Abstract: The invention relates to a fluidized medical bed.According to the invention, the receptacle (3) of this bed comprises: a lower wall (4); a porous bottom (5) disposed close to the lower wall, covered by a layer of granular constituents (22) and formed in several parts, the upper surfaces of which are inclined towards a waste collector (6, 7) which comprises a reservoir placed below the porous bottom, connected to the lower part of one of said parts (5) of the porous bottom, and comprising a first part (6) fast with the porous bottom, terminated by a shut-off valve (10) provided with a first leakproof coupling (8), and the second part (7) detachably fixed to said coupling (8).The invention finds an application in the production of a medical bed which is inexpensive to use.

Abstract: The invention provides a method and device for forming images by nuclear magnetic resonance in which an image is constructed by discrimination of the intrinsic parameters of the tissues examined. The image is formed by putting forward the degrees of attachment and mobility of the nuclei of the tissues. The parameters displayed represent the field heterogeneities at the microscopic and molecular levels. The method consists in acquiring a first image using conventional methods then, after slightly varying the orientater magnetic field, in acquiring another image using the same methods. Then an image of another type is formed by representing the relative variations of the relaxation times between this first and this second image.

Abstract: The invention relates to a method for processing locating pulses supplied by a gamma camera and to a gamma camera utilizing this method. In accordance with the invention, locating pulses (X.sup.+,X.sup.-,Y.sup.+,Y.sup.-) are taken into account by a calculator circuit (12) which performs the standardization of an (X,Y) coordinate signal proportional to the difference of two locating pulses (X.sup.+ -X.sup.-) along an axis by the sum of these same two locating pulses (X.sup.+ +X.sup.-) along this axis.

Abstract: In a gamma camera utilizing a collimator, a scintillator, a network of photomultiplier tubes and an array of matrices of resistors, the balanced pulses supplied by this array are measured by integration in an integrator stage which supplies locating pulses. These locating pulses serve the purpose of generating coordinate signals applied to a visual display device. Prior to integration, the direct interference components affecting the balanced pulses are eliminated by capacitive coupling of the array of matrices to the integrator stage. In order to prevent this coupling introducing means direct components at high counting rates, the output of this coupling means is periodically forced to assume the value of a base potential.

Abstract: The invention relates to a hybrid scintillation scanning apparatus. Said apparatus comprises: a scintillation crystal bar of elongated form receiving the gamma radiation through a collimator and comprising a transparent upper face optically coupled by means of a light guide to a plurality of photomultipliers. The photomultipliers furnish their signals to an electronic combining circuit supplying, on one hand, an amplitude analyzer and, on the other hand, a computing circuit permitting the location of the scintillation along the axis of the bar.