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Proceedings Paper

Quantum-counting CT in the regime of count-rate paralysis: introduction of the pile-up trigger method
Author(s): S. Kappler; S. Hölzer; E. Kraft; K. Stierstorfer; T. Flohr
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Paper Abstract

The application of quantum-counting detectors in clinical Computed Tomography (CT) is challenged by extreme X-ray fluxes provided by modern high-power X-ray tubes. Scanning of small objects or sub-optimal patient positioning may lead to situations where those fluxes impinge on the detector without attenuation. Even in operation modes optimized for high-rate applications, with small pixels and high bias voltage, CdTe/CdZnTe detectors deliver pulses in the range of several nanoseconds. This can result in severe pulse pile-up causing detector paralysis and ambiguous detector signals. To overcome this problem we introduce the pile-up trigger, a novel method that provides unambiguous detector signals in rate regimes where classical rising-edge counters run into count-rate paralysis. We present detailed CT image simulations assuming ideal sensor material not suffering from polarization effects at high X-ray fluxes. This way we demonstrate the general feasibility of the pile-up trigger method and quantify resulting imaging properties such as contrasts, image noise and dual-energy performance in the high-flux regime of clinical CT devices.

Paper Details

Date Published: 16 March 2011
PDF: 11 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79610T (16 March 2011); doi: 10.1117/12.877939
Show Author Affiliations
S. Kappler, Siemens Healthcare (Germany)
S. Hölzer, Siemens Healthcare (Germany)
E. Kraft, Siemens Healthcare (Germany)
K. Stierstorfer, Siemens Healthcare (Germany)
T. Flohr, Siemens Healthcare (Germany)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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