Dosimetry audit for megavoltage photon beams applied in non-reference conditions
Purpose : We have conducted for the first time a Malaysian postal dosimetry audit of external beam under non-reference 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 alo...
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2022
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oai:psasir.upm.edu.my:101009 http://psasir.upm.edu.my/id/eprint/101009/ Dosimetry audit for megavoltage photon beams applied in non-reference conditions Ahmad Fadzil, Muhammad Safwan Mohd Noor, Noramaliza Ung, Ngie Min Abdullah, Norhayati Dolah, Mohd Taufik Pawanchek, Mahzom Bradley, David Andrew Purpose : We have conducted for the first time a Malaysian postal dosimetry audit of external beam under non-reference 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 Ahmad Fadzil, Muhammad Safwan and Mohd Noor, Noramaliza and Ung, Ngie Min 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, 100. pp. 99-104. ISSN 1120-1797 https://www.sciencedirect.com/science/article/pii/S112017972202004X 10.1016/j.ejmp.2022.06.011 |
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Purpose : We have conducted for the first time a Malaysian postal dosimetry audit of external beam under non-reference 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 |
Ahmad Fadzil, Muhammad Safwan Mohd Noor, Noramaliza Ung, Ngie Min Abdullah, Norhayati Dolah, Mohd Taufik Pawanchek, Mahzom Bradley, David Andrew |
| spellingShingle |
Ahmad Fadzil, Muhammad Safwan Mohd Noor, Noramaliza Ung, Ngie Min Abdullah, Norhayati Dolah, Mohd Taufik Pawanchek, Mahzom Bradley, David Andrew Dosimetry audit for megavoltage photon beams applied in non-reference conditions |
| author_facet |
Ahmad Fadzil, Muhammad Safwan Mohd Noor, Noramaliza Ung, Ngie Min Abdullah, Norhayati Dolah, Mohd Taufik Pawanchek, Mahzom Bradley, David Andrew |
| author_sort |
Ahmad Fadzil, Muhammad Safwan |
| 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 |
| _version_ |
1819301240076500992 |
| score |
13.4562235 |