الفهرس 
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Abstract
Dual-phase helical CT provides acquisition of two sets of images during the peak pancreatic enhancement and peak hepatic enhancement. Our study comprised 30 patients, 19 males and 11 females with cancer pancreas (24 patients of adenocarcinoma, 2 patients of mucoid adenocarcinoma and one patients of adenosquamous carcinoma). All our patients were examined by Dual-phase helical CT. The 1st acquisition was taken in the late arterial phase (40sec after initiation of CM injection) and it was found that it is the best phase optimizing the differentiation among the tumor, normal pancreatic tissue and surrounding blood vessels. While the 2nd acquisition was taken in the portal phase (70sec after initiation of CM injection) and it was the phase for peak hepatic enhancement and the best phase for detection of liver metastasis. Dual-phase helical CT has a high sensitivity in detection of irresectability and peripancreatic vascular invasion. But it has low sensitivity in detection of small metastatic liver nodules (< 1cm). Nodal staging with helical CT is inaccurate due to early metastatic involvement in normal-sized lymph nodes. In conclusion: Dual-phase helical CT with initial scanning during the late arterial phase and the 2nd scanning in the portal phase, improved prediction of resectability in patients with pancreatic cancer. The main reason for this improvement is the increased detection of peripancreatic vascular invasion that results from the high vascular enhancement.