发明名称 |
Method of calibrating a gamma camera, and gamma camera comprising a calibration device. |
摘要 |
<p>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.</p> |
申请公布号 |
EP0068581(A1) |
申请公布日期 |
1983.01.05 |
申请号 |
EP19820200777 |
申请日期 |
1982.06.23 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
MEULENBRUGGE, HENDRIK JAN;FORTUIN, HARM |
分类号 |
G01T1/164;(IPC1-7):01T1/164 |
主分类号 |
G01T1/164 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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