Abstract

Over the last decade, afundamentally new type of computed tomography (CT) detectors has proved its superior capabilities in both physical and preclinical evaluations and is now approaching the stage of clinical practice. These detectors are able to discriminate single photons and quantify their energy and are hence called photon-counting detectors. Among the promising benefits of this technology are improved radiation dose efficiency, increased contrast-to-noise ratio, reduced metal artifacts, improved spatial resolution, simultaneous multi-energy acquisitions, and the prospect of multi-phase imaging within asingle acquisition using multiple contrast agents. Taking the conventional energy-integrating detectors as areference, the authors demonstrate the technical principles of this new technology and provide phantom and patient images acquired by awhole-body photon-counting CT. These images serve as abasis for discussing the potential future of clinical CT.

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