Authors:
Elfatih Abuelhia University of Surrey Physics Department, School of Electronics and Physical Sciences Guilford, Surrey GU2 7XH UK

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K. Kacperski University of Surrey Physics Department, School of Electronics and Physical Sciences Guilford, Surrey GU2 7XH UK

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N. Spyrou University of Surrey Physics Department, School of Electronics and Physical Sciences Guilford, Surrey GU2 7XH UK

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Abstract  

In spite of the relative rareness of positron annihilation into three photons, it may still be exploited to develop a new imaging modality. It would provide information not only about the local concentration of radionuclide, but also, by virtue of chemical interactions of positronium, the local chemical environment in tissue. In particular, the concentration of free oxygen could be determined, which would be a significant advantage in oncological applications of PET. The paper presents results of experimental imaging of point-like sources using the 3-photon annihilations registered by a system of three high energy resolution detectors in coincidence. After filtering out the irrelevant random coincidences images of activity distributions are reconstructed. The positions of the sources are reproduced with good accuracy. The influence of random triple coincidences arising from the predominant 2-gamma annihilations, which may contribute to image noise is discussed. The analysis of experimental results is reinforced by computer simulations.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)