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Fig. 7 | Radiation Oncology

Fig. 7

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

Fig. 7

The effects of different PTV concepts. In a the effects for a PTV as used in this study consisting of an isotropic margin of 3 mm around the CTV are shown. In b for a PTV concept that has a 5 mm margin at the proximal end and a 7 mm margin at the distal end of the CTV. In c for the same PTV concept as used in a, however, in this case the prescribed dose within this margin is larger than the prescribed dose in the CTV. In black the dose distribution for the non-modulated case and in yellow the dose distribution for the modulated case based on a modulation power of 450 μm. The CTV and the margin as well as the resulting PTV are marked in dashed lines. The red line marks the prescribed dose within the PTV

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