| Patent Number |
Title Of Patent |
Date Issued |
| 5528649 |
Method of calibrating a radiological system and of measuring the equivalent thickness of an obje |
June 18, 1996 |
| The calibration method consists in measuring the efficiency D of a detector cell placed behind the object as a function of various phantom thicknesses E.sub.p and various X-ray tube supply voltages V.sub.m. These measurements enable an analytic model D=f(V.sub.m, E.sub.p) to be determine |
| 5412763 |
Method for displaying an image of a portion of the inside of a three-dimensional physical struct |
May 2, 1995 |
| In order to display a portion of a physical structure on a screen, an intermediate "pointer" memory is created. The addresses of memory words in the pointer memory correspond to the coordinates of pixels on a display screen, or in equivalent manner to the corresponding addresses of memor |
| 5363113 |
Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a |
November 8, 1994 |
| By associating an open conductive shield with a radiating loop, it is possible to limit transmission of the electric field for the benefit of transmission of a magnetic field alone. It is shown in particular in the nuclear magnetic resonance imaging field that the antenna becomes less |
| 5347563 |
Method for determining the function representing the effect of non-reciprocity of a radiographic |
September 13, 1994 |
| The invention relates to radiology systems and, more particularly in such systems, to a method that enables the effect of non-reciprocity of the radiographic film to be determined. This effect of non-reciprocity is expressed by coefficients CNRD(d.sub.i) which are a function of the photo |
| 5345632 |
Underframe for medical examination table |
September 13, 1994 |
| A medical examination table comprises a pedestal to which an end of a rocker is hinged. An underframe is fixed rotationally to the other end of the rocker. By acting on the two axes of rotation, the table may enable motions that are as different as a simple raising motion and tilting |
| 5336880 |
Process for the correction of distortions in radiological images |
August 9, 1994 |
| Process to correct distortion of radiological images by obtaining the image of a regular test chart and assessing the distortions to which the image is subjected. This assessment is used to correct normal images obtained with the installation. One obtains automatically the distortion |
| 5303283 |
X-ray unit with high-voltage power supply device integrated into the casing |
April 12, 1994 |
| An X-ray tube is enclosed in a casing containing a cooling fluid. At least one terminal part of the casing is elongated to house a high-voltage power supply device comprising a high-voltage output terminal connected to the anode and/or the cathode and low-voltage input terminals connecte |
| 5297188 |
Device for the marking of information elements |
March 22, 1994 |
| An x-ray identification module includes a strip having recesses formed in opposite surfaces thereof. An opaque x-ray marker is received within one of the recesses, and a lateral strip portion is defined adjacent each recess. At least two suction cups are mounted to the lateral portion |
| 5297036 |
Method for the correction of the measurements of optical density made on a radiographic film |
March 22, 1994 |
| To carry out an automatic processing operation on radiographic images in mammography, it is shown that it is possible to correct the harmful effects of the linearity defect of the characteristic curve of sensitivity of the radiographic film used for this radiograph by making a statistica |
| 5287274 |
Method for acquisition of radiological data in multiple orthogonal orientations using a 2D detec |
February 15, 1994 |
| In voludensitometry and in cases in which it is necessary to acquire only a small number of views, the artifact ratio resulting from reconstructions is reduced. There is acquired at least one view of the object to be reconstructed, the principal direction of irradiation of which is orien |
| 5285492 |
Safety device in a radiology machine |
February 8, 1994 |
| A safety device for an X-ray unit comprises an X-ray tube protected by a casing and cooled by a fluid circulating between the tube and the casing. This device is aimed at preventing any excess pressure of the cooling fluid in the casing. It comprises a rigid, hermetically sealed and |
| 5265149 |
Anti-toppling mobile radiology stand with restrictive unfolding |
November 23, 1993 |
| A mobile radiology machine that meets anti-toppling standards is made by limiting the unfolding of the structure that holds the X-ray tube, so that this unfolding occurs as a function of the angle of orientation of this structure about a vertical axis of exploration. It is shown that, un |
| 5257304 |
High-voltage power device and power pack for X-ray tube |
