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Kernel-based methods:
‘Collapsed Cone’ approximation for efficient density rescaling
•
separate treatment of deposited
primary enery and deposited
phantom scattered dose
•
further approximations for
polyenergetic photon beams
(details depend on
Further ‘smart’ approximations for efficient numerical implementation:
primary photons
primary charged
particles
deposited
primary energy
scattered primary
photons
charged particles from
scattered prim. photons
Direct beam
deposited
ESTRO IMRT course 2016
Dose Calculation in Static and Rotational IMRT
London April 7th, 2016
-36-
implementation): Energy-
averaged TERMA and point
kernel; approximate or no
modelling of beam hardening; …
More details: Ahnesjö and Aspradakis 1999
(PMB 44(11))
Bremsstrahlung and
annihilation photons
charged particles from
Bremsstrahlung and
annihilation photons
deposited scatter
energy
Bremsstrahlung and
annihilation energy
deposited
Primary dose
phantom scatter dose
primary energy
deposited scatter
energy
Bre sstrahlung and
annihilation energy
deposited