Radiant energy – Invisible radiant energy responsive electric signalling – Signalling means controls incident radiation
Patent
1977-12-15
1979-07-03
Dixon, Harold A.
Radiant energy
Invisible radiant energy responsive electric signalling
Signalling means controls incident radiation
250361R, 250369, 250445T, G01J 142
Patent
active
041601653
ABSTRACT:
An X-ray detecting system includes a number of X-ray detectors mounted on the periphery of a vertical ring rotatable about a patient to be scanned diametrically opposite from an X-ray tube, slit collimator and chopper wheel mounted on the ring. Each detector includes a scintillator crystal typically of NaI, a photomultiplier tube that receives light from the crystal proportional to the incident X-rays, an amplifier energized by the output of the photomultiplier tube that provides a proportional signal to an LED that energizes both the photomultiplier tube (PMT) to provide light feedback and a photodiode that provides an electrical output signal so that the total current at the PMT anode resulting from X-ray light and LED light is constant. Circuitry is preferably included so that the LED supplies only the chopped part of the X-ray equivalent light signal with practically no d-c component.
REFERENCES:
patent: 2193789 (1940-03-01), Braselton
patent: 3171032 (1965-02-01), Holt
patent: 3198947 (1965-08-01), Arrison et al.
patent: 3670202 (1972-06-01), Paine et al.
patent: 3903417 (1975-09-01), Peter
patent: 4032784 (1977-06-01), Rich
McCombs Allan K.
Stein Jay A.
American Science and Engineering, Inc.
Dixon Harold A.
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