METHOD OF OBTAINING THREE-DIMENSIONAL MR DATA

摘要

PROBLEM TO BE SOLVED: To remove the synchronous characteristic in both demodulation to thereby improve the quality of image by equally changing a Z-axis phase encode in all the signal between two respective RF refocosing pulses adjacent to each other in an MR pulse sequence. SOLUTION: In a 3D-GRASE type MR pulse sequence, phase encode along a Z-axis is equally changed between two adjacent RF reforcusing pulses while in-plane phase encode is changed monotonously from the start to the end of MR sequence without the change between two RF refocussing pulses. Accordingly, temporal decrease of amplitude in Y band in a single plane of (k) space matrix caused by T2 decrease is prevented, and a temporal minus condition is obtained from the start to the end of MR pulse sequence. Consequently, the cyclic amplitude changing in 3D-k space data set is completely removed and the removement of AM image archifact is assured.