Carriero A, Scarabino T, Magarelli N, Giannatempo G, Vizzani F, Cammisa M, Salvolini U, Bonomo L
Istituto di Scienze Radiologiche e Formazione dell'Immagine, Università G. D'Annunzio, Chieti.
Radiol Med. 1997 Oct;94(4):319-24.
We tried to optimize the technique of contrast enhanced MR Angiography (MRA) in the study of the main body arteries.
Fifty volunteers were examined with contrast enhanced MRA with a superconductive magnet at 1.5 T (Signa GE) and 3D SPGR sequences acquired with the following parameters: TR 8.2 +/- 1.3 ms, TE 1.8 +/- 7 ms, FA 60 degrees, MA 128 X 256; the images were acquired on the sagittal or coronal planes. The contrast agent (Gd-DTPA) was injected with MedRad Spectris system, with the bolus technique and the following standard parameters: velocity 1.5 mL/s and single dose; circulation time was optimized with 2D SPGR for each vessel (pretest). The carotid and pulmonary arteries, the thoracic-abdominal aorta and the iliac arteries were studied. The reader used a multiple choice card to evaluate image quality, signal-to-noise ratio (SNR) and circulation time.
Circulation time was 10.2 s in the carotid arteries, 8.1 s in the pulmonary arteries, 10.3 s in the thoracic aorta, 12.2 s in the abdominal aorta and 13.8 s in the iliac arteries. The signal was 181.8 vs the noise 3.1 in the carotid arteries, 256.8 vs 23.2 in the thoracic aorta, 518.4 vs 23.5 in the pulmonary arteries, 258.8 vs 24.5 in the abdominal aorta and finally 262.7 vs 25.4 in the iliac arteries.
Our experience suggests that contrast enhanced MRA is a good technique to study body arteries.
我们试图在主体动脉研究中优化对比增强磁共振血管造影（MRA）技术。
50名志愿者接受了1.5T超导磁体（GE Signa）的对比增强MRA检查，并采用以下参数获取3D SPGR序列：TR 8.2±1.3毫秒，TE 1.8±7毫秒，翻转角60度，矩阵128×256；图像在矢状面或冠状面采集。造影剂（钆喷酸葡胺）通过MedRad Spectris系统注射，采用团注技术和以下标准参数：流速1.5毫升/秒，单剂量；通过二维SPGR对每个血管进行循环时间优化（预试验）。对颈动脉、肺动脉、胸主动脉、腹主动脉和髂动脉进行了研究。阅片者使用多选卡评估图像质量、信噪比（SNR）和循环时间。
颈动脉循环时间为10.2秒，肺动脉为8.1秒，胸主动脉为10.3秒，腹主动脉为12.2秒，髂动脉为13.8秒。颈动脉信号为181.8，噪声为3.1；胸主动脉信号为256.8，噪声为23.2；肺动脉信号为518.4，噪声为23.5；腹主动脉信号为258.8，噪声为24.5；髂动脉信号为262.7，噪声为25.4。
我们的经验表明，对比增强MRA是研究人体动脉的一种良好技术。
