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TYPES OF DOSE CALCULATION
•
Central axis models
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PDD, TMR, PSF etc.
•
Semi-empirical models
•
Based on tables of measured beam
data
•
Bentley-Milan algorithm
•
Pencil-beam
algorithms
Model based
•
2D convolution
•
Convolution algorithms
Model based
•
3D convolution
•
Monte Carlo simulation
•
Limitations in accuracy vs speed
Can be hand
calculations for
point doses
Used on all 2D
planning systems.
Often used for
dose checking
Popular for IMRT
optimisation
Main algorithm today
Boltzmann transport
equation