Document Detail

Prospective motion correction using tracking coils.
MedLine Citation:
PMID:  22565377     Owner:  NLM     Status:  MEDLINE    
Intracavity imaging coils provide higher signal-to-noise than surface coils and have the potential to provide higher spatial resolution in shorter acquisition times. However, images from these coils suffer from physiologically induced motion artifacts, as both the anatomy and the coils move during image acquisition. We developed prospective motion-correction techniques for intracavity imaging using an array of tracking coils. The system had <50 ms latency between tracking and imaging, so that the images from the intracavity coil were acquired in a frame of reference defined by the tracking array rather than by the system's gradient coils. Two-dimensional gradient-recalled and three-dimensional electrocardiogram-gated inversion-recovery-fast-gradient-echo sequences were tested with prospective motion correction using ex vivo hearts placed on a moving platform simulating both respiratory and cardiac motion. Human abdominal tests were subsequently conducted. The tracking array provided a positional accuracy of 0.7 ± 0.5 mm, 0.6 ± 0.4 mm, and 0.1 ± 0.1 mm along the X, Y, and Z directions at a rate of 20 frames-per-second. The ex vivo and human experiments showed significant image quality improvements for both in-plane and through-plane motion correction, which although not performed in intracavity imaging, demonstrates the feasibility of implementing such a motion-correction system in a future design of combined tracking and intracavity coil.
Lei Qin; Ehud J Schmidt; Zion Tsz Ho Tse; Juan Santos; William S Hoge; Clare Tempany-Afdhal; Kim Butts-Pauly; Charles L Dumoulin
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-05-07
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 Mar 
Date Detail:
Created Date:  2013-02-25     Completed Date:  2013-08-22     Revised Date:  2014-09-12    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  749-59     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
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MeSH Terms
Image Enhancement / instrumentation*
Image Interpretation, Computer-Assisted / instrumentation*
Imaging, Three-Dimensional / instrumentation*
Magnetic Resonance Imaging / instrumentation*
Magnetics / instrumentation*
Reproducibility of Results
Sensitivity and Specificity
Grant Support
P41 EB015898/EB/NIBIB NIH HHS; P41 RR019703/RR/NCRR NIH HHS; P41 RR019703/RR/NCRR NIH HHS; P41 RR019703-06/RR/NCRR NIH HHS; R01 CA111288/CA/NCI NIH HHS; R01 CA111288-01A1/CA/NCI NIH HHS; R01 CA111981/CA/NCI NIH HHS; R01 CA111981-01/CA/NCI NIH HHS; R01 CA111981-01/CA/NCI NIH HHS

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