Physics Bucharest 2017

FFF beams

If we remove it, what will happen?

Beam quality PDD Profiles Output factors Beam contamination Out of field dose

• Less head scatter

• No beam hardening in the central region → lower mean energy (if the same e - beam is used) → uniform energy spectra across the field • Higher dose rate (FF ≈ 600 MU/min) → 6MV FFF ≈ 1400MU/min → 10MV FFF ≈ 2400MU/min

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