Photon-counting detectors in computed tomography: from quantum physics to clinical practice
Abstract
Over the last decade, a fundamentally 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 a single acquisition using multiple contrast agents. Taking the conventional energy-integrating detectors as a reference, the authors demonstrate the technical principles of this new technology and provide phantom and patient images acquired by a whole-body photon-counting CT. These images serve as a basis for discussing the potential future of clinical CT.
Im vergangenen Jahrzehnt hat ein grundlegend neuer Detektortyp in der Computertomographie (CT) seine überlegene Leistungsfähigkeit gezeigt, sowohl in physikalischen als auch in präklinischen Prüfungen. Nun nähert er sich der klinischen Anwendung. Diese Detektoren können einzelne Photonen voneinander unterscheiden und deren Energie messen. Entsprechend werden sie als Photonenzählende Detektoren bezeichnet. Zu den vielversprechenden Vorzügen der neuen Technik gehören die verbesserte Strahlendosiseffizienz, ein erhöhtes…
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