Patent ID: 6127825
Filing Date: 2000-10-03
Classification: G01R

Abstract:
A split echo train method of phase shift correction, comprising the steps of:emitting an excitation pulse;emitting an inversion pulse;applying an encode gradient to a phase axis, said encode gradient comprising a former part encode gradient and a latter part encode gradient;applying a read gradient to a read axis, said read gradient comprising a former part read gradient and a latter part read gradient;sampling data from a plurality of echoes comprising a former part echo and a latter part echo;applying a rewind gradient to said phase axis;repeating the foregoing steps a plurality of times;producing a first image based on sampled data from said former part echo and a second image based on sampled data from said latter part echo; andcorrecting first order phase shift of said latter part echo caused by said former part or preceding encode gradient and said rewind gradient, by placing a compensation pulse before said former part echo and at a position selected from the group consist of immediately before said encode gradient, in said encode gradient, immediately following said encode gradient, immediately before said rewind gradient, in said rewind gradient, and immediately following said rewind gradient.