IGRT 2016 Madrid

Proton Benefit • Proton penumbra not steeper than photons – Dose distribution in high dose region not superior than photons – OAR near target with max dose constraint not spared • Advantage manifested in intermediate and low dose levels • Model based advantage most likely in OAR with considerable volume effects: +Lung, Liver, Parotids - Spinal Cord, Rectum, Brainstem