Table 3 The results of image noise and attenuation among different image protocols.

From: Image quality and radiation dose of reduced-dose abdominopelvic computed tomography (CT) with silver filter and deep learning reconstruction

 

Standard dose with IR

SilverBeam with DLR

SilverBeam with DLR + CE-boost

P value

P1 vs. P2

P1 vs. P3

P2 vs. P3

Image noise (HU)

Mean

10.59 ± 1.75

10.60 ± 1.08

7.40 ± 1.29

0.001

0.99

0.001

0.001

  BMI ≥ 25

10.42 ± 1.70

10.28 ± 1.12

7.30 ± 1.48

 

0.92

0.001

0.001

  BMI 24.9–20

10.73 ± 1.89

10.63 ± 0.99

7.54 ± 1.24

 

0.94

0.001

0.001

  BMI < 20

10.46 ± 1.31

11.17 ± 1.13

7.09 ± 0.96

 

0.34

0.001

0.001

CT attenuation (HU)

Liver (mean)

119.4 ± 18.46

92.26 ± 11.30

110.11 ± 14.11

0.001

0.99

0.001

0.001

  BMI ≥ 25

107.16 ± 15.90

86.59 ± 7.56

103.59 ± 10.21

 

0.92

0.001

0.001

  BMI 24.9–20

128.84 ± 16.95

93.07 ± 11.88

110.73 ± 14.55

 

0.94

0.001

0.001

  BMI < 20

130.64 ± 13.09

103.59 ± 7.21

124.49 ± 9.34

 

0.34

0.001

0.001

Pancreas (mean)

106.5 ± 17.88

87.12 ± 13.25

108.2 ± 17.16

0.001

0.001

0.76

0.001

  BMI ≥ 25

99.58 ± 16.30

84.10 ± 9.80

103.68 ± 14.30

 

0.001

0.541

0.001

  BMI 24.9–20

109.30 ± 18.02

88.32 ± 14.81

110.45 ± 18.49

 

0.001

0.949

0.001

  BMI < 20

114.08 ± 16.47

90.12 ± 13.90

111.01 ± 17.33

 

0.002

0.896

0.01

Spleen (mean)

135.6 ± 22.29

113.80 ± 15.86

143.90 ± 20.84

0.001

0.001

0.01

0.001

  BMI ≥ 25

130.83 ± 21.54

109.56 ± 13.21

139.04 ± 18.68

 

0.001

0.246

0.001

  BMI 24.9–20

137.97 ± 22.98

116.57 ± 17.29

147 ± 21.47

 

0.001

0.123

0.001

  BMI < 20

138.81 ± 21.10

113.45 ± 14.80

143.69 ± 22.83

 

0.007

0.851

0.003

Abdominal aorta (mean)

187.90 ± 29.66

138.0 ± 32.33

191.0 ± 45.69

0.001

0.001

0.84

0.001

  BMI ≥ 25

179.49 ± 30.11

133.79 ± 29.68

184.72 ± 40.15

 

0.001

0.829

0.001

  BMI 24.9–20

192.03 ± 28.77

143.26 ± 35.65

198.33 ± 51.43

 

0.001

0.741

0.001

  BMI < 20

194.47 ± 29.12

127.92 ± 20.95

178.02 ± 29.16

 

0.001

0.366

0.001

Paraspinal muscle (mean)

60.11 ± 9.65

59.44 ± 8.04

62.08 ± 8.47

0.11

0.11

0.87

0.28

  BMI ≥ 25

58.04 ± 10.39

56.90 ± 9.53

59.61 ± 9.96

 

0.893

0.814

0.522

  BMI 24.9–20

61.06 ± 8.67

59.86 ± 6.97

62.48 ± 7.39

 

0.740

0.668

0.180

  BMI < 20

61.85 ± 11.10

64.31 ± 5.34

66.83 ± 6.31

 

0.772

0.387

0.551

  1. Data are reported as mean ± standard deviation. BMI body mass index; IR iterative reconstruction; DLR deep learning reconstruction; CTDIvol CT dose index volume; DLP dose length product; ED effective dose; HU Hounsfield unit.
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