
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.
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
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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