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A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy

BACKGROUND: Symmetry and flatness are two quantities which should be evaluated in the commissioning and quality control of an electron beam in electron beam radiotherapy. The aim of this study is to compare symmetry and flatness obtained using three different dosimeters for various small and large f...

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Autores principales: Bayatiani, Mohamad Reza, Fallahi, Fatemeh, Aliasgharzadeh, Akbar, Ghorbani, Mahdi, Khajetash, Benyamin, Seif, Fatemeh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Via Medica 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8086714/
https://www.ncbi.nlm.nih.gov/pubmed/33948302
http://dx.doi.org/10.5603/RPOR.a2021.0009
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author Bayatiani, Mohamad Reza
Fallahi, Fatemeh
Aliasgharzadeh, Akbar
Ghorbani, Mahdi
Khajetash, Benyamin
Seif, Fatemeh
author_facet Bayatiani, Mohamad Reza
Fallahi, Fatemeh
Aliasgharzadeh, Akbar
Ghorbani, Mahdi
Khajetash, Benyamin
Seif, Fatemeh
author_sort Bayatiani, Mohamad Reza
collection PubMed
description BACKGROUND: Symmetry and flatness are two quantities which should be evaluated in the commissioning and quality control of an electron beam in electron beam radiotherapy. The aim of this study is to compare symmetry and flatness obtained using three different dosimeters for various small and large fields in electron beam radiotherapy with linac. MATERIALS AND METHODS: Beam profile measurements were performed in a PTW water phantom for 10, 15 and 18 MeV electron beams of an Elekta Precise linac for small and large beams (1.5 × 1.5 cm(2) to 20 × 20 cm(2) field sizes). A Diode E detector and Semiflex-3D and Advanced Markus ionization chambers were used for dosimetry. RESULTS: Based on the obtained results, there are minor differences between the responses from different dosimeters (Diode E detector and Semiflex-3D and Advanced Markus ionization chambers) in measurement of symmetry and flatness for the electron beams. The symmetry and flatness values increase with increasing field size and electron beam energy for small and large field sizes, while the increases are minor in some cases. CONCLUSIONS: The results indicate that the differences between the symmetry and flatness values obtained from the three dosimeter types are not practically important.
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spelling pubmed-80867142021-05-03 A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy Bayatiani, Mohamad Reza Fallahi, Fatemeh Aliasgharzadeh, Akbar Ghorbani, Mahdi Khajetash, Benyamin Seif, Fatemeh Rep Pract Oncol Radiother Research Paper BACKGROUND: Symmetry and flatness are two quantities which should be evaluated in the commissioning and quality control of an electron beam in electron beam radiotherapy. The aim of this study is to compare symmetry and flatness obtained using three different dosimeters for various small and large fields in electron beam radiotherapy with linac. MATERIALS AND METHODS: Beam profile measurements were performed in a PTW water phantom for 10, 15 and 18 MeV electron beams of an Elekta Precise linac for small and large beams (1.5 × 1.5 cm(2) to 20 × 20 cm(2) field sizes). A Diode E detector and Semiflex-3D and Advanced Markus ionization chambers were used for dosimetry. RESULTS: Based on the obtained results, there are minor differences between the responses from different dosimeters (Diode E detector and Semiflex-3D and Advanced Markus ionization chambers) in measurement of symmetry and flatness for the electron beams. The symmetry and flatness values increase with increasing field size and electron beam energy for small and large field sizes, while the increases are minor in some cases. CONCLUSIONS: The results indicate that the differences between the symmetry and flatness values obtained from the three dosimeter types are not practically important. Via Medica 2021-02-25 /pmc/articles/PMC8086714/ /pubmed/33948302 http://dx.doi.org/10.5603/RPOR.a2021.0009 Text en © 2021 Greater Poland Cancer Centre https://creativecommons.org/licenses/by-nc-nd/4.0/This article is available in open access under Creative Common Attribution-Non-Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially
spellingShingle Research Paper
Bayatiani, Mohamad Reza
Fallahi, Fatemeh
Aliasgharzadeh, Akbar
Ghorbani, Mahdi
Khajetash, Benyamin
Seif, Fatemeh
A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title_full A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title_fullStr A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title_full_unstemmed A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title_short A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
title_sort comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy
topic Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8086714/
https://www.ncbi.nlm.nih.gov/pubmed/33948302
http://dx.doi.org/10.5603/RPOR.a2021.0009
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