Table 1.

Critical structures mean dose for original and boost IMRT plans

Structure	Original mean dose (Gy) (2 Gy/fx)	Boost mean dose (Gy) (1.8 Gy/fx)	Total dose (Gy)
Chiasm	6.98	3.55	10.52
Left eye	15.93	1.42	17.34
Left optic nerve	13.3	1.96	15.26
Right eye	30.7	3.96	34.65
Right optic nerve	34.09	6.46	40.55

IMRT: Intensity modulated radiation therapy; Gy: Gray.