title: Application of a Monte Carlo-based method for total scatter factors of small beams to new solid state micro-detectors.
abstract: The scope of this work was to apply a method for estimation of total scatter factors of the smallest beams of the Cyberknife radiosurgery system to newly available solid-state detectors: the PTW 60008 diode, the SunNuclear EdgeDetector diode, and the Thomson and Nielsen TN502RDM micromosfet. The method is based on a consistency check between Monte Carlo simulation of the detectors and experimental results, and was described in a recent publication. Corrected total scatter factors were in excellent agreement with the findings of the former study. The results showed that the diodes tend to overestimate the total scatter factor of small beams, probably due to excessive scatter from the material surrounding the active layer. The correction factor for diodes and for the micromosfet, however, was found to be independent of the electron beam width. This is a desirable characteristic because it allows standard correction factors to be used for treatment units of the same type, without the need of case-by-case Monte Carlo simulation.
authors.affiliation: Department of Medical Physics, ULSS6 "Vicenza", Vicenza, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Francescon
authors.affiliation: Department of Medical Physics, ULSS6 "Vicenza", Vicenza, Italy.
authors.forename: Stefania
authors.initials: S
authors.lastname: Cora
authors.affiliation: Department of Medical Physics, ULSS6 "Vicenza", Vicenza, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Cavedon
authors.affiliation: Department of Medical Physics, ULSS6 "Vicenza", Vicenza, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Scalchi
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design / Q000295:instrumentation; D009010:Monte Carlo Method; D016634:Radiosurgery / Q000295:instrumentation / Q000379:methods*