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目的比较相同碘浓度和注射流率、不同对比剂注射方案情况下,主动脉多层螺旋CT血管成像(MSC-TA)的应用效果。资料与方法将90例可疑主动脉病变患者随机分为A、B、C3组(每组30例),在对比剂浓度300mgI/ml、注射流率3ml/s相同的情况下,分别采用不同的注射方案行主动脉MSCTA。A组:注射对比剂100ml;B组:注射对比剂60ml后用40ml生理盐水冲刷;C组:注射对比剂85ml。扫描延迟时间采用自动触发技术。测量升主动脉、T7及L2水平降主动脉、主动脉分叉处CT值;由两位影像诊断高级职称医师对血管强化程度、重组血管清晰度进行评价。结果3种注射方案在升主动脉、T7及L2水平降主动脉、主动脉分叉处的平均强化程度分别为255HU、240HU、247HU,3组间差异无统计学意义,3组重组血管清晰度差异无统计学意义,93.33%(84/90)清楚显示两侧肾动脉及分支,6.67%(6/90)显示两侧肾动脉及分支欠清楚。结论应用对比剂60ml注射+40ml生理盐水冲刷行主动脉MSCTA能够满足主动脉检查要求,减少了对比剂的用量。
Objective To compare the effect of multi-slice spiral CT angiography (MSC-TA) with the same iodine concentration and injection rate under different contrast injection protocols. Materials and Methods 90 patients with suspected aortic lesions were randomly divided into A, B and C3 groups (30 in each group). When the contrast medium concentration was 300mgI / ml and the injection rate was 3ml / s, Injection schedule aorta MSCTA. Group A: injection of contrast agent 100ml; Group B: injection of contrast agent 60ml after flushing with 40ml saline; Group C: injection of contrast agent 85ml. Scan delay time using automatic triggering technology. Measurement of ascending aorta, T7 and L2 levels descending aorta, aortic bifurcation CT value; by the two senior doctors of imaging diagnosis of vascular enhanced degree of recombinant vascular clarity were evaluated. Results The average intensities of ascending aorta, T7 and L2 in descending aorta and aortic bifurcation were 255HU, 240HU and 247HU, respectively. There was no significant difference among the three groups. There were no significant differences among the three groups The difference was not statistically significant. 93.33% (84/90) clearly showed bilateral renal arteries and branches, and 6.67% (6/90) showed unclear renal arteries and branches on both sides. Conclusion The contrast agent 60ml injection + 40ml saline flushing aortic MSCTA can meet the requirements of aorta examination, reducing the amount of contrast agent.