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Table 3 Dose Constraints for Planning.

From: Dosimetric impact of target definitions on normal structures in head and neck cancer

Structure Maximum Minimum
PTV-HD <20% volume >110% Rx <1% volume <93% Rx
>95% volume >100% Rx
PTV-ID   <1% volume <93% Rx
>95% volume >100% Rx
PTV-ED   <1% volume <93% Rx
>95% volume >100% Rx
Parotid Mean dose <26 Gy or
50% volume <30 Gy
 
Cord <0.03 cc >48 Gy  
  1. Abbreviations: PTV-HD = high dose PTV; PTV-ID = intermediate dose PTV; PTV-ED = elective dose PTV; Rx = prescription dose