Comparison of 1.5 and 3.0 T for contrast-enhanced pulmonary magnetic resonance angiography.
Comparison of 1.5 and 3.0 T for contrast-enhanced pulmonary magnetic resonance angiography.
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DOI：
10.1177/1076029611419840
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发表时间：
2012-03
期刊：
影响因子：
--
通讯作者：
Chenevert TL
中科院分区：
文献类型：
--
作者：
Londy FJ;Lowe S;Stein PD;Weg JG;Eisner RL;Leeper KV;Woodard PK;Sostman HD;Jablonski KA;Fowler SE;Hales CA;Hull RD;Gottschalk A;Naidich DP;Chenevert TL
在最近的一项钆对比增强磁共振血管造影术（Gd-MRA）诊断急性肺栓塞（PE）的多中心试验中，两个中心使用了一个共同的MRI平台，尽管场强不同（1.5T和3 T），并使用3 T平台实现了信噪比增益。该回顾性分析研究了肺血管靶点的信噪比增益。将在一家机构的1.5T系统上采集的30次连续肺部MRA检查与在另一家机构的3 T系统上采集的30次连续肺部MRA检查进行比较。两个系统均来自同一MRI制造商，并且均使用相同的Gd-MRA脉冲序列，尽管由于场强差异而进行了一些方案调整。在主肺动脉、4条肺静脉、胸主动脉和背景肺上手动定义感兴趣区域，以客观测量中心之间的信噪比、对比度噪声和推注时间偏倚。与1.5T相比，3 T肺MRA方案实现了更高的空间分辨率，但在主要肺血管中保持了显著更高的信噪比（≥ 13%，p = 0.03）。没有证据表明两组之间的推注时间或患者血流动力学差异存在操作员偏倚。相对于1.5T，3 T Gd-MRA可以获得更高的空间分辨率，并具有持续或更高的增强血管的信噪比。
In a recent multi-center trial of gadolinium contrast-enhanced magnetic resonance angiography (Gd-MRA) for diagnosis of acute pulmonary embolism (PE), two centers utilized a common MRI platform though at different field strengths (1.5T and 3T) and realized a signal-to-noise gain with the 3T platform. This retrospective analysis investigates this gain in signal-to-noise of pulmonary vascular targets. Thirty consecutive pulmonary MRA examinations acquired on a 1.5T system at one institution were compared to 30 consecutive pulmonary MRA examinations acquired on a 3T system at a different institution. Both systems were from the same MRI manufacturer and both used the same Gd-MRA pulse sequence, although there were some protocol adjustments made due to field strength differences. Region-of-interests were manually defined on the main pulmonary artery, 4 pulmonary veins, thoracic aorta, and background lung for objective measurement of signal-to-noise, contrast-to-noise, and bolus timing bias between centers. The 3T pulmonary MRA protocol achieved higher spatial resolution yet maintained significantly higher signal-to-noise ratio (≥ 13%, p = 0.03) in the main pulmonary vessels relative to 1.5T. There was no evidence of operator bias in bolus timing or patient hemodynamic differences between groups. Relative to 1.5T, higher spatial resolution Gd-MRA can be achieved at 3T with a sustained or greater signal-to-noise ratio of enhanced vasculature.
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