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15 February 2021 Anomalous edge response of photon counting detectors induced by pulse pileup and anti-coincidence logic
Xu Ji, Ran Zhang, Ke Li
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Proceedings Volume 11595, Medical Imaging 2021: Physics of Medical Imaging; 115950F (2021) https://doi.org/10.1117/12.2581086
Event: SPIE Medical Imaging, 2021, Online Only
Abstract
A peculiar edge enhancement effect was observed when a PCD was operated under anti-coincidence mode and irradiated by high-flux x-rays to cause pulse pileups. The severity of this effect increases with the input flux level and completely disappears when the anti-coincidence mode is turned off. A theoretical analysis shows that this edge enhancement effect was jointly caused by the pulse pileup-induced count loss and the arbitration process used the anti-coincidence logic. Compared with pixels blocked by an edge, pixels immediately outside the edge has a much higher likelihood to win the arbitration when there are coincident x-rays.
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Xu Ji, Ran Zhang, and Ke Li "Anomalous edge response of photon counting detectors induced by pulse pileup and anti-coincidence logic", Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 115950F (15 February 2021); https://doi.org/10.1117/12.2581086
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KEYWORDS
Sensors
Logic
Photon counting
Photodetectors
Spatial resolution
Time correlated photon counting
Tungsten
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