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Table 2 PTV dose parameters of IMRT and VMAT

From: A dosimetric and radiobiological evaluation of VMAT following mastectomy for patients with left-sided breast cancer

 

Parameters

IMRT

VMAT

P-value

PTV1

V95% (%)

99.0 ± 0.5

99.3 ± 0.3

0.001

 

V100% (%)

94.5 ± 1.6

95.9 ± 1.2

 < 0.001

 

V107% (%)

22.1 ± 7.9

20.9 ± 8.2

0.548

 

V110% (%)

0.3 ± 0.2

0.2 ± 0.1

0.018

 

D2% (Gy)

54.5 ± 0.3

54.3 ± 0.2

0.011

 

D98% (Gy)

48.3 ± 0.6

48.7 ± 0.3

0.003

 

Dmean (Gy)

52.4 ± 0.2

52.6 ± 0.2

0.014

 

HI

0.12 ± 0.02

0.11 ± 0.01

0.001

PTV2

V95% (%)

99.9 ± 0.1

99.9 ± 0.1

0.374

 

V100% (%)

98.8 ± 0.6

99.0 ± 0.6

0.173

 

V107% (%)

13.6 ± 7.3

15.5 ± 9.8

0.264

 

V110% (%)

0.1 ± 0.1

0.1 ± 0.1

0.638

 

D2% (Gy)

54.1 ± 0.4

54.0 ± 0.4

0.233

 

D98% (Gy)

50.2 ± 0.3

50.3 ± 0.4

0.207

 

Dmean (Gy)

52.5 ± 0.3

52.6 ± 0.4

0.055

 

HI

0.08 ± 0.01

0.07 ± 0.01

0.075

PTV

CI

1.17 ± 0.05

1.10 ± 0.03

 < 0.001

 

CN

0.78 ± 0.04

0.84 ± 0.02

 < 0.001