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Table 1 Prostate target volume

From: Intensity-modulated radiation therapy using static ports of tomotherapy (TomoDirect): comparison with the TomoHelical mode

 

TomoHelical

TomoDirect

   

Angles A ( p-value )

Angles B ( p-value )

  

(Mean ± standard deviation)

Patient number

19

PTV* (cc)

95.4 ± 22

Modulation factor

2

Pitch

0.215

Field width

2.5

Conformity index

1.95 ± 0.27

2.08 ± 0.37

(0.22)

2.01 ± 0.5

( 0.61)

Uniformity index

1.06 ± 0.04

1.07 ± 0.05

(0.26)

1.06 ± 0.04

(0.4)

D95% (%)

96 ± 3

96 ± 3

(0.99)

96 ± 2

(0.64)

Time (sec)

202 ± 15

221 ± 19

( 0.001 )

215 ± 23

(0.04)

Rectum

V10 Gy (%)

99 ± 2

99 ± 2

(0.51)

98 ± 3

(0.32)

 

V20 Gy (%)

78 ± 15

87 ± 11

(0.035)

81 ± 12

(0.49)

 

V30 Gy (%)

50 ± 4

65 ± 22

(0.005)

60 ± 19

(0.03)

 

V40 Gy (%)

30 ± 4

46 ± 24

(0.008)

42 ± 21

(0.01)

 

V50 Gy (%)

21 ± 3

33 ± 18

(0.008)

34 ± 19

(0.01)

 

V60 Gy (%)

15 ± 2

22 ± 12

(0.006)

25 ± 16

(0.01)

 

V70 Gy (%)

7 ± 2

10 ± 5

(0.01)

14 ± 12

(0.02)

Bladder

V10 Gy (%)

79 ± 18

76 ± 17

(0.62)

80 ± 17

(0.81)

 

V20 Gy (%)

66 ± 18

61 ± 16

(0.39)

63 ± 19

(0.76)

 

V30 Gy (%)

51 ± 14

50 ± 13

(0.89)

51 ± 14

(0.81)

 

V40 Gy (%)

35 ± 9

37 ± 10

(0.5)

38 ± 9

(0.44)

 

V50 Gy (%)

24 ± 6

27 ± 8

(0.23)

28 ± 7

(0.07)

 

V60 Gy (%)

16 ± 4

19 ± 5

(0.1)

20 ± 5

(0.01)

 

V70 Gy (%)

9 ± 2

10 ± 3

(0.28)

12 ± 3

(0.004)

  1. * PTV, planning target volume.
  2. Each TomoDirect plan (angles A and angles B) was compared with TomoHelical plan.