Title | Direct monitoring of coronary artery motion with cardiac fat navigator echoes. |
Publication Type | Journal Article |
Year of Publication | 2003 |
Authors | Nguyen TD, Nuval A, Mulukutla S, Wang Y |
Journal | Magn Reson Med |
Volume | 50 |
Issue | 2 |
Pagination | 235-41 |
Date Published | 2003 Aug |
ISSN | 0740-3194 |
Keywords | Adipose Tissue, Adult, Artifacts, Coronary Vessels, Humans, Magnetic Resonance Angiography, Motion, Pericardium |
Abstract | Navigator echoes (NAVs) provide an effective means of monitoring physiological motion in magnetic resonance imaging (MRI). Motion artifacts can be suppressed by adjusting the data acquisition accordingly. The standard pencil-beam NAV has been used to detect diaphragm motion; however, it does not monitor cardiac motion effectively. Here we report a navigator approach that directly measures coronary artery motion by exciting the surrounding epicardial fat and sampling the signal with a k-space trajectory sensitized to various motion parameters. The present preliminary human study demonstrates that superior-inferior (SI) respiratory motion of the coronary arteries detected by the cardiac fat NAV highly correlates with SI diaphragmatic motion detected by the pencil-beam NAV. In addition, the cardiac fat navigator gating is slightly more effective than the diaphragmatic navigator gating in suppressing motion artifacts in free-breathing 3D coronary MR angiography (MRA). |
DOI | 10.1002/mrm.10550 |
Alternate Journal | Magn Reson Med |
PubMed ID | 12876698 |
Related Institute:
MRI Research Institute (MRIRI)