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- W2019711921 abstract "The Gafchromic™ EBT was recently introduced in film dosimetry for external beam therapy (EBT). The high spatial resolution, weak energy dependence, and near‐tissue equivalence of EBT films make them suitable for measurement of dose distributions in radiotherapy, especially intensity‐modulated radiation therapy (IMRT). Starting with a sensitometric curve and dose uncertainty relative to the flatbed scanner, the goal of this study was to find an efficient method of correcting for light scattering, and to compare dose distribution supplied by Gafchromic™ EBT with the distribution obtained with a 2D ion‐chamber detector system. Light scattering was analyzed for different levels of dose, and was found to depend on the red‐scale value as well as the position of the pixel on the scanner. Many “uniform” films were exposed at different levels of dose to create a two‐dimensional matrix correction to take this effect into account. The dose distribution obtained for three clinical beams ( , open fields and wedge field) were in agreement with those supplied by the 2D array. Gamma index (using distance and 5% dose as constraints) for the three fields considered was reached in an average of 98% of the points." @default.
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- W2019711921 date "2006-10-23" @default.
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- W2019711921 title "Clinical use of EBT model Gafchromic™ film in radiotherapy" @default.
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- W2019711921 doi "https://doi.org/10.1118/1.2362876" @default.
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