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ESTRO IMRT course 2015
Dose Calculation in Static and Rotational IMRT
Brussels October 8th, 2015
-45-
Dose Calculation as Energy Transport:
Explicit, deterministic
‘solution’
of the
Boltzmann equation vs. its
stochasic
‘solution’
via Monte Carlo.
Linear Boltzmann Transport Equation (LBTE) Solvers
• Raytracing of incident photons and
electrons from virtual sources in the
accelerator head
• same head model as other 2-3-4D
superposition algorithm can be used
• approximations in modelling of phantom
scatter: weakly variable, thus rough
discretization of raytracing possible
•
explicit modelling of local electron
transport
— no kernel density rescaling
necessary
• first implementation in clinical TPS as
Varian Acuros XB
from Fogliata et al. 2011 (6:82)