ESTRO course Dose Modelling and Verification 2017

39

Rounded collimator edges

The design of the rounded edge can vary, depending on the geometry (thickness, location and maximum over-travel).

Increased leakage if no backup collimator is present

Siemens 160 MLC

Tacke et al [11]

Penumbra widening due to rounded leaf edges

T Knöös

Warsaw 2017