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Positron Camera with Extended Counting Rate Capability

Searle Analytic Inc., Searle Radiographics Inc., Des Plaines, Illinois

Correspondence: For reprints contact: Gerd Muehllehner, Searle Analytic Inc., Searle Radiographics Inc., 2000 Nuclear Dr., Des Plaines, Ill. 60018.

ABSTRACT

Positron emitters may be imaged using two opposing scintillation cameras without collimators. The counting rate limitation of this approach can be largely overcome by using graded absorbers to reduce scattered radiation from the patient and using not only photopeak events but Compton events in the scintillator as well. This increases the useful counting rate by more than a factor of 5. By combining this technique with the use of fast electronics, useful images have been obtained in the presence of scattering material at counting rates above 7,500 cps.

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