title: Deterministic model for dose calculation in photon radiotherapy.
abstract: We present a model for dose calculation in photon radiotherapy based on deterministic transport equations. The model consists of two coupled equations, one for photon and one for electron transport and an equation for the absorbed dose. No assumptions are made with respect to the geometry or the homogeneity of the irradiated medium, so irradiation of any heterogenous medium can be simulated. To get a mathematically simpler model, approximations to the exact equations are presented which keep the essential physical contents of the exact equations, but which can be solved with less numerical effort. The results of dose calculations for simple examples are presented and discussed.
authors.affiliation: Fraunhofer Institut für Techno- und Wirtschaftsmathematik, Fraunhofer-Platz 1, D-67663 Kaiserslautern, Germany. hensel@itwn.fraunhofer.de
authors.forename: Hartmut
authors.initials: H
authors.lastname: Hensel
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Iza-Teran
authors.forename: Norbert
authors.initials: N
authors.lastname: Siedow
mesh_terms: D004583:Electrons; D015233:Models, Statistical; D008962:Models, Theoretical; D009010:Monte Carlo Method; D017785:Photons; D010825:Physics / Q000379:methods; D011874:Radiometry / Q000379:methods*; D011878:Radiotherapy / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted