Lipid elimination with an echo-shifting N/2-ghost acquisition (LEENA) MRI.
Lipid elimination with an echo-shifting N/2-ghost acquisition (LEENA) MRI.
复制标题
通过回声偏移 N/2 重影采集 (LEENA) MRI 消除脂质。
DOI：
10.1002/mrm.25177
复制
发表时间：
2015
影响因子：
3.3
通讯作者：
Flask,ChrisA
中科院分区：
文献类型：
--
作者：
Lu,Lan;Donnola,ShannonB;Koontz,Michaela;Griswold,MarkA;Duerk,JeffreyL;Flask,ChrisA
目的狄克逊技术提供了均匀的水脂分离，但需要多个图像集，这延长了整体采集时间。在这里，一种替代的快速单次采集方法，脂质消除与回波移位N/2鬼采集（LEENA），介绍了methodsLEENA方法利用稳态自由进动序列的快速成像，以获得一个单一的k空间数据集，其中连续的k空间线被采集，以允许脂肪磁化旋进180°。然后使用图像域（LEENA-S）或k空间域（LEENA-G）并行成像技术对LEENA数据进行去重影，以重建仅水和仅脂肪图像。一个非共振校正技术被纳入，以提高水-脂肪separation.ResultsUniform的水-脂肪分离的均匀性实现了两个LEENA-S和LEENA-G方法的体模和人体和腿部成像应用在1.5T和3 T。所得的水和脂肪图像定性类似于传统的2点狄克逊和脂肪抑制images.ConclusionThe LEENA‐S和LEENA‐G方法提供统一的水和脂肪图像从一个单一的MRI采集。这些简单的方法可以适用于1.5T和3 T临床MRI扫描仪，并提供与传统的2点狄克逊和脂肪抑制技术相当的脂肪/水分离。Magn Reson Med 73：711-717，2015。© 2014 Wiley Periodicals，Inc.
PurposeThe Dixon techniques provide uniform water‐fat separation but require multiple image sets, which extend the overall acquisition time. Here, an alternative rapid single acquisition method, lipid elimination with an echo‐shifting N/2‐ghost acquisition (LEENA), was introduced.MethodsThe LEENA method utilized a fast imaging with steady‐state free precession sequence to obtain a single k‐space dataset in which successive k‐space lines are acquired to allow the fat magnetization to precess 180°. The LEENA data were then unghosted using either image‐domain (LEENA‐S) or k‐space domain (LEENA‐G) parallel imaging techniques to reconstruct water‐only and fat‐only images. An off‐resonance correction technique was incorporated to improve the uniformity of the water‐fat separation.ResultsUniform water‐fat separation was achieved for both the LEENA‐S and LEENA‐G methods for phantom and human body and leg imaging applications at 1.5T and 3T. The resultant water and fat images were qualitatively similar to conventional 2‐point Dixon and fat‐suppressed images.ConclusionThe LEENA‐S and LEENA‐G methods provide uniform water and fat images from a single MRI acquisition. These straightforward methods can be adapted to 1.5T and 3T clinical MRI scanners and provide comparable fat/water separation with conventional 2‐point Dixon and fat‐suppression techniques.Magn Reson Med 73:711–717, 2015. © 2014 Wiley Periodicals, Inc.