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Which is best overall is unsettled.","posed_since":"2012","precise":"Compare cadmium telluride, cadmium zinc telluride and deep-silicon sensors on detection efficiency at 20 to 140 keV, charge-transport polarization at fluxes above $10^{8}$ counts per second per $\\mathrm{mm}^{2}$, charge-sharing fraction at a given pixel pitch, and K-escape, under identical clinical conditions. An answer is a classification of which material wins for which imaging task, with the physical reasons.","problem_ref":null,"references":"","settled_by":"Side-by-side measurement of the same imaging tasks on detectors of each material at clinical flux.","status_note":"CdTe-based clinical systems have been in use since 2021; deep-silicon systems moved from clinical prototypes toward commercial release around 2025, and no side-by-side comparison under identical conditions has settled the question.","title":"Sensor material choice for clinical count 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