Table 1.

Organ at risk constraints used in the planning process

Target structures	Volume constraint (%)	Dose required [% (Gy)]
Prostate PTV	99	90 (66.6)
	95	95 (70.3)
	50	100 (74)
	5	105 (77.7)
Nodal PTV	99	90 (49.5)
	95	95 (52.3)
	50	100 (55)
	PTV, planned target volume.
Risk structures	Dose constraint (Gy)	Volume required
Rectum	50	60%
	60	50%
	65	30%
	70	15%
	75	0%
Bladder	50	50%
	60	25%
	70	5%
Bowel	45	158 cm3
	50	110 cm3
	55	28 cm3
	60	6 cm3
	65	0 cm3
Femoral heads	50	50%