1. A method for contrast-enhanced imaging of an object by an imaging device having a movable radiation source, which comprises the steps of: recording a first projection image sequence of the object along a first trajectory over which the movable radiation source moves, by means of radiation having a first energy spectrum; recording a second projection image sequence of the object along a second trajectory over which the movable radiation source moves, by means of the radiation having a second energy spectrum, the first and second energy spectra being different energy spectra; reconstructing a three-dimensional subtraction image in relation to the different energy spectra by means of the first and second projection image sequences; reconstructing at least one two-dimensional subtraction image in relation to the different energy spectra with an aid of the first and second projection image sequences; and providing the three-dimensional subtraction image together with the at least one two-dimensional subtraction image for an analysis of object characteristics.