Results 41 to 50 of about 4,632 (208)

Comparison of MCNPX and EGSnrc Monte Carlo Codes in the Calculation of Nano-Scaled Absorbed Doses and Secondary Electron Spectra around Clinically Relevant Nanoparticles

Frontiers in Biomedical Technologies, 2023
Purpose: Absorbed dose enhancement due to the presence of high atomic number nanoparticles (NP)s has been estimated and modeled by Monte Carlo (MC) simulation methods.
Asghar Mesbahi, Mostafa Robatjazi, Hamid Reza Baghani, Elham Mansouri, Mohammad Mohammadi   +4 more
doaj   +1 more source

Validação dosímetrica de trabéculas ósseas sintéticas geradas por método Monte Carlo paramétrico

Brazilian Journal of Radiation Sciences, 2018
Um dos maiores desafios da dosimetria numérica é estimar a dose de radiação ionizante absorvida pelos tecidos moles que se localizam nas trabéculas ósseas. Em função da dificuldade na obtenção de imagens micro-CT de amostras de ossos reais (OR), surgiu a
Fernanda Gonçalves Oliveira, Arthur Andrade, José Vieira, Alex Oliveira, Fernando Lima   +4 more
doaj   +1 more source

4089 Clinical Implementation of Monte Carlo Dose Calculation for Patient-Specific Radiotherapy Quality Assurance

Journal of Clinical and Translational Science, 2020
OBJECTIVES/GOALS: The Monte Carlo dose calculation method is often considered the “gold standard” for patient dose calculations and can be as radiation dose measurements.
Holly Marie Parenica, Christopher Kabat, Pamela Myers, Neil Kirby, Pavlos Papaconstadopoulos, Nikos Papanikolaou, Sotirios Stathakis   +6 more
doaj   +1 more source

A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy [PDF]

, 2017
Cone-beam CT (CBCT) scans utilized for image guided radiation therapy (IGRT) procedures have become an essential part of radiotherapy. The aim of this study was to assess organ and effective doses resulting from new CBCT scan protocols (head, thorax, and
Abuhaimed, Abdullah, Martin, Colin J., Sankaralingam, Marimuthu   +2 more
core   +1 more source

A GPU implementation of EGSnrc's Monte Carlo photon transport for imaging applications [PDF]

Physics in Medicine and Biology, 2011
EGSnrc is a well-known Monte Carlo simulation package for coupled electron-photon transport that is widely used in medical physics application. This paper proposes a parallel implementation of the photon transport mechanism of EGSnrc for graphics processing units (GPUs) using NVIDIA's Compute Unified Device Architecture (CUDA).
Jonas, Lippuner, Idris A, Elbakri
openaire   +2 more sources

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 B, Wood T.   +6 more
europepmc   +2 more sources

Development of a pregnant woman phantom using polygonal mesh, for dosimetric evaluations

Brazilian Journal of Radiation Sciences, 2015
Due to the embryo/fetus radiosensitivity the accurate estimation of the absorbed dose distribution in the abdominal area is an additional problem caused by the exposure of pregnant women to ionizing radiation in medical applications.
Manuela Ohana Monteiro Cabral, José Wilson Vieira, Viriato Leal Neto, Fernando Roberto de Andrade Lima   +3 more
doaj   +1 more source

Evaluation of the TG-43 formalism for intraoperative radiotherapy dosimetry in glioblastoma treatment. [PDF]

Med Phys
Abstract Background Intraoperative radiation therapy (IORT) using the INTRABEAM system has shown promise in glioblastoma treatment. However, accurate dosimetry remains challenging due to the low‐energy photons used and the heterogeneity of tissues in the brain. Current clinical practice relies on the TARGIT method, but more robust approaches, including
Ayala Alvarez DS, Watson PGF, Popovic M, Heng VJ, Evans MDC, Panet-Raymond V, Seuntjens J.   +6 more
europepmc   +2 more sources

EGSnrc calculation of activity calibration factors for the Vinten ionization chamber.

Applied Radiation and Isotopes, 2017
The National Physical Laboratory Vinten 671 chamber was selected as a proving ground for a new radionuclide source model in the EGSnrc software. The computational Vinten model is validated against measurements of radionuclide artifacts whose activities were determined by absolute methods.
R. Townson, F. Tessier, R. Galea
semanticscholar   +4 more sources

Characterization of a 0.5 × 0.5 mm plastic scintillating detector for small field dosimetry: Its performance and comparison with other commercially available plastic scintillating detectors. [PDF]

J Appl Clin Med Phys
Abstract Background Lack of an ideal detector for small field dosimetry has led to the development of many new types of detectors. Recent studies have shown that plastic scintillation detectors (PSDs) provide favorable dosimetric characteristics, such as minimal volume averaging and fluence perturbation effects, real time response rates, high signal to
Baradaran-Ghahfarokhi M, Grees B, Cooney A, Northern E, Ding G, Luo G, Homann K.   +6 more
europepmc   +2 more sources