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Table 5 Mean visual scores for image contrast, image noise and overall image quality

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
    Score Score
  Phase   140 kVp 65 keV 50 keV 140 kVp 65 keV 50 keV
Image contrast Early arterial Reader 1 3.1 ± 0.3 3.4 ± 0.4 3.9 ± 0.2* 3.2 ± 0.4 3.4 ± 0.4 3.9 ± 0.2*
   Reader 2 3.3 ± 0.4 3.5 ± 0.5 3.8 ± 0.3* 3.4 ± 0.5 3.5 ± 0.5 3.8 ± 0.3*
  Late arterial Reader 1 3.3 ± 0.4 3.8 ± 0.3 3.9 ± 0.2 3.5 ± 0.5 3.9 ± 0.1 4.0 ± 0.0
   Reader 2 3.2 ± 0.5 3.8 ± 0.3 3.9 ± 0.2 3.5 ± 0.5 3.9 ± 0.2 4.0 ± 0.0
  Portal venous Reader 1 3.4 ± 0.5 3.8 ± 0.3 3.9 ± 0.1 3.4 ± 0.5 3.9 ± 0.1 3.9 ± 0.2
   Reader 2 3.3 ± 0.5 3.8 ± 0.3 4.0 ± 0.0 3.4 ± 0.4 3.8 ± 0.3 3.9 ± 0.1
Image noise Early arterial Reader 1 3.7 ± 0.4 3.5 ± 0.4 2.9 ± 0.5* 3.7 ± 0.4 3.4 ± 0.5 2.9 ± 0.4*
   Reader 2 3.9 ± 0.2 3.8 ± 0.7 3.3 ± 0.6* 3.9 ± 0.2 3.6 ± 0.5 3.3 ± 0.7
  Late arterial Reader 1 3.5 ± 0.5 3.2 ± 0.6 2.7 ± 0.7* 3.6 ± 0.4 3.1 ± 0.7 2.8 ± 0.6
   Reader 2 4.0 ± 0.0 3.7 ± 0.8 3.4 ± 0.8 3.9 ± 0.2 3.8 ± 0.7 3.2 ± 0.9
  Portal venous Reader 1 3.4 ± 0.5 3.3 ± 0.6 3.2 ± 0.6 3.7 ± 0.4 3.3 ± 0.5 3.2 ± 0.4
   Reader 2 3.9 ± 0.2 3.6 ± 0.4 3.5 ± 0.5 4.0 ± 0.0 3.7 ± 0.4 3.5 ± 0.5
Overall image quality Early arterial Reader 1 3.7 ± 0.4 3.4 ± 0.4 3.0 ± 0.3* 3.6 ± 0.4 3.5 ± 0.5 2.9 ± 0.3*
   Reader 2 3.4 ± 0.5 3.5 ± 0.4 3.2 ± 0.6 3.5 ± 0.5 3.2 ± 0.8 3.2 ± 0.8
  Late arterial Reader 1 3.2 ± 0.4 3.2 ± 0.6 2.9 ± 0.6* 3.5 ± 0.5 3.2 ± 0.6 2.9 ± 0.6*
   Reader 2 3.2 ± 0.5 3.6 ± 0.8 3.2 ± 0.6 3.5 ± 0.5 3.7 ± 0.7 3.2 ± 0.9
  Portal venous Reader 1 3.5 ± 0.5 3.5 ± 0.5 3.4 ± 0.5 3.7 ± 0.4 3.5 ± 0.5 3.4 ± 0.5
   Reader 2 3.3 ± 0.4 3.5 ± 0.5 3.5 ± 0.5 3.5 ± 0.5 3.7 ± 0.4 3.5 ± 0.5
  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.