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目的：探讨螺旋 ＣＴ双期增强扫描诊断胰腺癌的价值。材料和方法：２７例胰腺癌患者行螺旋 ＣＴ双期增强扫描，动脉期（ＡＰ）延迟２５ｓ，门静脉期（ＰＶＰ）延迟６５ｓ，以３～４ｍｌ／ｓ团注造影剂８０～１００ｍｌ。测量肿瘤和正常胰腺组织的ＣＴ值，计算肿瘤－胰腺密度差，对胰周血管观察评价。结果；肿瘤的平均ＣＴ值ＡＰ和ＰＶＰ是５１±８Ｈｕ、７４±１０Ｈｕ，正常胰腺的 ＣＴ值 ＡＰ和 ＰＶＰ是 １２３±１９Ｈｕ、１００±１０Ｈｕ，肿瘤－胰腺密度差 ＡＰ和 ＰＶＰ是 ７１±２０Ｈｕ、２５±１２Ｈｕ，二者差异明显（Ｐ＜０．０１）。胰周动脉侵犯在ＡＰ显示好，静脉侵犯在ＰＶＰ显示好。结论：ＡＰ可获得最大的肿瘤－胰腺密度差，ＡＰ结合ＰＶＰ对胰周血管侵犯的评价更全面准确。
Objective: To investigate the value of dual-phase helical CT in the diagnosis of pancreatic cancer. MATERIALS AND METHODS: Twenty-seven patients with pancreatic cancer underwent spiral CT double-phase contrast-enhanced scanning. The arterial phase (AP) was delayed 25s and the portal vein phase (PVP) was delayed 65s. Tumor and normal pancreatic tissue was measured CT value, calculate the tumor - pancreatic density difference, peritubular vessel observation evaluation. Results: The average CT value of the tumor was 51 ± 8Hu and 74 ± 10Hu. The AP and PVP values of the normal pancreas were 123 ± 19Hu and 100 ± 10Hu. The tumor-pancreatic density difference AP and PVP were 71 ± 20uu, 25 ± 12Hu, the difference was significant (P <0.01). Pancreatic artery invasion in the AP showed good, venous invasion showed good in the PVP. Conclusion: AP can obtain the largest tumor - pancreatic density difference, AP combined PVP evaluation of peripancreatic vascular invasion is more comprehensive and accurate.