Medical radiography requires specialist control of radiography equipment to achieve good imaging results. Typical errors that can occur consist of an inappropriate field of view being accidentally applied. This results in a “cropping effect” in which portions of the region of interest of a patient which would be of clinical use are omitted from the image. Conventionally, the only solution is to re-take the entire image with a more appropriate (and inevitably larger) field of view selected. This is undesirable, because it might require recall of the patient from another location, and the patient will be subject to two exposures, thus undesirably increasing their X-ray dosage. The present application proposes to use an anatomical atlas to analyse an X-ray image output from an initial exposure, in particular to assess whether significant anatomical elements are missing from the image. If elements are missing, the field of view of the X-ray imager is recalibrated, using collimation or pan/tilt adjustments, for example. A subsequent X-ray image is obtained, and combined with the initial image, to provide an output image. Because only a small area of the region of interest may subsequently need to be exposed, a smaller additional dose results.La radiographie médicale nécessite un contrôle spécialisé de l'équipement de radiographie pour obtenir de bons résultats d'imagerie. Des erreurs typiques qui peuvent se produire consistent en un champ de vision inapproprié qui est accidentellement appliqué. Il en résulte un "effet de recadrage" dans lequel des parties de la région d'intérêt d'un patient qui seraient à usage clinique sont omises dans l'image. De manière classique, la seule solution est de reprendre la totalité de l'image avec un champ de vision plus approprié (et inévitablement plus grand) sélectionné. Ceci est indésirable, étant donné qu'il pourrait nécessiter un rappel du patient depuis une autre localisation, et que le patient sera soumis à deux expositions, augmen
