Regensburg 2007 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 1: Medizinische Bildgebung I

ST 1.2: Talk

Monday, March 26, 2007, 10:00–10:15, Ch 12.0.16

Performance results from a high resolution, dual layer LSO-APD PET tomograph for small animals — •Virginia Spanoudaki, Irene Torres-Espallardo, and Sibylle Ziegler — Klinikum rechts der Isar der TU München, Nuklearmedizin, Ismaninger Str 22, 81675, München, Germany

MADPET-II is a high resolution positron emission tomograph aimed at radiopharmaceutical studies in small animals. The detector architecture is based on the individual readout of minute LSO scintillation crystals by Avalanche Photodiodes (APDs). A dual radial detector layer assures uniformity of the spatial resolution along the radial Field of View while maintaining the system's sensitivity. In total, the system consists of 1152 independent electronic channels. The tomograph performs list mode data acquisition, recording the energy and time stamp for every detected singles event. Coincident sorting and system calibration is done post acquisition in software.

The measured mean energy resolution of the system is 22 % and the system-wide time resolution is 9 nsec. The individual detector readout assures a maximum count rate of 10000 cps per channel. First phantom studies exhibit a spatial resolution of 1.25 mm along a central slice of the scanner. For the image reconstruction a 3D MLEM algorithm based on a Monte Carlo System Matrix is used. Results from performance evaluation measurements and the first animal studies will be presented.