X-RAY IMAGING METHOD AND APPARATUS TO REDUCE X-RAY EXPOSURE OF SUBJECT REGIONS OTHER THAN THE DIAGNOSTICALLY RELEVANT SUBJECT REGION

In a method for operating an imaging apparatus, and an imaging apparatus that has an x-ray source with a focus and a measurement volume with a central axis around which measurement volume the focus can be moved, acquisition of x-ray projections of a measurement subject that is arranged eccentrically relative to the central axis in the measurement volume are produced. The segment of the measurement volume in which the measurement subject is arranged is established based on an overview image and the projection angle range Δα in which x-ray projections should only be acquired in order to be able to reconstruct at least one image of the measurement subject is determined based on the establishment of the segment of the measurement volume.