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FFF beams
If we remove it, what will happen?
•
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
Faster Delivery
Beam quality
PDD
Profiles
Output factors
Beam contamination
Out of field dose