TABLE IV.

Planning results compared with the clinical acceptance in the HN case.

		Results
	Acceptance criteria	7 beams	15 beams	30 beams
PTV	% vol ⩾ 60Gy > 95	95	95	95
Brainstem	Maximum <54 Gy	Max.: 20.90 Gy (Mean: 2.52 Gy)	Max.: 15.75 Gy (Mean: 2.42 Gy)	Max.: 14.25 Gy (Mean: 2.39 Gy)
Spinal cord	Maximum <45 Gy	Max.: 17.41 Gy (Mean: 2.62 Gy)	Max.: 9.97 Gy (Mean: 2.34 Gy)	Max.: 10.03 Gy (Mean: 2.36 Gy)
Mandible	–	Mean: 14.10 Gy	Mean: 13.82 Gy	Mean: 13.84 Gy
Oral cavity	–	Mean: 6.64 Gy	Mean: 6.61 Gy	Mean: 6.46 Gy

Note: Since mandible and oral cavity have no specific criterions, the mean dose of the structures was provided.