84 / 815
Optic chiasm homogeneity
•
Excessive dose to optic chiasm risks optic neuropathy,
potential loss of sight, blindness
Clinical Scenario:
•
Pituitary Tumour, prescribed dose 50 Gy in 25 fractions
•
Maximum dose to optic chiasm 55 Gy
•
QUANTEC 55Gy <3% risk of optic neuropathy
‘safe’?