TABLE 1.

Field arrangements and dose objective/constraints of the plans

	Number of beams	Prescribed dose	Dose objective/constraints
Prostate	9 Coplanar fields	68 Gy/34 fx 53	Prescribed dose covers at least 98% of the PTV Maximum dose to 2% of the PTV = 72.76 Gy Maximum dose to 50% of the bladder and rectum = 65 and 50 Gy, respectively Dose to 25% of rectum = 65 Gy
Liver	5 Coplanar fields	45 Gy/3 fx 54	Dose to 70% of the healthy liver (liver‐CTV) <10 Gy Maximum dose to 30 cm3 of heart <30 Gy
Head and neck (H&N)	7 Coplanar fields	Tumor and lymph nodes = 63 Gy/35 fx Gross tumor and its margins = 70 Gy/35 fx 55 , 56	Maximum doses of spinal cord = 50 Gy Mean dose of larynx = 40 Gy Mean dose of parotid = 20 Gy 56 , 57
Nasal cavity	5 Coplanar fields 2 Non‐coplanar fields	60 Gy/30 fx 58	Maximum dose of optic nerve/chiasm = 55 Gy Maximum dose of brainstem = 54 Gy Maximum dose of lenses = 20 Gy
GBM	3 Coplanar fields 2 Non‐coplanar fields	60 Gy/30 fx 59	OAR dose objectives: same as the H&N
Orbits	2 Coplanar fields 6 Non‐coplanar fields	54 Gy/30 fx 60	OAR dose objectives: same as the H&N