RASEE：一种快速自旋回波脉冲序列。

RASEE: a rapid spin-echo pulse sequence.

作者信息

Bogdan A R, Joseph P M

机构信息

Department of Radiology, University of Pennsylvania, Philadelphia 19104-6086.

出版信息

Magn Reson Imaging. 1990;8(1):13-9. doi: 10.1016/0730-725x(90)90206-h.

DOI:10.1016/0730-725x(90)90206-h

PMID:2325511

Abstract

Most fast-imaging sequences use gradient echoes and a low flip-angle excitation. The low flip angle is used because it gives increased signal when TR less than T1. However, spin-echo sequences are less productive of certain artifacts, among them flow and magnetic susceptibility artifacts. We present a modification of the spin-echo pulse sequence designed to optimize the signal-to-noise ratio for repetition times (TR) less than 100 msec while preserving good image quality. Our implementation performs a 128 x 128 image in under 7 sec (TR = 50 msec) and has been used to follow the dynamics of Gd-DTPA in the rat kidneys.

摘要

大多数快速成像序列使用梯度回波和低翻转角激发。使用低翻转角是因为当TR小于T1时它能增加信号。然而，自旋回波序列产生某些伪影的可能性较小，其中包括血流和磁敏感性伪影。我们提出了一种自旋回波脉冲序列的改进方法，旨在针对小于100毫秒的重复时间（TR）优化信噪比，同时保持良好的图像质量。我们的实现方法能在7秒内（TR = 50毫秒）完成128×128的图像，并且已被用于跟踪大鼠肾脏中钆喷酸葡胺的动态变化。