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Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film

The purpose of this study was to investigate the impact of scanning orientation and lateral response artifact (LRA) effects on the dose‐response of EBT4 films and compare it with that of EBT3 films. Dose‐response curves for EBT3 and EBT4 films in red‐green‐blue (RGB) color channels in portrait orien...

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Autores principales: Miura, Hideharu, Ozawa, Shuichi, Okazue, Toshiya, Enosaki, Tsubasa, Nagata, Yasushi
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/PMC10402671/
https://www.ncbi.nlm.nih.gov/pubmed/37086445
http://dx.doi.org/10.1002/acm2.13992
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author Miura, Hideharu
Ozawa, Shuichi
Okazue, Toshiya
Enosaki, Tsubasa
Nagata, Yasushi
author_facet Miura, Hideharu
Ozawa, Shuichi
Okazue, Toshiya
Enosaki, Tsubasa
Nagata, Yasushi
author_sort Miura, Hideharu
collection PubMed
description The purpose of this study was to investigate the impact of scanning orientation and lateral response artifact (LRA) effects on the dose‐response of EBT4 films and compare it with that of EBT3 films. Dose‐response curves for EBT3 and EBT4 films in red‐green‐blue (RGB) color channels in portrait orientation were created for unexposed films and for films exposed to doses ranging from 0 to 1 000 cGy. Portrait and landscape orientations of the EBT3 and EBT4 films were scanned to investigate the scanning orientation effect in the red channel. EBT3 and EBT4 films were irradiated to assess the LRA in the red channel using a field size of 15 × 15 cm(2) and delivered doses of 200, 400, and 600 cGy. Films were scanned at the edge of the scanner bed, and the measured doses were compared with the treatment planning system (TPS) calculated doses at a position 100 mm lateral to the scanner center. At a dose of 200 cGy, the differences in optical density (OD) in the red, green, and blue color channels between EBT3 and EBT4 films were 0.035 (24.8%), 0.042 (49.7%), and 0.022 (64.4%), respectively. The EBT4 film slightly improved the scanning orientation compared to the EBT3 film. The OD difference in the different scanning orientations for the EBT3 and EBT4 films was 0.015 (6.8%) and 0.007 (3.9%), respectively, at a dose of 200 cGy. This is equivalent to a 20 or 10 cGy variation at a dose of 200 cGy. Compared with the TPS calculation, the measurement doses for EBT3 and EBT4 films irradiated at 200 cGy were approximately 16% and 13% higher, respectively, at the 100 mm off‐centered position. The EBT4 film showed an improvement concerning the impact of LRA compared with the EBT3 film. This study demonstrated that the response of EBT4 film to a dose in the blue channel was less sensitive and showed an improvement in the scanning orientation and LRA effects.
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spelling pubmed-104026712023-08-05 Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film Miura, Hideharu Ozawa, Shuichi Okazue, Toshiya Enosaki, Tsubasa Nagata, Yasushi J Appl Clin Med Phys Radiation Oncology Physics The purpose of this study was to investigate the impact of scanning orientation and lateral response artifact (LRA) effects on the dose‐response of EBT4 films and compare it with that of EBT3 films. Dose‐response curves for EBT3 and EBT4 films in red‐green‐blue (RGB) color channels in portrait orientation were created for unexposed films and for films exposed to doses ranging from 0 to 1 000 cGy. Portrait and landscape orientations of the EBT3 and EBT4 films were scanned to investigate the scanning orientation effect in the red channel. EBT3 and EBT4 films were irradiated to assess the LRA in the red channel using a field size of 15 × 15 cm(2) and delivered doses of 200, 400, and 600 cGy. Films were scanned at the edge of the scanner bed, and the measured doses were compared with the treatment planning system (TPS) calculated doses at a position 100 mm lateral to the scanner center. At a dose of 200 cGy, the differences in optical density (OD) in the red, green, and blue color channels between EBT3 and EBT4 films were 0.035 (24.8%), 0.042 (49.7%), and 0.022 (64.4%), respectively. The EBT4 film slightly improved the scanning orientation compared to the EBT3 film. The OD difference in the different scanning orientations for the EBT3 and EBT4 films was 0.015 (6.8%) and 0.007 (3.9%), respectively, at a dose of 200 cGy. This is equivalent to a 20 or 10 cGy variation at a dose of 200 cGy. Compared with the TPS calculation, the measurement doses for EBT3 and EBT4 films irradiated at 200 cGy were approximately 16% and 13% higher, respectively, at the 100 mm off‐centered position. The EBT4 film showed an improvement concerning the impact of LRA compared with the EBT3 film. This study demonstrated that the response of EBT4 film to a dose in the blue channel was less sensitive and showed an improvement in the scanning orientation and LRA effects. John Wiley and Sons Inc. 2023-04-22 /pmc/articles/PMC10402671/ /pubmed/37086445 http://dx.doi.org/10.1002/acm2.13992 Text en © 2023 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, LLC on behalf of The American Association of Physicists in Medicine. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Radiation Oncology Physics
Miura, Hideharu
Ozawa, Shuichi
Okazue, Toshiya
Enosaki, Tsubasa
Nagata, Yasushi
Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title_full Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title_fullStr Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title_full_unstemmed Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title_short Characterization of scanning orientation and lateral response artifact for EBT4 Gafchromic film
title_sort characterization of scanning orientation and lateral response artifact for ebt4 gafchromic film
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10402671/
https://www.ncbi.nlm.nih.gov/pubmed/37086445
http://dx.doi.org/10.1002/acm2.13992
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