IMRT 2018

adapted from Ahnesjö and Aspradikis 1999 (PMB 44(11))

Photons from Target

photon radiant energy

charged particle kinetic energy

deposited energy

air

primary collimator, flattening filter , leaves&jaws

Contaminant electron dose

contaminant electrons

energy deposited by contaminant electrons energy deposited by conta inant electrons

secondary photons (head scatter)

primary photons

scattered primary photons

scattered secondary photons

secondary charged particles

primary charged particles

charged particles from scattered prim. photons Direct beam phantom scatter dose

charged particles from scattered sec. photons

deposited secondary energy deposited secondary energy

deposited primary energy deposited primary energy

Primary dose

Bremsstrahlung and annihilation photons

deposited scatter energy deposited scatter energy

deposited scatter energy deposited scatter energy

Bremsstrahlung and annihilation photons Head scatter dose

charged particles from Bremsstrahlung and annihilation photons

Bremsstrahlung and annihilation energy deposited Bre sstrahlung and annihilation energy deposited

Bremsstrahlung and annihilation energy deposited Bre sstrahlung and annihilation energy deposited

charged particles from Bremsstrahlung and annihilation photons