Document Detail


Improved MR phase-contrast velocimetry using a novel nine-point balanced motion-encoding scheme with increased robustness to eddy current effects.
MedLine Citation:
PMID:  22392844     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Phase-contrast MRI (PC-MRI) velocimetry is a noninvasive, high-resolution motion assessment tool. However, high motion sensitivity requires strong motion-encoding magnetic gradients, making phase-contrast-MRI prone to baseline shift artifacts due to the generation of eddy currents. In this study, we propose a novel nine-point balanced velocity-encoding strategy, designed to be more accurate in the presence of strong and rapidly changing gradients. The proposed method was validated using a rotating phantom, and its robustness and precision were explored and compared with established approaches through computer simulations and in vivo experiments. Computer simulations yielded a 39-57% improvement in velocity-noise ratio (corresponding to a 27-33% reduction in measurement error), depending on which method was used for comparison. Moreover, in vivo experiments confirmed this by demonstrating a 26-53% reduction in accumulated velocity error over the R-R interval. The nine-point balanced phase-contrast-MRI-encoding strategy is likely useful for settings where high spatial and temporal resolution and/or high motion sensitivity is required, such as in high-resolution rodent myocardial tissue phase mapping.
Authors:
Emil K S Espe; Jan Magnus Aronsen; Biljana Skrbic; Vidar Magne Skulberg; Jürgen E Schneider; Ole M Sejersted; Lili Zhang; Ivar Sjaastad
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-03-05
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  69     ISSN:  1522-2594     ISO Abbreviation:  Magn Reson Med     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-20     Completed Date:  2013-06-07     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  48-61     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
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MeSH Terms
Descriptor/Qualifier:
Animals
Artifacts
Computer Simulation
Magnetic Fields
Magnetic Resonance Imaging / methods*
Mice
Phantoms, Imaging
Rheology
Grant Support
ID/Acronym/Agency:
FS/11/50/29038//British Heart Foundation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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