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Dosimetry audit for megavoltage photon beams applied in non-reference conditions

We have conducted for the first time a Malaysian postal dosimetry audit of external beam under nonreference conditions by evaluating the output performance while screening for systematic errors within the dosimetry chain. The potential use from the choice of detector were investigated along with the...

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Main Authors: Fadzil, Muhammad Safwan Ahmad, Noor, Noramaliza Mohd, Min, Ung Ngie, Abdullah, Norhayati, Dolah, Mohd Taufik, Pawanchek, Mahzom, Bradley, David Andrew
Format: Article
Published: Elsevier 2022
Subjects:
R Medicine
Online Access:http://eprints.um.edu.my/41434/
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spelling my.um.eprints.414342023-09-22T06:41:08Z http://eprints.um.edu.my/41434/ Dosimetry audit for megavoltage photon beams applied in non-reference conditions Fadzil, Muhammad Safwan Ahmad Noor, Noramaliza Mohd Min, Ung Ngie Abdullah, Norhayati Dolah, Mohd Taufik Pawanchek, Mahzom Bradley, David Andrew R Medicine We have conducted for the first time a Malaysian postal dosimetry audit of external beam under nonreference conditions by evaluating the output performance while screening for systematic errors within the dosimetry chain. The potential use from the choice of detector were investigated along with the search for other sources of discrepancies. Methods: Ten radiotherapy centres were audited, encompassing 16 megavoltage photon beam arrangements, adopting the IAEA postal dosimetry protocol for non-reference conditions, with a holder modified to accommodate three TLD types: Ge-doped cylindrical silica fibres (CF), Ge-doped flat silica fibres (FF), and TLD-100 powder. Results: Eight of the centres operated within +/- 5% of stated dose, one other exceeding tolerance for all measured points, and one did not return any dosimeters for analysis after failing the initial irradiations. Post remedial measures, the mean relative response for CF, FF, and TLD-100 was 1.00, 0.99, and 0.98 respectively, with associated coefficients of variation 6.87%, 6.45%, and 5.06%. Conclusion: High quality radiotherapy clinical practice postal dosimetry audits that are based on sensitive TLDs are seen to be particularly effective in identifying and resolving dose delivery discrepancies. Elsevier 2022-08 Article PeerReviewed Fadzil, Muhammad Safwan Ahmad and Noor, Noramaliza Mohd and Min, Ung Ngie and Abdullah, Norhayati and Dolah, Mohd Taufik and Pawanchek, Mahzom and Bradley, David Andrew (2022) Dosimetry audit for megavoltage photon beams applied in non-reference conditions. Physica Medica-European Journal of Medical Physics, 100. pp. 99-104. ISSN 1120-1797, DOI https://doi.org/10.1016/j.ejmp.2022.06.011 <https://doi.org/10.1016/j.ejmp.2022.06.011>. 10.1016/j.ejmp.2022.06.011
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic R Medicine
spellingShingle R Medicine
Fadzil, Muhammad Safwan Ahmad
Noor, Noramaliza Mohd
Min, Ung Ngie
Abdullah, Norhayati
Dolah, Mohd Taufik
Pawanchek, Mahzom
Bradley, David Andrew
Dosimetry audit for megavoltage photon beams applied in non-reference conditions
description We have conducted for the first time a Malaysian postal dosimetry audit of external beam under nonreference conditions by evaluating the output performance while screening for systematic errors within the dosimetry chain. The potential use from the choice of detector were investigated along with the search for other sources of discrepancies. Methods: Ten radiotherapy centres were audited, encompassing 16 megavoltage photon beam arrangements, adopting the IAEA postal dosimetry protocol for non-reference conditions, with a holder modified to accommodate three TLD types: Ge-doped cylindrical silica fibres (CF), Ge-doped flat silica fibres (FF), and TLD-100 powder. Results: Eight of the centres operated within +/- 5% of stated dose, one other exceeding tolerance for all measured points, and one did not return any dosimeters for analysis after failing the initial irradiations. Post remedial measures, the mean relative response for CF, FF, and TLD-100 was 1.00, 0.99, and 0.98 respectively, with associated coefficients of variation 6.87%, 6.45%, and 5.06%. Conclusion: High quality radiotherapy clinical practice postal dosimetry audits that are based on sensitive TLDs are seen to be particularly effective in identifying and resolving dose delivery discrepancies.
format Article
author Fadzil, Muhammad Safwan Ahmad
Noor, Noramaliza Mohd
Min, Ung Ngie
Abdullah, Norhayati
Dolah, Mohd Taufik
Pawanchek, Mahzom
Bradley, David Andrew
author_facet Fadzil, Muhammad Safwan Ahmad
Noor, Noramaliza Mohd
Min, Ung Ngie
Abdullah, Norhayati
Dolah, Mohd Taufik
Pawanchek, Mahzom
Bradley, David Andrew
author_sort Fadzil, Muhammad Safwan Ahmad
title Dosimetry audit for megavoltage photon beams applied in non-reference conditions
title_short Dosimetry audit for megavoltage photon beams applied in non-reference conditions
title_full Dosimetry audit for megavoltage photon beams applied in non-reference conditions
title_fullStr Dosimetry audit for megavoltage photon beams applied in non-reference conditions
title_full_unstemmed Dosimetry audit for megavoltage photon beams applied in non-reference conditions
title_sort dosimetry audit for megavoltage photon beams applied in non-reference conditions
publisher Elsevier
publishDate 2022
url http://eprints.um.edu.my/41434/
_version_ 1778161672108638208
score 13.211869

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