用于射频扰相梯度回波成像中有效抑制伪影的扰相器梯度的矩和方向。

Moment and direction of the spoiler gradient for effective artifact suppression in RF-spoiled gradient echo imaging.

作者信息

Leupold Jochen, Hennig Jürgen, Scheffler Klaus

机构信息

Department of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Hugstetter Strasse 55, Freiburg, Germany.

出版信息

Magn Reson Med. 2008 Jul;60(1):119-27. doi: 10.1002/mrm.21614.

DOI:10.1002/mrm.21614

PMID:18581420

Abstract

Radiofrequency (RF) -spoiled gradient echo sequences were developed with the aim to produce images with T(1) weighted contrast within short acquisition time. Over the past two decades, this type of sequence has proven to be a robust technique and represents a reliable workhorse in clinical MRI. This study presents an analysis of ghost artifacts, which appear occasionally in RF-spoiled gradient echo images. It is demonstrated that the artifacts result from intrinsically emerging signal oscillations, which can be damped down by the application of spoiler gradients.

摘要

射频（RF）扰相梯度回波序列的开发旨在能在短采集时间内生成具有T(1)加权对比度的图像。在过去二十年中，这种序列已被证明是一种可靠的技术，是临床磁共振成像中可靠的常用方法。本研究对偶尔出现在射频扰相梯度回波图像中的鬼影伪影进行了分析。结果表明，这些伪影是由内在出现的信号振荡引起的，通过应用扰相梯度可以抑制这些振荡。