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Table 5: 

Qualitative assessment of regular-dose and reduced-dose clinical CT datasets with variable ASIR blending using the 5-point grading system


Radiation DoseReconstruction TechniqueNoiseScatter-Related ArtifactsGM-WM DifferentiationVisibility of Small StructuresImage Sharpness
Regular dose (175 mAs)100% FBP2.80 ± 0.092.70 ± 0.102.82 ± 0.12a2.85 ± 0.083.00 ± 0.26
Lower dose (140 mAs)100% FBP2.10 ± 0.06a2.85 ± 0.102.09 ± 0.112.82 ± 0.093.09 ± 0.25
30% ASIR + 70% FBP2.90 ± 0.103.00 ± 0.072.90 ± 0.113.00 ± 0.003.19 ± 0.24
60% ASIR + 40% FBP3.70 ± 0.12a3.55 ± 0.11a3.61 ± 0.12a3.05 ± 0.053.28 ± 0.30
100% ASIR4.25 ± 0.12a3.70 ± 0.14a4.00 ± 0.15a3.00 ± 0.123.00 ± 0.39
  • 


    ↵a Qualitative assessment: mean scores ± standard error.