Korinek Radim, Bartusek Karel, Starcuk Zenon
Institute of Scientific Instruments of the CAS, v. v. i., Czech Republic.
Institute of Scientific Instruments of the CAS, v. v. i., Czech Republic.
Magn Reson Imaging. 2017 Apr;37:164-170. doi: 10.1016/j.mri.2016.11.015. Epub 2016 Nov 24.
A number of 'Dixon' techniques based on fast spin echo (FSE) sequence have been proposed and successfully used in many branches of medicine. Some require only one scan, but most of them need multiple scans and long scan times. This article describes a new fast triple-spin-echo Dixon (FTSED) technique suitable for ultra-high field MRI, in which three specific time shifts are introduced in the echo train; thus, three images with defined water-fat phase-differences (0, π, 2π) are encoded in the phase of the acquired images without extreme restrictions upon the echo duration. The water and fat images are then calculated by iterative least-squares estimation method. The sequence was successfully implemented at a 9.4T ultra-high field MRI system and tested on a phantom and a rat.
基于快速自旋回波（FSE）序列的多种“狄克逊”技术已被提出并成功应用于医学的许多分支。有些技术仅需一次扫描，但大多数需要多次扫描且扫描时间较长。本文介绍了一种适用于超高场MRI的新型快速三重自旋回波狄克逊（FTSED）技术，该技术在回波链中引入了三个特定的时间偏移；因此，在采集图像的相位中编码了具有定义好的水脂相位差（0、π、2π）的三张图像，而对回波持续时间没有极端限制。然后通过迭代最小二乘估计方法计算出水相和脂肪相图像。该序列已在9.4T超高场MRI系统上成功实现，并在体模和大鼠上进行了测试。
