Simultaneous EEG-fMRI benefits from the two modalities’ high-temporal and high-spatial resolutions. However, the MRI environment can cause artefacts in EEG signal, as movement of the EEG equipment causes artefactual voltages. This work investigated configurations of the EEG equipment (in-bore ‘sled’ v ‘cantilever’) in terms of their artefact reduction; in particular relating to vibrations from the scanner’s helium cooling pump.
We found vibration artefacts were broadly similar between the two configurations but the sled significantly reduced raw gradient artefact while increasing helium pump artefact. The helium pump needs to be turned off for highest recording quality in either configuration.