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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