Ballistocardiogram artifacts in simultaneous EEG- fMRI acquisitions
Katrien Vanderperren, Jennifer R. Ramautar, Nikolay Novitskiy, Maarten De Vos, Maarten Mennes, Bart Vanrumste, Peter L. J. Stiers, Bea R.H. Van den Bergh, Johan P. Wagemans, Lieven Lagae, Stefan G. Sunaert, Sabine Van Huffel · Research portal (Tilburg University) · 2007
The simultaneous acquisition of electroencephalograpy (EEG) and functional magnetic resonance imaging (fMRI) data is very promising for the study of cognitive processes and disorders but causes severe artifacts in the EEG.In this study the aim is to remove the ballistocardiogram artifact, caused by cardiac pulse-related movements of the electrodes in the magnetic field.For this purpose a method based on blind source separation with Second Order Blind Identification (SOBI) was used and compared with Optimal Basis Set (OBS), a method based on channel-wise template subtraction.To validate the accuracy of the removal, an experiment that evokes visually evoked potentials was performed, inside and outside the scanner.Both methods were valuable but the same quality as in measurements without magnetic field could not be achieved.