Enhancement parameters of contrast-enhanced computed tomography for pancreatic ductal adenocarcinoma: Correlation with pathologic grading

Figure 1 Axial computed tomography images on arterial phase (A) and pancreatic phase (B) of a 68-year-old woman, who was classified in the poorly differentiated group. A: Computed tomography (CT) attenuation values [Hounsfield Unit (HU)] of the tumor in the arterial phase (VT_arterial ) and the aorta in the arterial phase (VA_arterial) were measured by drawing two separate circular regions of interest in the aorta and pancreas on arterial phase image; B: CT HU of the tumor in a pancreatic phase (VT_pancreatic) and the aorta in the pancreatic phase (VA_pancreatic) were measured in the aorta and pancreas on the pancreatic phase 65 s after the injection of the contrast agent.