Gamma camera with on the fly calibration for PMT drift

Details Gamma camera with on the fly calibration for PMT drift Gamma camera with on the fly calibration for PMT drift

1996-06-19

1997-10-14

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2502521, G01T 1208

Patent

active

056775369

ABSTRACT:
An automatic calibration system corrects for photomultiplier drift while the gamma camera is in imaging mode. The known constant energy from the gamma rays producing scintillated light is used to effect the drift adjustment by weighting the position signals of the scintillations to determine if a valid event has occurred and building, for each photomultiplier in the camera, a statistically valid, spectral energy histogram. When the histogram counts reach a sufficient sample size the histogram data is read out in a discriminatory manner to account for noise and Compton scattering effects and used to either directly adjust the photomultiplier gain or the calibration look up tables depending on what type of system is used by the camera to process the photomultiplier signals.

REFERENCES:
patent: 4272677 (1981-06-01), Berthold et al.
patent: 4857722 (1989-08-01), Kumagawa et al.
patent: 4866615 (1989-09-01), Ichihara
patent: 5004904 (1991-04-01), Yamakawa et al.
patent: 5373161 (1994-12-01), Tararine et al.
patent: 5410153 (1995-04-01), Ferreira
patent: 5449897 (1995-09-01), Bertelsen et al.
patent: 5512755 (1996-04-01), Vickers et al.
patent: 5539202 (1996-07-01), Geagan et al.
Photomultiplier Handbook, by Burle Technologies, Inc., 1980, pp. 80-83 and 126-127.

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