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- W2079793788 abstract "Three variants of the Schiff equation are investigated to model the spectra produced by megavoltage linear accelerators. These models are tested against well-validated Monte Carlo (MC) generated spectra on the central axis of large-area fields, and show excellent agreement. Numerical reconstructions of 6 and 10 MV spectra using the same models are then presented, using experimental attenuation data derived from an electronic portal imager. The process of deriving spectra from experimental attenuation data is shown to be inherently badly constrained mathematically, with the derived spectrum being highly sensitive to noise in the source data, and non-unique. By placing a priori constraints on the Schiff model from both physical knowledge of the construction of the accelerator and MC data, physically useful results are gained and presented for both the energy dependence and off-axis behaviour of photon spectra." @default.
- W2079793788 created "2016-06-24" @default.
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- W2079793788 date "2000-09-21" @default.
- W2079793788 modified "2023-09-25" @default.
- W2079793788 title "Reconstruction of megavoltage photon spectra from electronic portal imager derived transmission measurements" @default.
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- W2079793788 doi "https://doi.org/10.1088/0031-9155/45/10/401" @default.
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