Table 3 Image quantitative analysis, radiation dose and the positive rate for detecting PE in the groups (A, double low group; B, contrast group).

From: Use of pulmonary CT angiography with low tube voltage and low-iodine-concentration contrast agent to diagnose pulmonary embolism

 

Mean CT value

Noise

SNR

CNR

ED

Diagnosis

Positive

Negative

Group A

419.5 ± 121.9

18.0 ± 3.9

24.5 ± 9.4

20.3 ± 8.9

2.0 ± 0.9

55

137

Group B

342.3 ± 98.6

12.3 ± 2.4

29.1 ± 10.8

23.6 ± 10.2

5.5 ± 0.8

64

126

P value

0.000

0.000

0.000

0.001

0.000

0.320

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