Feasibility and performance of breath-hold 3D true-FISP coronary MRA using self-calibrating parallel acquisition

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Jaeseok ParkDebiao Li

Abstract

Spatial resolution in 3D breath-hold coronary MR angiography (MRA) is limited by imaging time. The purpose of this work was to investigate the feasibility of improving the spatial resolution of coronary MRA using generalized autocalibrating partially parallel acquisition (GRAPPA) and fast imaging with steady state precession (True-FISP) data acquisition. Coronary data were acquired in 10 healthy volunteers. In five volunteers, the data were fully acquired in k-space and decimated for GRAPPA with an outer reduction factor (ORF) of 2. The coil calibration in GRAPPA was improved by segmented least-squares fitting along the frequency-encoding direction. More than 5% of the total k-space lines were required for the calibration to achieve acceptable artifact suppression despite slightly lower signal-to-noise ratio (SNR). In another five volunteers, coronary data were obtained with both conventional and accelerated data acquisitions in the same imaging time. GRAPPA allowed a submillimeter in-plane resolution, and improved coronary artery definition with an acceptable loss of SNR. In conclusion, 3D breath-hold coronary MRA by GRAPPA and True-FISP is highly feasible.

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Citations

Nov 27, 2007·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Christian StehningKay Nehrke
Mar 12, 2005·Magnetic Resonance Imaging Clinics of North America·Thomas K F FooDavid M Thomasson
May 18, 2006·NMR in Biomedicine·Thoralf Niendorf, Daniel K Sodickson
Jul 21, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xiaoming BiDebiao Li
Aug 10, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ze WangJohn A Detre
Sep 9, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jaeseok ParkDebiao Li
Sep 28, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jaeseok ParkDebiao Li

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