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Dose Delivery: Passive
•
As range shifter is up-
stream of scatterers,
extent of SOBP is fixed
across field (Only distal
conformity)
→
The complete target volume is irradiated nearly simultaneously
•
Each delivered field
(incident direction of
irradiation) requires
specific collimator and
compensator
Shardt D et al Review of Modern Physics (82) 2010