1. A method for improved utilization of a radiation dose applied to an examination object during topogram scanning of a CT system with a system axis using a cylindrical curved multi-row detector, comprising: topogram scanning of the examination object with at least one emitter-detector combination disposed on a rotatable gantry from a rotation angle of the gantry, wherein during the topogram scanning a relative movement takes place between examination object and emitter-detector combination in the system axis direction; calculating at least one flat image, in at least two respective planes running in parallel to the system axis, by a tomosynthesis reconstruction; and at least one of storing and further processing at least one of the flat images of the examination object to represent a topogram.