Results 11 to 20 of about 1,530,338 (157)

Evaluation of variance reduction techniques in BEAMnrc Monte Carlo simulation to improve the computing efficiency [PDF]

Journal of Radiation Research and Applied Sciences, 2016
The application of Variance Reduction Techniques (VRT) in Monte Carlo (MC) codes brings significant improvement in efficiency and a significant profit in the time of simulation.
Maged Mohammed, T El Bardouni, E Chakir   +2 more
exaly   +4 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   +3 more sources

How efficient are metal‐polymer and dual‐metals‐polymer non‐lead radiation shields? [PDF]

Journal of Medical Radiation Sciences
Introduction Lead shields are often used to attenuate ionising radiations. However, to make lighter, recyclable and more efficient shields compared to lead, combinations of new metallic compounds together with polymer, for example, flexible polyvinyl ...
Zaker Salehi, Mansour Tayebi Khorami
doaj   +3 more sources

Investigation of Reduction of the Uncertainty of Monte Carlo Dose Calculations in Oncor® Clinical Linear Accelerator Simulation Using the DBS Variance Reduction Technique in Monte Carlo Code BEAMnrc

Majallah-i Dānishgāh-i ’Ulūm-i Pizishkī-i Shahīd Ṣadūqī Yazd, 2017
Purpose: To study the benefits of Directional Bremsstrahlung Splitting (DBS) dose variance reduction technique in BEAMnrc Monte Carlo (MC) code for Oncor® linac at 6MV and 18MV energies. Materials and Method: A MC model of Oncor® linac was built
Amin Asadi, Abolfazl Nickfarjam, Keyvan Jabari   +2 more
doaj   +2 more sources

Monte carlo simulation of siemens oncor linear accelerator with beamnrc and dosxyznrc code

Journal of Medical Signals and Sensors, 2013
The Monte Carlo method is the most accurate method for simulation of radiation therapy equipment. The linear accelerators (linac) are currently the most widely used machines in radiation therapy centers.
Keyvan Jabbari, Hossein Saberi Anvar, Mohammad Bagher Tavakoli, Alireza Amouheidari   +3 more
doaj   +3 more sources

Comparison and validation of multiple detectors against monte carlo simulation for the use of small-field dosimetry [PDF]

Journal of Medical Physics, 2022
Aim: The aim of this study was to compare the Exradin W2 scintillator, PTW microDiamond, IBA Razor Nano, and IBA Razor chamber detectors for small-field dose measurements and validate the measured data against the EGSnrc user code and observe the ...
Nazia Parveen, Prabhakar Ramachandran, Venkatakrishnan Seshadri, Ben Perrett, Andrew Fielding   +4 more
doaj   +2 more sources

Evaluation of RADIANCE Monte Carlo algorithm for treatment planning in electron based Intraoperative Radiotherapy (IOERT) [PDF]

Zeitschrift für Medizinische Physik
Purpose: To perform experimental as well as independent Monte Carlo (MC) evaluation of the MC algorithm implemented in RADIANCE version 4.0.8, a dedicated treatment planning system (TPS) for 3D electron dose calculations in intraoperative radiation ...
Charoula Iliaskou, Giulio Rossi, Ilias Sachpazidis, Vasilios Boronikolas, Mark Gainey, Dimos Baltas   +5 more
doaj   +2 more sources

Patient-specific Effective Dose Estimation from Dose–Length Product in Lung Computed Tomography Using Monte Carlo Simulation [PDF]

Journal of Medical Signals and Sensors
Background: Computed tomography (CT) imaging has a large portion in the dose of patients from radiological procedures; therefore, accurate calculation of radiation risk estimation in this modality is inevitable.
Gholamreza Fallahmohammadi, Zeinab Kordzini Nodeh, Mohammad Mahdavi   +2 more
doaj   +2 more sources

Implementation of a double Gaussian source model for the BEAMnrc Monte Carlo code and its influence on small fields dose distributions

Journal of Applied Clinical Medical Physics, 2016
The shape of the radiation source of a linac has a direct impact on the delivered dose distributions, especially in the case of small radiation fields. Traditionally, a single Gaussian source model is used to describe the electron beam hitting the target, although different studies have shown that the shape of the electron source can be better ...
Dorner Yaksic, Edgardo Andres, Caprile Etchart, Paola F.   +1 more
exaly   +4 more sources

Practical Dosimetry Considerations for Small MLC-Shaped Electron Fields at 60 cm SSD [PDF]

Journal of Biomedical Physics and Engineering, 2022
Superficial tumours can be treated with megavoltage electron beams. The underlying tissue can be spared through the steep dose fall-off gradients over a range of a few centimetres.An accurate Monte Carlo model for an Elekta Precise was determined and ...
Déte Van Eeden, Karl N. Sachse, Freek C.P. Du Plessis   +2 more
doaj   +2 more sources