Table 1. Metrics/constraints required to be met for radiotherapy (RT) planning.

PTV: Planning target volume; CTV: Clinical target volume; OARs: Organs at risk

Target volume	Priority	Planning goal	Acceptable variation
PTV	1	D99% ≥ 99%	D99% ≥ 95%
	1	D1% ≥ 101%	D1% ≥ 105%
	3	D95% ≥ 100%	D95% ≥ 98%
CTV	3	D99% ≥ 100%	D99% ≥ 98%
	3	D1% ≥ 101%	D1% ≥ 105%
	3	D95% ≥ 100%	D95% ≥ 98%
OARs	-	Constraints	-
Heart	2	Dmean ≤ 17 Gy	Dmean ≤ 18 Gy
	3	V40 Gy ≤ 78%	V40 Gy ≤ 80%
Lungs	2	V20 Gy ≤ 18%	V20 Gy ≤ 20%
	3	V5 Gy ≤ 78%	V5 Gy ≤ 80%
	3	Dmean ≤ 9 Gy	Dmean ≤ 10 Gy
Liver	2	V30 Gy ≤ 35%	V30 Gy ≤ 40%
	2	Dmean ≤ 17 Gy	Dmean ≤ 18 Gy
Kidneys	2	Dmean ≤ 9 Gy	Dmean ≤ 10 Gy
Spinal cord	2	Dmax ≤ 40 Gy	Dmax ≤ 45 Gy