Asymmetric fan-beam configurations with spatially varying focal lengths and shift-variant filtering reconstruction

Lifeng Yu; Xiaochuan M. Pan; Charles A. Pelizzari

doi:10.1117/1.1786295

1 October 2004 Asymmetric fan-beam configurations with spatially varying focal lengths and shift-variant filtering reconstruction

Lifeng Yu, Xiaochuan M. Pan, Charles A. Pelizzari

Author Affiliations +

Optical Engineering, Vol. 43, Issue 10, (October 2004). https://doi.org/10.1117/1.1786295

Abstract

We present an algorithm for image reconstruction from data acquired by use of an asymmetric fan-beam configuration with a spatially varying focal length. This algorithm is a natural generalization of our previous algorithm for fan-beam computed tomography (CT) that involves shift-variant filtering, and it possesses desirable noise and numerical properties similar to those in the previous algorithm. We performed computer simulation studies to validate and evaluate the proposed algorithm, and quantitative results demonstrate that the proposed algorithm possesses desirable noise and numerical properties. The filtered backprojection algorithm can reconstruct images from data acquired in a configuration with a constant focal length. In this situation, the proposed algorithm yields images with lower and more uniform noise properties than the filtered backprojection algorithm.

©(2004) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Lifeng Yu, Xiaochuan M. Pan, and Charles A. Pelizzari "Asymmetric fan-beam configurations with spatially varying focal lengths and shift-variant filtering reconstruction," Optical Engineering 43(10), (1 October 2004). https://doi.org/10.1117/1.1786295

Published: 1 October 2004

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