Dose 2016
10
Geometric penumbra
The source related geometric penumbra (10-90%) typically has a width of 3-5 mm at isocenter level, but can in more extreme cases extend up to about 10 mm. Particularly important for small beams and IMRT.
d
coll
d
iso
(SAD)
Ψ
d
Isocenter
Back to MLC penumbras
Utrecht 2016
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