Dr. Rok Pestotnik: Advanced Photon Detectors for Positron Emission Tomography

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Povzetek:

   Advanced Photon Detectors for Positron Emission Tomography

   Dr. Rok Pestotnik, Institut "Jožef Stefan", Ljubljana

Positron Emission Tomography (PET) is a method in nuclear medicine, used for imaging of biochemical and physiologic processes in live tissues. The distribution of radioactive isotopes, positron emitters, is determined through detection of collinear annihilation gamma ray pairs in position sensitive detectors. The image quality depends on the spatial, energy and time resolution of a detection system. Recent progress in photo sensors, new scintillation materials and new detector concepts are crucial for the next generation PET scanners with much better performances. The photo detectors, operating in high magnetic fields, enable the construction of a dual modality PET - MRI imager, that incorporates PET functional imaging with the MRI morphological imaging. Fast photo sensors enable the measurement of the Time-Of-Flight of annihilation gamma rays resulting in a significant reduction of the image background.  In the seminar, basic concepts of the positron emission tomography will be discussed, followed by a review of recent developments in the gamma ray detectors for PET.