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- W4308683418 abstract "Optically stimulated luminescence (OSL) dosimeters produce a signal linear to the dose, which fades with time due to the spontaneous recombination of energetically unstable electron/hole traps. When used for radiotherapy (RT) applications, fading affects the signal-to-dose conversion and causes an error in the final dose measurement. Moreover, the signal fading depends to some extent on treatment-specific irradiation conditions such as irradiation times.In this work, a dose calibration function for a novel OSL film dosimeter was derived accounting for signal fading. The proposed calibration allows to perform dosimetry evaluation for different RT treatment regimes.A novel BaFBr:Eu2+ -based OSL film (Zeff, 6 MV = 4.7) was irradiated on a TrueBeam STx using a 6 MV beam with setup: 0° gantry angle, 90 cm SSD, 10 cm depth, 10 × 10 cm2 field. A total of 86 measurements were acquired for dose-rates ( Ḋ$dot{D}$ ) of 600, 300, and 200 MU/min for irradiation times (tir ) of 0.2, 1, 2, 4.5, 12, and 23 min and various readout times (tscan ) between 4 and 1440 min from the start of the exposure (beam-on time). The OSL signal, S(Ḋ,tir,tscan)$S(dot{D},{t}_{ir},{t}_{scan})$ , was modeled via robust nonlinear regression, and two different power-law fading models were tested, respectively, independent (linear model) and dependent on the specific tir${t}_{ir}$ (delivery-dependent model).After 1 day from the exposure, the error on the dose measurement can be as high as 48% if a fading correction is not considered. The fading contribution was characterized by two accurate models with adjusted-R2 of 0.99. The difference between the two models is <4.75% for all tir${t}_{ir}$ and tscan${t}_{scan}$ . For different beam-on times, 3, 10.5, and 20 min, the optimum tscan${t}_{scan}$ was calculated in order to achieve a signal-to-dose conversion with a model-related error <1%. In the case of a 3 min irradiation, this condition is already met when the OSL-film is scanned immediately after the end of the irradiation. For an irradiation of 10.5 and 20 min, the minimum scanning time to achieve this model-related error increases, respectively, to 30 and 90 min. Under these conditions, the linear model can be used for the signal-to-dose conversion as an approximation of the delivery-dependent model. The signal-to-dose function, D(Mi,j , tscan$ {t}_{scan}$ ), has a residual mean error of 0.016, which gives a residual dose uncertainty of 0.5 mGy in the region of steep signal fading (i.e., tscan${t}_{scan} $ = 4 min). The function of two variables is representable as a dose surface depending on the signal (Mi,j ) measured for each i,j-pixel and the time of scan ( tscan${t}_{scan}$ ).The calibration of a novel OSL-film usable for dosimetry in different RT treatments was corrected for its signal fading with two different models. A linear calibration model independent from the treatment-specific irradiation condition results in a model-related error <1% if a proper scanning time is used for each irradiation length. This model is more practical than the delivery-dependent model because it does not need a pixel-to-pixel fading correction for different tir${t}_{ir}$ ." @default.
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- W4308683418 date "2022-11-29" @default.
- W4308683418 modified "2023-10-06" @default.
- W4308683418 title "Calibration and time fading characterization of a new <i>optically</i> stimulated luminescence film dosimeter" @default.
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- W4308683418 doi "https://doi.org/10.1002/mp.16076" @default.
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