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• W16773048 abstract "The x-ray induced primary electrons inside the photoconductor of direct conversion digital flat panel mammographic detectors, comprise the primary signal which propagates in the material and forms the final signal (image). Consequently, the quality of the mammographic image strongly depends on the characteristics of primary electrons. An investigation is made concerning the primary signal formation and the characteristics of primary electrons inside a-Se, a-As2Se3, GaSe, GaAs, Ge, CdTe, CdZnTe, Cd0.8Zn0.2Te, ZnTe, PbO, TlBr, PbI2 and HgI2, which are suitable photoconductors for direct detectors. A Monte Carlo model has been developed that simulates the primary electron production inside the materials mentioned for various x-ray spectra in the mammographic energy range. The model simulates the photon interactions and the atomic deexcitations. Furthermore, particularly for a-Se, a preliminary study is made concerning the correlation between the characteristics of primary and final signal, solving Newton’s equations of electron drifting in vacuum under the influence of a simple electric field. For the same material, an algorithm that calculates the electric potential distribution inside the detector from an existing analytical solution has been developed as well as a primitive Monte Carlo model for electron interactions. The most important findings are: (i) the percentage of primary electrons being forwards ejected is approximately 60 % with the most probable polar angles ranging from 50o to 70o, (ii) the electrons prefer to be emitted at two lobes around azimuthal angles φ=0 and π, (iii) approximately 80% of primary electrons are produced at the point of x-ray incidence whereas their majority is produced within the first 300 μm from detector’s surface, (iv) the electron spatial distributions for a-Se, a-As2Se3, GaSe, GaAs, Ge, PbO and TlBr are almost spectral independent while for the rest of materials there is a spectral dependence, (v) at the practical mammographic energies (15-40 keV) and at the primitive stage of signal formation a-Se, a-As2Se3 and Ge have the minimum azimuthal uniformity in electron emission whereas CdZnTe, Cd0.8Zn0.2Te and CdTe the maximum one, a-Se has the best inherent spatial resolution but the minimum number of primary electrons, PbO has the minimum bulk space in which electrons can be produced (radius R=200 μm, depth Dmax=320 μm) whereas CdTe has the maximum one (R=500 μm, Dmax=660 μm), (vi) finally, there is strong evidence indicating that PbI2 and HgI2 could be the best choices for this kind of applications." @default.
• W16773048 created "2016-06-24" @default.
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• W16773048 date "2008-07-17" @default.
• W16773048 modified "2023-09-26" @default.
• W16773048 title "Development of a Monte Carlo simulation model of the signal formation processes inside photoconducting materials for active matrix flat panel direct detectors in digital mammography" @default.
• W16773048 hasPublicationYear "2008" @default.
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