Skip to main content

Table 2 Mean attenuation values for the aorta, portal vein, hepatic parenchyma and paraspinal muscle (HU) and image noise

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
   Attenuation (HU) Attenuation (HU)
  Phase 140 kVp 65 keV 50 keV 140 kVp 65 keV 50 keV
Aorta Early arterial 296 ± 42.2 422 ± 65.6 751 ± 119* 355 ± 56.2 511 ± 85.0 907 ± 156*
  Late arterial 302 ± 54.2 441 ± 82.9 787 ± 151* 282 ± 75.6 398 ± 93.7 705 ± 172*
  Portal venous 154 ± 39.0 207 ± 20.3 368 ± 63.2* 158 ± 22.1 219 ± 23.0 375 ± 32.5*
Portal vein Early arterial 77.4 ± 22.2 94.8 ± 23.4 152 ± 39.7* 82.0 ± 23.4 107 ± 30.5 175 ± 53.4*
  Late arterial 146 ± 34.5 206 ± 45.1 353 ± 81.6* 170 ± 36.8 250 ± 50.4 436 ± 91.2*
  Portal venous 154 ± 18.9 219 ± 25.3 378 ± 43.0* 163 ± 19.7 233 ± 23.6 398 ± 47.3*
Hepatic Early arterial 69.7 ± 9.75 74.9 ± 9.09 101 ± 16.8* 69.0 ± 9.25 78.1 ± 10.3 105 ± 18.1*
Parenchyma Late arterial 89.7 ± 16.4 141 ± 16.8 219 ± 26.3* 91.8 ± 13.6 145 ± 13.2 225 ± 22.9*
  Portal venous 113 ± 10.1 141 ± 14.4 221 ± 25.2* 115 ± 10.3 140 ± 15.0 217 ± 24.9*
Paraspinal Early arterial 58.2 ± 4.98 64.5 ± 5.07 84.2 ± 8.18* 57.5 ± 4.67 64.8 ± 7.15 85.3 ± 11.9*
Muscle Late arterial 61.3 ± 7.77 67.9 ± 7.77 89.4 ± 11.1* 68.8 ± 7.10 68.8 ± 7.10 92.0 ± 12.7*
  Portal venous 66.6 ± 6.09 73.9 ± 6.23 101 ± 9.76* 65.0 ± 5.62 74.6 ± 7.25 99.3 ± 18.8*
   Image noise Image noise
Image noise Early arterial 8.27 ± 1.30 8.06 ± 1.81 13.1 ± 1.81* 8.56 ± 1.50 8.42 ± 1.84 13.6 ± 2.03*
  Late arterial 8.52 ± 1.38 8.24 ± 1.64 13.3 ± 2.08* 8.84 ± 1.76 8.91 ± 2.11 13.4 ± 2.23*
  Portal venous 8.57 ± 1.39 8.44 ± 1.57 13.5 ± 1.84* 8.96 ± 1.92 8.61 ± 2.05 13.8 ± 1.91*
  1. Data are shown as mean attenuation ± standard deviation.
  2. *Differences were statistically significant between 65-keV and 50-keV images (p < 0.05).