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Optical Engineering

Asymmetric fan-beam configurations with spatially varying focal lengths and shift-variant filtering reconstruction
Author(s): Lifeng Yu; Xiaochuan M. Pan; Charles A. Pelizzari
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Paper 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.

Paper Details

Date Published: 1 October 2004
PDF: 8 pages
Opt. Eng. 43(10) doi: 10.1117/1.1786295
Published in: Optical Engineering Volume 43, Issue 10
Show Author Affiliations
Lifeng Yu, Univ. of Chicago (United States)
Xiaochuan M. Pan, Univ. of Chicago (United States)
Charles A. Pelizzari, Univ. of Chicago (United States)

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