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Table 4 Ratios of increase in CNR on each VM image compared to 65-keV VM image with 300-mgI/ml concentration contrast material as baseline CNR

From: Effects of High-concentration contrast material and low-voltage CT on contrast for multiphasic CT of the upper abdomen: comparison using the simulation with virtual monochromatic imaging obtained by fast-switch kVp dual-energy CT

   Group A Group B  
  Phase 50 keV 65 keV 50 keV
Aorta Early arterial 1.11 1.21 1.34
  Late arterial 1.13 0.81 0.93
  Portal venous 1.23 1.01 1.20
Portal vein Early arterial 1.37 1.41 1.77
  Late arterial 1.16 0.99 1.15
  Portal venous 1.16 1.02 1.20
Hepatic Early arterial 1.01 1.26 1.14
Parenchyma Late arterial 1.07 0.94 1.02
  Portal venous 1.08 0.91 1.02