9 March 2018 Evaluation of a new photon-counting imaging detector (PCD) with various acquisition modes
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The prospect of improved low noise, high speed, and dual-energy imaging that may be associated with the use of photon-counting imaging detectors (PCD) has motivated this evaluation of a newly upgraded version of a prototype PCD. The XCounter Actaeon was evaluated in its four acquisition modes each based upon varying signal processing firmware including a mode with charge sharing correction that enables neighboring pixels that share the energy from one incident x-ray photon detection to be counted only once at the proper summed energy in the pixel with the largest charge deposition. Since this PCD is a CdTe-based direct detector with 100 μm pixels, such charge sharing for typical medical x-ray energy photons may occur frequently and must be corrected to achieve more accurate counts. This charge sharing correction is achieved with an Anti-Coincidence Circuit (ACC) which prevents double pixel counting from one event as well as prevents counting from either event if they are below a preset threshold. Various physical parameters of the PCD were evaluated including linearity, sensitivity, pulse pile-up effects, dark noise, spatial resolution, noise power spectrum, and detective quantum efficiency.
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A. Shankar, J. Krebs, D. R. Bednarek, S. Rudin, "Evaluation of a new photon-counting imaging detector (PCD) with various acquisition modes", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 105734Y (9 March 2018); doi: 10.1117/12.2294629; https://doi.org/10.1117/12.2294629

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