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目的 应用不同对比剂注射方式进行胸廓内动脉CTA扫描成像,探寻相对较好的静脉对比剂注射方法.方法 采用随机原则对临床行胸廓内动脉成像的160例患者进行分组(A、B组),A、B组各80例患者,进行CTA成像.A组:双期注射方式,一期根据(体重×1.0ml/kg)ml对比剂静脉注入,而后无间隔追加20ml生理盐水;B组:双期注射方式,一期根据(体重×1.0ml/kg-10)ml对比剂静脉注入,而后无缝隙追加20ml混合剂(1:1盐水-对比剂).分析比较二组CTA图像锁骨下动脉起始部及胸廓内动脉近、远处CT值差异有无统计学意义,同时比较二组对比剂注射方法所用对比剂量,并对图像质量进行评价.结果 两种注射方式所得图像,锁骨下动脉起始部及胸廓内动脉近、远段三部位CT 值比较,差异无统计学意义(P＞0.05).二组对比剂用量,A组平均(65.83±5.22)ml;B组平均(54.38±5.08)ml,二组比较差异有统计学意义(P＜0.05).两种注射方式所得图像质量比较,差异无统计学意义(P＞0.05).结论 应用双期合并混合剂的注射方式,既可有效降低对比剂用量,且未对胸廓内动脉图像质量产生影响,对胸廓内动脉相关疾病诊断具有一定价值.“,”Objective To apply different contrast agent injection to CTA scan of internal thoracic artery,and search for a better contrast medium injection way.Methods Totally 160 patients were randomly divided into two groups:group A and group B,80 cases in each group.Group A received two phase injection,one phase based on body weight×1.0ml/kg contrast intravenous injection,and no crevice supplemental 20ml saline; while group B received two phase injection mode,one phase (weight×1.0ml/kg-10) ml 50ml contrast agent intravenous injection,and then no gap plus 20ml mixture (1:1 salt-contrast agent).The analysis and comparison of the two groups of CTA images of the subclavian artery and the proximal and distant CT values of the internal thoracic artery were not statistically significant.At the same time,the dosage of contrast agent was compared between the two groups of contrast agents and the quality of the images was evaluated.Results there were no significant difference in CT value between the two injection modes,the proximal and distal two segments of the subclavian artery and the internal thoracic artery (P＞0.05).The average dosage of contrast agents in the two groups was statistically significant (P＜0.05),group A:65.83±5.22ml;group B,54.38± 5.08ml.There was no significant difference in image quality between the two injection modes (P＞0.05).Conclusion The use of double phase mixture injection can effectively reduce the dosage of contrast agent without affecting the image quality,and it is of certain value for the diagnosis of internal thoracic artery related diseases.