Krzysztof Chełmiński1, Wojciech Bulski1, Dietmar Georg2, Dominika Bodzak1, Zbigniew Maniakowski3, Dominika Oborska4, Joanna Rostkowska1, Małgorzata Kania1. 1. Department of Medical Physics, The Maria Skłodowska-Curie Memorial Cancer Centre and Institute of Oncology, ul. Roentgena 5, 02-781 Warsaw, Poland. 2. Division of Medical Radiation Physics, University of Vienna Medical School, Waehringer Guertel 18-20, A-1090 Vienna, Austria. 3. Department of Medical Physics, The Maria Skłodowska-Curie Memorial Cancer Centre and Institute of Oncology, Wybrzeże Armii Krajowej 15, 44-101 Gliwice, Poland. 4. Department of Medical Physics, Lower Silesian Oncology Centre, pl. Hirszfelda 12, 53-413 Wrocław, Poland.
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 Gy using photon beams from the energy range 1.25 MeV to 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 Gy. The relative difference exceeds 20% for doses lower than 1 Gy while for doses over 1 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 Gy.
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 Gy using photon beams from the energy range 1.25 MeV to 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 Gy. The relative difference exceeds 20% for doses lower than 1 Gy while for doses over 1 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 Gy.
Entities:
Keywords:
Film dosimetry; Quality assurance; Radiochromic films
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