Iterative scatter correction based on artifact assessment

Jens Wiegert; Steffen Hohmann; Matthias Bertram

doi:10.1117/12.771029

18 March 2008 Iterative scatter correction based on artifact assessment

Jens Wiegert, Steffen Hohmann, Matthias Bertram

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 69132B (2008) https://doi.org/10.1117/12.771029
Event: Medical Imaging, 2008, San Diego, California, United States

Abstract

In this paper we propose a novel scatter correction methodology for X-ray based cone-beam CT that allows to combine the advantages of projection-based and volume-based correction approaches. The basic idea is to use a potentially non-optimal projection-based scatter correction method and to iteratively optimize its performance by repeatedly assessing remaining scatter-induced artifacts in intermediately reconstructed volumes. The novel approach exploits the fact that due to the flatness of the scatter-background, compensation itself is most easily performed in the projection-domain, while the scatter-induced artifacts can be better observed in the reconstructed volume. The presented method foresees to evaluate the scatter correction efficiency after each iteration by means of a quantitative measure characterizing the amount of residual cupping and to adjust the parameters of the projection-based scatter correction for the next iteration accordingly. The potential of this iterative scatter correction approach is demonstrated using voxelized Monte Carlo scatter simulations as ground truth. Using the proposed iterative scatter correction method, remarkable scatter correction performance was achieved both using simple parametric heuristic techniques as well as by optimizing previously published scatter estimation schemes. For the human head, scatter induced artifacts were reduced from initially 148 HU to less than 8.1 HU to 9.1 HU for different studied methods, corresponding to an artifact reduction exceeding 93%.

Citation Download Citation

Jens Wiegert, Steffen Hohmann, and Matthias Bertram "Iterative scatter correction based on artifact assessment", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69132B (18 March 2008); https://doi.org/10.1117/12.771029

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