Abstract: The invention relates to a process for determining the position of an event with respect to a set of N photodetectors, comprising the following after digitization of the signal output by each photodetector: calculate an uncorrected position of the event, determine the distance of each photodetector from the uncorrected position, calculate a corrected value of the contribution of each photodetector as a function of the distance from P0, calculate a new position P1, as a function of the corrected contributions of the photodetectors and their position. Another purpose of the invention is a device for embodiment of the process.

Abstract: The invention relates to a process and a device for determining the position P0 of an event with respect to a set of N photodetectors, inducing a signal in the N photodetectors. This process comprises the following steps: a) digitize the signal output by each photodetector; calculate the energy of the signal output by each photodetector, b) calculate the contribution of the column to the total energy, to the X value of the center of gravity of the event and to the Y value of the center of gravity of the event, for each column, c) determine the total energy induced by the event and the coordinates of the center of gravity of the event with respect to the N photodetectors.

Abstract: A system for processing signals from a radiation detector with semiconductors. A plurality of elementary detectors are placed side-by-side along a detection surface or a detection volume in which radiation referred to as incident radiation is capable of giving up its energy in at least one interaction. The device includes the supplying in response to each incident ray, an amount of energy corresponding to the sum of the energies given up during each interaction induced by the incident radiation. This device may be used in medical imaging.

Abstract: Process for real time sorting of signals from several semi-conductor detection elements in which: a) during a calibration phase: amplitude data and signal rise time data are established for each event signal, a biparametric detection spectrum with amplitude and rise time data is acquired, a biparametric acceptance window corresponding respectively to an amplitude-rise time correlation is established, and b) during an examination phase: an amplitude, rise time data pair is established in real time for each event signal detected, the events are sorted in real time, selecting the signals according to whether their amplitude and rise time data are or are not within the window.

Abstract: Method and apparatus for determining a position of an event. The system processes signals from an assembly of N photodetectors and includes a signal generator for producing a signal representing the value of the maximum, or the energy, of a pulse delivered by the photodetector and is digitized. It also includes a signal generator for producing a threshold-exceeded signal for each photodetector when the amplitude of the signal representing the value of the maximum, or the energy, of the digitized pulse is greater than the threshold. It also includes a signal generator common to the photodetectors, for delivering a signal representing a position of an event as a function of the threshold-exceed signals. This device can be used with gamma cameras.