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Insights into Imaging

Table 3 Quantitative values of esophageal cancer for SNR and CNR in the arterial and venous phases

From: Evaluation of optimal monoenergetic images acquired by dual-energy CT in the diagnosis of T staging of thoracic esophageal cancer

 

PEI

MEI (+) 40 keV

MEI (+) 50 keV

MEI (+) 60 keV

MEI (+) 70 keV

MEI (+) 80 keV

p

Arterial phase

SNR

8.10 ± 1.49

12.48 ± 3.02

12.96 ± 2.92

12.73 ± 2.75

12.26 ± 2.76

11.61 ± 2.87

0.01*

CNR

2.69 ± 1.51

6.53 ± 3.04

6.05 ± 2.87

5.43 ± 2.65

4.79 ± 2.59

4.21 ± 2.54

0.01*

Venous phase

SNR

9.56 ± 1.91

17.14 ± 4.21

16.90 ± 4.19

16.11 ± 4.16

15.28 ± 4.26

14.14 ± 4.23

0.01*

CNR

2.91 ± 1.95

8.54 ± 3.82

7.71 ± 3.59

6.56 ± 3.42

5.63 ± 3.38

4.74 ± 3.34

0.01*

  1. p < 0.05 indicate statistically significant. *The nonparametric with Kruskal–Wallis H test for non-normally distributed data
  2. ANOVA Analysis of variance, CNR Contrast-to-noise ratio, keV Kiloelectron volt, MEI (+) Noise-optimized virtual monoenergetic images, PEI Polyenergetic images, SNR Signal contrast-to-noise ratio, Esophageal cancer (EC)
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