EXPERIMENTAL EVALUATION OF DOSIMETRIC CHARACTERIZATION OF GAFCHROMIC EBT3 AND EBT-XD FILMS FOR CLINICAL CARBON ION BEAMS

Radiochromic film is a very useful tool for 2D dosimetric measurements in radiotherapy because it is self-developing and has very high-spatial resolution. However, considerable care has to be taken in ion beam radiotherapy owing to the quenching effect of high-linear energy transfer (LET) radiation....

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Bibliographic Details
Published in:Radiation protection dosimetry 2018-08, Vol.180 (1-4), p.314-318
Main Authors: Yonai, Shunsuke, Arai, Chinatsu, Shimoyama, Kaoru, Fournier-Bidoz, Nathalie
Format: Article
Language:English
Subjects:
Carbon - therapeutic use
Dose-Response Relationship, Radiation
Film Dosimetry - instrumentation
Film Dosimetry - methods
Humans
Linear Energy Transfer
Phantoms, Imaging
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Summary:Radiochromic film is a very useful tool for 2D dosimetric measurements in radiotherapy because it is self-developing and has very high-spatial resolution. However, considerable care has to be taken in ion beam radiotherapy owing to the quenching effect of high-linear energy transfer (LET) radiation. In this study, the dose responses of GAFchromic EBT3 and EBT-XD films were experimentally investigated using the clinical carbon ion beam at the Heavy Ion Medical Accelerator in Chiba. Results showed that the relations between absorbed dose and net optical density could be expressed well using an equation proposed by Reinhardt (2015). The quenching effect was evaluated by determining their relative efficiencies for photon irradiation as a function of LET. A correction equation derived in this study allowed the absorbed dose to be determined in the small irradiation field used for carbon ion radiotherapy eye treatments. This study contributes to establishing an absolute dosimetry procedure for heavy ion beams using radiochromic film.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncy006