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Table 2 Thoracic wall target volume

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

 

TomoHelical

TomoDirect

p- value

  

(Mean ± standard deviation)

 

Patient number

9 (Tangential: 6, 3 ports: 3)

 

PTV* (cc)

365 ± 319

 

Modulation factor

1.8 - 2.0

 

Pitch

0.25 - 0.287

 

Field width

2.5 - 5.02

 

Conformity index

2.21 ± 0.14

4.63 ± 0.61

0.004

Uniformity index

1.07 ± 0.04

1.06 ± 0.02

0.93

D95%

96 ± 1

97 ± 1

0.04

Time (sec)

259 ± 39

271 ± 34

0.72

Lung

MLD†(Gy)

6 ± 1

3 ± 1

0.05

 

V5 Gy (%)

44 ± 8

19 ± 6

0.02

 

V10 Gy (%)

22 ± 5

12 ± 4

0.38

 

V20 Gy (%)

6 ± 1

6 ± 2

0.85

 

V30 Gy (%)

2 ± 1

3 ± 1

0.65

Cord (maximum dose)

12 ± 3

7 ± 8

0.11

  1. *PTV, planning target volume.
  2. †MLD, mean lung dose.