Method of calibrating a gamma camera, and a gamma camera including a calibration device
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.
- Assignee:
- US Philips Corp.
- Patent Number(s):
- US 4517460
- OSTI ID:
- 6398887
- Resource Relation:
- Patent Priority Date: Priority date 18 Jun 1982, Netherlands; Other Information: PAT-APPL-389637
- Country of Publication:
- United States
- Language:
- English
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