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Table 3 Descriptive analysis of the studied cases according to mean objective image quality and subjective image quality

From: Reduced dose iterative reconstruction versus standard dose filtered back projection in detection of bladder tumors

  Weight ≤ 80 kg (n = 10) Weight > 80 kg (n = 11) P value for A1 vs. B1 P value for
A2 vs. B2
Standard dose Protocol A1 80 kVp
Protocol B1
Standard dose Protocol A2 110 kVp Protocol B2
Objective image quality Mean SNR Aorta
Min–max. 2.38–7.30 1.45–5.66 1.78–8.71 2.14–9.39 (0.007*) (0.082)
Mean ± SD 5.10 ± 1.64 3.48 ± 1.56 5.24 ± 2.17 5.14 ± 2.24
Psoas Ms
Min.–max. 2.07–4.56 1.51–3.02 1.21–9.71 1.39–4.08 (0.006*) (0.82)
Mean ± SD 3.72 ± 0.84 2.23 ± 0.49 3.75 ± 2.32 2.94 ± 0.86
Mean CNR Aorta
Min.–max. 8.42–22.72 6.64–18.63 5.64–20.29 9.1–29.35 (0.085) (0.29)
Mean ± SD 13.94 ± 4.55 10.24 ± 3.75 13.39 ± 4.09 15.50 ± 6.9
Psoas Ms
Min.–max. 7.15–17.96 5.47–16.39 4.98–21.63 7.88–23.42 (0.42) (0.34)
Mean ± SD 12.03 ± 3.55 8.25 ± 2.16 12.02 ± 4.53 13.04 ± 5.07
Subjective image quality Image noise 3(1–3) 2(1–3) 3(2–3) 3(2–3) (0.001*) 1
Image quality 3(1–3) 2(1–3) 3(2–3) 3(2–3) (0.001*) (0.546)
  1. P values for Wilcoxon signed ranks test for comparing between standard FBP and low dose with IR
  2. *Statistically significant at P ≤ 0.05