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Table 3 Mean CNRs for the aorta, portal vein and hepatic parenchyma

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

         Intergroup comparison
   Group A Group B Group A vs B
   CNR CNR p  
  Phase 140 kVp 65 keV 50 keV 140 kVp 65 keV 50 keV 65 keV 50 keV
Aorta Early arterial phase 29.5 ± 7.17 46.6 ± 12.7 51.7 ± 13.1* 36.6 ± 9.92 56.6 ± 18.0 62.4 ± 16.7* 0.015 <0.01
  Late arterial phase 29.1 ± 8.66 47.5 ± 14.2 53.7 ± 14.8* 25.3 ± 10.0 38.4 ± 16.8 44.1 ± 16.0* 0.018 0.01
  Portal venous phase 10.6 ± 5.02 16.4 ± 4.22 20.1 ± 5.74* 10.8 ± 3.96 16.6 ± 5.28 19.6 ± 4.74* n.s. n.s.
Portal vein Early arterial phase 2.41 ± 2.78 3.88 ± 3.02 5.31 ± 3.17* 2.48 ± 3.60 5.49 ± 4.29 6.88 ± 4.20* n.s. n.s.
  Late arterial phase 10.3 ± 4.89 19.0 ± 4.73 22.0 ± 4.57* 13.0 ± 5.17 18.9 ± 5.11 21.8 ± 4.77* n.s. n.s.
  Portal venous phase 10.6 ± 2.93 17.8 ± 4.59 20.7 ± 4.38* 11.5 ± 3.51 18.1 ± 5.38 21.4 ± 6.31* n.s. n.s.
Hepatic parenchyma Early arterial phase 1.47 ± 1.29 1.35 ± 1.45 1.36 ± 1.48 1.17 ± 1.87 1.66 ± 1.80 1.55 ± 1.94 n.s. n.s.
  Late arterial phase 3.37 ± 2.05 9.32 ± 3.16 9.94 ± 2.67* 3.70 ± 1.92 8.73 ± 2.61 9.47 ± 2.57* n.s. n.s.
  Portal venous phase 5.69 ± 1.60 8.28 ± 2.46 8.96 ± 2.25* 5.97 ± 1.92 7.56 ± 2.77 8.45 ± 2.83* n.s. n.s.
  1. Data are shown as mean ± standard deviation.
  2. *Differences were statistically significant between 65-keV and 50-keV images (p < 0.05).
  3. n.s.: not significant.