Fig. 2From: Feasibility of automated proton therapy plan adaptation for head and neck tumors using cone beam CT imagesDVH curves for Pat2 and Pat5 for the high dose PTV (HD PTV), low dose PTV (LD PTV), left (L) parotid gland and spinal cord PRV for the dose distributions of the initial plan on the pCT, rpCT and the adapted plan on the rpCT (rpCTadapt) and vCT (vCTadapt). The LD PTV excludes the HD PTV volume expanded by a 5Â mm marginBack to article page