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Proceedings Paper

Performance comparison of projector-backprojector pairs for iterative tomographic reconstruction
Author(s): Soo-Jin Lee; Soo-Mee Kim
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Paper Abstract

Iterative reconstruction methods, such as the expectation maximization (EM) algorithm and its extended approaches, have played a prominent role in emission computed tomography due to their remarkable advantages over the conventional filtered backprojection method. However, since iterative reconstructions typically are comprised of repeatedly projecting and backprojecting the data, the computational load required for reconstructing an image highly depends on the performance of the projector-backprojector pair used in the algorithm. In this work we compare quantitative performance of representative methods for implementing projector-backprojector pairs-ray-tracing methods, rotation-based methods, and pixel-driven methods. To reduce the overall cost for the projection-backprojection operations for each method, we investigate how previously computed results can be reused so that the number of redundant calculations can be minimized. Our experimental results demonstrate that, while the rotation based methods can be useful for simplifying the correction of important physical factors, the computational cost to achieve good accuracy is considerably higher than that of the ray-tracing methods.

Paper Details

Date Published: 19 November 2003
PDF: 12 pages
Proc. SPIE 5203, Applications of Digital Image Processing XXVI, (19 November 2003); doi: 10.1117/12.505148
Show Author Affiliations
Soo-Jin Lee, Paichai Univ. (South Korea)
Soo-Mee Kim, Paichai Univ. (South Korea)

Published in SPIE Proceedings Vol. 5203:
Applications of Digital Image Processing XXVI
Andrew G. Tescher, Editor(s)

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