Goyen M, Laub G, Ladd M E, Debatin J F, Barkhausen J, Truemmler K H, Bosk S, Ruehm S G
Department of Diagnostic Radiology, University Hospital Essen, Essen, Germany.
J Magn Reson Imaging. 2001 Mar;13(3):372-7. doi: 10.1002/jmri.1053.
Although 3D MRA has been shown to provide excellent depiction of the pulmonary arterial tree, its clinical use has been limited due to lengthy breath-holding requirements. Employing the newest gradient generation (1.5 T MR system, amplitude of 40 mT/m and a slew rate of 200 mT/m/msec), we evaluated a technique permitting the dynamic acquisition of 3D data sets of the entire pulmonary tree in under 4 seconds. Coronal image sets were collected using a repetition time of 1.64 msec and an echo time of 0.6 msec, resulting in an acquisition time of 3.74 seconds. Three volunteers and eight dyspneic patients with known or suspected pulmonary embolism underwent MRI of the pulmonary arteries. The pulmonary arterial tree was visible to a subsegmental level in all examined subjects. Regarding the presence of pulmonary emboli in four patients, there was complete concordance between MR angiographic findings and those of corroborative studies. We conclude that diagnostic MRA of the pulmonary vasculature can be obtained even in patients with severe respiratory distress.
尽管三维磁共振血管造影（3D MRA）已被证明能出色地描绘肺动脉树，但其临床应用因对屏气时间要求较长而受到限制。利用最新的梯度生成技术（1.5 T磁共振系统，幅度为40 mT/m， slew率为200 mT/m/毫秒），我们评估了一种能在4秒内动态采集整个肺动脉树三维数据集的技术。使用重复时间为1.64毫秒、回波时间为0.6毫秒采集冠状图像集，采集时间为3.74秒。三名志愿者和八名已知或疑似肺栓塞的呼吸困难患者接受了肺动脉磁共振成像（MRI）检查。在所有检查对象中，肺动脉树可见至亚段水平。对于四名患者中肺栓塞的存在情况，磁共振血管造影结果与确证性研究结果完全一致。我们得出结论，即使是患有严重呼吸窘迫的患者也能获得肺部血管的诊断性MRA。
