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Optical Engineering

Conjugate cone-beam reconstruction algorithm
Author(s): Jiang Hsieh; Xiangyang Tang; Jean-Baptiste Thibault; Charlie Shaughnessy; Roy A. Nilsen; Eugene C. Williams
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Paper Abstract

Backprojection is an essential step of the cone-beam reconstruction algorithm for computed tomography. Conventional backprojection maps a reconstructed voxel to the projection space by interpolating across adjacent detector channels and rows of a single projection. Although this approach is computationally efficient, both theoretical analysis and phantom experiments have shown that a significant degradation in z resolution can result. To overcome this shortcoming, we propose a conjugate cone-beam backprojection approach in which two projections that are 180 deg apart are backprojected simultaneously. By carefully selecting the helical pitch and designing the interpolation function, the z resolution of the reconstructed images can be significantly improved. The proposed conjugate backprojection algorithm has the potential to reduce data extrapolation artifacts due to limited detector size in step-and-shoot data acquisition. Extensive computer simulations and phantom experiments are used to demonstrate the efficacy of our approach.

Paper Details

Date Published: 1 June 2007
PDF: 10 pages
Opt. Eng. 46(6) 067001 doi: 10.1117/1.2746866
Published in: Optical Engineering Volume 46, Issue 6
Show Author Affiliations
Jiang Hsieh, GE Healthcare (United States)
Xiangyang Tang, GE Healthcare (United States)
Jean-Baptiste Thibault, GE Healthcare (United States)
Charlie Shaughnessy, GE Healthcare (United States)
Roy A. Nilsen, GE Healthcare (United States)
Eugene C. Williams, GE Healthcare (United States)

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