Abstract: An antiscattering grid for a radiation imaging apparatus is disclosed. The antiscattering grid having a plurality of strips substantially absorbing X-rays and separated from each other by inter-strip spaces substantially transparent to the X-rays. The dimensions of apertures separating two successive strips among the plurality of strips is not constant.

Abstract: In an apparatus for radiographic projection tomography, particularly mammography, an X-ray tube is mounted at the end of a swiveling arm, with a relative movement mechanism. The relative movement mechanism is such that it enables the tube to follow a path of a cycloid. Images or exposures taken only during the time when the tube, in its path, follows cusp points such that it is possible to keep a constant speed of movement of the arm while at the same time increasing the useful duration of an image. Vibration or oscillation effects inherent in the apparatus are compensated by the positioning, if necessary, of a counterweight.

Abstract: An antiscattering grid for an X-ray imaging apparatus of the type comprising a substrate having a plurality of metallized partitions which together define a plurality of cells distributed over the substrate. The partitions allow passage of the X-rays emitted from a source lying in line with the grid, and absorbing the X-rays not coming directly from this source. The substrate is made of a polymer material that may be formed by radiation curing of a monomer sensitive to this radiation. The substrate may be substantially planar and the partitions may be oriented to form a focused grid.

Abstract: Method and apparatus for adjustment of the entrance dose of a radiology apparatus of the type containing a means of X-ray beam emission, a means of detection of the X-ray beam after it has crossed an object having to be visualized, and a means of visualization connected to the means of detection, in which the distance between the means of emission and the object is estimated and, when the distance between the means of emission and the object or the distance between the means of emission and the means of detection varies, the entrance dose is modified according to said distances in order to maintain an appreciably constant equivalent dose in the plane containing the object, the distance between the means of emission and the means of detection being known.

Abstract: A method and apparatus for determining a set of functional parameters using a fluoroscopic radiography apparatus of the type comprising an X-ray source, a detector or recorder of the radiation facing the source, the source and the detector or recorder being installed on a mobile support capable of movement with respect to a table placed between the source and the detector or recorder on which a patient with a region of interest to be X-rayed will be placed. The method comprises a) movement of the support following a given movement with respect to the table, repeated during a given time; b) acquisition by the detector or recorder of a series of images of the region of interest during movement of the support with respect to the table; c) reconstitution of a series of three-dimensional models of the region of interest, starting from a series of acquired images; and d) determination of all functional parameters.

Abstract: A method and apparatus for using a tomography to facilitate the placement of an instrument in a vessel or in an organ of a patient's body wherein a specific or selected region of the patient is defined. X-ray radiation is projected onto the selected region, the X-ray radiation being emitted by the X-ray source of the apparatus. The radiation transmitted to a detector of the apparatus is measured, the detector being positioned in line with the X-ray source. The signals of the selected region are measured by the detector and transmitted for acquisition that stores the image. The acquired signals for the image are transmitted to a display in order to display a projected image of the selected region of the patient in a plane parallel to the longitudinal axis of the patient, such that the time interval between measuring the radiation and displaying the radioscopic image is short enough to allow the instrument to be guided in the patient's body in “real-time”.

Abstract: An antiscattering grid for a radiation imaging apparatus having a plurality of strips substantially absorbing X-rays and separated from each other by inter-strip spaces substantially transparent to the X-rays, the dimensions of apertures separating two successive strips among the plurality of strips carrying along an axis passing through at least three strips among the plurality of strips.

Abstract: In an apparatus for radiographic projection tomography, particularly mammography, an X-ray tube is mounted at the end of a swiveling arm, with a relative movement mechanism. The relative movement mechanism is such that it enables the tube to follow a path of a cycloid. Images or exposures taken only during the time when the tube, in its path, follows cusp points such that it is possible to keep a constant speed of movement of the arm while at the same time increasing the useful duration of an image. Vibration or oscillation effects inherent in the apparatus are compensated by the positioning, if necessary, of a counterweight.

Abstract: A method of fabricating an antiscatter grid, an antiscatter grid element and the antiscatter grid formed by the method comprising: forming grid elements by covering portions of at least one substrate with strips made of a radiation absorbent material wherein the portions of the substrate are dimensioned with a width greater than the width of the strips made of the absorbent material. The grid elements are superimposed. Pressing or grasping the superimposed grid elements at least on the parts of the element not covered with the absorbent material. The elements can be formed on a single substrate or on strips of substrate each one supporting a strip made of the absorbent material.

