| 摘要 |
A gamma-camera comprising means for locating scintillations produced under the effect of gamma radiation in a scintillation crystal, the said location means comprising an array of photomultiplier tubes which are gain-controlled using calibrated light pulses, and a location circuit in which each photomultiplier tube (i) is connected, on the one hand, through a diode (Di) termed a resolution diode, to a weighting circuit (10i') comprising an array of resistors (R1i, R2i, R3i, R4i) connected to output adders (11) and, on the other hand, to a linearisation circuit (20i) supplying a signal It termed the linearity-threshold signal. According to the invention, the said linearisation circuit (20i) includes means for additionally supplying, for a period of time at least equal to the duration of the calibrated light pulses, a pulse (U) for blocking the said resolution diode (Di) with respect to the electrical pulses (Impi) delivered by the photomultiplier tube (i) in response to said light pulses. Application to nuclear medicine. <IMAGE> |
