Abstract:
This invention relates to a method of radiography of an organ of a patient, comprising: first vertical scanning and said second vertical scanning being performed synchronously, wherein a computed correction is processed on both first and second raw images, on at least part of patient scanned height, for at least overweight or obese patients, so as to reduce, between first and second corrected images, cross-scattering existing between said first and second raw images, and wherein said computed correction processing on both said first and second raw images comprises: a step (32, 33, 34) of making a patient specific modeling, using as patient specific data therefore at least both first and second raw images, preferably mainly both first and second raw images, more preferably only both first and second raw images, a step (34, 35) of determining a patient specific representation of radiation scattering by said patient specific modeling, a step (36) of processing said patient specific radiation scattering representation on both said first and second raw images so as to get said first and second corrected images.
Abstract:
A method for designing a patient specific orthopaedic device intended for an osteoarticular structure of a patient, based on at least two two-dimensional radiographic images of the osteoarticular structure taken respectively in two offset image-taking directions, comprising the following steps: b) locating anatomical points on the radiographic images; c) determining at least one three-dimensional geometrical feature of the patient by matching the anatomical points located at step b); d) determining at least one three-dimensional size parameter of the orthopaedic device based on the geometrical feature of the patient determined at step c).
Abstract:
The invention relates to a gas avalanche detector for detecting and locating X-ray or gamma ray ionizing radiation in radiographic imaging, the detector comprising: a gas enclosure (10) provided with an admission window (FE) for admitting a beam (FX) of incident X-ray photons; an intermediate plane electrode (12) placed in said gas enclosure (10) between two end plane electrodes (11, 13) and held parallel to the two end plane electrodes (11, 13); the configuration of the end plane electrodes (11, 13) and of the intermediate plane electrode (12) forming an amplification space (20), the amplification space (20) also constituting a conversion space in which the incident X-ray photons (FX) are convertible into electrical charges, the electrical charges being made up of primary electrons and of corresponding ions; the intermediate electrode (12) being operable at an electrical potential relative to the electrical potentials of the end electrodes (11, 13) suitable for generating an electric field that causes the primary electrons to be multiplied by the avalanche phenomenon in the amplification space (20) in the vicinity of the intermediate electrode (12); one of the end electrodes (13) being configured as a collector electrode for picking up the electrical signals induced by the ions; and said admission window (FE) being placed level with the amplification space (20) between the intermediate plane electrode (12) and said collector electrode (13) to admit said photon beam between the intermediate plane electrode (12) and said collector electrode (13). The invention also relates to a radiographic imaging device including such a gas detector.
Abstract:
Procédé d'imagerie radiographique pour la reconstruction tridimensionnelle dans lequel : 1) on repère des lignes de contour correspondant à des limites de l'objet, 2) on crée un modèle générique recalé, 3) on sélectionne des repères du modèle générique recalé dont les projections sur au moins une des images radiographiques sont les plus proches des lignes de contour repérées au cours de l'étape 1), 4) on définit une surface enveloppe ayant contribué à générer lesdites lignes de contour, 5) on détermine certains repères du modèle générique recalé, 6) on détermine la position géométrique de chaque repère, 7) on calcule la forme à trois dimensions d'un modèle représentant ledit objet.