180 / 1245
46
1.
Two effects:
• Diffused dose from
spiky interleaf
fluence leakage
•
Intraleaf
attenuation
Measuements from
Arnfield
et al
, 2000 Med. Phys.
27
p 2231-2241
Collimator leakage
MLC intraleaf and interleaf
Intraleaf
leakage very small:
0.0408 18.0 8.0
8 cm tungsten
at 3 MeV
e
e
0.28%
t
m