Photon counting arrays with energy resolving capabilities are recently desired for the next-generation X-ray imaging systems. In this work, we present the performance of a 2 mm thick CZT pixel detector, with pixel pitches of 500 μm and 250 μm, coupled to a fast and low noise ASIC (PIXIE ASIC), characterized by only the preamplifier stage. A 16-channel digital readout electronics was used to continuously digitize and process each output channel from the PIXIE ASIC, performing multi-parameter analysis (event arrival time, pulse shape, pulse height) at low and high input counting rates (ICRs). The spectroscopic response of the system to monochromatic X-ray and gamma ray sources, at both low and high ICRs, is presented with particular attention to the mitigation of some typical spectral distortions (pile-up and charge sharing). The detector allows good energy resolution at moderate cooling (3% FWHM 59.5 keV, -1200 V, T = 5 C) by using fast shaped pulses (i.e. pulses with time widths of 300 ns). Charge sharing investigations were performed by using a fine time coincidence analysis (TCA) and a pulse shape analysis (PSA). The potentialities of the PSA for charge sharing detection even at high photon counting rates were also shown.

Abbene, L., Principato, F., Gerardi, G., Benassi, G., Zambelli, N., Zappettini, A., et al. (2017). Digital CZT detector system for high flux energy-resolved X-ray imaging. In 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 (pp. 1-7). Institute of Electrical and Electronics Engineers Inc. [10.1109/NSSMIC.2016.8069943].

Digital CZT detector system for high flux energy-resolved X-ray imaging

Abbene, L.
;
Principato, F.;Gerardi, G.;
2017-10-16

Abstract

Photon counting arrays with energy resolving capabilities are recently desired for the next-generation X-ray imaging systems. In this work, we present the performance of a 2 mm thick CZT pixel detector, with pixel pitches of 500 μm and 250 μm, coupled to a fast and low noise ASIC (PIXIE ASIC), characterized by only the preamplifier stage. A 16-channel digital readout electronics was used to continuously digitize and process each output channel from the PIXIE ASIC, performing multi-parameter analysis (event arrival time, pulse shape, pulse height) at low and high input counting rates (ICRs). The spectroscopic response of the system to monochromatic X-ray and gamma ray sources, at both low and high ICRs, is presented with particular attention to the mitigation of some typical spectral distortions (pile-up and charge sharing). The detector allows good energy resolution at moderate cooling (3% FWHM 59.5 keV, -1200 V, T = 5 C) by using fast shaped pulses (i.e. pulses with time widths of 300 ns). Charge sharing investigations were performed by using a fine time coincidence analysis (TCA) and a pulse shape analysis (PSA). The potentialities of the PSA for charge sharing detection even at high photon counting rates were also shown.
16-ott-2017
9781509016426
Abbene, L., Principato, F., Gerardi, G., Benassi, G., Zambelli, N., Zappettini, A., et al. (2017). Digital CZT detector system for high flux energy-resolved X-ray imaging. In 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016 (pp. 1-7). Institute of Electrical and Electronics Engineers Inc. [10.1109/NSSMIC.2016.8069943].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/271787
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