IMRT 2018

Kernel-based methods: The TERMA concept



s 

sE



), (

(

)

prim

sET =

E

E

,

 

(

,

)

s 

primary photon source



)(

raytracing through beam modulating elements, fluence scaled by 1/s 2

mass attenuation coefficient

primary fluence

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)

s

r

Neglected in most commercial dose calc. algorithms

ESTRO IMRT course 2017 Dose Calculation in Static and Rotational IMRT Madrid April 13th, 2017

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