October 26, 1993 |
| In a high-voltage power device for X-ray tubes, a single magnetic circuit is used to couple a primary circuit to two separate secondary circuits. Each of these secondary circuits comprises a series of secondary windings, each connected to a rectifier-doubler circuit constituted by diodes |
| 5245539 |
Stereographic X-ray examination system including graphic screen means for generating index marks |
September 14, 1993 |
| A light box for X-rays is made by using a graphics screen (20) coupled to a microprocessor (23), with the screen being used with inverse brightness. Under these conditions, the graphics screen emits light at nearly all points, other than special locations (I.sup.25) whose positions can b |
| 5245538 |
Process for representing views of an object |
September 14, 1993 |
| The segmented object is represented in terms of a numerical volume by calculating the gradients of the physical quantities loaded into the volume elements of this numerical volume. The gradients are shown to be perpendicular to the true surface of the object to be segmented and that |
| 5243509 |
Variable frequency resonant converter |
September 7, 1993 |
| Disclosed is a device to obtain a DC voltage V.sub.p that is adjustable in a wide range of values. To a rectifying and filtering circuit, there are applied AC pulses. The quantity of electricity of these AC pulses is constant for each pulse, and their frequency F varies as a function of |
| 5241471 |
Method of multi-scale reconstruction of the image of the structure of a body at an increased spe |
August 31, 1993 |
| In order to reconstruct the structure of a body by way of iterative algorithms, the first iterations are carried out with lower resolution in order to limit the number of calculations. The image can then be reconstructed when the calculation time is reduced to one-third or even one-q |
| 5233516 |
Method for recording movements inside an object and for showing on an image display the effects |
August 3, 1993 |
| In an NMR experiment, the movements of an object are represented by carrying out a harmonic analysis of the images based on a resolution of the movement of the object into a Fourier series. There is then obtained a set of images which is representative of the Fourier components of this |
| 5224592 |
High voltage switch device and high-voltage change-over switch |
July 6, 1993 |
| The disclosure relates to high-voltage change-over switches that are used to apply high voltage alternately to two X-ray tubes. Each of the four switch devices constituting a change-over switch includes a fixed contact element connected to an input terminal of the high voltage and a mova |
| 5224143 |
Dihedral deflection cathode for an X-ray tube |
June 29, 1993 |
| The invention relates to X-ray tubes. The cathode for an X-ray tube has two filaments associated with a deflecting and focusing device which comprises at least three metal parts which are electrically insulated from one another and which are raised to electrical voltages. First and secon |
| 5222201 |
Method for displaying a portion of the body |
June 22, 1993 |
| The problems of selection of objects having complex shapes and usually apprehended by a plurality of facets are solved by making use of curved surfaces, the equation of which is of the second degree. In a test calculation for checking whether a node of an octree decomposition does or |
| 5222021 |
Method to correct the measurement of the bone density in a scanner using a calibration phantom h |
June 22, 1993 |
| The disclosure concerns X-ray scanners and, more particularly, a method to measure the bone density of a patient that takes his or her build into account. The disclosed method consists in performing a calibration of the bone density measurement by means of a phantom that simulates the |
| 5218625 |
Method for the automatic determination of the exposure time of a radiographic film and system of |
June 8, 1993 |
| The disclosure concerns radiology instruments that include an X-ray source, a receiver of the film or film-screen type, a detection cell and means to compute the yield at the cell. The method consists of performing measurements of the yield at instants t.sub.1, t.sub.2, . . . t.sub.3 |
| 5218534 |
Method of computation and processing of the image in conical projection, of a sampled three-dime |
June 8, 1993 |
| In order to carry out a three-dimensional reconstruction of an object acquired by a series of conical projections on a two-dimensional multidetector, the object is estimated by a sampled function. The sampled function is projected and the projections of the sampled function are compa |
| 5216600 |
Method for eliminating parasitic noise in an x-ray scanner |
June 1, 1993 |
