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ST: Strahlen- und Medizinphysik
ST 9: PET und CT
ST 9.3: Vortrag
Dienstag, 14. März 2006, 15:10–15:20, D
New developments in detectors for in-beam PET — •——— P. Crespo1, T. Barthel2, M. Kapusta3, K. Heidel1, M. Moszyński4, J. Pawelke1, and W. Enghardt1,5 — 1Forschungszentrum Rossendorf, Institute of Nuclear and Hadron Physics, Dresden, Germany — 2Klinikum Chemnitz gGmbH, Klinik für Radioonkologie, Chemnitz, Germany — 3Gamma Medica-Ideas, Fornebu, Norway — 4Soltan Institute for Nuclear Studies, Otwock-Świerk, Poland — 5Zentrum für Innovationskompetenz, ZIK OncoRay, Dresden, Germany
State-of-the-art technology has outperformed the efficiency of the positron emission tomograph installed at the Gesellschaft für Schwer-ionenforschung for monitoring, in-beam, ion radiation therapy. In addition, the special requirements of in-beam PET have been better understood. We explain these special requisites and present dedicated in-beam PET readout solutions, either tested in-beam or under development. Experimental results obtained with two multi-pixel, gamma-ray detectors consisting of lutetium oxyorthosilicate (LSO) coupled to avalanche photodiode arrays (APDA) show that this detector provides a good solution for improved, next-generation in-beam PET scanners. Nevertheless, we extrapolate recent detector and scintillator developments, enabling sub-nanosecond coincidence time resolution (τ), onto a possible in-beam time-of-flight (TOF) PET scanner. We show that τ < 200 ps full width at half maximum allows: (1) images to be shown to the radiooncologist in real-time, (2) artifact-free images to be obtained from dual-head tomographs, (3) an absolute quantification of image intensity and (4) to obtain optimum PET images corrected from biological washout mechanisms.