Fig. 4From: Dual-energy CT with virtual monoenergetic images and iodine maps improves tumor conspicuity in patients with pancreatic ductal adenocarcinomaTransverse contrast-enhanced images of a 62-year-old man with hypoattenuating pancreatic ductal adenocarcinoma (PDAC) at the uncinate process of the pancreas (thick arrows) after bile duct stenting. The tumor conspicuity, margin delineation, and depiction of gastroduodenal artery (thin arrows) were best in the MEI (+) at 40 keV (a), followed by 50–80 keV (b–e), and were better than those in PEI (f). On iodine maps, the iodine concentrations quantified in the tumor (g) and pancreatic parenchyma (h) were normalized to the aorta (blue circle) as normalized iodine concentration (NIC). The NICtumor value of 0.9 mg/mL was significantly lower than the NICparenchyma value of 2.1 mg/mLBack to article page