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Proceedings Paper

Iterative scatter correction based on artifact assessment
Author(s): Jens Wiegert; Steffen Hohmann; Matthias Bertram
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Paper 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%.

Paper Details

Date Published: 18 March 2008
PDF: 12 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69132B (18 March 2008); doi: 10.1117/12.771029
Show Author Affiliations
Jens Wiegert, Philips Research Europe (Germany)
Steffen Hohmann, Philips Research Europe (Germany)
Matthias Bertram, Philips Research Europe (Germany)


Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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