目的 观察胰腺在不同触发点和 触发阈值扫描情况下CT强化程度，探讨获 得最佳胰腺图像质量的触发方式，并比较 胰腺各部位之间是否存在强化程度的差 异。方法 前瞻性选择80例接受上腹部CT 增强检查的患者，将其随机均分成Ⅰ、Ⅱ 两组，分别设定膈顶水平的胸主动脉和 左心房作为触发点感兴趣区(ROI)，再将 每组随机均分为A、B、C、D四个亚组， 分别设置90、120、150、180Hu作为监测 阈值进行追踪触发扫描，比较各组强化 后胰头、体、尾的平均CT值与十二指肠 的CT值之差。结果 ⅠA、ⅠB、ⅠC、ⅠD 亚组胰腺与十二指肠的CT值之差分别为 (23.28±9.52)HU、(35.86±12.50)HU、 (23.50±6.44)HU、(18.40±6.28)HU， ⅠB亚组与Ⅰ组内其余各亚组相比有明显 差异(P均＜0.05)；ⅡA、ⅡB、ⅡC、ⅡD 亚组胰腺与十二指肠的CT值之差分别为 (21.11±5.53)HU、(25.94±6.60)HU、 (34.65±8.52)HU、(26.44±7.13)HU， ⅡC亚组与Ⅱ组内其余各亚组相比有明显 差异(P均＜0.05)；ⅠB与ⅡC相比无明显 差异(P=0.803)；各亚组内胰头、体、 尾的CT值相比均无统计学差异(P均＞ 0.05)。结论 上腹部CT增强检查时，选择 ROI位于胸主动脉、阈值120HU或ROI位于 左心房、阈值150HU的检查方法，能获得 最佳胰腺增强图像质量；胰腺各部位强化 程度无显著差异。

Objective To compare the enhancement degree of pancreas of CT enhancement scanning with different triggering position and threshold, in order to obtain the best image quality, and to compare the difference of enhancement degree in various parts of pancreas. Methods A total of 80 patients who underwent epigastric CT enhancement were prospectively selected and randomly divided into group Ⅰ and Ⅱ, in which thoracic aorta and left atrium were located as the region of interest (ROI) of triggering position. Patients in each group were divided into A, B, C and D subgroups. 90, 120, 150 and 180Hu were taken as the monitoring threshold tracking triggers, respectively. Difference between average CT value of head, body and tail of pancreas and CT value of duodenum were compared. Results The difference of CT value between pancreas and duodenum in subgroup ⅠA, ⅠB, ⅠC and ⅠD was (23.28±9.52)HU, (35.86±12.50)HU, (23.50±6.44)HU and (18.40±6.28)HU, respectively. Significant difference was found between ⅠB and the other subgroups in group Ⅰ(all P<0.05). The difference in subgroup ⅡA, ⅡB, ⅡC and ⅡD was (21.11±5.53)HU, (25.94±6.60)HU, (34.65±8.52)HU and (26.44±7.13)HU, respectively. Significant difference was found between ⅡC and the other subgroups in group Ⅱ(all P<0.05). No significant existed between ⅠB and ⅡC subgroup(P=0.803). No significant diference was found among the CT value of head, body and tail of pancreas in every subgroups(all P>0.05). Conclusion Locating at thoracic aorta as the ROI, and taking 120HU as the monitor threshold or locating at left atrium as the ROI, and taking 150HU as the monitor threshold enables the best pancreatic image quality in epigastric CT enhancement. No significant difference of enhancement degree existed in various parts of pancreas.