Search Results - "Yoriyaz, Hélio"

Dose Measurements for an Ir-192 Source Using Mosfets, Radiochromic Films, TLDs and Heterogeneous Tissues by Fonseca, Gabriel P., MSc, Luvizotto, Jéssica, BS, Guimarães Antunes, Paula Cristina, MSc, Yoriyaz, Hélio, PhD

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Monte Carlo Simulation of HDR Ir-192 Brachytherapy Cancer Treatments by Fonseca, Gabriel P., MSc, Reniers, Brigitte, PhD, Nilsson, Josef, PhD, Persson, Maria, MSc, Tedgren, Åsa Carlsson, PhD, Yoriyaz, Hélio, PhD, Verhaegen, Frank, PhD

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A new human eye model for ophthalmic brachytherapy dosimetry by Yoriyaz, Hélio, Sanchez, Andrea, dos Santos, Adimir

“…The present work proposes a new mathematical eye model for ophthalmic brachytherapy dosimetry. This new model includes detailed description of internal…”
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Heterogeneous physical phantom for I-125 dose measurements and dose-to-medium determination by Antunes, Paula Cristina Guimarães, Siqueira, Paulo de Tarso Dalledone, Shorto, Julian Marco Barbosa, Yoriyaz, Hélio

“…In this paper we present a further step in the implementation of a physical phantom designed to generate sets of "true" independent reference data as requested…”
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A versatile physical phantom design and construction for I-125 dose measurements and dose-to-medium determination by Antunes, Paula Cristina Guimarães, Siqueira, Paulo de Tarso Dalledone, Shorto, Julian Barbosa Marco, Yoriyaz, Hélio

“…In this paper we present a phantom designed to provide conditions to generate set of “true” independent reference data as requested by TG-186, and mitigating…”
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HDR 192Ir source speed measurements using a high speed video camera by Fonseca, Gabriel P., Viana, Rodrigo S. S., Podesta, Mark, Rubo, Rodrigo A., Sales, Camila P., Reniers, Brigitte, Yoriyaz, Hélio, Verhaegen, Frank

“…Purpose: The dose delivered with a HDR 192Ir afterloader can be separated into a dwell component, and a transit component resulting from the source movement…”
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Dose specification for ¹⁹²Ir high dose rate brachytherapy in terms of dose-to-water-in-medium and dose-to-medium-in-medium by Fonseca, Gabriel Paiva, Tedgren, Åsa Carlsson, Reniers, Brigitte, Nilsson, Josef, Persson, Maria, Yoriyaz, Hélio, Verhaegen, Frank

“…Dose calculation in high dose rate brachytherapy with (192)Ir is usually based on the TG-43U1 protocol where all media are considered to be water. Several dose…”
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Monte Carlo studies on water and LiF cavity properties for dose-reporting quantities when using x-ray and brachytherapy sources by Branco, Isabela Soares Lopes, Antunes, Paula Cristina Guimarães, Fonseca, Gabriel Paiva, Yoriyaz, Hélio

“…Model-based dose calculation algorithms (MBDCAs) are the current tools to estimate dose in brachytherapy, which takes into account heterogeneous medium,…”
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Advanced design, simulation, and dosimetry of a novel rectal applicator for contact brachytherapy with a conventional HDR 192Ir source by Bellezzo, Murillo, Fonseca, Gabriel P., Voncken, Robert, Verrijssen, An-Sofie, Van Beveren, Celine, Roelofs, Erik, Yoriyaz, Hélio, Reniers, Brigitte, Van Limbergen, Evert J., Berbée, Maaike, Verhaegen, Frank

“…Dose escalation yields higher complete response to rectal tumors, which may enable the omission of surgery. Dose escalation using 50 kVp contact x-ray…”
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Experimental and Monte Carlo evaluation of the neutron flux of an assembly with two AmBe sources by Filho, Tufic Madi, de Lima, Ruy Barros, Yoriyaz, Hélio, Hernandes, Antonio Carlos

“…This work aimed to determine the irradiator thermal (under-cadmium) and fast (over-cadmium) neutron fluxes, of the Nuclear Experimental Laboratory of the…”
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The use of tetrahedral mesh geometries in Monte Carlo simulation of applicator based brachytherapy dose distributions by Fonseca, Gabriel Paiva, Landry, Guillaume, White, Shane, D'Amours, Michel, Yoriyaz, Hélio, Beaulieu, Luc, Reniers, Brigitte, Verhaegen, Frank

