Image reconstruction in asymmetric fan-beam scans with spatially varying focal lengths

Lifeng Yu; Xiaochuan Pan; Charles A. Pelizzari

doi:10.1117/12.535326

12 May 2004 Image reconstruction in asymmetric fan-beam scans with spatially varying focal lengths

Lifeng Yu, Xiaochuan Pan, Charles A. Pelizzari

Proceedings Volume 5370, Medical Imaging 2004: Image Processing; (2004) https://doi.org/10.1117/12.535326
Event: Medical Imaging 2004, 2004, San Diego, California, United States

Abstract

We propose a generalized algorithm for image reconstruction from data acquired in an asymmetric fan-beam configuration with a spatially varying focal length. This algorithm is an extension of our previous algorithm for fan-beam computed tomography (CT) that involves a shift-variant filtering. As compared to the existing algorithms, the proposed algorithm involves no additional explicit interpolation and eliminates the spatially-variant weighting factor. Therefore, it retains the spatial resolution and is less susceptible to data noise. 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.

Citation Download Citation

Lifeng Yu, Xiaochuan Pan, and Charles A. Pelizzari "Image reconstruction in asymmetric fan-beam scans with spatially varying focal lengths", Proc. SPIE 5370, Medical Imaging 2004: Image Processing, (12 May 2004); https://doi.org/10.1117/12.535326

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KEYWORDS

Reconstruction algorithms

Data acquisition

Image restoration

Sensors

Computed tomography

Detection and tracking algorithms

Algorithm development

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