Scintillation camera having computer control of electrical signals

Abstract

Scintillation camera inlcuding a scintillator crystal, a light guide, a set of p photodetectors, p acquisition channels (60), and a computer (100) intended to deliver the coordinates x.sub.j and y.sub.j of a scintillation j and the energy E.sub.j which is associated with this event j. This camera is characterized in that there is provided, between the output of the p acquisition channels and the input of the computer, a transfer control stage (200) including: (a) p subtractors (180) receiving on a first input the corresponding output of the p acquisition channels (60) and on a second common input a so-called slaved threshold evaluated by a threshold computer (170), (b) an additional acquisition channel (160) supplying to the threshold computer the digital energy signal E.sub.mj, (c) at the output of the additional acquisition channel and of the p substractors, (p+1) transfer control circuit (190), the (p+1).sup.th of these circuits providing the energy transfer signal, and (d) a transfer bus (250) receiving the (p+1) output signals of the (p+1) transfer control circuits and delivering to the computer (100) on the one hand the energy signal and on the other hand p' signals from among the p output signals of the p first transfer control circuits.