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

结合零填充插值法和测试注射法估计最佳注射时机，骨盆和下肢MR血管成像(MRA)已成为一种可行的工具，即使在团注造影剂的情况下也可以提供高质量的选择性动脉图像，而不会重叠静脉结构。通过重复这种成像技术，具有时间分辨率的3D-MRA成为可能。这种成像方法也适用于身体其他部位，包括颈部、胸部和上腹部。在这一领域，MRA最大的问题之一是在动脉硬化闭塞症等弥漫性动脉疾病的情况下覆盖动脉系统的长节段。移动工作台系统的引入使得在一次对比度注射下连续成像三到四个区域成为可能。用20mlGd-螯合物可获得临床可行的图像，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畸形的诊断都是非常有用的。报告并发表了腹主动脉瘤动脉信号分布和临床疗效的早期经验(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).