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Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy

This study reports the commissioning methodology and results of a respiratory gating system [AZ – 733 V/733 VI (Anzai Medical Co., Japan)] using a pressure sensor in carbon‐ion scanning radiotherapy. Commissioning includes choosing a location and method for pressure sensor installation, delay time m...

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Autores principales: Mizuno, Hideyuki, Saito, Osami, Tajiri, Minoru, Kimura, Taku, Kuroiwa, Daigo, Shirai, Toshiyuki, Inaniwa, Taku, Fukahori, Mai, Miki, Kentaro, Fukuda, Shigekazu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333131/
https://www.ncbi.nlm.nih.gov/pubmed/30387271
http://dx.doi.org/10.1002/acm2.12463
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author Mizuno, Hideyuki
Saito, Osami
Tajiri, Minoru
Kimura, Taku
Kuroiwa, Daigo
Shirai, Toshiyuki
Inaniwa, Taku
Fukahori, Mai
Miki, Kentaro
Fukuda, Shigekazu
author_facet Mizuno, Hideyuki
Saito, Osami
Tajiri, Minoru
Kimura, Taku
Kuroiwa, Daigo
Shirai, Toshiyuki
Inaniwa, Taku
Fukahori, Mai
Miki, Kentaro
Fukuda, Shigekazu
author_sort Mizuno, Hideyuki
collection PubMed
description This study reports the commissioning methodology and results of a respiratory gating system [AZ – 733 V/733 VI (Anzai Medical Co., Japan)] using a pressure sensor in carbon‐ion scanning radiotherapy. Commissioning includes choosing a location and method for pressure sensor installation, delay time measurement of the system, and the final flow test. Additionally, we proposed a methodology for the determination of a threshold level of generating an on/off gate for the beam to the respiratory waveform, which is important for clinical application. Regarding the location and method for installation of the pressure sensor, the actual person's abdomen, back of the body position, and supine/prone positioning were checked. By comparing the motion between the pressure sensor output and the reference LED sensor motion, the chest rear surface was shown to be unsuitable for the sensor installation, due to noise in the signal caused by the cardiac beat. Regarding delay time measurement of the system, measurements were performed for the following four steps: (a). Actual motion to wave signal generation; (b). Wave signal to gate signal generation; (c). Gate signal to beam on/off signal generation; (d). Beam on/off signal to the beam irradiation. The total delay time measured was 46 ms (beam on)/33 ms (beam off); these were within the prescribed tolerance time (<100 ms). Regarding the final flow test, an end‐to‐end test was performed with a patient verification system using an actual carbon‐ion beam; the respiratory gating irradiation was successfully performed, in accordance with the intended timing. Finally, regarding the method for determining the threshold level of the gate generation of the respiration waveform, the target motion obtained from 4D‐CT was assumed to be correlated with the waveform obtained from the pressure sensor; it was used to determine the threshold value in amplitude direction.
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spelling pubmed-63331312019-01-23 Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy Mizuno, Hideyuki Saito, Osami Tajiri, Minoru Kimura, Taku Kuroiwa, Daigo Shirai, Toshiyuki Inaniwa, Taku Fukahori, Mai Miki, Kentaro Fukuda, Shigekazu J Appl Clin Med Phys Radiation Oncology Physics This study reports the commissioning methodology and results of a respiratory gating system [AZ – 733 V/733 VI (Anzai Medical Co., Japan)] using a pressure sensor in carbon‐ion scanning radiotherapy. Commissioning includes choosing a location and method for pressure sensor installation, delay time measurement of the system, and the final flow test. Additionally, we proposed a methodology for the determination of a threshold level of generating an on/off gate for the beam to the respiratory waveform, which is important for clinical application. Regarding the location and method for installation of the pressure sensor, the actual person's abdomen, back of the body position, and supine/prone positioning were checked. By comparing the motion between the pressure sensor output and the reference LED sensor motion, the chest rear surface was shown to be unsuitable for the sensor installation, due to noise in the signal caused by the cardiac beat. Regarding delay time measurement of the system, measurements were performed for the following four steps: (a). Actual motion to wave signal generation; (b). Wave signal to gate signal generation; (c). Gate signal to beam on/off signal generation; (d). Beam on/off signal to the beam irradiation. The total delay time measured was 46 ms (beam on)/33 ms (beam off); these were within the prescribed tolerance time (<100 ms). Regarding the final flow test, an end‐to‐end test was performed with a patient verification system using an actual carbon‐ion beam; the respiratory gating irradiation was successfully performed, in accordance with the intended timing. Finally, regarding the method for determining the threshold level of the gate generation of the respiration waveform, the target motion obtained from 4D‐CT was assumed to be correlated with the waveform obtained from the pressure sensor; it was used to determine the threshold value in amplitude direction. John Wiley and Sons Inc. 2018-11-01 /pmc/articles/PMC6333131/ /pubmed/30387271 http://dx.doi.org/10.1002/acm2.12463 Text en © 2018 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine. This is an open access article under the terms of the http://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
Mizuno, Hideyuki
Saito, Osami
Tajiri, Minoru
Kimura, Taku
Kuroiwa, Daigo
Shirai, Toshiyuki
Inaniwa, Taku
Fukahori, Mai
Miki, Kentaro
Fukuda, Shigekazu
Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title_full Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title_fullStr Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title_full_unstemmed Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title_short Commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
title_sort commissioning of a respiratory gating system involving a pressure sensor in carbon‐ion scanning radiotherapy
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333131/
https://www.ncbi.nlm.nih.gov/pubmed/30387271
http://dx.doi.org/10.1002/acm2.12463
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