METHOD AND SYSTEM FOR MULTIDIMENSIONAL LOCALIZATION AND FOR RAPID MAGNETIC RESONANCE SPECTROSCOPIC IMAGING

摘要

A method and system for providing prelocalization of a volume of interest and for rapidly acquiring a data set for generating spectroscopic images. Spatial prelocalization of a volume of interest is achieved by providing a presuppression sequence before a stimulated echo (STE) sequence and a suppression sequence during the mixing time (TM) interval of the STE sequence. The presuppression sequence includes a spatial suppression sequence to selectively saturate slices that intersect the plane selected by the STE sequence in order to define a boundary for the volume of interest, and this spatial suppression sequence is substantially repeated during the TM interval of the STE sequence. Spectroscopic imaging data is acquired by an oversampled echo planar spatial-spectral imaging sequence in which the gradient reversal frequency is a integer factor of n greater than the gradient reversal frequency required to sample the spectral width. Each RF pulse of the STE sequence excites spins in substantially the same plane, and an adaptation of this STE sequence provides for acquiring multiple echoes at different effective echo times without compromising spatial localization of the different echoes.