| A method for elimination of parasitic noise in an x-ray scanner consists of computing the mean value of the signals of the ten first views in a circuit (26). This mean value is subtracted from the signals of the first view V.sub.1 in a circuit (27) so as to obtain the high-frequency |
| 5214578 |
Method and system for the calibration of an x-ray scanner using an off-centered circular phantom |
May 25, 1993 |
| A method and system to calibrate an X-ray scanner uses a single circular phantom. The circular phantom is off-centered with respect to the axis of rotation of the scanner so as to introduce different paths in the phantom for each channel, depending on the angular positions of the scanner |
| 5208533 |
NMR machine with low field and dynamic polarization |
May 4, 1993 |
| Problems of homogeneity of the resonant field of an NMR machine are solved by differentiating the polarization and resonance functions assigned to coils of the field of said machine. In order to produce a magnetization, use is made of a polarization coil which produces a high field. This |
| 5206892 |
Device for the shielding of a motor stator for the rotating anode of an X-ray tube |
April 27, 1993 |
| In X-ray tubes with a rotating anode, the shielding of the stator is obtained by a first conductive layer that is deposited on the external wall of an insulating bell-shaped part and has an electrical discontinuity, and by a second conductive layer that is deposited on the internal w |
| 5200984 |
Filament current regulator for an X-ray tube cathode |
April 6, 1993 |
| The disclosure relates to devices for supplying current to X-ray tube cathode filaments. The filament of a cathode is supplied with high-frequency current pulses given by a hyporesonant type DC/AC converter, the transistors of which are controlled by a regulation circuit. This regula |
| 5200645 |
Device for obtaining and switching high voltages applied to X-ray tube electrodes |
April 6, 1993 |
| Disclosed is a device that can be used to obtain voltages for the biasing of the electrodes used to deflect the electron beam emitted by a cathode of an X-ray tube. Four DC voltages .+-.V.sub.1 and .+-.V.sub.2 are generated and applied to a mixing circuit in which they are added by using |
| 5197604 |
High-voltage change-over switch with linear movement |
March 30, 1993 |
| A change-over switch comprises four input terminals connected in pairs to one of the two poles +HT and -HT of a high voltage generator and four output terminals connected in pairs to one of two X-ray tubes. It includes two identical half change-over switches with coupled control, each ha |
| 5195120 |
Method, tube and system for eliminating a fixed antiscatter grid in a radiological image |
March 16, 1993 |
| In a radiological apparatus using an antiscatter grid, this grid is kept fixed instead of being movable, and its image is removed by irradiating it as well as the object to be examined by two X-ray sources that have to be separated by a distance b determined by the first zero of the modu |
| 5189602 |
High-voltage generator with selective half-bridge and full-bridge operation |
February 23, 1993 |
| An assembly is made enabling an inverter of a high-voltage generator to pass from a full-bridge use to a half-bridge use, in replacing a connection circuit of a mid-point of a first rectifier of this generator at a mid-point of the inverter by a circuit that is frequency controlled a |
| 5185775 |
X-ray apparatus including a homogenizing filter |
February 9, 1993 |
| The invention applies to radiological apparatuses for angiographic examination. The invention lies in the fact that an X-ray attenuation filter is disposed between the X-ray source and the patient, said filter introducing attenuation on the path of each X-ray such that the total atte |
| 5175773 |
Method of three-dimensional reconstruction of arborescence by labeling |
December 29, 1992 |
| In order to reconstruct an angiographic arborescence, two images are acquired according to orientations substantially perpendicular to each other of an arborescence (IVA,CX) to be reconstructed. By a follow-up operation of the segments, the coordinates of the arborescence segments ar |
| 5174298 |
Imaging process and system for transillumination with photon frequency marking |
December 29, 1992 |
| In an imaging process and system by transillumination of a medium illuminated by transparency by a beam, an acoustic transducer emits an acoustic wave in the medium which interferes with the beam. The frequency of the light passing through the medium is then shifted from the value of |
| 5166969 |
Method for the estimation and calibration of the lumination received by a radiographic film |
November 24, 1992 |
| The invention concerns radiology systems and, more particularly, in such systems, to a method to determine and calibrate the lumination (namely the quantity of light received multiplied by the exposure time) received by the radiographic film in order to obtain a given blackening of the f |
