535 / 1245
Sources are all irradiated parts of the treatment head: main source the
flattening
filter
Limited by the collimating devices
Machine design dependent (FFF machines have less – approx 50%reduction
Georg,
Knoos, McClean MP 2011
)
5
10
20
30°
30
35
45
100
[cm]
IC
OC
Ahnesjö 1994 Med. Phys.
21
1227-35
Origin of peripheral dose contributions: Head Scatter