Method of calibrating a gamma camera, and a gamma camera...

Details Method of calibrating a gamma camera, and a gamma camera... Method of calibrating a gamma camera, and a gamma camera...

G - Physics

01

T

324/3, 358/11.05

G01T 1/202 (2006.01) G01T 1/164 (2006.01)

Patent

CA 1187627

11 ABSTRACT: A gamma camera with a calibration device which samples the output signal of the photomultiplier tube/ amplifier combination, after which it determines a mean amplitude from the amplitudes of the samples, the mean amplitude being compared with a reference value and the gain factor of the amplifier being corrected thereby 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 dia- phragm with holes which are situated exactly in front of the centres of the photomulipliers, and a circuit which is controlled by a microprocessor for the sequential cali- bration of the amplifiers.

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