Gamma camera with gain compensation
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United States of America Patent
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-
Dec 13, 1994
Grant Date -
N/A
app pub date -
Jan 26, 1994
filing date -
Jan 27, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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