The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1981
Filed:
Aug. 28, 1979
Applicant:
Inventor:
Christopher J Thompson, Montreal, CA;
Assignee:
Montreal Neurological Institute, Montreal, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01T / ;
U.S. Cl.
CPC ...
2503 / ; 250367 ;
Abstract
A circular array of detectors is used for detecting coincident events and the point of annihilation in a positron annihilation process in a selected plane wherein the output from the detectors is processed in a computer to provide image reconstruction for the selected plane. Bismuth germanate is shown to be more efficient than previously used detectors and the adaption of trapezoidal shape for the detectors enables more efficient utilization of the photons produced in the process. The use of absorbing metal reducing plugs between adjacent detectors may be used to decrease the aperture function of the detectors for low angles of incident radiation.