Fig. 4
From: Effects of the Bragg peak degradation due to lung tissue in proton therapy of lung cancer patients
Depth dose curves of protons in water. In black the Bragg curve as predicted by the treatment-planning system that does not consider the Bragg peak degradation due to the lung tissue. In red and blue the degraded Bragg curves based on modulation powers Pmod of 100 μm and 800 μm. The greater the modulation power the broader the Bragg peak and the less steep the distal fall-off