Patents by Inventor Harm Fortuin

Harm Fortuin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of calibrating a gamma camera, and a gamma camera including a calibration device
    Patent number: 4517460
    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.
    Type: Grant
    Filed: June 18, 1982
    Date of Patent: May 14, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Hendrik J. Meulenbrugge, Harm Fortuin