Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Corinne Mestais

Olivier Monnet

Alain Chapuis

Jean-Pierre Rostaing

Claude Janin

Jean-Marc Dinten

Jean-Jacques Chaillout

Robert Allemand

Edmond Tournier

Anne Koenig

Alain Gliere

Michel Tararine

Raymond Campagnolo

Bernard Thevenin

Francis Sauvage

Jean-Paul Bonnefoy

Jean-Paul Bonnefoy-Claudet

Lo&iuml;ck Verger

Fran&aring;oise Mathy

Fran&ccedil;ois Lebrun

Ren&eacute; Dupre

Tournier Edmond

François Lebrun

Image formation process

Compact detection device for a gamma camera

A device for collection, digital encoding, and processing of signals from plural photo-detectors in a camera. The device includes plural digital encoding units, each digital encoding unit in the plural encoding units being associated with one individual photo-detector in the plural photo-detectors, and including a summation device and an analog-digital converter. A digital processing unit is connected to each encoding unit. Such a device may find particular application to gamma-cameras.

Device and method for collecting and encoding signals coming from photodetectors

A semiconductor detector including at least one block of detector pixels, each detector pixel being composed of a semiconductor element with a first face covered by a first armature and a second face covered by a second armature. The detector pixels are assembled side by side such that the first armatures define a detector plane. The first armatures are covered by a plane conducting structure that connects them together electrically. The detector does not have any dead area in which detection is impossible. The semiconductor is particularly applicable to detection of ionizing radiation (gamma rays, X-rays, etc.)

Detector with semiconductor for detecting ionizing radiation having a plane conducting structure

A micro gamma camera having several gamma radiation detection devices adjacent to each other. The detection devices are laid out above an information processing device that processes information output by the detection devices. Each of the detection devices includes: a plurality of detectors positioned adjacent to each other to form a detection plane; a first substrate including a detection plane polarizer and a first signal processor for processing the signal detected by the detection plane; a second substrate placed between the detection plane and the first substrate; a ground plane placed between the first and second substrates; and a third substrate including second and third signal processors.

Micro gamma camera with semiconducting detectors

A detection head and collimator for a gamma camera. The detection head includes several elementary detectors with semiconductors adjacent to each other to form a detection plane. The collimator is placed in front of the detection plane and includes a number of ducts laid out in a repetition pattern. The shape of the elementary detectors and the repetition pattern are rectangular in the detection plane.

Sensing head and collimator for gamma-camera

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.

Device and method for processing signals from a radiation detector with semiconductors

Process and device for real time sorting of detection events from a gamma ray detector and correction of the uniformity of detection elements from the detector

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.

Device and method for determining the assumed position of a phenomenon relative to a set of photodetectors, and application to gamma-cameras

A nuclear detection process and an apparatus therefore, including base potential correction and corresponding apparatus in which the base potential is measured by establishing a histogram of the values of the detected pulses and the value of the abscissa of the first peak of the histogram is determined and is subtracted from the values of the detected pulses.

Nuclear detection process with base potential correction and

A nuclear detection device, especially a gamma-camera type device which features deconvolution filters. In a gamma-camera variant, the device includes digital filters for deconvoluting electric measuring signals. A transfer function of these filters is opposite that of a circuit having formed the electric signals. It is then possible to separate any pulses which would overlap. Such a system finds particular application in nuclear physics and in particular in the medical field.

Nuclear detection device especially a gamma-camera type device, with

To take account of the decrease time constant of the intensity of the light scintillation and the statistical fluctuation of the scintillation, which is a resolution deterioration factor, it is appropriate to integrate the electric pulse resulting from the detection of an event by photomultiplier tubes. If, during this integration, a stacking phenomenon occurs, a second pulse is superimposed on the first and falsifies the calculation of the scintillation coordinates. This stacking is eliminated by validating the calculation of these coordinates by checking the value reached by the scintillation energy at the end of said integration. The value of this energy is measured by integrating the signal representing the intensity of the light scintillation.

Process and device for taking into account locating pulses supplied by a

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Corinne Mestais