Internal ventilation system of MR scanners induces specific EEG artifact during 
simultaneous EEG-fMRI

Nierhaus, Till; Gundlach, Christopher; Goltz, Dominique; Thiel, Sabrina; Pleger, Burkhard; Villringer, Arno

doi:10.1016/j.neuroimage.2013.02.016

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Internal ventilation system of MR scanners induces specific EEG artifact during simultaneous EEG-fMRI

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Nierhaus, Till
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Leipzig Research Center for Civilization Diseases (LIFE), University of Leipzig, Germany;
Berlin School of Mind and Brain, Humboldt University Berlin, Germany;
Berlin Neuroimaging Center, Charité University Medicine Berlin, Germany;

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Gundlach, Christopher
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Goltz, Dominique
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Department of Experimental Psychology and Methods, University of Leipzig, Germany;

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Thiel, Sabrina
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Department of Mathematics, Humboldt University Berlin, Germany;
Berlin School of Mind and Brain, Humboldt University Berlin, Germany;

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Pleger, Burkhard
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Clinic for Cognitive Neurology, University of Leipzig, Germany;

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Villringer, Arno
Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Clinic for Cognitive Neurology, University of Leipzig, Germany;
Leipzig Research Center for Civilization Diseases (LIFE), University of Leipzig, Germany;
Berlin School of Mind and Brain, Humboldt University Berlin, Germany;
Berlin Neuroimaging Center, Charité University Medicine Berlin, Germany;

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Citation

Nierhaus, T., Gundlach, C., Goltz, D., Thiel, S., Pleger, B., & Villringer, A. (2013). Internal ventilation system of MR scanners induces specific EEG artifact during simultaneous EEG-fMRI. NeuroImage, 74, 70-76. doi:10.1016/j.neuroimage.2013.02.016.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-F524-6

Abstract

During simultaneous EEG-fMRI acquisition, the EEG signal suffers from tremendous artifacts caused by the scanner “environment”. Particularly, gradient artifacts and the ballistocardiogram have been well characterized, along with methods to eliminate them. Here, we describe another systematic artifact in the EEG signal, which is induced by the internal ventilation system of Siemens TRIO and VERIO MR scanners. A ventilation-level dependent vibration induces specific peaks in the frequency spectrum of the EEG. These frequency peaks are in the range of physiologically relevant brain rhythms (gamma frequency range), and thus interfere with their reliable acquisition. This ventilation dependent artifact was most prominent on the electrodes placed directly on the subject's head, so it is not sufficient to simply place the EEG's amplifier outside the scanner tube. Instead, the ventilator must be switched off to fully eliminate the ventilator's artificial manipulation of EEG recordings. Without the internal ventilator system being on, the temperature within the scanner tube may rise, thus requiring shorter scanning sessions or an additional external ventilation system.