Table 5 Radiation dose constraints in this study

PTV

Dmean

 = 100% (prescribed dose)

Dmax

 < 110%

 < 113%

D98

 > 93%

 > 90%

CTV

D99

 > 100%

 > 98%

Spinal cord*

Dmax

 < 50 Gy

 < 54 Gy

D1cm³

 < 46 Gy

 < 50 Gy

Brainstem

Dmax

 < 54 Gy

 < 64 Gy

D1cm³

 < 60 Gy

Optic nerve

Dmax

 < 50 Gy

 < 54 Gy

Optic chiasm

Dmax

 < 50 Gy

 < 54 Gy

Eyeball

Dmax

 < 40 Gy

 < 45 Gy

Lens

Dmax

 < 6 Gy

 < 10 Gy

Parotid gland

Dmean

 < 26 Gy

 < 30 Gy

Oral cavity

Dmean

 < 30 Gy

 < 40 Gy

Mandible

D2cm³

 < 66 Gy

 < 72 Gy

Larynx

Dmean

 < 45 Gy

 < 50 Gy

Pharyngeal constrictor

Dmean

 < 54 Gy

 < 60 Gy