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Table 2 DVH parameters used in this study. Planning risk volumes were used for the brain stem, spinal cord, optic nerves and optic chiasm. D prescr. is the prescription dose. The TPS-specific DVH objectives used in treatment plan optimization are also presented

From: Feasibility of automated proton therapy plan adaptation for head and neck tumors using cone beam CT images

Organ at risk or target DVH parameters evaluated DVH objectives used for planning
High dose PTV D 95, D 2 , V 95 V 95 = 100 %, D min = 100 % · D prescr., D max < 105 % · D prescr.
High dose CTV D 95, D 2  
Low dose PTV D 95, D 2 , V 95 V 95 = 100 %, D min = 100 % · D prescr., D max < 105 % · D prescr.
Low dose CTV D 95, D 2  
Parotid glands D mean D mean < 26 Gy
Spinal cord D 2 D max < 53 Gy
Brain stem D 2 D max < 53 Gy
Optical nerves D 2 D max < 54 Gy
Optical chiasm D 2 D max < 56 Gy
Eye D 2 D max < 45 Gy
Eye lens D mean D mean < 10 Gy