open access

Vol 15, No 2 (2010)
Published online: 2010-03-01
Submitted: 2009-07-13
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Energy dependence of radiochromic dosimetry films for use in radiotherapy verification

Krzysztof Chełmiński, Wojciech Bulski, Dietmar Georg, Dominika Bodzak, Zbigniew Maniakowski, Dominika Oborska, Joanna Rostkowska, Małgorzata Kania
DOI: 10.1016/j.rpor.2010.02.003
·
Rep Pract Oncol Radiother 2010;15(2):40-46.

open access

Vol 15, No 2 (2010)
Published online: 2010-03-01
Submitted: 2009-07-13

Abstract

Aim

The purpose of the study was to examine the energy dependence of Gafchromic EBT radiochromic dosimetry films, in order to assess their potential use in intensity-modulated radiotherapy (IMRT) verifications.

Materials and methods

The film samples were irradiated with doses from 0.1 to 12[[ce:hsp sp="0.25"/]]Gy using photon beams from the energy range 1.25[[ce:hsp sp="0.25"/]]MeV to 25[[ce:hsp sp="0.25"/]]MV and the film response was measured using a flat-bed scanner. The samples were scanned and the film responses for different beam energies were compared.

Results

A high uncertainty in readout of the film response was observed for samples irradiated with doses lower than 1[[ce:hsp sp="0.25"/]]Gy. The relative difference exceeds 20% for doses lower than 1[[ce:hsp sp="0.25"/]]Gy while for doses over 1[[ce:hsp sp="0.25"/]]Gy the measured film response differs by less than 5% for the whole examined energy range. The achieved uncertainty of the experimental procedure does not reveal any energy dependence of Gafchromic EBT film response in the investigated energy range.

Conclusions

Gafchromic EBT film does not show any energy dependence in the conditions typical for IMRT but the doses measured for pre-treatment plan verifications should exceed 1[[ce:hsp sp="0.25"/]]Gy.

Abstract

Aim

The purpose of the study was to examine the energy dependence of Gafchromic EBT radiochromic dosimetry films, in order to assess their potential use in intensity-modulated radiotherapy (IMRT) verifications.

Materials and methods

The film samples were irradiated with doses from 0.1 to 12[[ce:hsp sp="0.25"/]]Gy using photon beams from the energy range 1.25[[ce:hsp sp="0.25"/]]MeV to 25[[ce:hsp sp="0.25"/]]MV and the film response was measured using a flat-bed scanner. The samples were scanned and the film responses for different beam energies were compared.

Results

A high uncertainty in readout of the film response was observed for samples irradiated with doses lower than 1[[ce:hsp sp="0.25"/]]Gy. The relative difference exceeds 20% for doses lower than 1[[ce:hsp sp="0.25"/]]Gy while for doses over 1[[ce:hsp sp="0.25"/]]Gy the measured film response differs by less than 5% for the whole examined energy range. The achieved uncertainty of the experimental procedure does not reveal any energy dependence of Gafchromic EBT film response in the investigated energy range.

Conclusions

Gafchromic EBT film does not show any energy dependence in the conditions typical for IMRT but the doses measured for pre-treatment plan verifications should exceed 1[[ce:hsp sp="0.25"/]]Gy.

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Keywords

Radiochromic films; Quality assurance; Film dosimetry

About this article
Title

Energy dependence of radiochromic dosimetry films for use in radiotherapy verification

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 15, No 2 (2010)

Pages

40-46

Published online

2010-03-01

DOI

10.1016/j.rpor.2010.02.003

Bibliographic record

Rep Pract Oncol Radiother 2010;15(2):40-46.

Keywords

Radiochromic films
Quality assurance
Film dosimetry

Authors

Krzysztof Chełmiński
Wojciech Bulski
Dietmar Georg
Dominika Bodzak
Zbigniew Maniakowski
Dominika Oborska
Joanna Rostkowska
Małgorzata Kania

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