Abstract: To acquire measurement data elements during a tomography type experiment in nuclear medecine, with a gamma camera having two detector heads, each of these heads is oriented on a sighting center P while the set of two heads rotates about a center of rotation Ia of the apparatus, the center of rotation being offset from the sighting center. It is shown that this approach provides speedier operation for the acquisition and also contributes to the preparation of tomography images that are more precise and more easily computed.

Abstract: To acquire measurement data elements during a tomography type experiment in nuclear medecine, with a gamma camera having two detector heads, each of these heads is oriented on a sighting center P while the set of two heads rotates about a center of rotation Ia of the apparatus, the center of rotation being offset from the sighting center. It is shown that this approach provides speedier operation for the acquisition and also contributes to the preparation of tomography images that are more precise and more easily computed.

Abstract: Improvements are made in the movements of a gamma camera, especially a gamma camera provided with two detector heads, by supporting each of these detector heads with a stirrup provided with two flanks. A bearing can slide within each of the flanks. This bearing holds a pin for the angulation and holding of the detector head. Each detector head can thus be shifted in translation independently, when the two bearings shift together and in the same direction in the flanks. It can furthermore accept a movement of angulation when it is rotated on itself, even about these axes. It is shown that this device improves the ergonomy of use and that it furthermore enables better-quality imaging.

Abstract: A scintillation camera is provided with multiple linearity correction maps which are accessed as a function of the value of the energy of a detected radiation event, so as to separately correct for spatial dislocation errors in multiple energy ranges as a function of detected position. The correction maps may be obtained by direct measurement of nonlinearities for each of the desired energy ranges individually, or sets of corrections for some energy ranges may be obtained by extrapolation calculation from correction factors which have been obtained by direct measurement.

Abstract: The disclosure relates to devices for medical imaging by gamma rays. In a device where a gamma camera is suspended from a supporting frame by a rotating stand, an arm and two pins enabling two movements of rotation of the detector head of the gamma camera with respect to the rotating stand, there is provided a stirrup connected to the arm by a third pin enabling a third rotational movement about this gamma camera. It makes it possible to facilitate the relative movement of the gamma camera and of the patient undergoing the examination.

Abstract: Gamma camera equipment of the invention has two detector heads capable of being associated for whole body type examination in which the two detector heads co-operate, or else of being separated for tomographic type examination, where only one of the heads is in use nevertheless continuing to be powered. In order to reinforce the mechanical cohesion of the assembly, the lower detector head is displaceable on rails which are fixed to the stand on which the upper head is mounted so that the stand constitutes a counterweight for the lower head, with struts being provided at the end of the rails only. The invention is particularly suitable for making compact multi-analysis equipment suitable for installation on any type of floor.