Abstract: An apparatus for destroying concretions in an object or an organism, has a device (300) for the emission of waves, which is arranged outside said object or organism, and for focussing these waves onto the location of concretions which are localized by means of a localization device. The localization device has a fluoroscopy assembly (100) for determining an axis S.sub.1 L.sub.1 of the location of the concretion to be destroyed, and an assembly (200) for detecting photons diffused transversely of said location axis. The fluoroscopy assembly (100) has an X-ray source (101) and a diaphragm (111) as well as a system (102) for the processing of signals and the calculation of coordinates. The assembly (200) for the detection of diffused photons includes a photon detector and an electronic circuit (204) for counting, the detected scintillations.

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.

Abstract: A scintillation camera, comprises the structure of a scintillation crystal (10), a collimator (20), a light guide (30), an array (50) of p photodetectors, p acquisition channels (60), and a processor (100) for supplying the coordinates x.sub.j and y.sub.j of a scintillation j and its associated energy E.sub.j, and further comprises structure characterized in that:(A) the p acquisition channels apply p digital signals to the input of the processor;(B) the processor (100) itself comprises:(a) a bus for transferring the p digital signals;(b) a digital summing stage (200);(c) a scintillation processing stage; and(C) a detection, sequencing and storage stage (400) which receives a signal which corresponds to the sum of the p output signals of the photodetectors, is provided in order to supply the various clock signals and the correction coefficients for the scintillation processing stage.

Abstract: A scintillation camera which comprises a scintillation crystal, a light guide for coupling the crystal to the entrance window of an array of p photodetectors, p acquisition channels (60) which supply p electric signals, and a processor which serves to supply the coordinates x.sub.j and y.sub.j of a scintillation j and its associated energy E.sub.j, is characterized in that:(A) the p channels (60) realize the amplification, filtering and sampling of the output signals of the photodetectors, followed by A/D conversion of the samples obtained and their summing, and supply p digital signals to the input of the processor;(B) the processor itself comprises:(a) a bus (150) for transferring the p digital signals;(b) a digital summing stage (200) which comprises a buffer memory (201), a threshold subtraction circuit (211), four digital weighted sum forming devices (221) to (224), and a threshold calculation device (231);(c) a scintillation processing stage which supplies the three coordinate and energy signals x.sub.

Abstract: A gamma camera (1), has a scintillation block with an entrance window (10) constituted by a mechanically stiff supporting structure which very slightly absorbs X and gamma rays. The entrance window (10) supporting the scintillation block (3) may be constituted by a honeycomb structure of a light material.