Non-contrast-enhanced hepatic MR angiography: Do two-dimensional parallel imaging and short tau inversion recovery methods shorten acquisition time without image quality deterioration?
Non-contrast-enhanced hepatic MR angiography: Do two-dimensional parallel imaging and short tau inversion recovery methods shorten acquisition time without image quality deterioration?
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DOI：
10.1016/j.ejrad.2009.05.051
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发表时间：
2011-01-01
影响因子：
3.3
通讯作者：
Togashi, Kaori
中科院分区：
文献类型：
--
作者：
Shimada, Kotaro;Isoda, Hiroyoshi;Togashi, Kaori
目的：探讨采用二维(2D)并行成像(PI)和短tau反转恢复(STIR)方法，在不降低图像质量的前提下，缩短选择性肝动脉成像的采集时间。材料和方法：24例健康志愿者。采用1D或2D-PI和化学位移选择(CHESS)或STIR方法进行脂肪抑制，采用时空标记反转脉冲进行三维真稳态自由进动成像。对A组(1D-PI因子2和CHESS)、B组(2D-PI因子2×2和CHESS)和C组(2D-PI因子2×2和STIR)三组不同扫描条件进行比较。结果：A、B、C组的平均扫描时间分别为9.5±1.0min(平均+/-1.0min)、5.9+/-0.8min、5.8+/-0.5min，B、C组明显短于A组(P<0.01)。C组肝动脉对比度明显好于A、B组(P<；0.01)。B组的动脉显示评分和整体图像质量均低于A组和C组，其中4、8段的动脉分支差异有统计学意义(P<；0.05)，A组和C组的评分相近，差异无统计学意义。结论：2D-PI和STIR相结合的方法可以缩短选择性肝动脉成像的采集时间，且不会影响图像质量。这将有助于在临床实践中使用非对比增强的MRA。(C)2009爱思唯尔爱尔兰有限公司。保留所有权利。
Objective: To study whether shortening the acquisition time for selective hepatic artery visualization is feasible without image quality deterioration by adopting two-dimensional (2D) parallel imaging (PI) and short tau inversion recovery (STIR) methods.Materials and methods: Twenty-four healthy volunteers were enrolled. 3D true steady-state free-precession imaging with a time spatial labeling inversion pulse was conducted using 1D or 2D-PI and fat suppression by chemical shift selective (CHESS) or STIR methods. Three groups of different scan conditions were assigned and compared: group A (1D-PI factor 2 and CHESS), group B (2D-PI factor 2 x 2 and CHESS), and group C (2D-PI factor 2 x 2 and STIR). The artery-to-liver contrast was quantified, and the quality of artery visualization and overall image quality were scored.Results: The mean scan time was 9.5 +/- 1.0 min (mean +/- standard deviation), 5.9 +/- 0.8 min, and 5.8 +/- 0.5 min in groups A, B, and C, respectively, and was significantly shorter in groups B and C than in group A (P < 0.01). The artery-to-liver contrast was significantly better in group C than in groups A and B (P < 0.01). The scores for artery visualization and overall image quality were worse in group B than in groups A and C. The differences were statistically significant (P < 0.05) regarding the arterial branches of segments 4 and 8. Between group A and group C, which had similar scores, there were no statistically significant differences.Conclusion: Shortening the acquisition time for selective hepatic artery visualization was feasible without deterioration of the image quality by the combination of 2D-PI and STIR methods. It will facilitate using non-contrast-enhanced MRA in clinical practice. (c) 2009 Elsevier Ireland Ltd. All rights reserved.