Simultaneous spatial and spectral selective excitation

TLDR

The authors implemented the pulse on a 1.5‑T scanner and incorporated it into a rapid gradient‑echo sequence that produces simultaneous water and fat images during a breath‑hold, noting its applicability to other sequences such as multislice water/fat and rapid k‑space scans. The pulse, designed to be simultaneously spatially and spectrally selective, yields rapid water/fat images that are free of the chemical‑shift artifacts at organ boundaries typically seen in conventional rapid imaging, as confirmed by the derived analytic response. © 1990 Academic Press, Inc.

Abstract

Abstract Using a k‐space interpretation of small‐tip excitation, a single excitation pulse has been designed that is simultaneously selective in space and resonant frequency. An analytic expression for the response of this pulse has been derived. The pulse has been implemented on a 1.5‐T imaging system. The pulse has been applied to a rapid gradient‐echo imaging sequence that forms both water and fat images within a breath‐holding interval. These rapid images are free of the chemical shift artifacts at organ boundaries that typically afflict conventional rapid images. The pulse can be applied to a variety of other sequences, such as multislice water/fat sequences and rapid k‐space scanning. © 1990 Academic Press, Inc.