1. A method for obtaining a 3D image reconstruction of an object, comprising: acquiring image data of the object by an X-ray device having an X-ray source and a flat-panel X-ray detector rotatable about a common axis at a plurality of angular positions about an axis of rotation, wherein a first part of the flat-panel X-ray detector receives X-ray quanta of X-ray radiation emitted from the X-ray source, wherein a second part of the flat-panel X-ray detector receives X-ray quanta of X-ray radiation emitted from the X-ray source which is different with the first part in a characteristic of the X-ray radiation, and wherein at least two angular positions of the plurality of angular positions are spaced 160° and 200° apart; generating a first 3D image reconstruction using image data obtained by the first part of the flat-panel X-ray detector; generating a second 3D image reconstruction using image data obtained by the second part of the flat-panel X-ray detector; generating the 3D image reconstruction using the first 3D image reconstruction and the second 3D image reconstruction.