Objective: To investigate the effect of different concentration contrast agents on the image quality of the lower extremity venography with multi-slice spiral CT. Methods: The patients received direct method lower extremity venous examination were collected from 2014 to 2016 in our hospital.The injection rate of contrast medium was 3ml / s,the delay time was 50s and the scanning time was 20s.The images were divid-ed into groups according to the different concentrations,and the original image data were acquired. The origi-nal image data were acquired and analyzed by image reconstruction. The images were evaluated and analyzed statistically. Results:In this group of 40 patients, 80 sides of the lower extremity deep vein, the scores of each group were as follows: the concentration of 1: 4 group, 1 points for 13.04%, 2 points for 52.17%, 3 points for 34.79%;concentration of 1:6 group,1 points for the 11.11%,2 points for 22.22%,3 points for the 66.67%;the concentration of 1:7 group,1 point for 18.18%,2 points for 18.18%,3 points for 63.64%;the concentration of 1:9 group,1 points for the 0,2 points for 24%,3 points for 76% cases. Conclusion: This study demonstrates the use of contrast media at a contrast agent concentration of 1:6,1:7,1:9 can get a clear image of blood vessels.But the concentration of contrast agent set 1:9 not only can provide the best clin-ical image data,but also reduce the amount of contrast agent,can be considered the best venous CTV of the lower extremity concentration.%目的:探讨多层螺旋CT 直接法下肢静脉造影检查时,不同浓度对比剂对图像质量的影响.方法:收集2014年至2016年经直接法下肢静脉检查的患者,对比剂注射速率为3mL/s,延时时间50s,扫描时间20s,按照不同浓度进行分组,获取原始图像数据,并经后处理进行图像重建分析,对所获图像进行评估并进行统计学分析.结果:本组患者共40例,80侧下肢深静脉,其中各组的评分结果如下,其中浓度1:4(对比剂碘帕醇370mgI/mL与生理盐水的稀释比例)组中,1分的为13.04%,2分的为52.17%,3分的为34.79%;浓度1:6组中,1分的为11.11%,2分的为22.22%,3分的为66.67%,其中浓度1:7组中,1分的为18.18%,2分的为18.18%,3分的为63.64%;其中浓度1:9组中,1分的为0,2分的为24%,3分的为76%;结论:本研究表明应用对比剂浓度1:6、1:7、1:9的对比剂,均可获得清晰的血管影像,但对比剂浓度设置1:9时不仅可为临床提供最佳的影像资料,而且减少了对比剂用量,可被认为是下肢静脉CTV的最佳浓度.
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