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• W2123535172 abstract "Active matrix, flat-panel x-ray imagers based on a-Si:H thin-film transistors offer many advantages and are widely utilized in medical imaging applications. Unfortunately, the detective quantum efficiency (DQE) of conventional flat-panel imagers incorporating scintillators or a-Se photoconductors is significantly limited by their relatively modest signal-to-noise ratio, particularly in applications involving low x-ray exposures or high spatial resolution. For this reason, polycrystalline HgI2 is of considerable interest by virtue of its low effective work function, high atomic number and the possibility of large-area deposition. In this study, a detailed investigation of the properties of prototype, flat-panel arrays coated with two forms of this high-gain photoconductor are reported. Encouragingly, high x-ray sensitivity, low dark current and spatial resolution close to the theoretical limits were observed from a number of prototypes. In addition, input-quantum-limited DQE performance was measured from one of the prototypes at relatively low exposures. However, high levels of charge trapping, lag and polarization, as well as pixel-to-pixel variations in x-ray sensitivity are of concern. While the results of the current study are promising, further development will be required to realize prototypes exhibiting the characteristics necessary to allow practical implementation of this approach." @default.
• W2123535172 created "2016-06-24" @default.
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• W2123535172 date "2008-02-14" @default.
• W2123535172 modified "2023-10-04" @default.
• W2123535172 title "Signal behavior of polycrystalline HgI₂at diagnostic energies of prototype, direct detection, active matrix, flat-panel imagers" @default.
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• W2123535172 doi "https://doi.org/10.1088/0031-9155/53/5/011" @default.
• W2123535172 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2706137" @default.
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• W2123535172 hasPublicationYear "2008" @default.
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