1. A method for generating a three-dimensional image dataset of a patient using an examination system having at least two image recording facilities, comprising: moving the image recording facilities in a z-direction by an operator panel; mounting the image recording facilities on a support for simultaneously rotating the image recording facilities about axes of rotation; recording a plurality of two-dimensional images in a plurality of orientations by the image recording facilities while rotating and moving the image recording facilities; reconstructing a plurality of three-dimensional sub-image datasets from the two-dimensional images recorded by the image recording facilities; and combining the three-dimensional sub-image datasets with each other to generate the three-dimensional image dataset for an examination of the patient, wherein the z-direction is a longitudinal direction of the patient, wherein a recording area of the examination system comprises a plurality of recording areas of the image recording facilities, and wherein the recording areas of the image recording facilities are offset in the z-direction and supplement each other.