Table 3.

Parameters for OAR during HT planning

OAR	Priority	Blocking	Importance	Histogram dose–volume points
Controlateral lung	1	Directional	1000	5%–7 Gy
30%–3 Gy
50%–2 Gy
Heart	2	Directional	1000	15%–10 Gy
5%–15 Gy
Homolateral lung	3	Directional	1000	50%–5 Gy
15%–20 Gy
5%–30 Gy
Controlateral breast	4	Directional	1000	10%–3 Gy
Spinal cord	5	Directional	300	30%–10 Gy
Liver	6	Directional	300	20%–5 Gy

OAR, organs at risk.