Abstract: In a radiographic method where an object (2) is studied in several steps by a radiation (4) occupying various positions (4i, 4j) just as the associated network of detectors (3i, 3j), the combination of elementary vignettes into an overall image without junction defects is resolved by a discretisation of the object (2) into volumes and a calculation of the attenuation in each volume (voxel) (8) to obtain images of the object at different reconstruction heights; then said images are combined with each other to obtain a final, more exact image.

Abstract: The invention relates to a method for x-ray examination of an object where two categories of materials are taken into consideration, comprising: the use of broad spectrum x-rays; measurements of the x-rays by bands of the spectrum; expressions ({circumflex over (M)}) of thicknesses or masses of the two categories of materials passed through by the x-rays, the expressions ({circumflex over (M)}) being functions of at least two of the measurements (mesk) and coefficients (A); and applying a selection criterion from among the expressions ({circumflex over (M)}) to deduce from this an expression (final {circumflex over (M)}) considered true; characterized in that the selection criterion comprises a combination (f) of the expressions with weighting factors (a), and a calculation of the weighting factors such that the combination has minimal variation according to variations of the measurements.

Abstract: The invention relates to a method for x-ray examination of an object where two categories of materials are taken into consideration, comprising: the use of broad spectrum x-rays; measurements of the x-rays by bands of the spectrum; expressions (M?) of thicknesses or masses of the two categories of materials passed through by the x-rays, the expressions (M?) being functions of at least two of the measurements (mesk) and coefficients (A); and applying a selection criterion from among the expressions (M?) to deduce from this an expression (final M?) considered true; characterized in that the selection criterion comprises a combination (f) of the expressions with weighting factors (a), and a calculation of the weighting factors such that the combination has minimal variation according to variations of the measurements.

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: 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: 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: 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: 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.