2620-2621 / 2953
Field-size depenence of
Output-factor ‘explained’ …
large fields:
•
primary source
fully visible
•
OF-dependence
small fields:
•
secondary source
almost shielded
(=only minimal head
scatter contribution)
courtesy M. Sikora
ESTRO IMRT course 2016
Dose Calculation in Static and Rotational IMRT
London April 7th, 2016
-18-
mainly due to
partial shielding of
secondary source
•
OF-dependence
mainly due to partial
shielding of primary
source