ESTRO course Dose Modelling and Verification 2017

50

Creating a clinically useable electron beam

Traditionally a single foil technique was used 

To get a broad enough beam the single foil has to be quite thick  Significant energy loss and spread. The introduction of a secondary foil downstream reduces these problems since the total foil thickness can be reduced considerably.

ICRU 35 [8]

T Knöös

Warsaw 2017