Stereo projections of breast tissue to be examined are dynamically generated with the aid of an x-ray projection machine. An x-ray source of the x-ray projection machine is moved to a start position. Thereupon, an x-ray projection recording is started at the start position and the x-ray projection recording is performed while the x-ray source moves to a finish position. The position of the x-ray focus is updated during the x-ray projection recording so that a change in position of the x-ray focus is compensated for at least in part, preferably in full. The x-ray projection recording is terminated when the finish position is reached. A method for ascertaining a position of breast tissue to be examined and an automated method for planning a biopsy are described. An x-ray source control device and an automated stereotactic biopsy machine are described.
