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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 

− 

−  

=