Variation of number and duration of gradient read times during a single pulse sequence for proton density and T.sub.2 -weighted images

摘要

The gradient read time is varied during the course of a single pulse sequence in which both proton density weighted image data and T.sub. 2 - weighted image data are collected. The number of gradient refocussings after each RF refocussing pulse in a gradient spin echo pulse sequence is changed during the course of the pulse sequence.