Simulation study on improving the spatial resolution of photon-counting hybrid pixel X-ray detectors

• Autorzy: Krzyżanowska Aleksandra , Szczygieł Robert

Identyfikatory

DOI

10.24425/opelre.2021.139756

• Języki publikacji: EN

Abstrakty

EN

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 chargé 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.

Słowa kluczowe

EN

charge sharing; subpixel resolution; pixel detector; hit allocation; single photon counting

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2021
• Tom: Vol. 29, No. 4
• Strony: 187--191
• Opis fizyczny: Bibliogr. 18 poz., il., wykr.

Twórcy

autor

Krzyżanowska Aleksandra

• AGH University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Krakow, Poland

• https://orcid.org/0000-0002-1981-7067

autor

Szczygieł Robert

• AGH University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Krakow, Poland

• https://orcid.org/0000-0001-6342-0107

Bibliografia

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