Scintillation camera

Details Scintillation camera Scintillation camera

1988-04-26

1989-11-21

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036302, G01T 1208

Patent

active

048824950

ABSTRACT:
In a scintillation camera having a scintillator, a plurality of photomultiplier tubes optically coupled with the scintillator for converting light flashes into electric signals, and a position calculating circuit for calculating incident positions of radioactive rays on the scintillator to produce a position signal indicative of the position of each photomultiplier tube and a display signal, a photomultiplier tube changeover circuit for determining in response to the position signal which one of the photomultiplier tubes has been just irradiated with radiation rays and for outputting output signals only from each photomultiplier tube, an averaging circuit for taking an arithmetical average of the output signals with respect to a predetermined number of the output signals to thereby obtain an average thereof, a correction value calculating circuit for detecting a variation in the sensitivity of each photomultiplier tube by comparing the averaged magnitude of the output signals from the averaging circuit with a reference value determined by the energy of the incident radioactive rays to thereby calculate a correction value for each photomultiplier tube: and a photomultiplier tube correcting circuit for controlling a voltage applied to each photomultiplier tube to thereby automatically adjust the sensitivity of each of the photomultiplier tubes.

REFERENCES:
patent: 4517460 (1985-05-01), Meulenbrugge et al.
patent: 4566074 (1986-01-01), Nishikawa

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