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Title: A universal dose–response curve for radiochromic films

Abstract

Purpose: This paper presents a model for dose–response curves of radiochromic films. It is based on a modified version of single-hit model to take into account the growth experienced by lithium salt of pentacosa-10,12-diynoic acid polymers after irradiation. Methods: Polymer growth in radiochromic films is a critical phenomenon that can be properly described by means of percolation theory to provide an appropriate distribution function for polymer sizes. Resulting functional form is a power function featuring a critical exponent and two adjustable parameters. Moreover, these parameters act as scaling factors setting a natural scale for sensitometric curves where the dependence on channel sensitivity is removed. A unique reduced response curve is then obtained from all the color channels describing film behavior independently of film dosimetry system. Results: Resulting functional form has been successfully tested in several sensitometric curves from different Gafchromic EBT models, providing excellent agreement with experimental data in a wide dose range up to about 40 Gy and low dose uncertainty. Conclusions: The model presented in this paper describes accurately the sensitometric curves of radiochromic films in wide dose ranges covering all typical ranges used in external radiotherapy. Resulting dose uncertainty is low enough to render a reasonably goodmore » performance in clinical applications. Due to cross-correlation, only one of the adjustable parameters is totally independent and characterizes film batches.« less

Authors:
; ; ; ; ;  [1]
  1. Radiofísica Hospitalaria, Hospital Regional Universitario, Málaga 29010 (Spain)
Publication Date:
OSTI Identifier:
22413377
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 42; Journal Issue: 1; Other Information: (c) 2015 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; 60 APPLIED LIFE SCIENCES; FILM DOSIMETRY; PERFORMANCE; POLYMERS; RADIOTHERAPY

Citation Formats

Martín-Viera Cueto, J. A., E-mail: josea.martinviera.sspa@juntadeandalucia.es, Parra Osorio, V., Moreno Sáiz, C., Navarro Guirado, F., Casado Villalón, F. J., and Galán Montenegro, P. A universal dose–response curve for radiochromic films. United States: N. p., 2015. Web. doi:10.1118/1.4903301.
Martín-Viera Cueto, J. A., E-mail: josea.martinviera.sspa@juntadeandalucia.es, Parra Osorio, V., Moreno Sáiz, C., Navarro Guirado, F., Casado Villalón, F. J., & Galán Montenegro, P. A universal dose–response curve for radiochromic films. United States. doi:10.1118/1.4903301.
Martín-Viera Cueto, J. A., E-mail: josea.martinviera.sspa@juntadeandalucia.es, Parra Osorio, V., Moreno Sáiz, C., Navarro Guirado, F., Casado Villalón, F. J., and Galán Montenegro, P. Thu . "A universal dose–response curve for radiochromic films". United States. doi:10.1118/1.4903301.
@article{osti_22413377,
title = {A universal dose–response curve for radiochromic films},
author = {Martín-Viera Cueto, J. A., E-mail: josea.martinviera.sspa@juntadeandalucia.es and Parra Osorio, V. and Moreno Sáiz, C. and Navarro Guirado, F. and Casado Villalón, F. J. and Galán Montenegro, P.},
abstractNote = {Purpose: This paper presents a model for dose–response curves of radiochromic films. It is based on a modified version of single-hit model to take into account the growth experienced by lithium salt of pentacosa-10,12-diynoic acid polymers after irradiation. Methods: Polymer growth in radiochromic films is a critical phenomenon that can be properly described by means of percolation theory to provide an appropriate distribution function for polymer sizes. Resulting functional form is a power function featuring a critical exponent and two adjustable parameters. Moreover, these parameters act as scaling factors setting a natural scale for sensitometric curves where the dependence on channel sensitivity is removed. A unique reduced response curve is then obtained from all the color channels describing film behavior independently of film dosimetry system. Results: Resulting functional form has been successfully tested in several sensitometric curves from different Gafchromic EBT models, providing excellent agreement with experimental data in a wide dose range up to about 40 Gy and low dose uncertainty. Conclusions: The model presented in this paper describes accurately the sensitometric curves of radiochromic films in wide dose ranges covering all typical ranges used in external radiotherapy. Resulting dose uncertainty is low enough to render a reasonably good performance in clinical applications. Due to cross-correlation, only one of the adjustable parameters is totally independent and characterizes film batches.},
doi = {10.1118/1.4903301},
journal = {Medical Physics},
number = 1,
volume = 42,
place = {United States},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}