Development of a readout electronic for a Si-pixeldetector for application in a Compton camera [Elektronische Ressource] / vorgelegt von Iskander Ibragimov

Development of a readout electronicfor a Si-pixeldetector for applicationin a Compton cameraDISSERTATIONzur Erlangung des Grades eines Doktorsder Naturwissenschaftenvorgelegt vonDipl. Phys. Iskander Ibragimovaus Kasan, Russlandeingereicht beim Fachbereich Physikder Universit¨at SiegenSiegen 2004Gutachter der Dissertation: Prof. Dr. M. HolderProf. Dr. G. ZechDatum der Disputation: 26. Januar 2005Internetpublikation der Universit¨at Siegen: urn:nbn:de:hbz:467-982Development of a readout electronicfor a Si-pixeldetector for applicationin a Compton camerabyIskander IbragimovAbstract: Compton cameras are very promising gamma-ray imaging systems, whichhave already found their application in astrophysics. Their use in nuclear medicine couldofferhighersensitivity andbetterspatialresolutionthanexisting mechanically-collimatedgamma cameras, leading toa reduction oftheradiationdose given toa patient. AComp-toncameraconsistsbasicallyoftwodetectors: ascatterdetector, whereComptonscatter-ing takes place, and a photoabsorber, where the scattered photons are absorbed. Siliconpixel detectors are the best choice for a scatter medium since they provide good positionresolution, good energy resolution at room temperature and a relatively small Dopplerbroadening effect. Scintillation detectors are preferred for the use as a photoabsorberbecause of their greater stopping power.