Abonnement à la biblothèque: Guest
International Symposium on Imaging in Transport Processes.
May, 25-29, 1992, Athens, Greece

DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc


ISBN Print: 978-1-56700-012-2

MONTE CARLO TECHNIQUES IN POSITRON EMISSION TOMOGRAPHY IMAGING

pages 587-600
DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc.540
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RÉSUMÉ

Positron emission tomography (PET) is a non-invasive technique that can be used to image the function, i.e. metabolism, rather than the anatomy in a living system. As such, it is complementary to anatomy imaging modalities like X-ray CT and Magnetic Resonance Imaging (MRI). In PET, positron emitting radionuclides are introduced to the living system to be used as tracers. A positron emitted from the isotope nucleus annihilates with an electron at rest to give out two 511-keV γ-rays emitted at opposite directions. The resulting γ-rays can be detected by γ-ray detectors arranged in one or more circular rings that are part of the PET tomograph.
The design of a PET tomograph and its components is a rather complicated and expensive process. For this reason, the use of sophisticated Monte Carlo simulation techniques in the design of the scanner is appropriate. In this way, the basic y-ray detector unit, and the whole scanner can be modeled. If this is accomplished, then the response of individual detectors as well as the performance of the PET scanner can be predicted before the actual construction of the system. The study can be as accurate as one wishes, provided that all the physical processes that affect the operation of the scanner are taken into account and simulated correctly. At the design phase, one can vary the parameters of the detector and/or the scanner and study their performance. In this way one can have a computer aided design and a Monte Carlo evaluation of the scanner before its construction.

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