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Table 1 Volumes of the CTVs and lungs for the five patients and minimum and maximum diameter of the CTVs as well as depths in lung of the CTVs for each beam direction. The depth of the CTV corresponds to the path length through lung tissue for the spot at the isocenter

From: Effects of the Bragg peak degradation due to lung tissue in proton therapy of lung cancer patients

Patient

Lung volume in cm3

Volume of CTV in cm3

min./max. diameter of CTV in cm

Depth of CTV in cm for different beam directions

270°

315°

1

2294

46.4

2.9/4.2

6.2

3.3

3.6

2

1882

4.2

1.8/2.3

1.8

2.1

1.5

3

1705

32.1

3.5/5.2

12.2

9.2

9.2

4

1780

6.2

2.2/2.4

6.9

2.7

5.3

5

1600

2.7

1.6/2.0

4.5

3.8

3.6