对比剂不同注射流率对膈下动脉CT血管成像的影响

Influence of Different Contrast Media Injection Rate on CT Angiography of Inferior Phrenic Artery

目的比较对比剂3种不同注射流率对膈下动脉(inferior phrenic artery,IPA)CTA成像图像质量的影响。方法选择90例行腹部CTA患者,随机分为3、4、5ml/s组,对比剂(350mg I/ml)用量为1.0ml/kg。记录各组IPA各级血管的显示情况,测量各组RIPA 1级血管及2级血管的CT值。结果 90例均扫描成功。3、4和5ml/s组对于IPA 1级、2级血管的显影差异无统计学意义(P>0.05),3ml/s和4ml/s组对于IPA各级血管的显示差异无统计学意义(P>0.05),5ml/s组IPA 3级及其以上分支显示明显高于4和3ml/s组,差异有统计学意义(P>0.05),5ml/s组1级血管及2级血管CT值明显高于4ml/s和3ml/s组,差异有统计学意义(P<0.05);4ml/s组高于3ml/s组,差异无统计学意义(P>0.05)。结论 5ml/s的注射流率能显著提高IPA管腔密度,有助于IPA 3级及其以上分支更好地显示,可为研究IPA本身及相关疾病引发IPA改变提供较清晰的影像学图像。

Objective To evaluate the influence of three kinds of contrast medium injection rate to the image quality of IPA. Methods Ninety patients who were under gone abodomen computed tomography angiography（CTA） were divided randomly into three groups according to different contrast media injection rate （3 ml/s,4ml/s,5ml/s）. The contrast medium dose was calculated by 1.0ml/kg. The scanning results of branches of IPA in every group were recorded and the CT values of the first and second levels of RIPA were meas- ured. Results Ninety patients were all scaned successfully. There was no statistical significance in showing the first and second levels of IPA in three groups. There was no statistical significance in showing every branches of IPA in the groups of 3ml/s and 4ml/s. The image quality of the third or more levels of IPA in 5ml/s group were obviously better than the other two groups, and there was statistical signifi- cance. In the terms of the CT values of the first and second levels of IPA, the 5ml/s group were obviously higher than the other groups, and there was statistical significance. The 4ml/s group were higher than 3ml/s group, and there was no statistical significance. Conclu- sion It can obviously increase the luminal density of IPA using 5ml/s contrast medium injection rate,contribute to the better showing of the third or more levels of IPA and provide the distinct image of IPA for the research or the diagnosis of some diseases,which can lead to the change of IPA.