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 6MV 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 0.4Gy in the case of the EBT (Prototype A), and for doses above 5Gy in the case of the HS model GafChromic® film using a region of interest 2×2mm2 in size.

Keywords: Absorption spectra; Ancillary equipment; Calibration; Charge coupled devices; Densitometers; Density measurement; Dosimetry; Dosimetry/exposure assessment; Error analysis; Image scanners; Photons; Transmission measurement; dosimetry; flat-bed scanner; radiation therapy; radiochromic film dosimetry; sensitivity curves; uncertainty analysis.