title: Optimizing the dynamic range extension of a radiochromic film dosimetry system.
abstract: 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.
authors.affiliation: Medical Physics Department, McGill University Health Centre, Montréal, Québec H3G 1A4, Canada. devic@medphys.mcgill.ca
authors.forename: Slobodan
authors.initials: S
authors.lastname: Devic
authors.forename: Nada
authors.initials: N
authors.lastname: Tomic
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Soares
authors.forename: Ervin B
authors.initials: EB
authors.lastname: Podgorsak
mesh_terms: D003116:Color; D004307:Dose-Response Relationship, Radiation; D005373:Film Dosimetry / Q000379:methods*; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D035501:Uncertainty