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Passive vs. active particle beam delivery
• Mono-energetic pencil beam scanning (PBS) is widely considered
superior to passive techniques.
PBS - PROs
PBS - CONs
•
less passive elements
in the beam line
•
penumbra
•
no patient customized
passive elements
•
(without mitigation
strategies) less robust
to organ motion
•
reduced neutron dose
•
superior dose
distribution
•
less fields required
Planning exercise (single field):
double scattering vs. IMPT