An arrangement for generating X-ray radiation comprising an anode (9) formed as a part of a sphere. The arrangement further comprises at least one virtual focus element (4) which is adapted to emit generated photons to create the useful beam field. An arrangement according to the invention has a real focus which is larger than the previously known X-ray tubes and arrangements for generating X-raywith an inclined anode surface. Accordingly, an increased radiation amount per unit of time compared to previously known X-ray tubes is achieved by the arrangement according to the invention, provided that the acceleration voltage and the electron density for each anode surface unit are equal for both arrangements. The virtual focus element (4) can be adapted to a specific field of application. Time-and geometry-related imaging errors maybe avoided due to the high photon density and a focus which can be adapted to the requirements. When generating useful radiation using the arrangement according to the present invention, the photons are equally distributed in respect of mass and energy in the beam field, which makes it possible to achieve equivalent imaging conditions in the entire usefulbeam field.