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3
Model based dose calculations
Energy fluence engine,
multisource
models
•
Finite photon source size
•
Open fluence distribution
•
Fluence modulation
– Step&shot
– Dynamic
– Wedges
•
Head scatter sources
– flattening filter
– collimators
– wedges
•
Monitor back scatter
•
Collimator leakage, including
– MLC interleaf leakage
– shape of MLC leaf ends
•
Beam spectra
•
Spectral changes
•
Electron contamination
Processes
to include