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Proceedings Paper

Studies on artifacts of the Katsevich algorithm for spiral cone-beam CT
Author(s): Hengyong Yu; Ge Wang
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Paper Abstract

Recently, Katsevich proposed an exact filtered backprojection (FBP) algorithm to solve the long object problem. Although the Katsevich algorithm is theoretically error-free, it may produce image artifacts if its numerical implementation is not well designed. To evaluate the Katsevich algorithm, we implement it in planar detector geometry. Then, we study four types of image artifacts associated with the numerical implementation of this algorithm, which are “texture”, “streak”, “shadow” and “winkle” artifacts. The “texture” artifacts appear if the endpoints of the PI-Line are not treated appropriately. The “streak” artifacts are caused by an inadequate number of filtering lines Q, which can be reduced by setting 0.3N<Q<0.7N. In the step of Hilbert filtering, the aliasing effect results in “shadow” artifacts if the window is not truncated properly. The “wrinkle” artifacts are due to both the interpolation and difference operators, which may be minimized using more sophisticated interpolation methods, increasing projection data and using a more accurate derivative formula. Our results should be valuable to apply the Katsevich algorithm optimally for practical spiral cone-beam CT.

Paper Details

Date Published: 26 October 2004
PDF: 10 pages
Proc. SPIE 5535, Developments in X-Ray Tomography IV, (26 October 2004); doi: 10.1117/12.559286
Show Author Affiliations
Hengyong Yu, Hangzhou Dianzi Univ. (China)
Ge Wang, Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 5535:
Developments in X-Ray Tomography IV
Ulrich Bonse, Editor(s)

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