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Title: A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films

Abstract

The use of small field sizes is increasingly becoming important in radiotherapy particularly since the introduction of stereotactic radiosurgery and intensity-modulated radiation therapy techniques. The reliable measurement of delivered dose from such fields with conventional dosimeters, such as ionization chambers, is a challenging task. In this work, methacrylic and ascorbic acid in gelatin initiated by copper polymer gel dosimeters are employed to measure dose in 3 dimensions. Field sizes of 5 × 5 mm{sup 2}, 10 × 10 mm{sup 2}, 20 × 20 mm{sup 2}, and 30 × 30 mm{sup 2} are investigated for a 6-MV x-rays. The results show an agreement with Gafchromic film, with some variation in measured doses near the edge of the fields, where the film data decrease more rapidly than the other methods. Dose penumbra widths obtained with gel dosimeters and Gafchormic film were generally in agreement with each other. The results of this work indicate that polymer gel dosimetry could be invaluable for the quantification of the 3-dimensional dose distribution in small field size.

Authors:
 [1];  [2];  [1]
  1. Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of)
  2. Department of Medical Physics, Shahid Beheshti university of Medical Sciences, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22267978
Resource Type:
Journal Article
Journal Name:
Medical Dosimetry
Additional Journal Information:
Journal Volume: 39; Journal Issue: 1; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0958-3947
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; ASCORBIC ACID; COPPER; DOSEMETERS; FILM DOSIMETRY; GELATIN; POLYMER GEL DOSIMETRY; POLYMERS; RADIATION DOSE DISTRIBUTIONS; RADIATION DOSES; RADIOTHERAPY; SURGERY

Citation Formats

Hassani, Hossein, Nedaie, Hassan Ali, E-mail: Nedaieha@sina.tums.ac.ir, Zahmatkesh, Mohammad Hassan, and Shirani, Kaveh. A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films. United States: N. p., 2014. Web. doi:10.1016/J.MEDDOS.2013.10.007.
Hassani, Hossein, Nedaie, Hassan Ali, E-mail: Nedaieha@sina.tums.ac.ir, Zahmatkesh, Mohammad Hassan, & Shirani, Kaveh. A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films. United States. https://doi.org/10.1016/J.MEDDOS.2013.10.007
Hassani, Hossein, Nedaie, Hassan Ali, E-mail: Nedaieha@sina.tums.ac.ir, Zahmatkesh, Mohammad Hassan, and Shirani, Kaveh. 2014. "A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films". United States. https://doi.org/10.1016/J.MEDDOS.2013.10.007.
@article{osti_22267978,
title = {A dosimetric study of small photon fields using polymer gel and Gafchromic EBT films},
author = {Hassani, Hossein and Nedaie, Hassan Ali, E-mail: Nedaieha@sina.tums.ac.ir and Zahmatkesh, Mohammad Hassan and Shirani, Kaveh},
abstractNote = {The use of small field sizes is increasingly becoming important in radiotherapy particularly since the introduction of stereotactic radiosurgery and intensity-modulated radiation therapy techniques. The reliable measurement of delivered dose from such fields with conventional dosimeters, such as ionization chambers, is a challenging task. In this work, methacrylic and ascorbic acid in gelatin initiated by copper polymer gel dosimeters are employed to measure dose in 3 dimensions. Field sizes of 5 × 5 mm{sup 2}, 10 × 10 mm{sup 2}, 20 × 20 mm{sup 2}, and 30 × 30 mm{sup 2} are investigated for a 6-MV x-rays. The results show an agreement with Gafchromic film, with some variation in measured doses near the edge of the fields, where the film data decrease more rapidly than the other methods. Dose penumbra widths obtained with gel dosimeters and Gafchormic film were generally in agreement with each other. The results of this work indicate that polymer gel dosimetry could be invaluable for the quantification of the 3-dimensional dose distribution in small field size.},
doi = {10.1016/J.MEDDOS.2013.10.007},
url = {https://www.osti.gov/biblio/22267978}, journal = {Medical Dosimetry},
issn = {0958-3947},
number = 1,
volume = 39,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}
}