CT numbers (HU) of ROIs in the images of test dataset.

CE DECT (denoted as (A)), VNC DECT (denoted as (B)), and VNC-Net (denoted as (C)) were analyzed. Numbers in parentheses are standard deviations. Statistical significance (p-value < 0.05) was assessed by Wilcoxon signed rank test. CE DECT, contrast enhanced dual-energy computed tomography; CT, computed tomography; HU, Hounsfield unit; ROI, region of interest; VNC DECT, virtual non-contrast dual-energy computed tomography.