Free-breathing whole-heart coronary MRA with 3D radial SSFP and self-navigated image reconstruction
Respiratory motion is a major source of artifacts in cardiac magnetic resonance imaging (MRI). Free‐breathing techniques with pencil‐beam navigators efficiently suppress respiratory motion and minimize the need for patient cooperation. However, the correlation between the measured navigator position...
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Published in | Magnetic resonance in medicine Vol. 54; no. 2; pp. 476 - 480 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.08.2005
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Subjects | |
Online Access | Get full text |
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Summary: | Respiratory motion is a major source of artifacts in cardiac magnetic resonance imaging (MRI). Free‐breathing techniques with pencil‐beam navigators efficiently suppress respiratory motion and minimize the need for patient cooperation. However, the correlation between the measured navigator position and the actual position of the heart may be adversely affected by hysteretic effects, navigator position, and temporal delays between the navigators and the image acquisition. In addition, irregular breathing patterns during navigator‐gated scanning may result in low scan efficiency and prolonged scan time. The purpose of this study was to develop and implement a self‐navigated, free‐breathing, whole‐heart 3D coronary MRI technique that would overcome these shortcomings and improve the ease‐of‐use of coronary MRI. A signal synchronous with respiration was extracted directly from the echoes acquired for imaging, and the motion information was used for retrospective, rigid‐body, through‐plane motion correction. The images obtained from the self‐navigated reconstruction were compared with the results from conventional, prospective, pencil‐beam navigator tracking. Image quality was improved in phantom studies using self‐navigation, while equivalent results were obtained with both techniques in preliminary in vivo studies. Magn Reson Med 54:476–480, 2005. © 2005 Wiley‐Liss, Inc. |
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Bibliography: | istex:5961FF68BC8604D9A212D50C2E897D6665018E1D Whitaker Foundation - No. RG-02-0745 ArticleID:MRM20557 German Academic Exchange Service National Institutes of Health - No. HL61912 Donald W. Reynolds Foundation ark:/67375/WNG-X9SNT3KG-X ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0740-3194 1522-2594 |
DOI: | 10.1002/mrm.20557 |