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Reference dosimetry using radiochromic film

The objectives of this study are to identify and quantify factors that influence radiochromic film dose response and to determine whether such films are suitable for reference dosimetry. The influence of several parameters that may introduce systematic dose errors when performing reference dose meas...

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Detalles Bibliográficos
Autores principales: Girard, Frédéric, Bouchard, Hugo, Lacroix, Frédéric
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/PMC5718535/
https://www.ncbi.nlm.nih.gov/pubmed/23149793
http://dx.doi.org/10.1120/jacmp.v13i6.3994
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author Girard, Frédéric
Bouchard, Hugo
Lacroix, Frédéric
author_facet Girard, Frédéric
Bouchard, Hugo
Lacroix, Frédéric
author_sort Girard, Frédéric
collection PubMed
description The objectives of this study are to identify and quantify factors that influence radiochromic film dose response and to determine whether such films are suitable for reference dosimetry. The influence of several parameters that may introduce systematic dose errors when performing reference dose measurements were investigated. The effect of the film storage temperature was determined by comparing the performance of three lots of GAFCHROMIC EBT2 films stored at either [Formula: see text] or room temperature. The effect of high [Formula: see text] or low ([Formula: see text]) relative humidity was also determined. Doses measured in optimal conditions with EBT and EBT2 films were then compared with an A12 ionization chamber measurement. Intensity‐modulated radiation therapy quality controls using EBT2 films were also performed in reference dose. The results obtained using reference dose measurements were compared with those obtained using relative dose measurements. Storing the film at [Formula: see text] improves the stability of the film over time, but does not eliminate the noncatalytic film development, seen as a rise in optical density over time in the absence of radiation. Relative humidity variations ranging from 80% to 20% have a strong impact on the optical density and could introduce dose errors of up to 15% if the humidity were not controlled during the film storage period. During the scanning procedure, the film temperature influences the optical density that is measured. When controlling for these three parameters, the dose differences between EBT or EBT2 and the A12 chamber are found to be within [Formula: see text] (2σ level) over a dose range of 20–350 cGy. Our results also demonstrate the limitation of the Anisotropic Analytical Algorithm for dose calculation of highly modulated treatment plans. PACS numbers: 87.55.Qr; 87.56.Fc
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spelling pubmed-57185352018-04-02 Reference dosimetry using radiochromic film Girard, Frédéric Bouchard, Hugo Lacroix, Frédéric J Appl Clin Med Phys Radiation Measurements The objectives of this study are to identify and quantify factors that influence radiochromic film dose response and to determine whether such films are suitable for reference dosimetry. The influence of several parameters that may introduce systematic dose errors when performing reference dose measurements were investigated. The effect of the film storage temperature was determined by comparing the performance of three lots of GAFCHROMIC EBT2 films stored at either [Formula: see text] or room temperature. The effect of high [Formula: see text] or low ([Formula: see text]) relative humidity was also determined. Doses measured in optimal conditions with EBT and EBT2 films were then compared with an A12 ionization chamber measurement. Intensity‐modulated radiation therapy quality controls using EBT2 films were also performed in reference dose. The results obtained using reference dose measurements were compared with those obtained using relative dose measurements. Storing the film at [Formula: see text] improves the stability of the film over time, but does not eliminate the noncatalytic film development, seen as a rise in optical density over time in the absence of radiation. Relative humidity variations ranging from 80% to 20% have a strong impact on the optical density and could introduce dose errors of up to 15% if the humidity were not controlled during the film storage period. During the scanning procedure, the film temperature influences the optical density that is measured. When controlling for these three parameters, the dose differences between EBT or EBT2 and the A12 chamber are found to be within [Formula: see text] (2σ level) over a dose range of 20–350 cGy. Our results also demonstrate the limitation of the Anisotropic Analytical Algorithm for dose calculation of highly modulated treatment plans. PACS numbers: 87.55.Qr; 87.56.Fc John Wiley and Sons Inc. 2012-11-08 /pmc/articles/PMC5718535/ /pubmed/23149793 http://dx.doi.org/10.1120/jacmp.v13i6.3994 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 Measurements
Girard, Frédéric
Bouchard, Hugo
Lacroix, Frédéric
Reference dosimetry using radiochromic film
title Reference dosimetry using radiochromic film
title_full Reference dosimetry using radiochromic film
title_fullStr Reference dosimetry using radiochromic film
title_full_unstemmed Reference dosimetry using radiochromic film
title_short Reference dosimetry using radiochromic film
title_sort reference dosimetry using radiochromic film
topic Radiation Measurements
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5718535/
https://www.ncbi.nlm.nih.gov/pubmed/23149793
http://dx.doi.org/10.1120/jacmp.v13i6.3994
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