| 5155755 |
Anode for X-ray tubes with composite body |
October 13, 1992 |
| The disclosure pertains to X-ray tubes and, more particularly, in these tubes, it pertains to rotating anodes. The disclosed anode for an X-ray tube has a body or substrate on which a target is formed by a layer of target material, wherein the body comprises at least two parts formed by |
| 5154638 |
High-voltage connector for an X-ray tube |
October 13, 1992 |
| A high-voltage connector, in particular for feeding the cathode, two cathode filaments, and two gates of an X-ray tube, wherein the connector comprises five connections, one for power supplying the cathode, two for power supplying the cathode filaments, and the last two for power sup |
| 5149074 |
Patient support having a long range of vertical displacement |
September 22, 1992 |
| The vertical displacement of a patient support table for a radiology apparatus is obtained by means of an electromechanical device constituted by arms which are connected to each other and to the support table by means of powered articulations with synchronized movements of rotation. A |
| 5148466 |
Device for installing mammography cartridges of different formats |
September 15, 1992 |
| An X-ray apparatus includes a moving carriage having two levers hinged and designed to move equally and in opposite directions by a gear system. The movements of the levers are guided by at least one groove formed in a supporting plate, with a peg fixed to the lever co-operating with the |
| 5138645 |
Anode for X-ray tubes |
August 11, 1992 |
| The disclosure concerns anodes for X-ray tubes. The disclosed anode for an X-ray tube has a body or substrate on which a target is provided by a layer of target material, wherein said anode comprises at least one layer that is interposed between said substrate and said target layer and i |
| 5126672 |
Method for the measurement of the effects of eddy currents |
June 30, 1992 |
| A measurement is made of the effects of eddy currents during a long period (TM) in an NMR machine by placing, in this machine, a probe possessing a material capable of magnetic resonance with a small spin-spin relaxation time, and by proceeding to make a reiteration (PR) of the electroma |
| 5125020 |
Anode for X-ray tube with high mechanical strength |
June 23, 1992 |
| The apparatus is an anode for an X-ray tube which is rotated at high speeds during operation. The anode include a plate of refractory material with high mechanical strength. On both faces of the plate are fixed two blocks of light weight refractory material. One of the blocks is formed o |
| 5125019 |
X-ray scanning tube with deflecting plates |
June 23, 1992 |
| In an x-ray tube of the beam deflection type for a radiology apparatus, the stair-steps of the focusing device of the electron beam are extended by metallic deflecting electrodes placed in parallel relation to said stair-steps and electrically insulated from these latter by means of |
| 5123084 |
Method for the 3D display of octree-encoded objects and device for the application of this metho |
June 16, 1992 |
| The 3D display device of the invention is based on an octree structure of data pertaining to an object to be displayed. This structure is memorized in a memory associated with a cache memory sending blocks of data on a bus to which a geometrical processor and an image-generating circuit |
| 5123037 |
Method for calibrating the measuring system of an X-ray apparatus |
June 16, 1992 |
| In order to represent the bone structure of a patient's body, acquisitions are made with different irradiation energies. The irradiations are compared with these two energies in order to deduce a two-dimensional projected image which is representative of the bone structure alone. To |
| 5117448 |
Weight compensation device for X-ray tube comprising passive magnetic bearings |
May 26, 1992 |
| In an X-ray tube wherein the rotor is supported by passive magnetic bearings, the respective positions of which are such that the rotor is offset in the direction opposite that of the anode, the bearings are mounted on an elastic system which has the effect of compensating for the ax |
| 5111492 |
X-ray diagnosis system for angiographic examination with device for the automatic tracking of a |
May 5, 1992 |
| 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 therm |
| 5109860 |
Probe with curved bar for an echograph |
May 5, 1992 |
| A curved bar probe (1) for an echograph is fabricated by using a thin support (2) on which is placed a bar of piezoelectric crystal. The bar is divided into a plurality of piezoelectric transducers elements (3). The thin support presents the particularity of being rigid at room temperatu |
