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Grundlagen der Flachdetektor-CT (FD-CT)

Basics priciples of flat detector computed tomography (FD-CT)

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Zusammenfassung

Flachdetektoren (FD) sind für die Anwendung in der Radiographie und Fluoroskopie entwickelt worden, um die damaligen Standards – Film-Folien-Kombinationen (FFK) und Bildverstärker (BV) – zu ersetzen. Im Vergleich zu FFK und BV bietet die FD-Technologie eine höhere Dynamik, Verzerrungsfreiheit und eine gesteigerte Dosiseffizienz. Weitere Vorteile sind die Anfertigung Serienaufnahmen, eine sofortige Digitalausgabe und eine kompakte Bauweise. Dies legt auch eine Anwendung von Flachdetektoren in der Computertomographie (CT) nahe. Inzwischen ist die FD-CT weitgehend in der interventionellen und intraoperativen Bildgebung etabliert – meist als C-Bogen-System. Die FD-Technologie hat erstmals die Weichteilbildgebung in der interventionellen Suite ermöglicht, was mit BV-Systemen nicht möglich war. Diese Übersichtsarbeit konzentriert sich auf die technischen Eigenschaften der FD-Technologie im Hinblick auf die interventionelle 3D-Bildgebung. Das Ziel der FD-CT ist nicht, die klinische CT hinsichtlich der typischen diagnostischen Untersuchungen zu ersetzen. Ihre Vorteile sind v. a. praktischer Art, wie die sofortige Verfügbarkeit der CT-Bildgebung während einer Intervention.

Abstract

Flat detectors (FDs) have been developed for use in radiography and fluoroscopy to replace standard X-ray film, film-screen combinations and image intensifiers (II). In comparison to X-ray film and II, FD technology offers higher dynamic range, dose reduction, fast digital readout and the possibility for dynamic acquisitions of image series, yet keeping to a compact design. It appeared logical to employ FD designs also for computed tomography (CT) imaging. FDCT has meanwhile become widely accepted for interventional and intra-operative imaging using C-arm systems. Additionally, the introduction of FD technology was a milestone for soft-tissue CT imaging in the interventional suite which was not possible with II systems in the past. This review focuses on technical and performance issues of FD technology and its wide range of applications for CT imaging. FDCT is not aimed at challenging standard clinical CT as regards to the typical diagnostic examinations, but it has already proven unique for a number of dedicated CT applications offering distinct practical advantages, above all the availability of immediate CT imaging during an intervention.

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Authors and Affiliations

  1. Institut für Medizinische Physik, Universität Erlangen-Nürnberg, Henkestr. 91, 91052, Erlangen, Deutschland

    Y. Kyriakou, T. Struffert, A. Dörfler & W.A. Kalender

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  1. Y. Kyriakou
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  2. T. Struffert
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  3. A. Dörfler
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  4. W.A. Kalender
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Correspondence to Y. Kyriakou.

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Kyriakou, Y., Struffert, T., Dörfler, A. et al. Grundlagen der Flachdetektor-CT (FD-CT). Radiologe 49, 811–819 (2009). https://doi.org/10.1007/s00117-009-1860-9

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  • DOI: https://doi.org/10.1007/s00117-009-1860-9

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