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Table 2 Dosimetric parameters comparison for OAR (mean ± standard deviation)

From: VMAT planning study in rectal cancer patients

  

IMRT

SA-VMAT

DA-VMAT

P(IMRT vs SA-VMAT)

P(IMRT vs DA-VMAT)

Small bowel

Dmean (Gy)

12.1 ± 8.0

15.5 ± 7.7

15.3 ± 7.6

0.001

0.002

 

D2% (Gy)

35.7 ± 12.1

40.0 ± 10.2

39.6 ± 10.0

0.005

0.009

 

V15 (cc)

132.0 ± 110.2

185.8 ± 130.0

186.4 ± 128.8

0.004

0.005

 

V30 (cc)

48.8 ± 20.0

77.5 ± 21.0

78.8 ± 21.5

0.001

0.002

Bladder

Dmean (Gy)

39.0 ± 3.3

42.2 ± 4.0

40.0 ± 3.6

0.001

0.074

 

D2% (Gy)

52.9 ± 0.6

53.2 ± 0.7

52.4 ± 0.5

0.132

0.005

 

V30 (cc)

437.1 ± 156.5

479.4 ± 176.5

463.2 ± 191.2

0.061

0.460

 

V40 (cc)

281.9 ± 118.9

366.2 ± 155.8

321.1 ± 167.1

0.002

0.140

 

V50 (cc)

112.0 ± 55.6

185.7 ± 107.4

151.1 ± 115.6

0.001

0.112

Femur heads

Dmean (Gy)

19.9 ± 4.1

23.2 ± 3.4

24.3 ± 2.8

0.025

0.012

 

D10% (Gy)

28.2 ± 5.5

29.6 ± 4.3

31.5 ± 4.1

0.173

0.047

Healthy tissues

V5 (cc)

9454.9 ± 1999.3

9827.4 ± 2153.3

9815.3 ± 2142.0

0.001

0.001

 

V10 (cc)

7833.9 ± 1591.8

8167.6 ± 1789.4

8331.8 ± 1733.7

0.013

0.001

 

V20 (cc)

5224.2 ± 1084.5

4721.8 ± 884.3

4750.7 ± 876.5

0.002

0.005

  1. OAR: organ at risk, IMRT: intensity modulated radiotherapy, SA-VMAT: single-arc volumetric modulated arc therapy, DA-VMAT: double-arc volumetric modulated arc therapy.