1. A method for reconstructing a three-dimensional image dataset of an object, comprising: recording a plurality of projection images for a recording geometry using different recording parameters by an X-ray apparatus, wherein the recording geometry is defined by a specified geometric position and orientation of an X-ray tube assembly and an X-ray detector of the X-ray apparatus; and reconstructing the three-dimensional image dataset from the projection images, wherein teh projection images are combined to form at least two combination images, wherein at least two reconstruction datasets are determined from the at least two combination images, and wherein the at least two reconstruction datasets are fused for reconstructing the three-dimensional images dataset.