“…Accounting for brachytherapy applicator attenuation is part of the recommendations from the recent report of AAPM Task Group 186. To do so, model based dose…”
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Validating a virtual source model based in Monte Carlo method for profiles and percent depth doses calculation by Del Nero, Renata Aline, Nakaoka Nakandakari, Marcos Vinicius, Yoriyaz, Hélio

“…The Monte Carlo method for radiation transport has been adapted for medical physics application. More specifically, it has received more attention in clinical…”
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Correction factors for non-uniform large-area reference sources by Silva, Iremar Alves, Siqueira, Paulo de T.D., Nascimento, Eduardo do, Yoriyaz, Hélio, Sordi, Gian-Maria A.A., Vivolo, Vitor, Potiens, Maria da Penha A.

“…Based on uniformity measurements of large-area reference sources used in calibration procedures of surface contamination monitors, an investigation was carried…”
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Variability - Surface intensity distribution of large-area reference sources by Silva, Iremar Alves da, Siqueira, Paulo de T.D., Nascimento, Eduardo do, Yoriyaz, Hélio, Sordi, Gian-Maria A.A., Potiens, Maria da Penha A.

“…In this paper we present the impact of variability, a surface source parameter, on the efficiency evaluation of surface contamination monitors. This study was…”
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A novel rectal applicator for contact radiotherapy with HDR 192Ir sources by Bellezzo, Murillo, Fonseca, Gabriel P., Verrijssen, An-Sofie, Voncken, Robert, Van den Bosch, Michiel R., Yoriyaz, Hélio, Reniers, Brigitte, Berbée, Maaike, Van Limbergen, Evert J., Verhaegen, Frank

“…Dose escalation to rectal tumors leads to higher complete response rates and may thereby enable omission of surgery. Important advantages of endoluminal…”
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Cytogenetic and dosimetric effects of 131I in patients with differentiated thyroid carcinoma: comparison between stimulation with rhTSH and thyroid hormone withdrawal treatments by da Silva, Márcia Augusta, Valgôde, Flávia Gomes Silva, Gonzalez, Júlia Armiliato, Yoriyaz, Hélio, Guimarães, Maria Inês Calil Cury, Ribela, Maria Teresa Carvalho Pinto, Buchpiguel, Carlos Alberto, Bartolini, Paolo, Okazaki, Kayo

“…A study directed to the cytogenetic and dosimetric aspects of radionuclides of medical interest is very valuable, both for an accurate evaluation of the dose…”
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Computational model of a 3D dosimetry system - ArcCHECK by Mazer, Amanda Cristina, Nakandakari, Marcos Vinicius Nakaoka, Ribeiro, Victor Augusto Bertotti, Siqueira, Paulo De Tarso Dalledone, Shorto, Julian Marco Barbosa, Yoriyaz, Hélio

“…Ionizing radiation therapies have been improving over the years, becoming more specific for each patient. Thereby, as the treatment planning system (TPS)…”
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A medical image-based graphical platform—Features, applications and relevance for brachytherapy by Fonseca, Gabriel P, Reniers, Brigitte, Landry, Guillaume, White, Shane, Bellezzo, Murillo, Antunes, Paula C.G, de Sales, Camila P, Welteman, Eduardo, Yoriyaz, Hélio, Verhaegen, Frank

“…Abstract Purpose Brachytherapy dose calculation is commonly performed using the Task Group-No 43 Report-Updated protocol (TG-43U1) formalism. Recently, a more…”
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Physical models, cross sections, and numerical approximations used in MCNP and GEANT4 Monte Carlo codes for photon and electron absorbed fraction calculation by Yoriyaz, Hélio, Moralles, Maurício, de Tarso Dalledone Siqueira, Paulo, da Costa Guimarães, Carla, Belonsi Cintra, Felipe, dos Santos, Adimir

“…Purpose: Radiopharmaceutical applications in nuclear medicine require a detailed dosimetry estimate of the radiation energy delivered to the human tissues…”
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Monte Carlo MCNP-4B-Based Absorbed Dose Distribution Estimates for Patient-Specific Dosimetry by Yoriyaz, Helio, Stabin, Michael G, Santos, Adimir dos

“…This study was intended to verify the capability of the Monte Carlo MCNP-4B code to evaluate spatial dose distribution based on information gathered from CT or…”
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