Fading correction for calibration of a novel 2D OSL-film dosimeter: 2D OSL-film dosimeter

Marco Caprioli, Laurence Delombaerde, Marijke De Saint-Hubert, Luana de Freitas Nascimento, Shamil Samanta Galvez Febles, Brent van der Heyden, Dirk Vandenbroucke, Robin De Roover, Paul Leblans, Wouter Crijns

Research outputpeer-review

Abstract

A new film dosimeter based on optically stimulated luminescence (OSL) was calibrated for high-resolution 2D dosimetry in the context of radiotherapy patient-specific quality assurance (PSQA). The OSL-film signal is linear with the dose and decays with time, in a process called fading. Two models were proposed to characterize the fading: (1) a linear model independent from the delivery and of practical use thanks to the straightforward signal-to-dose conversion, and (2) a delivery-dependent model, to investigate whether a more simplified model may be sufficient to accurately determine the fading independently from the specific-irradiation conditions. The models were used in a nonlinear regression over an experimental dataset acquired with a 6MV photon beam in standard calibration settings. Both models were accurate and showed an adjusted-��2 of 0.98 (1) and 0.99 (2). The residual analysis on both models allowed to define the minimum scanning time to have a discrepancies between the models <1%. Under this condition the OSL fading can be assumed independent on the irradiation parameters. As a consequence, within these boundary conditions, the linear model can be used for the OSLfilm calibr
Original languageEnglish
Article number012029
Number of pages4
JournalJournal of Physics: Conference Series
Volume2630
DOIs
StateE-pub ahead of print - 13 Dec 2023

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