Photonenzählende Detektoren (PZD) sind die aktuellste Entwicklung in der
CT. Die Vorteile im Vergleich zu den klassischen energieintegrierenden
Detektoren (EID) liegen im reduzierten elektronischen Rauschen, der
höheren Ortsauflösung, dem erhöhten
Kontrast-Rausch-Verhältnis und einer besseren Dosiseffizienz.
Zusätzlich kann der Einsatz von Kontrastmitteln reduziert werden. In
diesem Artikel werden die technischen Grundlagen erläutert.
Abstract
Photon counting detectors (PCD) are a recent development in computed tomography
(CT) and represent a promising new technology. This technique has been used in
nuclear medicine during the past years, but at relatively low photon count
rates. However, recent developments in semiconductor technology have enabled the
use in computed tomography. PCD are direct conversion detectors and they
separate the incoming photons into different energy levels. The advantages
compared to classic energy-integrating detectors (EID) are reduced electronic
noise, higher spatial resolution, increased contrast-to-noise ratio and better
dose efficiency. At the same time, energy-resolved image data can be acquired,
which can reduce the use of contrast media. PCD-CT have the potential to
significantly influence routine clinical diagnostics, which is why the technical
principals for radiology technologists are explained in this article.
Schlüsselwörter
photonenzählende Detektoren - CT - Photonen - energieintegrierende Detektoren
Key word
photon counting detector - computed tomography - photons - energy-integrating detector
