<prompt> Viual non-contrast CT is obtained inSpiral CTMultidetector CTDual source CTHRCT  <response>: Dual-energy DE CT implies acquiring of data sets simultaneously at two different photon spectra in a single CT acquisition. Using the DE data sets obtained with Iodinated contrast material, an un-enhanced CT image, or Viual non-contrast VNC-CT image of the abdomen can be generated using DE post-processing algorithms. 