Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI.

Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Research Abstract Details 

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Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Abstract Text:

Justin L Vincent,Linda J Larson-Prior,John M Zempel,Abraham Z Snyder,

OBJECTIVE: Simultaneous acquisition of electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) enables studies of brain activity at both high temporal and high spatial resolution. However, EEG acquired in a magnetic field is contaminated by ballistocardiogram (BKG) artifact. The most commonly used method of BKG artifact reduction, averaged artifact subtraction (AAS), was not designed to account for overlapping BKG waveforms generated by adjacent beats. We describe a new method based on a moving general linear model (mGLM) that accounts for overlapping BKG waveforms. METHODS: Simultaneous EEG-fMRI at 3 Tesla was performed in nine normal human subjects (8-11 runs/subject, 5.52 min/run). Gradient switching artifact was effectively reduced using commercially supplied procedures. Cardiac beats were detected using a novel correlation detector algorithm applied to the EKG trace. BKG artifact was reduced using both mGLM and AAS. RESULTS: mGLM recovered BKG waveforms outlasting the median inter-beat interval. mGLM more effectively than AAS removed variance in the EEG attributable to BKG artifact. CONCLUSIONS: mGLM offers advantages over AAS especially in the presence of variable heart rate. SIGNIFICANCE: The BKG artifact reduction procedure described herein improves the technique of simultaneous EEG-fMRI. Potential applications include basic investigations of the relationship between scalp potentials and functional imaging signals as well as clinical localization of epileptic foci.

Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Publishing Authors By Initials

JL Vincent,LJ Larson-Prior,JM Zempel,AZ Snyder,

For similar investigative techniques: epidemiologic methods: epidemiologic research design: reproducibility of results research abstracts see: investigative techniques: epidemiologic methods: epidemiologic research design: reproducibility of results research

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Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Clinical neurophysiology : official journal of the

VOLUME: 118

Page Numbers: 981-98

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ISSN: 1388-2457

DAY: 26

MONTH: 03

YEAR: 2007

Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Information

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LANGUAGE: eng

NlmUniqueID: 100883319

Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI. Keywords Mesh Terms:

KEYWORDS: Reproducibility of Results

MESH TERMS: statistics & numerical data

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Grant and Affiliation Information for Moving GLM ballistocardiogram artifact reduction for EEG acquired simultaneously with fMRI.

AFFILIATION: Department of Radiology, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA.

Country: Netherlands

AGENCY: United States NINDS

GRANT: NS06833

ACRONYM: NS

MEDLINETA: Clin Neurophysiol

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