Abstract: A process and osteodensitometry system using a dual-energy cone beam of X-rays is described. The system comprises an X-ray source capable of supplying a cone beam of X-rays with at least a first energy called the high energy and a second energy called the low energy, a two dimensional X-ray detector and electronic processor for processing images supplied by the detector. According to the process, a low energy image of a part of the anatomy of a patient, and a high energy image of the same part of the anatomy of a patient are acquired, and the images acquired at low energy and at high energy are matched before building up the map of bone densities of the part of the anatomy.

Abstract: The invention relates to a process for the formation of an image obtained from an array of detector pixels comprising at least one detector pixel, the image formed constituted by at least one set of P image pixels for each detector pixel, characterized in that it successively comprises: a stage (E2) making it possible to create N elementary pixels from one detector pixel, N being an integer equal to or lower than P and a stage (E3) of the random distribution of events received by a detector pixel in the N elementary pixels corresponding thereto. The invention applies to the field of medical imaging.

Abstract: In a radiography method with double energy conical beam, a preliminary calibration of the system involves using a device made up of blocks of different thicknesses of a first material, in stepped form here (1), composed of layers (2, 3, 4, 5), and which further comprises inserts (7) partly formed (12) of another material. A sufficient number of thickness combinations crossed by the radiation is obtained for each of the materials, while still producing scattered radiation resembling that of the subject, because of the similarity of the proportions and distribution of the two materials; a single digital method for estimation and correction for scattered radiation can then be applied.

Abstract: This radiography process utilizes dual-energy rays and comprises, in order to differentiate bone, lean and fatty tissues at the same time, an improvement consisting in assessing the total length penetrated by each ray while correcting the errors which may be produced by internal gas pockets. One proceeds as follows: selection of certain rays which have not penetrated bone tissues; calculation of the thicknesses of lean and fatty tissues penetrated by these rays according to the two attenuations, the sum of these two thicknesses being the length of attenuation; estimation of the length of attenuation elsewhere, in particular by means of interpolations; and calculation of the thicknesses of the three categories of tissues penetrated according to this total length of attenuation and the two attenuations.

Abstract: The radiography of a subject is improved by estimating the scattered radiation it transmits to the detectors. For this, one uses scattered radiation measured effectively through a simulacrum of the subject, with analogous attenuation properties, and which are modified by weighted coefficients obtained through a transformation of the values of total radiation received through the subject (3) and the simulacrum (8) selected. Thus it is also possible to improve radiographs without double irradiation of the subject to measure the scattered radiation separately.

Abstract: A process for improving a radiological examination and a device for implementing such a process.

Abstract: Process for use of an osteodensitometry system using dual-energy cone beam X-rays.

Abstract: In a radiography method with double energy conical beam, a preliminary calibration of the system involves using a device made up of blocks of different thicknesses of a first material, in stepped form here (1), composed of layers (2, 3, 4, 5), and which further comprises inserts (7) partly formed (12) of another material. A sufficient number of thickness combinations crossed by the radiation is obtained for each of the materials, while still producing scattered radiation resembling that of the subject, because of the similarity of the proportions and distribution of the two materials; a single digital method for estimation and correction for scattered radiation can then be applied.

Abstract: The radiography of a subject is improved by estimating the scattered radiation it transmits to the detectors. For this, one uses scattered radiation measured effectively through a simulacrum of the subject, with analogous attenuation properties, and which are modified by weighted coefficients obtained through a transformation of the values of total radiation received through the subject (3) and the simulacrum (8) selected. Thus it is also possible to improve radiographs without double irradiation of the subject to measure the scattered radiation separately.

Abstract: The present invention relates to a process for correcting scatter energy in which:using an X-ray and a first three-dimensional model of the object, a second model of the object is generated adapted to its geometry;the source energy spectrum is made discrete and an average density value is allocated to each zone of this object;primary energy is mapped;along the source-point tracklength of the primary energy map, a new average density value is determined for each of the zones and for each source-point tracklength of the detector;a coherent distribution coefficient and an incoherent distribution coefficient are obtained per energy, per tracklength and per zone;scatter energy is mapped;primary energy is mapped and an image of the object is obtained.