Measurement only, measurement and modelling, modelling only? Built into the iterative reconstruction algorithm or a scatter field subtracted from the raw profiles? If modelling, does the model account for the presence of contrast medium?
Two methods for cross-scatter correction in dual source CT.
The first method is model-based by assuming that cross-scatter is predominantly surface scatter, adequate knowledge about the surface of the scattering object is sufficient to describe the magnitude and distribution of cross-scatter. The correction is achieved by a table look-up into previously measured and stored cross-scatter distributions for a variety of objects with different surface characteristics.
The second technique is measurement-based dedicated sensors outside the penumbra of the fan beam in the z direction on both detectors (a) and (b) are used for an online measurement of both cross-scattered and forward scattered radiation during the CT-scan.
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