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Table 4 Absolute dose values for the non-modulated case and differences in percent of the mean dose Dmean, D98% and D2% between the modulated and the non-modulated cases for the CTV and the patients 2 to 5. The modulation powers used in these cases are 450 μm and 800 μm

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

Patient

Modulation

Beam direction: 0°

Beam direction: 270°

Beam direction: 315°

Dmean

D98%

D2%

Dmean

D98%

D2%

Dmean

D98%

D2%

2

Dnon-mod in Gy (RBE)

29.9

23.4

32.0

30.1

25.2

31.1

30.0

22.1

32.3

450 μm

−1.8%

−0.7%

−0.2%

− 1.1%

− 0.8%

− 0.7%

−1.1%

− 1.5%

− 0.7%

800 μm

− 3.1%

− 2.9%

− 3.8%

− 1.9%

−1.4%

− 1.1%

− 2.0%

− 2.5%

−1.2%

3

Dnon-mod in Gy (RBE)

30.0

25.8

32.2

30.1

28.3

31.5

30.0

27.0

31.9

450 μm

−1.1%

−1.4%

−0.9%

−0.6%

−2.9%

− 0.5%

− 0.8%

− 2.2%

− 0.8%

800 μm

− 1.8%

−2.8%

−1.5%

− 1.1%

−5.1%

−0.8%

−1.4%

− 4.2%

− 1.1%

4

Dnon-mod in Gy (RBE)

30.0

25.7

31.0

30.0

24.2

32.2

30.0

26.8

30.8

450 μm

−1.3%

−2.5%

−0.8%

−0.6%

−1.2%

− 0.3%

− 0.6%

−1.1%

− 0.4%

800 μm

− 2.2%

−4.2%

− 1.2%

−1.0%

−2.0%

− 0.5%

−1.0%

−2.0%

− 0.7%

5

Dnon-mod in Gy (RBE)

30.1

27.2

32.8

30.0

23.7

31.6

30.1

27.9

33.8

450 μm

−2.6%

−0.5%

−1.1%

−2.0%

−3.0%

− 2.1%

−3.0%

− 1.5%

−3.2%

800 μm

−4.7%

− 2.8%

−2.1%

− 3.1%

− 4.6%

− 3.2%

− 4.9%

−2.5%

−4.3%