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New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom

PURPOSE: In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. MATERIALS AND METHODS: The QA protocols, published by authoritative organizations, such as the American Association of Physicists in Medic...

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Autores principales: Shandiz, Mahdi Heravian, Layen, Ghorban Safaeian, Anvari, Kazem, Khalilzadeh, Mohammadmahdi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Society for Radiation Oncology 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4394068/
https://www.ncbi.nlm.nih.gov/pubmed/25874177
http://dx.doi.org/10.3857/roj.2015.33.1.42
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author Shandiz, Mahdi Heravian
Layen, Ghorban Safaeian
Anvari, Kazem
Khalilzadeh, Mohammadmahdi
author_facet Shandiz, Mahdi Heravian
Layen, Ghorban Safaeian
Anvari, Kazem
Khalilzadeh, Mohammadmahdi
author_sort Shandiz, Mahdi Heravian
collection PubMed
description PURPOSE: In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. MATERIALS AND METHODS: The QA protocols, published by authoritative organizations, such as the American Association of Physicists in Medicine (AAPM), determine the quality control (QC) tests which should be performed on the medical linear accelerators and the threshold levels for each test. The purpose of this study is to increase the accuracy and precision of the selected QC tests in order to increase the quality of treatment and also increase the speed of the tests to convince the crowded centers to start a reliable QA program. A new method has been developed for two of the QC tests; optical distance indicator (ODI) QC test as a daily test and gantry angle QC test as a monthly test. This method uses an image processing approach utilizing the snapshots taken by the CCD camera to measure the source to surface distance (SSD) and gantry angle. RESULTS: The new method of ODI QC test has an accuracy of 99.95% with a standard deviation of 0.061 cm and the new method for gantry angle QC has a precision of 0.43°. The automated proposed method which is used for both ODI and gantry angle QC tests, contains highly accurate and precise results which are objective and the human-caused errors have no effect on the results. CONCLUSION: The results show that they are in the acceptable range for both of the QC tests, according to AAPM task group 142.
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spelling pubmed-43940682015-04-14 New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom Shandiz, Mahdi Heravian Layen, Ghorban Safaeian Anvari, Kazem Khalilzadeh, Mohammadmahdi Radiat Oncol J Original Article PURPOSE: In order to keep the acceptable level of the radiation oncology linear accelerators, it is necessary to apply a reliable quality assurance (QA) program. MATERIALS AND METHODS: The QA protocols, published by authoritative organizations, such as the American Association of Physicists in Medicine (AAPM), determine the quality control (QC) tests which should be performed on the medical linear accelerators and the threshold levels for each test. The purpose of this study is to increase the accuracy and precision of the selected QC tests in order to increase the quality of treatment and also increase the speed of the tests to convince the crowded centers to start a reliable QA program. A new method has been developed for two of the QC tests; optical distance indicator (ODI) QC test as a daily test and gantry angle QC test as a monthly test. This method uses an image processing approach utilizing the snapshots taken by the CCD camera to measure the source to surface distance (SSD) and gantry angle. RESULTS: The new method of ODI QC test has an accuracy of 99.95% with a standard deviation of 0.061 cm and the new method for gantry angle QC has a precision of 0.43°. The automated proposed method which is used for both ODI and gantry angle QC tests, contains highly accurate and precise results which are objective and the human-caused errors have no effect on the results. CONCLUSION: The results show that they are in the acceptable range for both of the QC tests, according to AAPM task group 142. The Korean Society for Radiation Oncology 2015-03 2015-03-31 /pmc/articles/PMC4394068/ /pubmed/25874177 http://dx.doi.org/10.3857/roj.2015.33.1.42 Text en Copyright © 2015. The Korean Society for Radiation Oncology http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Shandiz, Mahdi Heravian
Layen, Ghorban Safaeian
Anvari, Kazem
Khalilzadeh, Mohammadmahdi
New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title_full New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title_fullStr New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title_full_unstemmed New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title_short New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3D phantom
title_sort new methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: image processing by using a 3d phantom
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4394068/
https://www.ncbi.nlm.nih.gov/pubmed/25874177
http://dx.doi.org/10.3857/roj.2015.33.1.42
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