Contrast enhanced high resolutional magnetic resonance angiography of the pelvis and lower extremities

通过结合使用零填充插值和测试注射来进行最佳注射时间估计，骨盆和下肢的MR血管造影术（MRA）已成为一种可行的工具，可以提供高质量的选择性动脉图像，即使使用造影剂团注也不会重叠静脉结构。通过重复这种成像技术，具有时间分辨率的3D-MRA已经变得可用。这种成像方法也可以用于身体的其他部位，包括颈部、胸部和上腹部。MRA在这一区域的最大问题之一是在弥漫性动脉疾病如动脉硬化闭塞症的情况下覆盖动脉系统的长段。移动床系统的引入使得在单次造影剂注射下连续成像三到四个区域成为可能。用20 ml Gd-螯合物获得了临床上可行的图像，该方法不仅对动脉硬化闭塞症，而且对骨盆和下肢的动脉瘤或其他各种异常的评估非常有用。报告并发表了动脉信号分布和腹主动脉瘤临床有效性的早期经验（参考文献8、9）。

With combined use of zero-filled interpolation and test injection for optimum injection timing estimation, MR angiography (MRA) of the pelvis and lower extremity has become a feasible tool to provide high quality selective arterial images without overlapping venous structures even with bolus injection of contrast medium. By repeating this imaging technique, 3D-MRA with time resolution has become available. Such imaging method was also possible in rest of the body including neck, chest, and upper abdomen.One of the largest problems of the MRA in this area was to cover long segments of arterial system in cases of diffuse arterial disease such as arteriosclerosis obliterance. Introduction of moving-table system made it possible to image three to four areas sequentially under a single contrast injection. With 20 ml Gd-chelate clinically feasible images were obtained and this method was extremely useful for assessment of not only arteriosclerosis obliterance but also aneurysm or other various abnormalities of the pelvis and lower extremities. The early experiences as for arterial signal distribution and clinical effectiveness for abdominal aortic aneurysms were reported and published (reference 8,9).