Table 2.

Dose constraints to organs at risk (OAR)

Organ at risk	Dose constraints
Total normal lung volume excluding the CTV	D mean < 20 Gy
	V20 < 30%
	V30 < 20%
	V5 < 65%
Heart	V30 < 50%
PRV Spinal cord	D2% < 45 Gy
PRV Oesophagus	D2% < 66 Gy
	V60 < 10%
	V50 < 30%

CTV clinical target volume, D mean mean dose, PRV planning organ at risk volume, Vx percentage of the total organ volume receiving ≥ xGy