Reproducibility of 7T human cardiac 3D 31P-MRSI using concentric ring k-space trajectories (CRT).

Cardiac 31P-MRS provides insight into metabolism of the failing heart. The commonly employed 3D-MRSI acquisitions are rather slow, even at 7T. Fast readout trajectories, such as concentric ring (CRT) have been recently suggested to substitute the slow Cartesian sampling (CSI), however their repeatability is yet unknown. Our preliminary data suggest comparable intra-session repeatability, but somewhat lower inter-session repeatability for mid septal voxels using 2.5 min CRT in comparison to 6.5 min CSI. Similar trends were observed for higher resolution CRT.