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Insights into Imaging

Table 3 Comparison of objective CT image quality between ULD-CT and SD-CT

From: Diagnostic accuracy of ultra-low-dose CT compared to standard-dose CT for identification of non-displaced fractures of the shoulder, knee, ankle, and wrist

Group

Shoulder (n = 24)

Knee (n = 17)

Noise

SNR

CNR

CTc

Noise

SNR

CNR

CTc

SD

48.52 ± 9.20

1.53 ± 0.96

26.32 ± 15.06

1669.88 ± 217.98

70.88 ± 13.19

1.39 ± 0.45

32.80 ± 17.58

2028.50 ± 132.08

ULD

138.42 ± 40.00

0.51 ± 0.23

15.89 ± 6.41

2038.06 ± 287.64

154.13 ± 32.21

0.57 ± 0.11

15.29 ± 2.91

2374.52 ± 260.04

F

115.14

25.79

44.10

24.98

97.68

52.74

16.42

23.97

P

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

Group

Ankle (n = 25)

Wrist (n = 26)

Noise

SNR

CNR

CTc

Noise

SNR

CNR

CTc

SD

41.39 ± 10.03

2.54 ± 0.78

54.39 ± 19.74

2223.96 ± 321.96

41.15 ± 8.42

2.34 ± 0.51

34.49 ± 22.23

2888.46 ± 184.09

ULD

162.49 ± 10.11

0.60 ± 0.05

16.64 ± 2.16

2798.98 ± 365.96

189.89 ± 84.25

0.53 ± 10

15.73 ± 2.87

1926.76 ± 377.23

F

1808.07

161.89

90.37

34.79

80.20

42.73

200.46

136.48

P

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

 < 0.0001

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