Amendolia, Salvator Roberto and Bisogni, Maria Giuseppina and Bottigli, Ubaldo and Delogu, Pasquale and Dipasquale, Giovanna and Fantacci, Maria Evelina and Marchi, Alex and Marzulli, Vincenzo M. and Oliva, Piernicola and Palmiero, Rosa and Rosso, Valeria and Stefanini, Arnaldo and Stumbo, Simone and Zucca, Sergio (2001) Spectroscopic and imaging capabilities of a pixellated photon counting system. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 466 (1), p. 74-78. ISSN 0168-9002. Article.
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We are studying the performance of various thickness GaAs pixel detectors bump-bonded to a dedicated photon counting chip (PCC) for medical imaging applications in different energy ranges. In this work we present the experimental results obtained with a 600 μm thick pixel matrix (64×64 square pixels, 170 μm side) in the 60–140 keV energy range to evaluate the possible use of such a system in the nuclear medicine field. In particular, we have measured the spectroscopic properties of the detector (charge collection efficiency, energy resolution and detection efficiency) and evaluated the discrimination capability of the electronics. Then we have measured the imaging properties of the whole system in terms of Point Spread Function and using a home made thyroid phantom. We present also a comparison with a traditional gamma camera and an evaluation, made by both experimental measurements and software simulations, of the imaging characteristics related to the use of a collimation system.
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