title: Energy-sensitive photon counting detector-based X-ray computed tomography.
abstract: Energy-sensitive photon counting detectors (PCDs) have recently been developed for medical X-ray computed tomography (CT) imaging and a handful of prototype PCD-CT systems have been built and evaluated. PCDs detect X-rays by using mechanisms that are completely different from the current CT detectors (i.e., energy integrating detectors or EIDs); PCDs count photons and obtain the information of the object tissues (i.e., the effective atomic numbers and mass densities) to be imaged. Therefore, these PCDs have the potential not only for evolution-to improve the current CT images such as providing dose reduction-but also for a revolution-to enable novel applications with a new concept such as molecular CT imaging. The performance of PCDs, however, is not flawless, and thus, it requires integrated efforts to develop PCD-CT for clinical use. In this article, we review the current status and the prediction for the future of PCDs, PCD-CT systems, and potential clinical applications.
authors.affiliation: Division of Medical Imaging Physics, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, 601 North Caroline Street, JHOC Room 4263, Baltimore, MD, 21287, USA. ktaguchi@jhmi.edu.
authors.forename: Katsuyuki
authors.identifier: http://orcid.org/0000-0002-3437-2107
authors.initials: K
authors.lastname: Taguchi
mesh_terms: D006801:Humans; D017785:Photons; D011829:Radiation Dosage; D012542:Scattering, Radiation; D012588:Scintillation Counting / Q000295:instrumentation*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*
keywords: Computed tomography; Photon counting; X-ray