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Table 1 Dose-volume constraints for the PTVs and OAR

From: Effectiveness of Multi-Criteria Optimization-based Trade-Off exploration in combination with RapidPlan for head & neck radiotherapy planning

PTV/Organ Dose-Volume constraint
PTV1 (65Gy prescribed in 30 fractions) 99% volume more than 90% of the dose
95% volume more than 95% of the dose
5% volume less than 105% of the dose
2% volume less than 107% of the dose
PTVLR (54Gy prescribed in 30 fractions) 99% volume more than 90% of the dose
95% volume more than 95% of the dose
PRV Spinal cord The dose for 1% of the volume is limited to 44Gy and no part should receive more than 48 Gy
PRV Brainstem 48 Gy was restricted to no more than 1% of the volume
Optic Nerve 50 Gy was restricted to no more than 1% of the volume
Optic Chiasm 50 Gy was restricted to no more than 1% of the volume
Parotids The maximum mean dose is limited to 24 Gy
Larynx The maximum mean dose is limited to 40 Gy