1. A computed tomography method for determining a volumetric representation of a sample, comprising: reconstructing initial volume data of the sample from x-ray projections of the sample taken by an x-ray system; determining a part of the reconstructed initial volume data to be updated; and executing an iterative update process configured to generate, using an iterative re-construction method, updated volume data only for the part of the reconstructed initial volume data determined to be updated, wherein determining the part of the reconstructed initial volume data to be updated comprises individually evaluating every single voxel in the reconstructed initial volume data, based on available quality information for the reconstructed initial volume data, whether or not the voxel fulfils a predetermined condition indicating that an update is required for the voxel, and wherein the iterative update process generates updated volume data only for the voxels which have been determined that an update is required.