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Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy

INTRODUCTION: Despite the development of DOSIRIS™, an eye lens dosimeter, the characteristics of DOSIRIS™ in the area of radiotherapy have not been investigated. The purpose of this study was to evaluate the basic characteristics of the 3‐mm dose equivalent measuring instrument DOSIRIS™ in radiother...

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Autores principales: Mori, Yutaro, Isobe, Tomonori, Takei, Hideyuki, Miyazaki, Shohei, Kamizawa, Satoshi, Tomita, Tetsuya, Kobayashi, Daisuke, Sakurai, Hideyuki, Sakae, Takeji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10258639/
https://www.ncbi.nlm.nih.gov/pubmed/36811316
http://dx.doi.org/10.1002/jmrs.653
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author Mori, Yutaro
Isobe, Tomonori
Takei, Hideyuki
Miyazaki, Shohei
Kamizawa, Satoshi
Tomita, Tetsuya
Kobayashi, Daisuke
Sakurai, Hideyuki
Sakae, Takeji
author_facet Mori, Yutaro
Isobe, Tomonori
Takei, Hideyuki
Miyazaki, Shohei
Kamizawa, Satoshi
Tomita, Tetsuya
Kobayashi, Daisuke
Sakurai, Hideyuki
Sakae, Takeji
author_sort Mori, Yutaro
collection PubMed
description INTRODUCTION: Despite the development of DOSIRIS™, an eye lens dosimeter, the characteristics of DOSIRIS™ in the area of radiotherapy have not been investigated. The purpose of this study was to evaluate the basic characteristics of the 3‐mm dose equivalent measuring instrument DOSIRIS™ in radiotherapy. METHODS: Dose linearity and energy dependence were evaluated for the irradiation system based on the calibration method of the monitor dosimeter. The angle dependence was measured by irradiating from a total of 18 directions. Interdevice variation was repeated three times by simultaneously irradiating five dosimeters. The measurement accuracy was based on the absorbed dose measured by the monitor dosimeter of the radiotherapy equipment. Absorbed doses were converted to 3‐mm dose equivalents and compared with DOSIRIS™ measurements. RESULTS: Dose linearity was evaluated using the determination coefficient (R (2)) R (2) = 0.9998 and 0.9996 at 6 and 10 MV, respectively. For energy dependence, although the therapeutic photons evaluated in this study had higher energies than in the previous studies and had a continuous spectrum, the response was equivalent to 0.2–1.25 MeV, well below the IEC 62387 limits. The maximum error at all angles was 15% (angle of 140°) and the coefficient of variation at all angles was 4.70%, which satisfies the standard of the thermoluminescent dosimeter measuring instrument. Accuracy of measurement was determined in terms of the measurement errors for DOSIRIS™ (3.2% and 4.3% at 6 and 10 MV, respectively,) using the 3‐mm dose equivalent obtained from the theoretical value as a reference. The DOSIRIS™ measurements met the IEC standard which defines the measurement error of ±30% of the irradiance value in IEC 62387. CONCLUSIONS: We found that the characteristics of the 3‐mm dose equivalent dosimeter in a high‐energy radiation satisfy the IEC standards and have the same measurement accuracy as diagnostic areas such as Interventional Radiology.
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spelling pubmed-102586392023-06-13 Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy Mori, Yutaro Isobe, Tomonori Takei, Hideyuki Miyazaki, Shohei Kamizawa, Satoshi Tomita, Tetsuya Kobayashi, Daisuke Sakurai, Hideyuki Sakae, Takeji J Med Radiat Sci Original Articles INTRODUCTION: Despite the development of DOSIRIS™, an eye lens dosimeter, the characteristics of DOSIRIS™ in the area of radiotherapy have not been investigated. The purpose of this study was to evaluate the basic characteristics of the 3‐mm dose equivalent measuring instrument DOSIRIS™ in radiotherapy. METHODS: Dose linearity and energy dependence were evaluated for the irradiation system based on the calibration method of the monitor dosimeter. The angle dependence was measured by irradiating from a total of 18 directions. Interdevice variation was repeated three times by simultaneously irradiating five dosimeters. The measurement accuracy was based on the absorbed dose measured by the monitor dosimeter of the radiotherapy equipment. Absorbed doses were converted to 3‐mm dose equivalents and compared with DOSIRIS™ measurements. RESULTS: Dose linearity was evaluated using the determination coefficient (R (2)) R (2) = 0.9998 and 0.9996 at 6 and 10 MV, respectively. For energy dependence, although the therapeutic photons evaluated in this study had higher energies than in the previous studies and had a continuous spectrum, the response was equivalent to 0.2–1.25 MeV, well below the IEC 62387 limits. The maximum error at all angles was 15% (angle of 140°) and the coefficient of variation at all angles was 4.70%, which satisfies the standard of the thermoluminescent dosimeter measuring instrument. Accuracy of measurement was determined in terms of the measurement errors for DOSIRIS™ (3.2% and 4.3% at 6 and 10 MV, respectively,) using the 3‐mm dose equivalent obtained from the theoretical value as a reference. The DOSIRIS™ measurements met the IEC standard which defines the measurement error of ±30% of the irradiance value in IEC 62387. CONCLUSIONS: We found that the characteristics of the 3‐mm dose equivalent dosimeter in a high‐energy radiation satisfy the IEC standards and have the same measurement accuracy as diagnostic areas such as Interventional Radiology. John Wiley and Sons Inc. 2023-02-21 2023-06 /pmc/articles/PMC10258639/ /pubmed/36811316 http://dx.doi.org/10.1002/jmrs.653 Text en © 2023 The Authors. Journal of Medical Radiation Sciences published by John Wiley & Sons Australia, Ltd on behalf of Australian Society of Medical Imaging and Radiation Therapy and New Zealand Institute of Medical Radiation Technology. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Original Articles
Mori, Yutaro
Isobe, Tomonori
Takei, Hideyuki
Miyazaki, Shohei
Kamizawa, Satoshi
Tomita, Tetsuya
Kobayashi, Daisuke
Sakurai, Hideyuki
Sakae, Takeji
Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title_full Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title_fullStr Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title_full_unstemmed Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title_short Evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
title_sort evaluation of basic characteristics of 3‐mm dose equivalent measuring instrument for evaluating lens exposure dose in radiotherapy
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10258639/
https://www.ncbi.nlm.nih.gov/pubmed/36811316
http://dx.doi.org/10.1002/jmrs.653
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