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:
May. 14, 1985
Filed:
Jun. 18, 1982
Hendrik J Meulenbrugge, Eindhoven, NL;
Harm Fortuin, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A gamma camera is provided with a calibration device which samples the output signal of a photomultiplier tube/amplifier combination. After sampling, the calibration device determines a mean amplitude from the amplitudes of the samples with the mean amplitude being compared with a reference value, and the gain factor of the amplifier is corrected in order to eliminate a relative discrepancy occurring between the mean value and the reference value. To achieve this, the calibration device comprises a point source, a diaphragm with holes which are situated exactly in front of the centers of the photomultipliers, and a circuit which is controlled by a microprocessor for the sequential calibration of the amplifiers.