Cargando…

Quality assurance devices for dynamic conformal radiotherapy

Two quality control devices, a light‐field device and a radiation‐field device, have been specially designed to assist the clinical implementation of conformal dynamic arc treatment (CDAT) and intensity‐modulated radiation therapy (IMRT). With these devices, the light field as well as the radiation...

Descripción completa

Detalles Bibliográficos
Autor principal: Wong, Victy Y.W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2004
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5723447/
https://www.ncbi.nlm.nih.gov/pubmed/15753929
http://dx.doi.org/10.1120/jacmp.v5i1.1955
_version_ 1783285213533569024
author Wong, Victy Y.W.
author_facet Wong, Victy Y.W.
author_sort Wong, Victy Y.W.
collection PubMed
description Two quality control devices, a light‐field device and a radiation‐field device, have been specially designed to assist the clinical implementation of conformal dynamic arc treatment (CDAT) and intensity‐modulated radiation therapy (IMRT). With these devices, the light field as well as the radiation field projected from the individual beams at any treatment position (i.e., arbitrary gantry angle) can be evaluated. The devices are attached at the front end of the couch and placed at the isocenter of the linear accelerator treatment system (LINAC). The devices are designed to be able to rotate parallel to the gantry head so that the light field and the radiation field projected from a direct beam can be assessed. The aim of this study was to evaluate the geometric precision of the beam placement and the dosimetric accuracy performed in CDAT and IMRT with the aid of these devices. The devices are placed separately from the LINAC during use and provide an independent check on the quality performance of the LINAC in three dimensions. The condition of gantry sagging and any mechanical displacement resulting in field shift can be observed and traced during gantry rotation. Mistakes that occur during the isocenter calibration can lead to significant displacement in the field projection, which would not be revealed with the conventional quality control setting (i.e., gantry 0°). This was demonstrated with the aid of the two quality control devices in the study. The influence of gravitational acceleration in the multi‐leaf collimator (MLC) leaf positioning error, which would consequently lead to inaccurate dose delivery, was investigated. The results of our study show that the existence of a gravitational influence is statistically significant, although the magnitude of the dose inaccuracy is small. PACS numbers: 87.53.Kn, 87.56.Fc, 87.66.Cd
format Online
Article
Text
id pubmed-5723447
institution National Center for Biotechnology Information
language English
publishDate 2004
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-57234472018-04-02 Quality assurance devices for dynamic conformal radiotherapy Wong, Victy Y.W. J Appl Clin Med Phys Radiation Oncology Physics Two quality control devices, a light‐field device and a radiation‐field device, have been specially designed to assist the clinical implementation of conformal dynamic arc treatment (CDAT) and intensity‐modulated radiation therapy (IMRT). With these devices, the light field as well as the radiation field projected from the individual beams at any treatment position (i.e., arbitrary gantry angle) can be evaluated. The devices are attached at the front end of the couch and placed at the isocenter of the linear accelerator treatment system (LINAC). The devices are designed to be able to rotate parallel to the gantry head so that the light field and the radiation field projected from a direct beam can be assessed. The aim of this study was to evaluate the geometric precision of the beam placement and the dosimetric accuracy performed in CDAT and IMRT with the aid of these devices. The devices are placed separately from the LINAC during use and provide an independent check on the quality performance of the LINAC in three dimensions. The condition of gantry sagging and any mechanical displacement resulting in field shift can be observed and traced during gantry rotation. Mistakes that occur during the isocenter calibration can lead to significant displacement in the field projection, which would not be revealed with the conventional quality control setting (i.e., gantry 0°). This was demonstrated with the aid of the two quality control devices in the study. The influence of gravitational acceleration in the multi‐leaf collimator (MLC) leaf positioning error, which would consequently lead to inaccurate dose delivery, was investigated. The results of our study show that the existence of a gravitational influence is statistically significant, although the magnitude of the dose inaccuracy is small. PACS numbers: 87.53.Kn, 87.56.Fc, 87.66.Cd John Wiley and Sons Inc. 2004-05-25 /pmc/articles/PMC5723447/ /pubmed/15753929 http://dx.doi.org/10.1120/jacmp.v5i1.1955 Text en © 2004 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
Wong, Victy Y.W.
Quality assurance devices for dynamic conformal radiotherapy
title Quality assurance devices for dynamic conformal radiotherapy
title_full Quality assurance devices for dynamic conformal radiotherapy
title_fullStr Quality assurance devices for dynamic conformal radiotherapy
title_full_unstemmed Quality assurance devices for dynamic conformal radiotherapy
title_short Quality assurance devices for dynamic conformal radiotherapy
title_sort quality assurance devices for dynamic conformal radiotherapy
topic Radiation Oncology Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5723447/
https://www.ncbi.nlm.nih.gov/pubmed/15753929
http://dx.doi.org/10.1120/jacmp.v5i1.1955
work_keys_str_mv AT wongvictyyw qualityassurancedevicesfordynamicconformalradiotherapy