Cargando…
Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy
In this paper, we suggest a new method for verifying the motion of a binary multileaf collimator (MLC) in helical tomotherapy. For this we used a combination of a cylindrical scintillator and a general‐purpose camcorder. The camcorder records the light from the scintillator following photon irradiat...
Autores principales: | , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2012
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5716135/ https://www.ncbi.nlm.nih.gov/pubmed/22231222 http://dx.doi.org/10.1120/jacmp.v13i1.3700 |
_version_ | 1783283882918936576 |
---|---|
author | Hashimoto, Masatoshi Uematsu, Masahiro Ito, Makiko Hama, Yukihiro Inomata, Takayuki Fujii, Masahiro Nishio, Teiji Nakamura, Naoki Nakagawa, Keiichi |
author_facet | Hashimoto, Masatoshi Uematsu, Masahiro Ito, Makiko Hama, Yukihiro Inomata, Takayuki Fujii, Masahiro Nishio, Teiji Nakamura, Naoki Nakagawa, Keiichi |
author_sort | Hashimoto, Masatoshi |
collection | PubMed |
description | In this paper, we suggest a new method for verifying the motion of a binary multileaf collimator (MLC) in helical tomotherapy. For this we used a combination of a cylindrical scintillator and a general‐purpose camcorder. The camcorder records the light from the scintillator following photon irradiation, which we use to track the motion of the binary MLC. The purpose of this study is to demonstrate the feasibility of this method as a binary MLC quality assurance (QA) tool. First, the verification was performed using a simple binary MLC pattern with a constant leaf open time; secondly, verification using the binary MLC pattern used in a clinical setting was also performed. Sinograms of simple binary MLC patterns, in which leaves that were open were detected as “open” from the measured light, define the sensitivity which, in this case, was 1.000. On the other hand, the specificity, which gives the fraction of closed leaves detected as “closed”, was 0.919. The leaf open error identified by our method was [Formula: see text]. The 68.6% of observed leaves were performed within [Formula: see text] relative error. The leaf open error was expressed by the relative errors calculated on the sinogram. In the clinical binary MLC pattern, the sensitivity and specificity were 0.994 and 0.997, respectively. The measurement could be performed with [Formula: see text] leaf open error. The 77.5% of observed leaves were performed within [Formula: see text] relative error. With this method, we can easily verify the motion of the binary MLC, and the measurement unit developed was found to be an effective QA tool. PACS numbers: 87.56.Fc, 87.56.nk |
format | Online Article Text |
id | pubmed-5716135 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-57161352018-04-02 Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy Hashimoto, Masatoshi Uematsu, Masahiro Ito, Makiko Hama, Yukihiro Inomata, Takayuki Fujii, Masahiro Nishio, Teiji Nakamura, Naoki Nakagawa, Keiichi J Appl Clin Med Phys Radiation Oncology Physics In this paper, we suggest a new method for verifying the motion of a binary multileaf collimator (MLC) in helical tomotherapy. For this we used a combination of a cylindrical scintillator and a general‐purpose camcorder. The camcorder records the light from the scintillator following photon irradiation, which we use to track the motion of the binary MLC. The purpose of this study is to demonstrate the feasibility of this method as a binary MLC quality assurance (QA) tool. First, the verification was performed using a simple binary MLC pattern with a constant leaf open time; secondly, verification using the binary MLC pattern used in a clinical setting was also performed. Sinograms of simple binary MLC patterns, in which leaves that were open were detected as “open” from the measured light, define the sensitivity which, in this case, was 1.000. On the other hand, the specificity, which gives the fraction of closed leaves detected as “closed”, was 0.919. The leaf open error identified by our method was [Formula: see text]. The 68.6% of observed leaves were performed within [Formula: see text] relative error. The leaf open error was expressed by the relative errors calculated on the sinogram. In the clinical binary MLC pattern, the sensitivity and specificity were 0.994 and 0.997, respectively. The measurement could be performed with [Formula: see text] leaf open error. The 77.5% of observed leaves were performed within [Formula: see text] relative error. With this method, we can easily verify the motion of the binary MLC, and the measurement unit developed was found to be an effective QA tool. PACS numbers: 87.56.Fc, 87.56.nk John Wiley and Sons Inc. 2012-01-05 /pmc/articles/PMC5716135/ /pubmed/22231222 http://dx.doi.org/10.1120/jacmp.v13i1.3700 Text en © 2012 The Authors. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/3.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Radiation Oncology Physics Hashimoto, Masatoshi Uematsu, Masahiro Ito, Makiko Hama, Yukihiro Inomata, Takayuki Fujii, Masahiro Nishio, Teiji Nakamura, Naoki Nakagawa, Keiichi Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title | Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title_full | Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title_fullStr | Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title_full_unstemmed | Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title_short | Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
title_sort | investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy |
topic | Radiation Oncology Physics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5716135/ https://www.ncbi.nlm.nih.gov/pubmed/22231222 http://dx.doi.org/10.1120/jacmp.v13i1.3700 |
work_keys_str_mv | AT hashimotomasatoshi investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT uematsumasahiro investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT itomakiko investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT hamayukihiro investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT inomatatakayuki investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT fujiimasahiro investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT nishioteiji investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT nakamuranaoki investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy AT nakagawakeiichi investigationofthefeasibilityofasimplemethodforverifyingthemotionofabinarymultileafcollimatorsynchronizedwiththerotationofthegantryforhelicaltomotherapy |