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Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation

This study aims to investigate the influence of the phantom position on weighted computed tomography dose index (CTDI(w)) in cone beam computed tomography (CBCT) when assuming breast irradiation. Computed tomography dose index (CTDI) was measured by the x‐ray volume imaging of CBCT using parameters...

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Autores principales: Ueno, Hiroyuki, Matsubara, Kosuke, Takemura, Akihiro, Hizume, Masato, Bou, Sayuri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8200449/
https://www.ncbi.nlm.nih.gov/pubmed/34048143
http://dx.doi.org/10.1002/acm2.13282
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author Ueno, Hiroyuki
Matsubara, Kosuke
Takemura, Akihiro
Hizume, Masato
Bou, Sayuri
author_facet Ueno, Hiroyuki
Matsubara, Kosuke
Takemura, Akihiro
Hizume, Masato
Bou, Sayuri
author_sort Ueno, Hiroyuki
collection PubMed
description This study aims to investigate the influence of the phantom position on weighted computed tomography dose index (CTDI(w)) in cone beam computed tomography (CBCT) when assuming breast irradiation. Computed tomography dose index (CTDI) was measured by the x‐ray volume imaging of CBCT using parameters for image‐guided radiation therapy (IGRT) in right breast irradiation. The measurement points of CTDI ranged from 0 (center) to 16 cm in the right–left (RL) direction, and from 0 (center) to 7.5 cm in the anterior–posterior (AP) direction, which assumed right breast irradiation. A nonuniform change exists in the relative value of CTDI(w) when the phantom deviated from the isocenter of CBCT. The CTDI(w) was ~30% lower compared with the value at the isocenter of CBCT when the phantom deviated 7.5 and 16 cm at the AP and RL directions, respectively. This study confirmed the influence of the phantom position on the CTDI values of CBCT. The CTDI measured at the isocenter of CBCT overestimates that measured at the irradiation center of the breast.
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spelling pubmed-82004492021-06-15 Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation Ueno, Hiroyuki Matsubara, Kosuke Takemura, Akihiro Hizume, Masato Bou, Sayuri J Appl Clin Med Phys Technical Notes This study aims to investigate the influence of the phantom position on weighted computed tomography dose index (CTDI(w)) in cone beam computed tomography (CBCT) when assuming breast irradiation. Computed tomography dose index (CTDI) was measured by the x‐ray volume imaging of CBCT using parameters for image‐guided radiation therapy (IGRT) in right breast irradiation. The measurement points of CTDI ranged from 0 (center) to 16 cm in the right–left (RL) direction, and from 0 (center) to 7.5 cm in the anterior–posterior (AP) direction, which assumed right breast irradiation. A nonuniform change exists in the relative value of CTDI(w) when the phantom deviated from the isocenter of CBCT. The CTDI(w) was ~30% lower compared with the value at the isocenter of CBCT when the phantom deviated 7.5 and 16 cm at the AP and RL directions, respectively. This study confirmed the influence of the phantom position on the CTDI values of CBCT. The CTDI measured at the isocenter of CBCT overestimates that measured at the irradiation center of the breast. John Wiley and Sons Inc. 2021-05-28 /pmc/articles/PMC8200449/ /pubmed/34048143 http://dx.doi.org/10.1002/acm2.13282 Text en © 2021 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of 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 Technical Notes
Ueno, Hiroyuki
Matsubara, Kosuke
Takemura, Akihiro
Hizume, Masato
Bou, Sayuri
Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title_full Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title_fullStr Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title_full_unstemmed Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title_short Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
title_sort evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
topic Technical Notes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8200449/
https://www.ncbi.nlm.nih.gov/pubmed/34048143
http://dx.doi.org/10.1002/acm2.13282
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