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Volume
segmented
Irradiation type
(partial organ unless
otherwise stated)
Endpoint
Dose (Gy), or
dose/volume
parameters
Rate (%)
Notes on dose/volume
parameters
Whole organ
Whole organ
3D-CRT
Permanent cranial
neuropathy or necrosis
Dmax <54
D1–10 cc < 59
<5
<5
Whole organ
3D-CRT
Permanent cranial
neuropathy or necrosis
Dmax <64
<5
Point dose <<1 cc
Whole organ
SRS (single fraction)
Permanent cranial
neuropathy or necrosis
Dmax <12.5
<5
For patients with acoustic
tumors
Parameters for clinical outcome: Brainstem
•
Lack of information for dose per fraction in the 4 to 8 Gy range and so
there
are not affordable recommendations to be followed in the middle
fractionations area
•
The extrapolation of LQ model to the highest doses may however be incorrect
Mayo C et al. Radiation associated brainstem injury.
Int. J. Radiation Oncology Biol. Phys.,
Vol. 76, No. 3, Supplement, pp. S36–S41, 2010.