Cone-Beam Composite-Circling Scan and Exact Image Reconstruction for a Quasi-Short Object

Yu, Hengyong; Wang, Ge

doi:https://doi.org/10.1155/2007/87319

International Journal of Biomedical Imaging

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Research Article | Open Access

Volume 2007 | Article ID 087319 | https://doi.org/10.1155/2007/87319

Cone-Beam Composite-Circling Scan and Exact Image Reconstruction for a Quasi-Short Object

Hengyong Yu¹and Ge Wang¹

Academic Editor: M. Jiang

Received12 Nov 2007

Accepted20 Nov 2007

Published03 Feb 2008

Abstract

Here we propose a cone-beam composite-circling mode to solve the quasi-short object problem, which is to reconstruct a short portion of a long object from longitudinally truncated cone-beam data involving the short object. In contrast to the saddle curve cone-beam scanning, the proposed scanning mode requires that the X-ray focal spot undergoes a circular motion in a plane facing the short object, while the X-ray source is rotated in the gantry main plane. Because of the symmetry of the proposed mechanical rotations and the compatibility with the physiological conditions, this new mode has significant advantages over the saddle curve from perspectives of both engineering implementation and clinical applications. As a feasibility study, a backprojection filtration (BPF) algorithm is developed to reconstruct images from data collected along a composite-circling trajectory. The initial simulation results demonstrate the correctness of the proposed exact reconstruction method and the merits of the proposed mode.

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Copyright

Copyright © 2007 Hengyong Yu and Ge Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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