Neurobiology, Magdeburg, Germany,
Magnetic Resonance Unit, Max Planck institute for human
cognitive and brain sciences, Leipzig, Germany,
of Sleep and Cognition, Netherlands Institute for
Neuroscience, Amsterdam, Netherlands
During simultaneous EEG-fMRI measurements, investigators
routinely shuts down the helium pump to avoid the pump
artifact in the EEG; however, this potentially harms the
scanner. In this work, we investigate if this He pump
artifact is really detrimental for the EEG. We performed
EEG-fMRI with a reversal checkerboard task while the He
pump was off and on and compare EEG quality markers
between these two conditions. We also recorded EEG
outside the scanner. We found (1) the He pump did not
have discernable impact on EEG quality, (2) The quality
during scanning is much lower during scanning as
compared to outside.
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