Fig. 2

Isodose distributions of an example patient showing multiple slices, from (a) IMRT, (b) anatomical double scattering proton treatment (aDSPT), (c) functional double scattering proton treatment (fDSPT), (d) anatomical intensity modulated proton treatment (aIMPT), (c) functional intensity modulated proton treatment (fIMPT) plans. The PTV is highlighted in red and high-functional lung regions are in orange