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ESTRO IMRT course 2015
Dose Calculation in Static and Rotational IMRT
Brussels October 8th, 2015
-26-
Kernel-based methods:
The TERMA concept
primary photon source
s
r
( )
) , (
)(
), (
,
sE E
s
sE sET
prim
Φ⋅ ⋅
=
ρ
µ
mass attenuation
coefficient
primary fluence
raytracing through beam
modulating elements,
fluence scaled by 1/s
2
TERMA:
T
otal
E
nergy
R
eleased per
MA
ss
all energy released at
s
through
physical interactions of the
primary
photon with the medium:
photons, electrons, positrons