Skip to main content

Table 3 Overlapping volumes of OARs with the PTV and the extended regions

From: Volumetric and dosimetric comparison of organs at risk between the prone and supine positions in postoperative radiotherapy for prostate cancer

 

Prone

 

Supine

  
 

mean (cc)

SD (cc)

mean (cc)

SD (cc)

P valuea

Small intestine

 PTV

1.5

5.5

7.9

15.7

0.036

 PTV + 0.5 cm

2.6

8.9

12.1

22.6

0.035

 PTV + 1 cm

3.5

11.4

17.1

29.8

0.035

 PTV + 2 cm

5.6

14.5

26.8

46.9

0.035

 PTV + 3 cm

9.0

17.4

36.5

63.2

0.021

 PTV + 4 cm

16.5

22.6

48.8

77.3

0.16

Rectum

 PTV

10.9

4.2

12.4

4.4

0.064

 PTV + 0.5 cm

25.2

7.4

29.2

8.0

0.0093

 PTV + 1 cm

38.6

10.6

44.7

11.1

0.0056

 PTV + 2 cm

60.3

17.2

67.4

20.4

0.064

 PTV + 3 cm

71.2

21.4

76.5

27.6

0.38

 PTV + 4 cm

74.5

22.3

80.1

32.1

0.61

Bilateral femursb

 PTV

0.0

0.0

0.0

0.0

 

 PTV + 0.5 cm

0.1

0.3

0.1

0.2

0.34

 PTV + 1 cm

1.6

1.9

1.1

1.6

0.12

 PTV + 2 cm

14.5

9.1

11.9

8.7

0.0093

 PTV + 3 cm

42.4

14.8

37.5

15.3

0.0021

 PTV + 4 cm

77.0

16.3

71.2

17.8

0.0039

Bladder

 PTV

62.7

18.7

78.4

22.4

0.0021

 PTV + 0.5 cm

87.9

24.0

102.9

25.3

0.0032

 PTV + 1 cm

110.2

30.2

122.8

28.2

0.0032

 PTV + 2 cm

147.7

45.3

153.2

40.1

0.017

 PTV + 3 cm

176.5

62.2

174.8

56.5

0.064

 PTV + 4 cm

197.3

78.9

190.1

72.8

0.089

Sigmoid colon

 PTV

1.5

2.0

2.6

4.3

0.12

 PTV + 0.5 cm

4.1

5.4

5.9

8.5

0.26

 PTV + 1 cm

7.1

8.9

9.6

12.6

0.12

 PTV + 2 cm

16.1

15.7

20.2

19.6

0.27

 PTV + 3 cm

28.6

20.6

33.4

24.1

0.59

 PTV + 4 cm

42.9

25.1

45.6

28.5

0.71

  1. Abbreviation, OARs organs at risk, PTV planning target volume, SD standard deviation
  2. aby Wilcoxon signed-rank test
  3. bThe total volume of the bilateral femurs
  4. P < 0.05