title: Precise radiochromic film dosimetry using a flat-bed document scanner.
abstract: In this study, a measurement protocol is presented that improves the precision of dose measurements using a flat-bed document scanner in conjunction with two new GafChromic film models, HS and Prototype A EBT exposed to 6 MV photon beams. We established two sources of uncertainties in dose measurements, governed by measurement and calibration curve fit parameters contributions. We have quantitatively assessed the influence of different steps in the protocol on the overall dose measurement uncertainty. Applying the protocol described in this paper on the Agfa Arcus II flat-bed document scanner, the overall one-sigma dose measurement uncertainty for an uniform field amounts to 2% or less for doses above around 0.4 Gy in the case of the EBT (Prototype A), and for doses above 5 Gy in the case of the HS model GafChromic film using a region of interest 2 X 2 mm2 in size.
authors.affiliation: Medical Physics Department, McGill University Health Centre, Montréal, Québec H3G IA4, Canada. devic@medphys.mcgill.ca
authors.forename: Slobodan
authors.initials: S
authors.lastname: Devic
authors.forename: Jan
authors.initials: J
authors.lastname: Seuntjens
authors.forename: Edwin
authors.initials: E
authors.lastname: Sham
authors.forename: Ervin B
authors.initials: EB
authors.lastname: Podgorsak
authors.forename: C Ross
authors.initials: CR
authors.lastname: Schmidtlein
authors.forename: Assen S
authors.initials: AS
authors.lastname: Kirov
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Soares
mesh_terms: D000465:Algorithms; D016287:Computer Peripherals; D004307:Dose-Response Relationship, Radiation; D005373:Film Dosimetry / Q000295:instrumentation* / Q000379:methods*; D011829:Radiation Dosage