A method of increasing the film intrinsic robustness of radiochromic film dosimetry

The radiochromic film, which is used, in combination with a flatbed scanner has become a widely used tool for a quantitative evaluation of radiation dose in radiation therapy. One aspect of uncertainty using the radiochromic film is the magnitude of orientation effects when the orientation of the fi...

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Bibliographic Details
Published in:Physics in medicine & biology 2012-11, Vol.57 (22), p.N445-N456
Main Authors: Ebongue, A Ngwa, Srivastava, R P, Kwato Njock, M G, De Wagter, C
Format: Article
Language:English
Subjects:
Film Dosimetry - instrumentation
Film Dosimetry - methods
lateral correction
orientation effects
radiochromic film
sensitivity
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Summary:The radiochromic film, which is used, in combination with a flatbed scanner has become a widely used tool for a quantitative evaluation of radiation dose in radiation therapy. One aspect of uncertainty using the radiochromic film is the magnitude of orientation effects when the orientation of the film is not kept constant during the digitization process. The aim of this note was to investigate the impact of using a combination of two crossed sheets of EBT2 film on various aspects of radiochromic film dosimetry. First the impact on the film sensitivity was studied. We also investigated the influence on orientation effects during scanning. The results show that the double crossed film combination increases the sensitivity with a factor 1.7-2.1 and practically eliminates the effects of film orientation on the optical density read-out and the lateral correction profiles.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/57/22/N445