Results 21 to 30 of about 4,632 (208)

Clinical performance of a shielded diode for small field relative dosimetry in a 1.5 T MRI-linac using measurements and simulations. [PDF]

Med Phys
Abstract Background Small field dosimetry on magnetic‐resonance (MR) guided linear accelerators (linacs) has become increasingly more important for accurate beam modeling due to the increase in the number of patients and variety of disease sites treated on MR‐linacs such as those with small fields.
Ferris WS, Czarnecki D, St-Aubin JJ, Hyer DE.   +3 more
europepmc   +2 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 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
openaire   +3 more sources

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

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

Monte Carlo Model Validation of 6MV Beam of OMID, the First Iranian Linear Accelerator. [PDF]

J Med Signals Sens
Monte Carlo (MC) techniques are regarded as an accurate method to simulate the dose calculation in radiotherapy for many years. The present paper aims to validate the simulated model of the 6-MV beam of OMID linear accelerator (BEHYAAR Company) by EGSnrc
Abdoli MA, Hassanvand M, Nejatbakhsh N.
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

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

Z Med Phys
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 ...
Iliaskou C, Rossi G, Sachpazidis I, Boronikolas V, Gainey M, Baltas D.   +5 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