| Abstract: |
| Due to beam-hardening effects, metal objects in X-ray CT often produce streaking artefacts which cause degradation in image reconstruction. As demonstrated by Seo et al in 2017, the nature of the phenomena is nonlinear. An outstanding inverse problem is to identify the nonlinearity which is crucial for reduction of the artefacts. In this talk, we show how to use microlocal techniques to analyze the artefacts and extract information of the nonlinearity. In particular, we will discuss the interesting connection between the strength of artefacts and the geometry of metal objects. |
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