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Table 3 Dose parameters for definite treatment

From: DVH- and NTCP-based dosimetric comparison of different longitudinal margins for VMAT-IMRT of esophageal cancer

Definite treatment (50.4 Gy)

 

PTV2

PTV3

PTV4

  
 

Mean ± SD

Mean ± SD

Mean ± SD

p-Valuea

p-Valueb

Myelon

 Dmax (Gy)

36.49 ± 3.09

37.21 ± 3.04

37.77 ± 3.05

0.146

0.130

Liver

 Dmean (Gy)

0.61 ± 1.24

0.85 ± 1.62

1.16 ± 1.88

0.017

0.032

 Dmedian (Gy)

0.22 ± 0.25

0.34 ± 0.48

0.59 ± 1.04

0.196

0.179

Heart

 Dmin (Gy)

1.10 ± 2.76

1.18 ± 2.68

1.25 ± 2.39

0.557

0.384

 Dmax (Gy)

31.48 ± 23.31

40.93 ± 17.28

50.23 ± 7.33

0.056

0.021

 Dmean (Gy)

7.65 ± 7.41

9.26 ± 7.86

10.73 ± 7.48

0.015

0.003

 Dmedian (Gy)

6.02 ± 6.33

7.36 ± 7.16

7.86 ± 7.14

0.212

0.059

 V5 (%)

37.48 ± 38.56

45.89 ± 40.15

55.13 ± 39.55

<0.001

0.001

 V10 (%)

31.27 ± 35.49

37.71 ± 37.10

45.18 ± 36.98

0.008

0.007

 V15 (%)

19.52 ± 21.85

24.16 ± 24.36

27.50 ± 22.24

0.163

0.020

 V20 (%)

11.76 ± 13.25

14.52 ± 14.79

16.46 ± 13.39

0.181

0.024

 V25 (%)

7.55 ± 8.63

9.34 ± 9.62

10.60 ± 8.71

0.179

0.027

 V30 (%)

5.20 ± 6.02

6.44 ± 6.68

7.37 ± 6.15

0.145

0.026

 V35 (%)

3.78 ± 4.43

4.67 ± 4.89

5.45 ± 4.64

0.089

0.022

 V40 (%)

2.87 ± 3.41

3.52 ± 3.75

4.20 ± 3.67

0.046

0.019

 V45 (%)

2.19 ± 2.68

2.67 ± 2.93

3.23 ± 2.95

0.030

0.018

Lungs

 Dmin (Gy)

0.22 ± 0.15

0.29 ± 0.20

0.39 ± 0.27

0.004

0.002

 Dmax (Gy)

50.79 ± 2.99

51.72 ± 0.40

51.80 ± 0.67

0.711

0.313

 Dmean (Gy)

11.10 ± 2.48

12.39 ± 2.27

13.37 ± 2.27

<0.001

<0.001

 Dmedian (Gy)

8.31 ± 4.86

9.96 ± 4.16

11.65 ± 3.00

0.004

0.001

 V5 (%)

63.61 ± 18.19

70.52 ± 18.49

76.20 ± 18.29

<0.001

<0.001

 V10 (%)

50.67 ± 12.94

57.46 ± 13.30

63.33 ± 14.45

<0.001

<0.001

 V15 (%)

30.32 ± 8.43

35.01 ± 7.59

38.12 ± 7.26

0.001

<0.001

 V20 (%)

15.96 ± 5.76

18.42 ± 5.35

20.04 ± 4.95

0.001

<0.001

 V25 (%)

8.33 ± 3.38

9.62 ± 3.26

10.37 ± 3.11

0.004

<0.001

 V30 (%)

4.65 ± 1.77

5.42 ± 1.75

5.83 ± 1.63

0.008

0.001

 V35 (%)

2.87 ± 0.87

3.38 ± 0.90

3.63 ± 0.83

0.009

0.001

 V40 (%)

1.90 ± 0.56

2.30 ± 0.50

2.47 ± 0.48

0.011

0.011

 V45 (%)

1.23 ± 0.50

1.56 ± 0.30

1.68 ± 0.32

0.027

0.046

  1. a4 cm margin vs. 3 cm margin, b 4 cm margin vs. 2 cm margin, Gy Gray, cm centimeters