MAGNETIZATION PREPARED RAPID GRADIENT-ECHO (MP-RAGE) MR IMAGING OF THE LIVER - COMPARISON WITH SPIN-ECHO IMAGING

被引：35
作者：
DELANGE, EE
MUGLER, JP
BERTOLINA, JA
GAY, SB
JANUS, CL
BROOKEMAN, JR
机构：
[1] Department of Radiology, University of Virginia Health Sciences Center, Charlottesville
来源：
MAGNETIC RESONANCE IMAGING | 1991年 / 9卷 / 04期
关键词：
MAGNETIC RESONANCE (MR); TECHNOLOGY; PULSE SEQUENCES; RAPID IMAGING; LIVER NEOPLASMS; MR STUDIES; LIVER;
D O I：
10.1016/0730-725X(91)90031-G
中图分类号：
R8 [特种医学]; R445 [影像诊断学];
学科分类号：
1002 ; 100207 ; 1009 ;
摘要：
We have implemented an MR technique that employs a rapid gradient echo sequence, preceded by magnetization preparation pulses to provide T1- and T2-weighted tissue contrast. With this technique, which can be identified as a member of a new family of pulse sequences, generically named Magnetization Prepared RApid Gradient Echo (MP-RAGE), very short repetition times are used, allowing acquisition times of less than one second and images virtually free of motion-induced artifacts during quiet respiration. Fifteen patients with known liver lesions (metastases, hemangiomas, and cysts) were examined using T1- and T2-weighted 2-dimensional MP-RAGE sequences, and the images were compared with conventional T1- and multi-echo T2-weighted spin-echo (SE) sequences. Signal difference-to-noise ratios (SD/Ns) of the lesions were calculated for all pulse sequences using corresponding axial images and were normalized for voxel volume. The mean normalized SD/Ns of the MP-RAGE sequences were generally comparable to those for the SE sequences. In addition, there were no noticeable respiratory artifacts on the MP-RAGE images whereas these were clearly present on the T2-weighted SE images and to a lesser degree on the T1-weighted SE images. It is concluded that the MP-RAGE technique could become an important method for evaluating the liver for focal disease.
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页码：469 / 476
页数：8
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