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Applied and Computational Harmonic Analysis
Article
License: Elsevier Non-Commercial
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Applied and Computational Harmonic Analysis
Article . 1999
License: Elsevier Non-Commercial
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Applied and Computational Harmonic Analysis
Article . 1999 . Peer-reviewed
License: Elsevier Non-Commercial
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zbMATH Open
Article . 1999
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Tomography, Approximate Reconstruction, and Continuous Wavelet Transforms

Tomography, approximate reconstruction, and continuous wavelet transforms
Authors: Madych, W.R.;

Tomography, Approximate Reconstruction, and Continuous Wavelet Transforms

Abstract

Adopting the viewpoint of continuous wavelet transforms as a tool for approximating planar density reconstructions, the paper under review studies the Radon transform of computerized X-ray tomography which is defined on a circular cylinder. Notice that the classical Radon transform performs projectively averages by integration over line bundles [\textit{J. Radon}, Ber. Verh. Sächs. Akad. Wiss. Leipzig, Math.-Naturw. Kl. 69, 262-277 (1917; JFM 46.0436.02); \textit{S. Helgason}; ``The Radon transform'' (1980; Zbl 0453.43011; 2nd ed. 1999; Zbl 0932.43010)]. The objective of the article is to introduce continuous wavelet transforms appropriate to the generation of high-resolution local reconstructions from local Radon transform data. This is accomplished by showing that the Radon inversion formula actually represents a summability method. The corresponding convolution kernels then allow the generation of analyzing wavelets with numerical efficient properties of mid-pass filtering bivariate scalar density functions. In this way, modifications of the backprojection algorithms are defined to analyze the local frequency content. MATLAB software is used to implement the algorithms and display the results with the Shepp-Logan phantom.

Related Organizations
Keywords

Signal theory (characterization, reconstruction, filtering, etc.), mid-pass filtering bivariate scalar density functions, Biomedical imaging and signal processing, JFM 46.0436.02, Applied Mathematics, continuous wavelet transforms, Nontrigonometric harmonic analysis involving wavelets and other special systems, high-resolution local reconstructions, computerized X-ray tomography, Radon transform

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
15
Average
Top 10%
Top 10%
hybrid