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Beam Hardening Artifacts
Common ways to correct for these artifacts consist in:
- Segmenting the metal or high attenuating objects in the image (which are the main
responsible of the artifacts, since the inhomogeneity in the absorption due to the energy
is maximum when highly attenuating objects are met).
- Identifying all the affected projections, i.e. those projections that have passed throught
these objects.
- Replacing the affected projection with some sort of interpolation of the non-affected
adjacent ones.
These types of algorithms are normally iterative: small improvements are done in each
iteration, until a cost function is minimized.
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