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Mean objective measurements of CNR and mean qualitative image scoresa
kVmAsCTDIwCNRImage Quality Score
15 mg I/mL20 mg I/mL15 mg I/mL20 mg I/mL
OriginalQ08OriginalQ08OriginalQ08OriginalQ08
10015023.99.2 ± 0.611.6 ± 1.011.8 ± 0.916.1 ± 2.52.00 ± 0.72.58 ± 0.82.25 ± 0.82.92 ± 0.8
20031.810.9 ± 1.714.3 ± 2.8b13.8 ± 2.219.2 ± 3.62.17 ± 0.72.50 ± 1.03.17 ± 0.83.58 ± 0.7b
25039.812.0 ± 2.116.1 ± 2.6b16.0 ± 1.021.8 ± 1.4b2.58 ± 0.73.00 ± 0.4b3.42 ± 0.53.92 ± 0.7b
12010024.08.7 ± 1.411.3 ± 0.711.3 ± 1.114.9 ± 1.61.83 ± 0.72.40 ± 0.52.17 ± 0.92.42 ± 1.0
15036.010.2 ± 1.014.2 ± 1.4b14.8 ± 1.221.8 ± 1.8b2.33 ± 0.82.75 ± 0.62.83 ± 0.73.50 ± 0.5b
20048.011.5 ± 2.0c18.4 ± 2.3b17.3 ± 1.7c22.7 ± 2.3b2.50 ± 1.1c3.08 ± 0.8b3.12 ± 0.7c3.83 ± 0.8b
13510030.79.80 ± 1.613.3 ± 0.912.3 ± 1.916.5 ± 1.61.67 ± 0.72.00 ± 0.72.58 ± 1.03.00 ± 1.0
  • 


    a Data are the mean ± SD.
    

  • 


    b CTA with QDS were significantly superior to the standard CTA (120 kVp and 200 mAs) with a P value < .05 (Wilcoxon signed rank test).
    

  • 


    c Standard CTA.