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Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films

BACKGROUND AND PURPOSE: There is a continual need for more accurate and effective dosimetric systems for quality assurance (QA) as radiotherapy evolves in complexity. The purpose of this project was to introduce a new system that minimally perturbs the main beam, while assessing its real time 2D dos...

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Autores principales: F. Nascimento, Luana, Verellen, Dirk, Goossens, Jo, Struelens, Lara, Vanhavere, Filip, Leblans, Paul, Akselrod, Mark
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807545/
https://www.ncbi.nlm.nih.gov/pubmed/33458340
http://dx.doi.org/10.1016/j.phro.2020.09.008
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author F. Nascimento, Luana
Verellen, Dirk
Goossens, Jo
Struelens, Lara
Vanhavere, Filip
Leblans, Paul
Akselrod, Mark
author_facet F. Nascimento, Luana
Verellen, Dirk
Goossens, Jo
Struelens, Lara
Vanhavere, Filip
Leblans, Paul
Akselrod, Mark
author_sort F. Nascimento, Luana
collection PubMed
description BACKGROUND AND PURPOSE: There is a continual need for more accurate and effective dosimetric systems for quality assurance (QA) as radiotherapy evolves in complexity. The purpose of this project was to introduce a new system that minimally perturbs the main beam, while assessing its real time 2D dose-rate and field shapes. The system combined reusability, linear dose-rate response, and high spatial and time resolution in a single radiation detection technology that can be applied to surface dose estimation and QA. MATERIALS AND METHODS: We developed a 2D prototype system consisting of a camera, focusing lenses and short pass filter, placed on the head of a linear accelerator, facing an Al(2)O(3):C,Mg radioluminescent film. To check the appropriateness of multi‐leaf collimator, stability/reproducibility QA tests were prepared using the treatment planning system: including the routinely used alternating leaves, chair and pyramid checks. RESULTS: The Al(2)O(3):C,Mg film did not perturb the dose vs. depth dose curves determined with a point detector (-0.5% difference). Our results showed a dose-rate linear film response (R(2) = 0.999), from 5 to 600 MU/min. Measured output factors agreed with reference data within ~1%, indicating a potential for small field dosimetry. Both chair and pyramid measured profiles were comparable with those obtained with the treatment planning system within 1%. The alternating leaves test showed an average discrepancy in the valleys of 14%. CONCLUSIONS: The prototype demonstrated promising results. It obviated the need for corrections regarding the relative position of the camera, confirming accurate dose-rate delivery and detection of radiation fields.
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spelling pubmed-78075452021-01-14 Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films F. Nascimento, Luana Verellen, Dirk Goossens, Jo Struelens, Lara Vanhavere, Filip Leblans, Paul Akselrod, Mark Phys Imaging Radiat Oncol Original Research Article BACKGROUND AND PURPOSE: There is a continual need for more accurate and effective dosimetric systems for quality assurance (QA) as radiotherapy evolves in complexity. The purpose of this project was to introduce a new system that minimally perturbs the main beam, while assessing its real time 2D dose-rate and field shapes. The system combined reusability, linear dose-rate response, and high spatial and time resolution in a single radiation detection technology that can be applied to surface dose estimation and QA. MATERIALS AND METHODS: We developed a 2D prototype system consisting of a camera, focusing lenses and short pass filter, placed on the head of a linear accelerator, facing an Al(2)O(3):C,Mg radioluminescent film. To check the appropriateness of multi‐leaf collimator, stability/reproducibility QA tests were prepared using the treatment planning system: including the routinely used alternating leaves, chair and pyramid checks. RESULTS: The Al(2)O(3):C,Mg film did not perturb the dose vs. depth dose curves determined with a point detector (-0.5% difference). Our results showed a dose-rate linear film response (R(2) = 0.999), from 5 to 600 MU/min. Measured output factors agreed with reference data within ~1%, indicating a potential for small field dosimetry. Both chair and pyramid measured profiles were comparable with those obtained with the treatment planning system within 1%. The alternating leaves test showed an average discrepancy in the valleys of 14%. CONCLUSIONS: The prototype demonstrated promising results. It obviated the need for corrections regarding the relative position of the camera, confirming accurate dose-rate delivery and detection of radiation fields. Elsevier 2020-10-05 /pmc/articles/PMC7807545/ /pubmed/33458340 http://dx.doi.org/10.1016/j.phro.2020.09.008 Text en © 2020 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research Article
F. Nascimento, Luana
Verellen, Dirk
Goossens, Jo
Struelens, Lara
Vanhavere, Filip
Leblans, Paul
Akselrod, Mark
Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title_full Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title_fullStr Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title_full_unstemmed Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title_short Two-dimensional real-time quality assurance dosimetry system using μ-Al(2)O(3):C,Mg radioluminescence films
title_sort two-dimensional real-time quality assurance dosimetry system using μ-al(2)o(3):c,mg radioluminescence films
topic Original Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807545/
https://www.ncbi.nlm.nih.gov/pubmed/33458340
http://dx.doi.org/10.1016/j.phro.2020.09.008
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