TY - JOUR N2 - Hybrid pixel radiation detectors with a direct photon-to-charge conversion working in a single photon counting mode have gained increasing attention due to their high dynamic range and noiseless imaging. Since sensors of different materials can be attached to readout electronics, they enable work with a wide range of photon energies. The charge-sharing effect observed in segmented devices, such as hybrid pixel detectors, is a phenomenon that deteriorates both spatial resolution and detection efficiency. Algorithms that allow the detection of a photon irrespective of the charge-sharing effect are proposed to overcome these limitations. However, the spatial resolution of the detector can be further improved beyond the resolution determined by the pixel size if information about the charge proportions collected by neighbouring pixels is used to approximate the interaction position. In the article, an approach to achieve a subpixel resolution in a hybrid pixel detector working in the single photon counting mode is described. Requirements and limitations of digital inter-pixel algorithms which can be implemented on-chip are studied. In the simulations, the factors influencing the detector resolution are evaluated, including size of a charge cloud, number of virtual pixel subdivisions, and detector parameters. L1 - http://journals.pan.pl/Content/121723/PDF-MASTER/OPELRE_2021_29_4_A_Krzyzanowska.pdf L2 - http://journals.pan.pl/Content/121723 PY - 2021 IS - 4 EP - 191 DO - 10.24425/opelre.2021.139756 KW - charge-sharing KW - subpixel resolution KW - pixel detector KW - hit allocation KW - single photon counting A1 - Krzyżanowska, Aleksandra A1 - Szczygieł, Robert PB - Polish Academy of Sciences (under the auspices of the Committee on Electronics and Telecommunication) and Association of Polish Electrical Engineers in cooperation with Military University of Technology VL - 29 DA - 29.03.2022 T1 - Simulation study on improving the spatial resolution of photon-counting hybrid pixel X-ray detectors SP - 187 UR - http://journals.pan.pl/dlibra/publication/edition/121723 T2 - Opto-Electronics Review ER -