Image reconstruction
Spectral base image (SBI) datasets were reconstructed, with a spectral level of three, a slice thickness of one mm, a slice increment of one mm, standard kernel (B) with a window width of 400 HU & a level of 40 HU, and sharp kernel (YB) with a window width of −1400 HU & a level of −600 HU.All arterial phase images were transferred to the dedicated workstation (IntelliSpace V9, Philips Healthcare) for further analysis. Both conventional images (CI) and virtual mono-energetic images at 40 keV (VMI