Dose Course 2018_Flipping book

Flattening of the primary photon beam

The conical flattening filter absorbs 50-90% of the direct photons on the central axis. In addition, it works as a scatter source located 7-15 cm downstream from the target, adding 5-10% at isocenter.

e -

Lateral fluence distribution

h 

Before ff

After ff

Steel, Brass, Lead...

Dublin 2018