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Table 2 Dosimetric results for PTV1 (49.5 Gy) and PTV2 (59.4 Gy)

From: Plan comparison of volumetric-modulated arc therapy (RapidArc) and conventional intensity-modulated radiation therapy (IMRT) in anal canal cancer

 

PLANS

IMRT

RA1

RA2

PTV1

D98%, Gy (%)

47.1 ± 0.8 (95.2)

46.6 ± 1.2 (94.2)

46.3 ± 0.9 (93.7)

 

D95%, Gy (%)

47.7 ± 0.8 (96.4)

47.8 ± 1.2 (96.6)

47.4 ± 0.8 (95.8)

 

D2%, Gy (%)

59.8 ± 0.7 (120)

61.6 ± 1.6 (124)a,b

60.1 ± 1.3 (121)

 

HI, Gy (D5%-D95%)

11.2 ± 0.6

12.8 ± 1.1a

15 ± 1.4

 

CI

1.2 ± 0.1

1.2 ± 0.1

1.17 ± 0.1

 

Dmean, Gy (%)

52.1 ± 1.5 (105)

53.32 ± 1.7(107)

52.2 ± 1 (105)

PTV2

D98%, Gy (%)

56.8 ± 0.13 (95.6)

57 ± 0.2 (95.9)a,b

56.8 ± 0.1 (95.6)

 

D95%, Gy (%)

57.4 ± 0.3 (96.5)

57.8 ± 0.5 (97.4)a,b

57.4 ± 0.3 (96.5)

 

D2%, Gy (%)

60.6 ± 0.98 (102)

62.7 ± 1.64 (105)a,b

60.8 ± 1.3 (102)

 

HI, Gy (D5%-D95%)

3.0 ± 0.7

4.3 ± 1.3a,b

3.21 ± 1.16

 

CI

1.2 ± 0.21

1.8 ± 0.5a,b

1.15 ± 0.15

 

Dmean, Gy (%)

58.9 ± 0.4 (99.2)

60.3 ± 1.1 (101.6)a

59.2 ± 0.9 (99.7)

  1. a if the difference with IMRT is significant
  2. b if the difference with RA2 is significant for RA1
  3. PTV: Planning Target Volume, Dx%: Dose received by x% of the volume, HI: Homogeneity Index, CI: Conformity Index, D mean: Dose mean