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Proceedings Paper

Grangeat-type half-scan algorithm for cone beam CT
Author(s): Seung Wook Lee; Ge Wang
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Paper Abstract

Currently, various cone-beam CT scanners are under rapid development for major biomedical applications. Half-scan cone-beam image reconstruction algorithms are desirable, which assume only part of a scanning turn, and are advantageous in terms of temporal resolution. While the existing half-scan cone-beam algorithms are in the Feldkamp framework, we formulate a half-scan algorithm in the Grangeat framework for circular and helical trajectories. First, we modify the Grangeat formula in the circular half-scan case. With analytically defined boundaries, the Radon space is partitioned into shadow zone, singly and doubly sampled regions, respectively. A smooth weighting scheme is designed to compensate for data redundancy and inconsistency. The sampled regions are linearly interpolated into the shadow zone for a complete data set. Then, these concepts and formulas are extended to the helical half-scan case. Extensive numerical simulation studies are performed to verify the correctness and demonstrate the performance. Our Grangeat-type half-scan algorithms allow minimization of redundant data and optimization of temporal resolution, and outperform Feldkamp-type reconstruction in terms of image artifacts. These algorithms seem promising for quantitative and dynamic biomedical applications of cone-beam tomography.

Paper Details

Date Published: 5 June 2003
PDF: 21 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003);
Show Author Affiliations
Seung Wook Lee, Univ. of Iowa (United States)
Korea Advanced Institute of Science and Technology (South Korea)
Ge Wang, Univ. of Iowa (United States)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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