Results 171 to 180 of about 4,632 (208)

Poster ‐ 18: New features in EGSnrc for photon cross sections

Medical Physics, 2016
Purpose:To implement two new features in the EGSnrc Monte Carlo system. The first is an option to account for photonuclear attenuation, which can contribute a few percent to the total cross section at the higher end of the energy range of interest to medical physics.
Ali, Elsayed, Mainegra-Hing, Ernesto, Rogers, David W.O.   +2 more
openaire   +1 more source

Three-Dimensional Experimental Validation of an EGSnrc Monte Carlo Model for the Elekta Synergy MLCi2 Linear Accelerator

Nuclear science and engineering
The primary challenge in Monte Carlo dose calculations in radiotherapy is accurate modeling of the radiation device and the initial electron beam. For this purpose, this study aims to address this challenge by developing and experimentally validating a ...
Yassir El Ghazi, S. Didi, Karim Bahhous, D. Bakari, A. Rrhioua, M. Zerfaoui   +5 more
semanticscholar   +1 more source

An inter-comparison between accuracy of EGSnrc and MCNPX Monte Carlo codes in dosimetric characterization of intraoperative electron beam

Comput. Biol. Medicine, 2020
BACKGROUND Ionometric dosimetry in IOERT is a complicated process, due to the sophisticated beam setup and the necessity for dedicated protocols for ion chamber response correction.
S. Lashkari, H. Baghani, M. Tavakoli, S. Mahdavi   +3 more
semanticscholar   +1 more source

An EGSnrc Monte Carlo‐calculated database of TG‐43 parameters

Medical Physics, 2008
Monte Carlo methods are used to calculate a complete TG‐43 dosimetry parameter data set for 27 low‐energy photon emitting brachytherapy sources (18 and 9 ). All Monte Carlo calculations are performed using the EGSnrc user‐code BrachyDose. TG‐43 dosimetry parameters, including dose rate constants, radial dose functions (with functional fitting ...
R E P, Taylor, D W O, Rogers
openaire   +2 more sources

The EGSnrc System, a Status Report

2001
EGSnrc [1] is a general-purpose package for the Monte Carlo simulation of coupled electron-photon transport that is based on the popular EGS4 system but incorporates a variety of improvements in the class II implementation of the condensed history technique and the modelling of the underlying physical processes.
Kawrakow, I., Rogers, D. W.O.
openaire   +3 more sources

Development of an EGSnrc multi‐leaf collimator component module and treatment head model for a low‐field MRI linear accelerator

Medical Physics (Lancaster)
Monte Carlo (MC) modeling of MR‐guided radiotherapy (MRgRT) treatment machines enables the characterization of photon/electron interactions in the presence of a magnetic field.
Thomas G. Etienne, Joshua H Kim, Kundan Thind, I.J. Chetty   +3 more
semanticscholar   +1 more source

Cross section improvements for EGSnrc

Proceedings of the 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (Cat. No.00CH37143), 2002
The inclusion of spin effects for electron/positron elastic scattering, binding effects for incoherent photon scattering and atomic relaxations into EGSnrc is described. The effects of these improvements on calculated depth-dose curves and plane-parallel chamber calculations is presented.
openaire   +1 more source

Detailed high‐accuracy megavoltage transmission measurements: A sensitive experimental benchmark of EGSnrc

Medical Physics, 2012
Purpose:There are three goals for this study: (a) to perform detailed megavoltage transmission measurements in order to identify the factors that affect the measurement accuracy, (b) to use the measured data as a benchmark for theEGSnrc system in order to identify the computational limiting factors, and (c) to provide data for others to benchmark Monte
Ali, E.S.M., McEwen, M.R., Rogers, D.W.O.   +2 more
openaire   +2 more sources

Technical Note: Implications of using EGSnrc instead of EGS4 for extracting electron stopping powers from measured energy spectra.

Medical Physics (Lancaster), 2020
PURPOSE NRC Report PIRS 0626 (https://doi.org/10.4224/40000364) describes how measured electron energy deposition spectra can be used to determine the electronic stopping power.
F. Tessier, C. Ross
semanticscholar   +1 more source

Comparison between EGSnrc, Geant4, MCNP5 and Penelope for mono-energetic electron beams

Physics in Medicine and Biology, 2015
A simple geometry is chosen to highlight similarities and differences of current electron transport algorithms implemented in four Monte Carlo codes commonly used in radiation physics. Energy deposited in a water-filled sphere by mono-energetic electron beams was calculated using EGSnrc, Geant4, MCNP5 and Penelope as the radius of the sphere varied ...
Archambault, John Paul, Mainegra-Hing, Ernesto   +1 more
openaire   +2 more sources