Gamma camera with gain compensation

Details Gamma camera with gain compensation Gamma camera with gain compensation

1994-01-26

1994-12-13

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2502521, 250369, G01T 1208

Patent

active

053731611

ABSTRACT:
A gamma camera includes means for the localization of scintillations produced under the effect of a gamma radiation in a scintillator crystal, the localization means including an array of photomultiplier tubes with gain control obtained by means of calibrated light pulses, and a localization circuit wherein each photomultiplier tube is connected, firstly, through a diode called a resolution diode, to a weighting circuit comprising a network of resistors connected to output adders and, secondly, to a linearizing circuit giving a signal called a linearity signal. The linearizing circuit also gives, for a duration at least equal to the duration of the calibrated light pulses, a pulse to inhibit the resolution diode with respect to the electrical pulses delivered by the photomultiplier tube in response to the light pulses.

REFERENCES:
patent: 3980886 (1976-09-01), Stout
patent: 4475042 (1984-10-01), Arseneau
patent: 4629895 (1986-12-01), Mestais et al.
patent: 4866615 (1989-09-01), Ichihara
patent: 5004904 (1991-04-01), Yamakawa et al.
patent: 5237173 (1993-08-01), Stark et al.

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