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Scatter simulation and correction in computed tomography: A reconstruction-integrated approach modelling the forward projection

: Dremel, Kilian; Fuchs, Theobald


NDT & E International 86 (2017), S.132-139
ISSN: 0963-8695
Fraunhofer IZFP ()
Fraunhofer IIS ()
computed tomography; model-based reconstruction; object scattering

Scattered photons lower the quality of the reconstructed images in computed tomography. Additionally to scattering in the scintillator material that lowers the resolution, object-scattered photons cause artefacts due to non-linear absorption and are difficult to simulate. In the context of model-based reconstruction we developed a fast approximation for scattered radiation that is integrated in the forward projection of an iterative polychromatic reconstruction method. We develop the modelling of scattered intensities in an iterative maximum-likelihood reconstruction method, demonstrate a comparison with Monte-Carlo simulated scatter-data and show the result of reconstructed data within the field of industrial non-destructive testing.