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Optimizing the dynamic range extension of a radiochromic film dosimetry system
Author(s) -
Devic Slobodan,
Tomic Nada,
Soares Christopher G.,
Podgorsak Ervin B.
Publication year - 2009
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3049597
Subject(s) - dosimetry , channel (broadcasting) , optics , scanner , materials science , dynamic range , physics , nuclear medicine , computer science , telecommunications , medicine
The authors present a radiochromic film dosimetry protocol for a multicolor channel radiochromic film dosimetry system consisting of the external beam therapy (EBT) model GAFCHROMIC™ film and the Epson Expression 1680 flat‐bed document scanner. Instead of extracting only the red color channel, the authors are using all three color channels in the absorption spectrum of the EBT film to extend the dynamic dose range of the radiochromic film dosimetry system. By optimizing the dose range for each color channel, they obtained a system that has both precision and accuracy below 1.5%, and the optimized ranges are 0 – 4 Gy for the red channel, 4 – 50 Gy for the green channel, and above 50 Gy for the blue channel.