The paper presents an analysis of the different metal artefact generating effects in X-ray CT and discus3es several algorithmic approaches to reduce their influence. They all share a segmentation step in which the artefact-causing implants are automatically located in the more or less degraded original backprojected image and the subset of affected measurement data is identified. The original image is reconstructed from appropriately scaled ray data that permit a truthful display of implants and the proper assessment of their geometry. Algorithms discussed are simple data substitution by interpolation, data substitution by interpolation enhanced by reprojected high-contrast information and data correction by modelling of artefcat generating physical phenomena.
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Klotz et al. (1990) studied this question.