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Precise radiochromic film dosimetry using a flat‐bed document scanner
Author(s) -
Devic Slobodan,
Seuntjens Jan,
Sham Edwin,
Podgorsak Ervin B.,
Schmidtlein C. Ross,
Kirov Assen S.,
Soares Christopher G.
Publication year - 2005
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 - 10.1118/1.1929253
Subject(s) - dosimetry , scanner , medical physics , medical imaging , nuclear medicine , optics , materials science , computer science , physics , medicine , artificial intelligence
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 × 2mm 2in size.