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Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy

The aim of this work is to present a reproducible methodology for the evaluation of total equivalent doses in organs during proton therapy facilities. The methodology is based on measuring the dose equivalent in representative locations inside an anthropomorphic phantom where photon and neutron dosi...

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Autores principales: Domingo, Carles, Lagares, Juan Ignacio, Romero-Expósito, Maite, Sánchez-Nieto, Beatriz, Nieto-Camero, Jaime J., Terrón, Jose Antonio, Irazola, Leticia, Dasu, Alexandru, Sánchez-Doblado, Francisco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9176390/
https://www.ncbi.nlm.nih.gov/pubmed/35692801
http://dx.doi.org/10.3389/fonc.2022.882476
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author Domingo, Carles
Lagares, Juan Ignacio
Romero-Expósito, Maite
Sánchez-Nieto, Beatriz
Nieto-Camero, Jaime J.
Terrón, Jose Antonio
Irazola, Leticia
Dasu, Alexandru
Sánchez-Doblado, Francisco
author_facet Domingo, Carles
Lagares, Juan Ignacio
Romero-Expósito, Maite
Sánchez-Nieto, Beatriz
Nieto-Camero, Jaime J.
Terrón, Jose Antonio
Irazola, Leticia
Dasu, Alexandru
Sánchez-Doblado, Francisco
author_sort Domingo, Carles
collection PubMed
description The aim of this work is to present a reproducible methodology for the evaluation of total equivalent doses in organs during proton therapy facilities. The methodology is based on measuring the dose equivalent in representative locations inside an anthropomorphic phantom where photon and neutron dosimeters were inserted. The Monte Carlo simulation was needed for obtaining neutron energy distribution inside the phantom. The methodology was implemented for a head irradiation case in the passive proton beam of iThemba Labs (South Africa). Thermoluminescent dosimeter (TLD)-600 and TLD-700 pairs were used as dosimeters inside the phantom and GEANT code for simulations. In addition, Bonner sphere spectrometry was performed inside the treatment room to obtain the neutron spectra, some relevant neutron dosimetric quantities per treatment Gy, and a percentual distribution of neutron fluence and ambient dose equivalent in four energy groups, at two locations. The neutron spectrum at one of those locations was also simulated so that a reasonable agreement between simulation and measurement allowed a validation of the simulation. Results showed that the total out-of-field dose equivalent inside the phantom ranged from 1.4 to 0.28 mSv/Gy, mainly due to the neutron contribution and with a small contribution from photons, 10% on average. The order of magnitude of the equivalent dose in organs was similar, displaying a slow reduction in values as the organ is farther from the target volume. These values were in agreement with those found by other authors in other passive beam facilities under similar irradiation and measurement conditions.
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spelling pubmed-91763902022-06-09 Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy Domingo, Carles Lagares, Juan Ignacio Romero-Expósito, Maite Sánchez-Nieto, Beatriz Nieto-Camero, Jaime J. Terrón, Jose Antonio Irazola, Leticia Dasu, Alexandru Sánchez-Doblado, Francisco Front Oncol Oncology The aim of this work is to present a reproducible methodology for the evaluation of total equivalent doses in organs during proton therapy facilities. The methodology is based on measuring the dose equivalent in representative locations inside an anthropomorphic phantom where photon and neutron dosimeters were inserted. The Monte Carlo simulation was needed for obtaining neutron energy distribution inside the phantom. The methodology was implemented for a head irradiation case in the passive proton beam of iThemba Labs (South Africa). Thermoluminescent dosimeter (TLD)-600 and TLD-700 pairs were used as dosimeters inside the phantom and GEANT code for simulations. In addition, Bonner sphere spectrometry was performed inside the treatment room to obtain the neutron spectra, some relevant neutron dosimetric quantities per treatment Gy, and a percentual distribution of neutron fluence and ambient dose equivalent in four energy groups, at two locations. The neutron spectrum at one of those locations was also simulated so that a reasonable agreement between simulation and measurement allowed a validation of the simulation. Results showed that the total out-of-field dose equivalent inside the phantom ranged from 1.4 to 0.28 mSv/Gy, mainly due to the neutron contribution and with a small contribution from photons, 10% on average. The order of magnitude of the equivalent dose in organs was similar, displaying a slow reduction in values as the organ is farther from the target volume. These values were in agreement with those found by other authors in other passive beam facilities under similar irradiation and measurement conditions. Frontiers Media S.A. 2022-05-25 /pmc/articles/PMC9176390/ /pubmed/35692801 http://dx.doi.org/10.3389/fonc.2022.882476 Text en Copyright © 2022 Domingo, Lagares, Romero-Expósito, Sánchez-Nieto, Nieto-Camero, Terrón, Irazola, Dasu and Sánchez-Doblado https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Oncology
Domingo, Carles
Lagares, Juan Ignacio
Romero-Expósito, Maite
Sánchez-Nieto, Beatriz
Nieto-Camero, Jaime J.
Terrón, Jose Antonio
Irazola, Leticia
Dasu, Alexandru
Sánchez-Doblado, Francisco
Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title_full Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title_fullStr Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title_full_unstemmed Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title_short Peripheral Organ Equivalent Dose Estimation Procedure in Proton Therapy
title_sort peripheral organ equivalent dose estimation procedure in proton therapy
topic Oncology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9176390/
https://www.ncbi.nlm.nih.gov/pubmed/35692801
http://dx.doi.org/10.3389/fonc.2022.882476
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