Abstract: A method and apparatus for determining a set of functional parameters using a fluoroscopic radiography apparatus of the type comprising an X-ray source, a detector or recorder of the radiation facing the source, the source and the detector or recorder being installed on a mobile support capable of movement with respect to a table placed between the source and the detector or recorder on which a patient with a region of interest to be X-rayed will be placed. The method comprises a) movement of the support following a given movement with respect to the table, repeated during a given time; b) acquisition by the detector or recorder of a series of images of the region of interest during movement of the support with respect to the table; c) reconstitution of a series of three-dimensional models of the region of interest, starting from a series of acquired images; and d) determination of all functional parameters.

Abstract: An anti-scatter grid for radiology imaging having an anti-scatter layer with a plurality of metallized partitions that enable X-rays emitted from a source located above the grid to pass and absorbing X-rays not derived directly from this source. The grid has at least one plate of expanded polymer material fixed on one surface of anti-scatter layer. The grid may be positioned with a frame.

Abstract: A system comprising a plurality of apparatus, each equipped with at least one central unit including an internal clock, the internal clocks being synchronized. At least two of the apparatus receive signals and synchronize their respective internal clock with the signals. The signals can be a radio signal that can be from a satellite, such as a global positioning system. The apparatus may be an imaging apparatus or other devices used in medical technology.

Abstract: A method of fabricating an antiscatter grid, an antiscatter grid element and the antiscatter grid formed by the method comprising: forming grid elements by covering portions of at least one substrate with strips made of a radiation absorbent material wherein the portions of the substrate are dimensioned with a width greater than the width of the strips made of the absorbent material. The grid elements are superimposed. Pressing or grasping the superimposed grid elements at least on the parts of the element not covered with the absorbent material. The elements can be formed on a single substrate or on strips of substrate each one supporting a strip made of the absorbent material.

Abstract: An antiscattering grid for an X-ray imaging apparatus of the type comprising a substrate having a plurality of metallized partitions that together define a plurality of cells distributed over the substrate. The partitions allow passage of the X-rays emitted from a source lying in line with the grid, and absorbing the X-rays not coming directly from this source. The substrate is made of a polymer material that may be formed by radiation curing of a monomer sensitive to this radiation. The substrate may be substantially planar and the partitions may be oriented to form a focused grid.

Abstract: In a system of X-ray diagnosis for angiographic examinations, the passage of a contrast medium is detected by its physiological effects such as the rise in the temperature of the cutaneous tissues, by means of thermocouples positioned on the patient's body. The signals from the thermocouples are processed in a device which gives forward motion signals for a panel supporting the patient and signals for triggering the shooting in such a way that the radiological image includes an image of the contrast medium.

Abstract: In a method for interactive adjustment of the parameters of a gray-scale window in a system for reproduction of a digitized image such as an x-ray image, one of the parameters designated as the mean-level parameter is modified at the instant of each elementary control action by a computed value of the other parameter designated as the width parameter.

Abstract: A radiological installation with dynamic compensation in the optical path of the image, with an optical attenuator with locally adjustable transmission placed at least in the vicinity of a focal plane in which the radiological image is formed situated upstream of the television camera of the image acquisition chain.

Abstract: A method is disclosed for eliminating the diffused radiation in a radiology image. The method fundamentally consists in interposing a mask comprising a finite number of areas absorbent to X-rays between the X-ray source and the object which is to be examined, in detecting the corresponding fundamental image in order to deduce from the areas of the same which correspond to the parts eliminated from the beam a distribution of the diffused radiation throughout the image, and in correcting the fundamental image based on this distribution. The method is particularly applicable to medical radiology.

Abstract: Installation allowing the adjustment of compensating filters without exposure to permanent irradiation. According to one possible embodiment, a radiological image is taken (source, brightness or luminance amplifier) and memorized in an image memory prior to being projected by the video projector onto the patient by through-crossing the filter, this filter having brightness absorption and X-ray absorption properties which are similar.

Abstract: A method and apparatus for positioning a patient with respect to an X-ray installation. An X-ray image is produced at the beginning of the operation and stored in an image memory. The memory is read in order to visualize the X-ray image on a television receiver. The table is displaced to a desired position, and the image in the receiver is decentered so as to reproduce the image that would be observed if an X-ray were taken at the desired position.