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ESTRO IMRT course 2015
Dose Calculation in Static and Rotational IMRT
Brussels October 8th, 2015
-18-
Field-size depenence of
Output-factor ‘explained’ …
large fields:
•
primary source
fully visible
•
OF-dependence
mainly due to
partial shilding of
secondary source
small fields:
•
secondary source
almost shielded
(=only minimal head
scatter contribution)
•
OF-dependence
mainly due to partial
shielding of primary
source
courtesy M. Sikora