Zech C J, Schoenberg S O, Herrmann K A, Dietrich O, Menzel M I, Lanz T, Wallnöfer A, Helmberger T, Reiser M F
Institut für Klinische Radiologie, Klinikum Grosshadern der Ludwig-Maximilian-Universität München.
Radiologe. 2004 Dec;44(12):1160-9. doi: 10.1007/s00117-004-1132-7.
This contribution provides an overview and imparts basic knowledge on pertinent technical developments in magnetic resonance imaging (MRI) of the liver: 3D sequences, respiratory triggering, parallel imaging, and 3 Tesla (3T). 3D sequences can be used as T1-weighted (T1w) sequences for analyzing dynamics of contrast enhancement or as T2w sequences for MR cholangiography. Consistent improvements in respiratory triggering make it possible to obtain good image quality on T2w scans even in patients unable to hold their breath. Parallel imaging as a universal technique to accelerate image acquisition is particularly appropriate for MRI of the liver, and it has been shown that the reduced acquisition time is not achieved at the expense of image quality. Further progress in MRI of the liver can be expected with use of the 3T systems, but hitherto irrelevant problems must still be solved. Overall the innovations presented here, applied alone or in combination, facilitate rapid, robust, and high-quality MRI diagnostic assessment of the liver.
本文对肝脏磁共振成像(MRI)的相关技术进展进行了综述并传授了基础知识:三维序列、呼吸触发、并行成像和3特斯拉(3T)。三维序列可作为T1加权(T1w)序列用于分析对比增强动力学,或作为T2w序列用于磁共振胆管造影。呼吸触发技术的持续改进使得即使在无法屏气的患者中,也能在T2w扫描上获得良好的图像质量。并行成像作为一种加速图像采集的通用技术,特别适用于肝脏MRI,并且已经表明减少采集时间并不会以牺牲图像质量为代价。使用3T系统有望在肝脏MRI方面取得进一步进展,但迄今仍需解决一些无关紧要的问题。总体而言,本文介绍的这些创新技术单独或联合应用,有助于对肝脏进行快速、可靠且高质量的MRI诊断评估。