目的:探讨团注(Bolus)技术在多层螺旋CT血管成像(multi-slice spiral CT angiography,MSCTA)最佳延迟时间设定中的作用和意义。材料和方法:随机选取患者326例分三组进行比较,第一组87例采取经验值设定延迟时间;第二组109例运用智能跟踪技术启动扫描;第三组130例采取TestBolus技术,根据测得目标血管的时间-密度曲线设定延迟时间。结果:第一组图像质量优22例、良38例、差27例;第二组图像质量优62例、良44例、差3例;第三组图像质量优120例、良8例、差2例;TestBolus技术组图像质量明显优于经验值组,有显著差异(P<0.05);而与智能组,腹主A组无显著差异(P>0.05),优于其余各组(P<0.05)。结论:用Test团注测试扫描技术设定延迟时间能得到优质的CTA原始图像,有利于多层螺旋CT取得更好的三维血管重建图像。 Objective: To explore the role and significance of bolus technique in setting the optimal delay time for multi-slice spiral CT angiography (MSCTA). MATERIALS AND METHODS: A total of 326 patients were randomly divided into three groups for comparison. The first group of 87 patients took the empirical value to set the delay time. The second group of 109 patients started the scan with the intelligent tracking technology. The third group of 130 patients took TestBolus technology. The measured time-density curve of the target vessel sets the delay time. Results: The first group had excellent image quality in 22 cases, good in 38 cases and poor in 27 cases. The second group had excellent image quality in 62 cases, good in 44 cases and poor in 3 cases. The third group had excellent image quality in 120 cases and good in 8 (P <0.05). Compared with the intelligence group and abdominal aphroditus group, there was no significant difference (P> 0.05), which was better than the others Group (P <0.05). CONCLUSIONS: Using the CTGT test scan technique to set the delay time yields a good CTA original image, which is good for multi-slice spiral CT to obtain better 3D reconstruction images.