Results 11 to 20 of about 2,643 (174)

An Efficiency Studying of an Ion Chamber Simulation Using Vriance Reduction Techniques with EGSnrc [PDF]

Journal of Biomedical Physics and Engineering, 2019
Background: Radiotherapy is an important technique of cancer treatment using ionizing radiation. The determination of total dose in reference conditions is an important contribution to uncertainty that could achieve 2%.
Campos L. T., Magalhães L. A., de Almeida C. E. V.   +2 more
doaj   +3 more sources

Detector response and dose calculation lateral to material interfaces for 6 MV photon beam. [PDF]

J Appl Clin Med Phys
Abstract Background Dose calculation around inhomogeneities is challenging for many algorithms. A validation of dose distributions in these conditions is not straightforward, as detector response close to material interfaces is affected by the non‐equilibrium situation, the changing energy spectrum and the volume effect in a steep dose gradient ...
Ringholz J, Sauer OA, Wegener S.
europepmc   +2 more sources

A Comparison between Electron Gamma Shower, National Research Council/Easy Particle Propagation (EGSnrc/Epp) and Monte Carlo N-Particle Transport Code (MCNP) in Simulation of the INTRABEAM ® System with Spherical Applicators [PDF]

Journal of Biomedical Physics and Engineering, 2021
Background: Online Monte Carlo (MC) treatment planning is very crucial to increase the precision of intraoperative radiotherapy (IORT). However, the performance of MC methods depends on the geometries and energies used for the problem under study ...
E M Tegaw, Gh Geraily, S M Etesami, S Gholami, H Ghanbari, M Farzin, G F Tadesse, M Shojaei   +7 more
doaj   +1 more source

Reference datasets for commissioning of model-based dose calculation algorithms for electronic brachytherapy. [PDF]

Med Phys
Abstract Purpose This work provides the first two clinical test cases for commissioning electronic brachytherapy (eBT) model‐based dose calculation algorithms (MBDCAs) for skin irradiation using surface applicators. Acquisition and Validation Methods The test cases utilize the INTRABEAM 30 mm surface applicator.
Mansour IR, Valdes-Cortez C, Ayala Alvarez DS, Berumen F, Côte JS, Ndoutoume-Paquet G, Watson PGF, Seuntjens J, Ballester F, Mainegra-Hing E, Thomson RM, Beaulieu L, Vijande J.   +12 more
europepmc   +2 more sources

A Monte Carlo approach to optimising a primary collimator design using EGSnrc

Physics Open
The primary collimator in a clinical linear accelerator (linac) plays a vital role in the radiation shielding of the machine. One objective of the collimation system is to reduce head leakage to less than 0.1 % relative to the dose on the central axis of
Anthony Criscuolo, Tracy Underwood, Rebecca Nutbrown, David Shipley, Russell Thomas, Patrick H. Regan, Michael W. Kissick   +6 more
doaj   +2 more sources

Monte Carlo modeling of radiation dose from radiation therapy with superficial x-rays. [PDF]

J Appl Clin Med Phys
Abstract Introduction Superficial x‐rays (50–100 kVp) are used for treating non‐melanoma skin cancer and intraoperative radiation therapy (IORT). At these energies, the photoelectric effect significantly increases absorbed dose to bone compared to soft tissue.
Barghash R, Martin TW, Prebble AR, Leary D.   +3 more
europepmc   +2 more sources

Novel validation of HDR brachy therapy dosimetry for cervical cancer using egs_brachy Monte Carlo simulations: a comparative analysis with Oncentra treatment planning system. [PDF]

J Appl Clin Med Phys
Abstract Purpose This study aims to validate HDR brachytherapy dosimetry for cervical cancer patients utilizing the egs_brachy Monte Carlo (MC) simulation. Methods Three cervical cancer patients treated with 192Ir HDR brachytherapy were included. Dose distributions were calculated by the Oncentra Brachy v4 treatment planning system (TPS) based on AAPM ...
Tai DT, Thu NTA, Thanh TT, Tuan PA, Chamberland MJP, Sandwall P, Bradley D, Chow JCL.   +7 more
europepmc   +2 more sources

Effect of immobilization mask and beam energy on dose coverage to small joints in treating osteoarthritis with low-dose radiation therapy. [PDF]

Med Phys
Abstract Purpose Osteoarthritis (OA) is the most common form of arthritis, affecting over 32 million Americans. Low dose radiation therapy (LDRT) is being used to treat OA, including small joints. Treatment energies recommended include both orthovoltage and 6 MV photons.
Ding GX, Homann KL, Shinohara ET.
europepmc   +2 more sources

Development of anthropomorphic computational phantoms at the UFPE

Brazilian Journal of Radiation Sciences, 2023
To evaluate the amount of energy deposited in radiosensitive organs and tissues of the human body, when an anthropomorphic phantom is irradiated, researchers in numerical dosimetry use the so-called exposure computational models (ECMs).
José Wilson Vieira, Pedro Henrique Avelino Andrade, Alex Cristóvão Holanda Oliveira, Vanildo Júnior de Melo Lima, Isabelle Viviane Batista Lacerda, Arykerne Casado Silva, Ivan Eufrázio Santana, Whoody Alem Wanderley Farias, Larissa Cristina Silva Santos, Fernanda Gonçalves Oliveira, Fernando Roberto de Andrade Lima   +10 more
doaj   +1 more source

The dosimetric effect of photon target degradation on C-series linear accelerators using Monte Carlo simulation. [PDF]

J Appl Clin Med Phys
Abstract Background The impact of beam dosimetry changes brought on by target degradation has not been well investigated. Purpose To determine the optimal dosimetry metrics for detecting target degradation and to investigate the impact of beam dosimetry changes brought on by target degradation. Methods The EGSnrc Monte Carlo programs were used to model
Deng Y, Qiu M, Zhong J, Xiao Z.
europepmc   +2 more sources