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Contrast-enhanced whole-heart coronary magnetic resonance angiography (MRA) in less than 5 minutes using radial EPI
© Bhat et al; licensee BioMed Central Ltd. 2010
Published: 21 January 2010
Whole-heart coronary MRA is challenging due to the long data acquisition time on the order of 8-12 minutes. Interleaved EPI using Cartesian k-space sampling has been reported for reducing the scan time of whole-heart coronary MRA ; however, this method suffers from an increased sensitivity to motion artifacts . The purpose of this work was to optimize a radial EPI  technique for contrast-enhanced whole-heart coronary MRA, with the goal of combining the scan efficiency of EPI with the motion insensitivity of radial sampling.
6 volunteers were scanned on a 3 T Trio scanner (Siemens Medical Solutions). Scan parameters were: 4 projections in each TR, TR = 8.2 ms, flip angle = 30, readout bandwidth = 977 Hz/pixel, number of radial views = 288 or 144 depending on the kz value, partial Fourier of 5/6 in the kz direction, inversion-recovery preparation with TI = 200 ms, matrix: 256 × 256 × 60, voxel size: 1 × 1 × 2 mm3. 0.2 mmol/kg of Gd-DTPA was injected at 0.3 cc/sec.
(n = 6)
Imaging time (mins)
Navigator efficiency (%)
4.9 ± 0.7
49.0 ± 8.0
27.0 ± 4.0
14.0 ± 1.3
9.3 ± 1.7
9.3 ± 2.3
A radial EPI sequence was developed for contrast-enhanced whole-heart coronary MRA in a scan time under 5 minutes.
This article is published under license to BioMed Central Ltd.