Results 21 to 30 of about 884 (159)

Development and validation of a TOPAS Monte Carlo model for a 0.5 T bi-planar Linac-MR. [PDF]

Med Phys
Abstract Background MR‐guided radiotherapy enables real‐time imaging and adaptive treatment but may introduce magnetic field effects that alter dose deposition. Accurate dose calculation in such settings requires detailed Monte Carlo (MC) modeling. Purpose To develop and validate a detailed MC model of the 0.5 T bi‐planar Linac‐MR with an integrated ...
Gazor A, Reynolds M, Ghila A, Yip E, Wachowicz K, Fallone BG, Wood TR.   +6 more
europepmc   +2 more sources

Monte Carlo analysis of energy deposition and X-ray fluence in cylindrical anode systems. [PDF]

J Appl Clin Med Phys
Abstract Background Cylindrical anode X‐ray systems are increasingly used in multisource imaging; however, electron beam interactions with the curved anodes cause geometric distortions that alter energy deposition and X‐ray emission. Understanding these effects is key to optimizing system performance.
Alharbi MKM, Zhou A, Davidson R, Naunton M, Makanjee C.   +4 more
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

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

Exposure computational models with voxel phantoms coupled to EGSnrc Monte Carlo code

Brazilian Journal of Radiation Sciences, 2023
In computational dosimetry of ionizing radiation, the energy deposited in radiosensitive organs and tissues is evaluated when an anthropomorphic simulator (phantom) is irradiated using Exposure Computational Models (ECMs).
José Wilson Vieira, Viriato Leal Neto, Pedro Henrique Avelino de Andrade, Alex Cristóvão Holanda de Oliveira, Vanildo Júnior de Melo Lima, Isabelle Viviane Batista de Lacerda, Luís Rodrigo Dandrada, Arykerne Nascimento Casado da Silva, William de Souza Santos, Ivan Eufrázio de Santana, Whoody Alem Wanderley Araripe Farias, Larissa Cristina Silva dos Santos, Fernanda Gonçalves Oliveira, Fernando Roberto de Andrade Lima   +13 more
doaj   +1 more source

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

Radiology and mammography standard X-ray spectra simulated with the Monte Carlo method

Brazilian Journal of Radiation Sciences, 2021
Six standard beams described in the TRS-457 (IAEA): RQR 5, 8, M1, M2, M3, M4 were simulated using the EGSnrc Monte Carlo code. Each spectrum was created by an X-ray tube simulated in BEAMnrc, and attenuation curves were obtained using the application ...
Joel Marques Xavier Filho, Iury Santos Silveira, Linda Viola Ehlin Caldas   +2 more
doaj   +1 more source

The effect of algorithms on dose distribution in inhomogeneous phantom: Monaco treatment planning system versus monte carlo simulation

Journal of Medical Physics, 2021
Background: The aim of this study is to evaluate the dose calculation algorithms commonly used in TPS by using MC simulation in the highly different inhomogeneous region and in the small fields and to provide the following uniquely new information in the
Taylan Tuğrul
doaj   +1 more source

Clinical treatment planning for kilovoltage radiotherapy using EGSnrc and Python

Journal of Applied Clinical Medical Physics, 2022
AbstractKilovoltage radiotherapy dose calculations are generally performed with manual point dose calculations based on water dosimetry. Tissue heterogeneities, irregular surfaces, and introduction of lead cutouts for treatment are either not taken into account or crudely approximated in manual calculations.
Nikandrovs, Mihails, McClean, Brendan, Shields, Laura, McCavana, Patrick, Vintró, Luis León   +4 more
openaire   +2 more sources

Determination of Dose Field Distribution of 125I-103Pd Seed Source with Monte-Carlo and Experimental Method

Journal of Isotopes, 2014
Under the same parameters, the Monte Carle codes MCNP5 and EGSnrc were used to calculate the dose field distribution. Measurements of the dose field distributions about the source were performed using LiF thermoluminescent dosimeters(GR-200) in PMMA ...
CAO Zhen1;MENG Bei-di2;ZHANG Wen-zai2;FENG Gen-sheng2;WANG Xiao-jing2
doaj   +1 more source