1. A method of generating a reconstructed projection image of an object, comprising: receiving, using at least one processing unit, measurement data representative of an interaction of x-rays with at least a portion of an object; receiving, using the at least one processing unit, a first volumetric dataset having a plurality of voxels with first voxel dimensions; selecting, using the at least one processing unit, a portion of the measurement data corresponding to data obtained from x-rays that are substantially parallel to a view direction of a projection image of the portion of the object; computing, using the at least one processing unit, a reconstructed second volumetric dataset having a plurality of voxels with second voxel dimensions using the first volumetric dataset and the selected portion of the measurement data; and generating, using a graphic unit, the projection image of the portion of the object along the view direction from the reconstructed second volumetric dataset.