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The Journal of Nuclear Medicine Vol. 34 No. 8 1367-1376
© 1993 by Society of Nuclear Medicine
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A Rotating PET Scanner Using BGO Block Detectors: Design, Performance and Applications

David W. Townsend, Martin Wensveen, Larry G. Byars, Antoine Geissbuhler, Henri J. Tochon-Danguy, Anne Christin, Michel Defrise, Dale L. Bailey, Sylke Grootoonk, Alfred Donath and Ronald Nutt

Division of Nuclear Medicine, University Hospital, Geneva, Switzerland
CTI/Siemens PET Systems, Knoxville, Tennessee
Division of Nuclear Medicine, Vrije Universiteit, Brussels, Belgium
Division of Nuclear Medicine, Royal Prince Alfred Hospital, Sydney, Australia
MRC Cyclotron Unit, Hammersmith Hospital, London, United Kingdom

Correspondence: For correspondence and reprints contact: David W. Townsend, PhD, PET Facility, University of Pittsburgh Medical Center, Desoto at O'Hara Streets, Pittsburgh, PA 15261.

ABSTRACT

Recent advances in fully three-dimensional reconstruction for multi-ring PET scanners have led us to explore the potential of a prototype scanner based on the rotation of two opposing arrays of BGO block detectors. The prototype contains only one-third of the number of detectors in the equivalent full ring scanner, resulting in reduced cost. With a lower energy threshold at 250 keV, the absolute efficiency of the scanner is 0.5% and the scatter fraction is 35% for a 20-cm cylinder. Transaxial and axial spatial resolution is about 6 mm. The maximum noise equivalent count rate estimated for a 15-cm diameter cylinder is 36,000 cps at a concentration of 26 kBq/ml. The minimum scan time for a 18F-fluoro-2-deoxyglucose (FDG) brain study is 55 sec. The camera has been validated for clinical applications using both FDG and 82Rb.




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Copyright © 1993 by the Society of Nuclear Medicine.