| Model for the correction of motion-induced phase errors in multishot diffusion-weighted-MRI of the head: Are cardiac-motion-induced phase errors reproducible from beat-to-beat? | |
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MedLine Citation:
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PMID: 22213138 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In diffusion-weighted imaging, multishot acquisitions are problematic due to intershot inconsistencies of the phase caused by motion during the diffusion-encoding gradients. A model for the motion-induced phase errors in diffusion-weighted-MRI of the brain is presented, in which rigid-body and nonrigid-body motion are separated. In the model, it is assumed that nonrigid-body motion is due to cardiac pulsation, and that the motion patterns are repeatable from beat-to-beat. To test the validity of this assumption, the repeatability of nonrigid-body motion-induced phase errors is quantified in three healthy volunteers. Nonrigid-body motion-induced phase was found to significantly correlate (P < 0.05) with pulse-oximeter waveforms in ∼83% of the pixels tested across all slices and subjects. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc. |
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Authors:
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R L O'Halloran; S Holdsworth; M Aksoy; R Bammer |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-28 |
Journal Detail:
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Title: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine Volume: - ISSN: 1522-2594 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2012-1-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8505245 Medline TA: Magn Reson Med Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Wiley Periodicals, Inc. |
Affiliation:
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Department of Radiology, Stanford University, Stanford, California, USA. rafaelo@stanford.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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