Density-weighted concentric rings k-space trajectory for ¹ H magnetic resonance spectroscopic imaging at 7 T.

ABSTRACT: It has been shown that density-weighted (DW) k-space sampling with spiral and conventional phase encoding trajectories reduces spatial side lobes in magnetic resonance spectroscopic imaging (MRSI). In this study, we propose a new concentric ring trajectory (CRT) for DW-MRSI that samples k-space with a density that is proportional to a spatial, isotropic Hanning window. The properties of two different DW-CRTs were compared against a radially equidistant (RE) CRT and an echo-planar spectroscopic imaging (EPSI) trajectory in simulations, phantoms and in vivo experiments. These experiments, conducted at 7 T with a fixed nominal voxel size and matched acquisition times, revealed that the two DW-CRT designs improved the shape of the spatial response function by suppressing side lobes, also resul

SUBMITTER: Chiew M 

PROVIDER: S-EPMC5969060 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature