大螺距双源CT采用bolus-tracking团注法冠状动脉成像的可行性

目的 评价应用缩短呼吸指令时间的团注示踪法(bolus-tracking)行大螺距双源CT冠状动脉成像(CCTA)获得图像的增强效果及有效辐射剂量.方法 收集临床疑诊为冠状动脉性心脏病的184例患者,随机平均分为两组:A组92例,采用大螺距前瞻性心电门控螺旋扫描(Flash Spiral)模式、缩短呼吸指令时间的bolus-t racking法扫描；B组92例,采用测试团注法(test-bolus)扫描.对两组图像的主动脉根部CT值、图像噪声、CNR及有效辐射剂量进行统计学比较.结果 两组图像主动脉根部CT值、图像噪声、CNR间的差异均无统计学意义(P均＞0.05).两组触发时、扫描过程中辐射剂量差异均无统计学意义(P均＞0.05).结论 双源CT大螺距前瞻性心电门控螺旋扫描CCTA中,采用缩短呼吸指令时间的bolus-tracking法可获得与test-bolus法相近的图像增强效果,而对比剂用量进一步减低.

Feasibility of bolus-tracking technique in coronary computed tomography angiography with high-pitch dual-source CT

Objective To assess the enhancement effect and radiation doses of coronary computed tomography angiography (CCTA) using bolus-tracking technique shortened instructional time of respiration with high-pitch dual-source CT (DSCT). Methods Totally 184 patients of suspected coronary artery disease were collected, and were randomly divided into two groups. Patients in group A (n=92) underwent CCTA using bolus-tracking technique shortened instructional time of respiration with high-pitch spiral acquisition mode (Flash Spiral mode), while in group B (n=92) underwent CCTA using test-bolus technique. CT value of the ascending aorta, image noise, CNR and radiation doses of two groups were assessed. Results There was no significant difference for CT value of the ascending aorta, image noise, CNR between the two groups (all P>0.05). There were no significant differences in the radiation dose of dynamic monitoring scans and the angiographic between the two groups (all P>0.05). Conclusion In high-pitch DSCT, comparing with test-bolus technique, bolus-tracking technique and shortened instructional time of respiration can acquire similar enhancement effect, while the average effective radiation dose of dynamic monitoring scans and contrast medium volume are significantly reduced.