15 September 2008 Exact image reconstruction for triple-source cone-beam CT along saddle trajectories
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Abstract
In this paper, we propose an exact shift-invariant filtered backprojection (FBP) algorithm for triple-source saddle-curve cone-beam CT. In this imaging geometry, the sources are symmetrically positioned along a circle, and the trajectory of each x-ray source is a saddle. Then, we extend Yang's formula from the single-source case to the triple-source case. The saddles can be divided into four parts to specify four datasets. Each of them contains three data segments associated with different saddles. Then, images can be reconstructed on the planes orthogonal to the z-axis. Each plane intersects the trajectories at six pointes which can be used to define the filtering directions. With our triple-source approach, the scanning time is only one-third of that with the single-source saddle trajectory, and the reconstructed image quality is excellent in our numerical studies. These new features are important for cardiac imaging and small animal imaging.
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Yang Lu, Yang Lu, Jun Zhao, Jun Zhao, Ge Wang, Ge Wang, "Exact image reconstruction for triple-source cone-beam CT along saddle trajectories", Proc. SPIE 7078, Developments in X-Ray Tomography VI, 70780K (15 September 2008); doi: 10.1117/12.793716; https://doi.org/10.1117/12.793716
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