Dual energy CT iodine image, indicating the placement of the ROIs.The 5 mm thick slice of a DECT iodine image in portal venous phase image at the level of the coeliac axis shows five ROIs, all with an approximate area of 1.5 cm2. Two ROIs (green) are placed in the right hepatic lobe in segments 4b and 7, one ROI (yellow) in the left hepatic lobe in segment 3, one ROI (blue) in the portal vein, and one in the aorta (red).