1. An imaging tomosynthesis system, comprising: an emitter/detector system for scanning an examination object from a plurality of projection angles and configured for generating tomosynthetic image data of the examination object; a computer system including at least one display unit and a storage medium for storing program code configured, during operation, to execute the following method: generating x-ray projections of the examination object by way of the emitter/detector system from a plurality of projection angles, which are suitable for generating tomosynthetic image data from density values of the examination object; reconstructing a stack of tomosynthetic slice image data, which respectively extend in a plane through the examination object and which correspond to slices at different levels perpendicular to the respective plane, from the x-ray projections; generating an overview image of density values of the examination object from the tomosynthetic representations; selecting respectively one characteristic density value in the stack at at least one plane position of the tomosynthetic slice images; determining a level of the at least one selected characteristic density value; and displaying the overview image of the density values on the at least one display device and simultaneously displaying the level of the at least one characteristic density value as a color value correlated to the level.