Results 151 to 160 of about 1,765 (182)

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
BACKGROUND: 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.
Thind, Kundan, Etienne, Thomas, Chetty, Indrin J, Kim, Joshua   +3 more
exaly   +2 more sources

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

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
exaly   +3 more sources

Technical Note: An hybrid parallel implementation for EGSnrc Monte Carlo user codes

Medical Physics, 2018
PurposeThe purpose of this study was to present a parallel solution for the EGSnrc Monte Carlo code system combining MPI and OpenMP programming models as an alternative to the provided implementation, based on the use of a batch‐queueing system (BQS).MethodsRelying on a previous implementation based on OpenMP by E. Doerner and P. Caprile [Med. Phys. 44,
Doerner, Edgardo, Caprile Etchart, Paola F.   +1 more
openaire   +3 more sources

EGSnrc Monte Carlo calculated dosimetry parameters for and brachytherapy sources

Medical Physics, 2008
This study presents the results of EGSnrc Monte Carlo calculations of the dose distribution surrounding a high dose rate brachytherapy source and 14 high dose rate and pulsed dose rate brachytherapy sources. Energy‐weighted spectra of emitted photons, a full set of TG‐43 dosimetry parameters, along‐away dose tables, and a description of the materials
R. E. P. Taylor, D. W. O. Rogers
openaire   +1 more source

An EGSnrc investigation of the correction factor for ion chambers in kilovoltage x rays

Medical Physics, 2006
As part of the standard practice for obtaining consistent ion chamber measurements with cavities open to the surrounding atmosphere, the raw measured response is corrected to the response at a reference temperature and pressure using the standard temperature‐pressure correction factor . In this study, the EGSnrc Monte Carlo code was used to investigate
Daniel J, La Russa, D W O, Rogers
openaire   +2 more sources

Consistency evaluation between EGSnrc and Geant4 charged particle transport in an equilibrium magnetic field

Physics in Medicine and Biology, 2013
Following the proposal by several groups to integrate magnetic resonance imaging (MRI) with radiation therapy, much attention has been afforded to examining the impact of strong (on the order of a Tesla) transverse magnetic fields on photon dose distributions.
Y M, Yang, B, Bednarz
openaire   +2 more sources

Monte Carlo simulation of backscatter from lead for clinical electron beams using EGSnrc

Medical Physics, 2008
In electron radiotherapy of superficial lesions in the eyelid, lip, buccal mucosa, ear, and nose, backscattered electrons are produced from the lead shield used to protect the critical tissue underneath the tumor. In this study, the backscattered electrons, produced by clinical electron beams using a Varian 21 EX linear accelerator, were studied using ...
James C L, Chow, Grigor N, Grigorov
openaire   +2 more sources

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

Medical Physics, 2021
Frédéric Tessier
exaly