Dose Course 2018_Flipping book

44

Varian eMC Global MC input

❑ Conventional MC simulations of electron transport performed in well defined local geometries (“kugels” or spheres). ❑ Local geometries are spheres of various sizes, material compositions and incident electron energies: o 5 materials: air, lung, water, lucite(PMMA) and solid bone o 5 sphere radii: 0.5, 1.0, 1.5, 2.0 and 3.0 mm o 30 incident energy values, between 0.2 and 25 MeV ❑ 200 000 electrons per sphere were simulated using Monte Carlo with EGSnrc Code System ❑ Results from simulations were collected to probability distribution functions (PDFs): o Exit point and direction of primary electron o Energy of primary electron o Secondary particles (e- & γ) and their energies ❑ Global : Particle transport through patient modelled as a series of macroscopic steps, each consisting of one local geometry (“kugel”)

Dublin 2018