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Title: Measurement and reduction of motion and ballistocardiogram artefacts from simultaneous EEG and fMRI recordings.
Austin Authors: Masterton, Richard A J;Abbott, David F ;Fleming, Steven W;Jackson, Graeme D 
Affiliation: Brain Research Institute, Neurosciences Building, Austin Health, Banksia Street, Heidelberg Heights, Victoria 3081, Australia
Issue Date: 18-May-2007
Publication information: Neuroimage 2007; 37(1): 202-11
Abstract: Recording the electroencephalogram (EEG) during functional magnetic resonance imaging (fMRI) permits the identification of haemodynamic changes associated with EEG events. However, subject motion within the MR scanner can cause unpredictable and frustrating artefacts on the EEG that may appear focally, bilaterally or unilaterally and can sometimes be confused for epileptiform activity. Motion may arise from a number of sources: small involuntary cardiac-related body movements (ballistocardiogram); acoustic vibrations due to the scanner machinery; and voluntary subject movements. Here we describe a new real-time technique for removing ballistocardiogram (BCG) and movement artefact from EEG recordings in the MR scanner using a novel method for recording subject motion. We record the current induced in a number of wire loops, attached to a cap worn by the subject, due to motion in the static magnetic field of the scanner (Faraday's Law). This is the same process that leads to the motion artefacts on the EEG, and hence these signals are ideally suited to filtering these artefacts from the EEG. Our filter uses a linear adaptive technique based upon the Recursive Least Squares (RLS) algorithm. We demonstrate in both simulations and real EEG recordings from epilepsy patients that our filter significantly reduces the artefact power whilst preserving the underlying EEG signal.
Gov't Doc #: 17582785
DOI: 10.1016/j.neuroimage.2007.02.060
Type: Journal Article
Subjects: Action Potentials.physiology
Cerebral Cortex.physiopathology
Computer Simulation
Fourier Analysis
Image Processing, Computer-Assisted.methods
Least-Squares Analysis
Magnetic Resonance Imaging.methods
Middle Aged
Reference Values
Reproducibility of Results
Signal Processing, Computer-Assisted
Appears in Collections:Journal articles

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