目的　研究多层螺旋CT动脉期、胰腺期和肝脏期三期增强扫描在胰腺癌诊断的作用。方法　 2 5例经证实的胰腺癌患者行三期增强扫描 ,扫描延迟时间分别为 2 0s ,3 8s和 75s ,注射造影剂速率为 3ml s,观察并比较正常胰腺和肿瘤在三期的增强情况。结果　肿瘤 -正常胰腺密度差胰腺期 (67.2± 2 9.5)较另外两期有显著性差异 (Ρ <0 .0 1) ,肝脏期 (40 .2± 2 5.1)较动脉期 (2 4.5±17.3 )也有显著性差异 (Ρ <0 .0 5)。结论　联合应用胰腺期和肝脏期的扫描方案在胰腺癌诊断中具有重要价值 Objective To study the role of multi-slice spiral CT in the diagnosis of pancreatic adenocarcinoma of the arterial, pancreatic and hepatic phases. Methods Twenty-five confirmed pancreatic cancer patients underwent three-phase contrast-enhanced scanning with scan delay of 20s, 38s and 75s, respectively, and the contrast agent injection rate was 3mls. The enhancement of the normal pancreas and tumor in the third phase was observed and compared . Results The difference of tumor-normal pancreatic tissue between the two groups was significantly different from that of the other two groups (P <0.01), that of the hepatic phase (40.2 ± 2.1.1) and the arterial phase (24.5 ± 17.3) ) Also had significant difference (P <0.05). Conclusion The combined application of the pancreatic and hepatic stages of the scan program is of great value in the diagnosis of pancreatic cancer