ATP Barcelona 2017

Passive vs. active particle beam delivery

• Mono-energetic pencil beam scanning (PBS) is widely considered superior to passive techniques.

Planning exercise (single field): double scattering vs. IMPT

PBS - PROs

PBS - CONs

• less passive elements in the beam line • no patient customized passive elements • reduced neutron dose • superior dose distribution • less fields required

• penumbra

• (without mitigation strategies) less robust to organ motion