Abstract: A method and system of forming an X-ray layer image of an object being examined by an X-ray device having an X-ray source and an X-ray detector is described. At least one of the X-ray source and the X-ray detector can be displaced in an angular range around the object in order that X-ray projection images are acquired from different directions. When forming only a single X-ray layer image, or a plurality of X-ray layer images of parallel layers of the object, the time required for the acquisition of the X-ray projection images is notably reduced by forming the X-ray layer image directly from the X-ray projection images, where the resulting X-ray layer image is situated in a plane which extends essentially perpendicularly to the bisector of the angular range of displacement. The angular range of displacement can be less then 180°. The system and method is notably applicable to a C-arm X-ray device, in which the angular range can be chosen at will.

Abstract: The invention relates to a method of forming an X-ray layer image of an object (9) to be examined by means of an X-ray device which includes an X-ray source (2) and an X-ray detector (3); the X-ray source (2) and the X-ray detector (3) are displaced in an angular range (14) around the object (9) to be examined in order to acquire X-ray projection images from different directions. When only a single X-ray layer image is to be formed, or a plurality of X-ray layer images of parallel layers (S1, S2) of the object (9) to be examined, in accordance with the invention it is possible to reduce the expenditure required, notably the time required for the acquisition of the X-ray projection images, by forming the X-ray layer image directly from the X-ray projection images, the X-ray layer image being situated in a plane which extends essentially perpendicularly to the bisector (20) of the angular range (14), the angular range (14) amounting to less then 180°.