| abstract |
A computed tomography method for determining a volumetric representation of a sample (13) comprises an initial reconstruction step (22) for reconstructing initial volume data (23) of the sample (13) from x-ray projections (21) of the sample (13) taken by an x-ray system (10), a step (24) of determining a part of the reconstructed initial sample volume to be updated, and an iterative update process (32) for generating, using an iterative reconstruction method, updated volume data (23) only for the part of the volume data (23) determined to be updated. The method comprises, in said step (24) of determining the part of the sample volume to be updated, individually evaluating for every single voxel in said volume data (23), based on available quality information for the reconstructed volume data (23), whether or not this voxel fulfils a predetermined condition indicating that an update is required for this voxel, and, in said iterative update process (32), generating said updated volume data (23) only for those voxels for which it has been determined that an update is required. |