Dose Course 2018_Flipping book

10

Grid based Boltzman solvers (GBBS) based models 1

❑ Transport o Primary photons are ray-traced in the medium o Scattered photon fluence and the final electron fluence in calculated for each voxel where tissue type and density is known ❑ Deposit o From the differential electron fluence one can apply either stopping electronic power for the medium or water to receive the absorbed dose o Only a biological material can be assigned: lung, adipose tissue, muscle, cartilage, or bone. o The material corresponding to a given HU is hard-coded into a lookup table..

❑ We have either or

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1) Only one system available for radiotherapy – Acuros from Varian

Dublin 2018