Miyazaki M, Sugiura S, Tateishi F, Wada H, Kassai Y, Abe H
MR Engineering Department, Medical Systems Division, Toshiba, Tochigi 324-8550, Japan.
J Magn Reson Imaging. 2000 Nov;12(5):776-83. doi: 10.1002/1522-2586(200011)12:5<776::aid-jmri17>3.0.co;2-x.
A non-contrast-enhanced three-dimensional (3D) magnetic resonance angiography (MRA) technique, which acquires images in a reasonably short scanning time and requires no contrast agent, is developed. An electrocardiographically (ECG) synchronized 3D half-Fourier fast spin-echo (FSE) technique with an appropriate ECG delay time for every slice encoding in 3D terms was used to examine the thoracic and iliac regions in 16 healthy volunteers at both 0.5 and 1.5 T. Prior to each 3D fresh blood imaging (FBI) experiment, an ECG preparation (ECG-prep) scan was acquired, and an appropriate ECG triggering time was selected for 3D FBI acquisition to optimize visualization of the vessel of interest. In the thoracic and abdominal regions, good-quality 3D MRA images were obtained. Furthermore, the weighted subtraction of two images in different phases provides contrast enhancement between arteries and veins.
一种非对比增强三维（3D）磁共振血管造影（MRA）技术被研发出来，该技术能在相当短的扫描时间内获取图像且无需使用造影剂。采用一种心电图（ECG）同步的3D半傅里叶快速自旋回波（FSE）技术，针对3D中每个层面编码设置适当的ECG延迟时间，在0.5T和1.5T场强下对16名健康志愿者的胸部和髂部区域进行检查。在每次3D新鲜血液成像（FBI）实验前，先进行一次ECG准备（ECG-prep）扫描，并为3D FBI采集选择合适的ECG触发时间，以优化感兴趣血管的可视化。在胸部和腹部区域，获得了高质量的3D MRA图像。此外，对不同相位的两幅图像进行加权相减可增强动静脉之间的对比度。
