Results 111 to 120 of about 525 (147)

The Simulation of Linear Accelerator Using BEAMnrc with DOSXYCnrc

International Conference on Bioinformatics and Biomedical Engineering: [proceedings] International Conference on Bioinformatics and Biomedical Engineering, 2010
Linear accelerator accurate simulation is the prerequisite of Monte Carlo dose calculation algorithm. The study simulated 6MV photon beam produced by Varian 600C medical linear accelerator to derive the mean energy and the full-width half-maximum(FWHM) of incident electron beam intensity distribution (assumed Gaussian distribution) with BEAMnrc and ...
Xin Zhen, Ling-Hong Zhou
exaly   +2 more sources

Inconsistencies in egspp (the EGSnrc C++ class library) and in the SLAB module of BEAMnrc

Physics in Medicine and Biology, 2010
In April 2005, a geometry package to implement almost arbitrary geometries was added to the EGSnrc code system: egspp (Kawrakow 2005 NRCC Report PIRS-899, Kawrakow and Rogers 2006 NRCC Report PIRS-701). During the use of this geometry package, some inconsistencies were found which might lead to dose values that are wrong by up to a factor of 100.
Rolf Behrens
exaly   +3 more sources

Characterization of materials for prosthetic implants using the BEAMnrc Monte Carlo code

Journal of Physics: Conference Series, 2007
Metallic implants degrade image quality and perturb severely the patient dose distribution in external beam radiotherapy. Furthermore, conventional treatment planning systems (TPS) do not accurately account for tissue heterogeneities, especially at the interfaces where high Z gradients are present.
Fabio Baruffaldi, Emiliano Spezi
exaly   +2 more sources

Large efficiency improvements in BEAMnrc using directional bremsstrahlung splitting.

Medical physics, 2004
The introduction into the BEAMnrc code of a new variance reduction technique, called directional bremsstrahlung splitting (DBS), is described. DBS uses a combination of interaction splitting for bremsstrahlung, annihilation, Compton scattering, pair production and photoabsorption, and Russian Roulette to achieve a much better efficiency of photon beam ...
Kawrakow, I., Rogers, D. W.O., Walters, B. R.B.   +2 more
openaire   +4 more sources

Development and validation of a BEAMnrc component module for a miniature multileaf collimator

Physics in Medicine and Biology, 2012
A new component module (CM) named mini multileaf collimator (mMLC) was developed for the Monte Carlo code BEAMnrc. It models the geometry of the add-on miniature multileaf collimator ModuLeaf (MRC Systems GmbH, Heidelberg, Germany, now part of Siemens, Erlangen, Germany). The new CM is partly based on the existing CM called DYNVMLC. The development was
Dörner Yaksic, Edgardo Andrés, Hartmann, G.H.   +1 more
openaire   +3 more sources

Increasing efficiency of BEAMnrc‐simulated Co‐60 beams using directional source biasing

Medical Physics, 2015
Purpose:This study describes the implementation of a directional source biasing (DSB) scheme for efficiently simulating Cobalt‐60 treatment heads using the BEAMnrc Monte Carlo code. Previous simulation of Co‐60 beams with BEAMnrc was impractical because of the time required to track photons not directed into the treatment field and to simulate ...
exaly   +5 more sources

Characteristics of elliptical sources in BEAMnrc Monte Carlo system: Implementation and application

Medical Physics, 2009
Recently, several papers noticed that the electron focal spot of a linear accelerator (linac) could be elliptical which would cause dosimetric discrepancies between measurements and Monte Carlo simulations. To resolve the mismatch, two elliptical source models were developed in BEAMnrc code.
exaly   +3 more sources

Efficient photon beam dose calculations using DOSXYZnrc with BEAMnrc

Medical Physics, 2006
This study examines the efficiencies of doses calculated using DOSXYZnrc for 18 MV (10 X 10 cm2 field size) and 6 MV (10 X 10 cm2 and 20 X 20 cm2 field sizes) photon beams simulated using BEAMnrc. Both phase-space sources and full BEAMnrc simulation sources are used in the DOSXYZnrc calculations.
Kawrakow, I., Walters, B. R.B.
exaly   +5 more sources

Simulating oblique incident irradiation using the BEAMnrc Monte Carlo code

Physics in Medicine and Biology, 2009
A new source for the simulation of oblique incident irradiation has been developed for the BEAMnrc Monte Carlo code. In this work, we describe a method for the simulation of any component that is rotated at some angle relative to the central axis of the modelled radiation unit.
P, Downes, E, Spezi
openaire   +2 more sources

VMC versus BEAMnrc: A comparison of simulated linear accelerator heads for photon beams

Medical Physics, 2008
BEAMnrc, a code for simulating medical linear accelerators based on EGSnrc, has been benchmarked and used extensively in the scientific literature and is therefore often considered to be the gold standard for Monte Carlo simulations for radiotherapy applications.
Hasenbalg, Federico, Fix, Michael, Born, Ernst Johann, Mini, Roberto, Kawrakow, I   +4 more
openaire   +4 more sources