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Dose per MU formalisms:
factor-based dose calculations
(
)
M
SSD d
s
cD
; ,
,
d
c
s
d
SSD
d
How do factor-based formalisms deal with:
• non-square collimator settings
• fields shaped with blocks or MLCs
• points off axis
• modulation with hard wedges
• modulation with ‘soft’ wedges
• other modulations (IMRT fields)
• Inhomogeneities
?