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Table 3 Results of objective image quality analysis

From: Optimization of contrast medium volume for abdominal CT in oncologic patients: prospective comparison between fixed and lean body weight-adapted dosing protocols

Parameter Fixed dose protocol (n = 50) LBW protocol (n = 50) p value
Arterial phase
 Liver SNR 5.91 ± 1.88 5.58 ± 1.63 0.346
 Liver CNR 1.72 ± 1.31 1.99 ± 1.27 0.123
 Liver CEI, HU 16.10 ± 9.65 23.02 ± 10.84 < 0.001
 Pancreas SNR 5.59 ± 3.55 5.90 ± 2.37 0.130
 Pancreas CNR 2.92 ± 1.76 3.85 ± 2.04 0.004
 Pancreas CEI, HU 50.66 ± 17.29 66.45 ± 19.78 < 0.001
 Kidney SNR 7.38 ± 4.17 8.19 ± 2.61 0.016
 Kidney CNR 7.90 ± 4.10 9.60 ± 3.55 0.003
 Kidney CEI, HU 122.17 ± 35.68 145.00 ± 42.53 0.002
 Aorta SNR 16.07 ± 5.75 14.56 ± 4.89 0.147
 Aorta CNR 16.57 ± 6.42 17.47 ± 5.86 0.379
Portal venous phase
 Liver SNR 8.10 ± 1.96 8.22 ± 2.13 0.766
 Liver CNR 4.48 ± 1.70 4.37 ± 1.61 0.730
 Liver CEI, HU 59.61 ± 15.21 59.22 ± 11.14 0.796
 Pancreas SNR 5.78 ± 2.37 4.91 ± 1.75 0.079
 Pancreas CNR 2.69 ± 1.66 2.13 ± 1.30 0.065
 Pancreas CEI, HU 55.15 ± 20.42 50.64 ± 13.86 0.220
 Kidney SNR 9.54 ± 2.58 10.05 ± 3.10 0.370
 Kidney CNR 9.95 ± 3.56 9.18 ± 2.21 0.198
 Kidney CEI, HU 78.97 ± 58.75 103.56 ± 30.35 < 0.001
 Portal vein SNR 10.42 ± 3.01 9.33 ± 3.37 0.015
 Portal vein CNR 8.92 ± 3.31 7.57 ± 2.31 0.020
  1. Data are means ± standard deviations
  2. LBW lean body weight, SNR signal-to-noise ratio, CNR contrast-to-noise ratio, CEI contrast enhancement index, HU hounsfield unit