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- W2040781704 abstract "Various forms of Gafchromic films that are increasingly used for dosimetry in radiotherapy offer the prospect of reproducible and accurate high-resolution two-dimensional dose measurements, but there are many unresolved issues regarding the optimal choice of densitometric procedure used for the film's optical density (OD) readout. There are conflicting requirements for scanners (sensitivity, availability, price) and commercial document scanners appears to be a reasonable option, hence we analyzed the measured sublinear dose response of these scanners. Using measured film absorption spectra we were able to make quantitative distinction between various factors affecting the sublinearity and to demonstrate that the dose response curve can be predicted for any selected light source used for scanning. We also used the commercial narrow bandpass filters in conjunction with document scanners to investigate whether such an inexpensive option can improve their sensitivity, but results were not encouraging. Finally, we analyzed the suitability of proposed fitting equations for the calibration of the dose response and found that their reliability largely depends on the dose range used for the calibration." @default.
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- W2040781704 date "2011-03-01" @default.
- W2040781704 modified "2023-09-29" @default.
- W2040781704 title "Dosimetry using HS GafChromic films the influence of readout light on sensitivity of dosimetry" @default.
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- W2040781704 doi "https://doi.org/10.1016/j.nima.2010.12.234" @default.
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