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- Title
3D velocity quantification in the heart: Improvements by 3D PC-SSFP.
- Authors
Rolf, Marijn P.; Hofman, Mark B.M.; Kuijer, Joost P.A.; van Rossum, Albert C.; Heethaar, Rob M.
- Abstract
Purpose: To test whether a 3D imaging sequence with phase contrast (PC) velocity encoding based on steady-state free precession (SSFP) improves 3D velocity quantification in the heart compared to the currently available gradient echo (GE) approach. Materials and Methods: The 3D PC-SSFP sequence with 1D velocity encoding was compared at the mitral valve in 12 healthy subjects with 3D PC-GE at 1.5T. Velocity measurements, velocity-to-noise-ratio efficiency (VNReff), intra- and interobserver variability of area and velocity measurements, contrast-to-noise-ratio (CNR), and artifact sensitivity were evaluated in both long- and short-axis orientation. Results: Descending aorta mean and peak velocities correlated well ( r2 = 0.79 and 0.93) between 3D PC-SSFP and 3D PC-GE. At the mitral valve, mean velocity correlation was moderate ( r2 = 0.70 short axis, 0.56 long axis) and peak velocity showed good correlation ( r2 = 0.94 short axis, 0.81 long axis). In some cases VNReff was higher, in others lesser, depending on slab orientation and cardiac phase. Intra- and interobserver variability was generally better for 3D PC-SSFP. CNR improved significantly, especially at end systole. Artifact levels did not increase. Conclusion: 3D SSFP velocity quantification was successfully tested in the heart. Blood-myocardium contrast improved significantly, resulting in more reproducible velocity measurements for 3D PC-SSFP at 1.5T. J. Magn. Reson. Imaging 2009;30:947-955. © 2009 Wiley-Liss, Inc.
- Publication
Journal of Magnetic Resonance Imaging, 2009, Vol 30, Issue 5, p947
- ISSN
1053-1807
- Publication type
Article
- DOI
10.1002/jmri.21933