Design und Optimierung von digitalen Gamma-Kameras – Herz und Ganzkörper

Zusammenfassung

Neueste Entwicklungen im Nachweisverfahren der direkten Konvertierung („direct conversion detection“) haben die Tür für eine neue Generation von SPECT- und SPECT/CT-Kameras mit erhöhter Bildqualität und verbesserten diagnostischen Möglichkeiten geöffnet. Diese Kameras, entwickelt von Spectrum Dynamics, sind mit Teleskoparmen bestückt, welche die Detektoren so nah wie möglich an den Körper des Patienten bringen, um die Erfassung von Photonen in einer gegebenen Scanzeit zu maximieren. Da die räumliche Nähe auch die statistische Unschärfe der Photonen-Herkunftsorte reduziert, wird die Bildqualität ebenfalls verbessert. Die direkte Konvertierung der Kamera zusammen mit ihren an die Körperoberfläche anpassbaren Detektoren ist weiterhin mit einer neuartigen Dreh-Scan-Strategie kombiniert, wodurch die räumliche Auflösung weiter verbessert wird. Zusammen mit fortschrittlichen und schnellen Algorithmen der iterativen Rekonstruktion, durchgeführt von schnellen Grafikkarten, wird so die nächste Generation von SPECT- und SPECT/CT-Bildern geschaffen.

Abstract

Recent advancements in direct conversion detection have opened the gate to a new generation of SPECT and SPECT/CT scanners with improved image quality and diagnostic capabilities. Such scanners, developed by Spectrum Dynamics, are equipped with telescopic arms that position the detectors as close as possible to the patientʼs body for maximizing the collection of photons per scan time. As proximity also reduces the statistical uncertainty of the photonsʼ origin location, the general image quality is improved as well. The scannerʼs direct conversion and body adapted detectors are also combined with a novel swivel scan strategy for further improving the spatial resolution and with advanced and rapid iterative reconstruction algorithms, implemented by graphics processing units, to produce the next generation of SPECT and SPECT/CT images.

Schlüsselwörter

Molekulare Bildgebung - Nuklearmedizin - SPECT - SPECT/CT - CZT - Digitaler Detektor - 360° CZT

Keywords

Molecular imaging - Nuclear Medicine - SPECT - SPECT/CT - CZT - Digital Detector - 360° CZT

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