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Table 2 Dose constraints according to the GORTEC group (the French group of radiation oncology for head and neck cancer). D2%: Near maximum absorbed dose

From: A Nomogram to predict parotid gland overdose in head and neck IMRT

Organ at risk

Dose constraint

Spinal cord

D2% < 45Gy

Brainstem

D2% < 54Gy

Optic nerves

D2% < 54Gy

Contralateral parotid

Mean dose < 30Gy, median dose < 26Gy

Ipsilateral parotid

Mean dose: as low as possible

Oral cavity

Mean dose < 30Gy, V30 < 65 %, and V35 < 35 %

Lips

D2% < 30Gy, mean dose < 20Gy