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Table 7 The DC and SP of SNs under different conditions

From: Effects of tube voltage, radiation dose and adaptive statistical iterative reconstruction strength level on the detection and characterization of pulmonary nodules in ultra-low-dose chest CT

SNs

 

kV

30%ASiR-V

50%ASiR-V

70%ASiR-V

FBP

P

mean

DC/%

Dose-1

70

12.11

11.61

10.72

7.45

> 0.05

10.48

  

100

7.40

7.04

7.21

5.64

> 0.05

6.8

 

P

 

0.010

0.008

0.032

> 0.05

  
 

Dose-2

70

7.48

7.79

7.24

4.86

> 0.05

6.84

  

100

6.38

5.59

6.55

5.64

> 0.05

6.03

 

P

 

> 0.05

> 0.05

> 0.05

> 0.05

  
 

Dose-3

70

5.03

5.34

3.82

3.91

> 0.05

4.52

  

100

4.99

4.23

4.08

4.23

> 0.05

4.38

 

P

 

0.001

> 0.05

> 0.05

> 0.05

  

SNs

 

kV

30%ASiR-V

50%ASiR-V

70%ASiR-V

FBP

P

mean

SP/%

Dose-1

70

3.85

3.89

4.11

3.38

> 0.05

3.81

  

100

1.91

1.90

1.80

2.10

> 0.05

1.93

 

P

 

0.008

0.004

0.003

> 0.05

  
 

Dose-2

70

2.28

2.43

2.18

1.97

> 0.05

2.21

  

100

2.72

2.71

2.11

2.53

> 0.05

2.52

 

P

 

> 0.05

> 0.05

> 0.05

> 0.05

  
 

Dose-3

70

3.52

3.79

2.81

3.71

> 0.05

3.48

  

100

1.99

1.39

1.74

1.72

> 0.05

1.71

 

P

 

> 0.05

0.01

> 0.05

0.008

  
  1. PS: SP: size measurement deviation percentage; DC: deformation coefficient; GGNs: Ground glass nodules; SNs: Solid nodules