Please use this identifier to cite or link to this item: http://ahro.austin.org.au/austinjspui/handle/1/10400
Title: Measurement and reduction of motion and ballistocardiogram artefacts from simultaneous EEG and fMRI recordings.
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
Citation: 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.
Internal ID Number: 17582785
URI: http://ahro.austin.org.au/austinjspui/handle/1/10400
DOI: 10.1016/j.neuroimage.2007.02.060
URL: http://www.ncbi.nlm.nih.gov/pubmed/17582785
Type: Journal Article
Subjects: Action Potentials.physiology
Adult
Artifacts
Ballistocardiography
Cerebral Cortex.physiopathology
Computer Simulation
Electroencephalography.methods
Epilepsy.diagnosis.physiopathology
Female
Fourier Analysis
Humans
Image Processing, Computer-Assisted.methods
Least-Squares Analysis
Magnetic Resonance Imaging.methods
Male
Middle Aged
Reference Values
Reproducibility of Results
Signal Processing, Computer-Assisted
Software
Appears in Collections:Journal articles

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