1. A method for reducing metal artifacts in CT image datasets, comprising: reconstructing a first CT image dataset without metal artifact correction; reconstructing a second CT image dataset with metal artifact correction; high-pass filtering the reconstructed first CT image dataset; high-pass-filtering the reconstructed second CT image dataset; low-pass-filtering the second CT image dataset; and weight summing the high-pass filtered reconstructed first CT image dataset and the low-pass and high-pass-filtered second CT image dataset, the weightings being dependent on proximity to metal in the first and second CT image datasets.