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Article
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SIAM Journal on Applied Mathematics
Article . 1996 . Peer-reviewed
Data sources: Crossref
https://doi.org/10.1201/978100...
Part of book or chapter of book . 2020 . Peer-reviewed
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Pseudolocal Tomography

Pseudolocal tomography
Authors: Alexander G. Ramm; Alexander Katsevich;

Pseudolocal Tomography

Abstract

The authors propose a pseudolocal tomography concept. Let \(d > 0\) be fixed, they consider the following pseudolocal tomography formula \[ f_d (x) = {1 \over 4 \pi^2} \int_{S^1} \int^{x. \theta + d}_{x. \theta - d} {\widehat f_d(\theta, p) \over x. \theta - p} dp d \theta,\;x \in \mathbb{R}^2 \] where \(S^1\) is the unit sphere in \(\mathbb{R}^2\), \(d \theta\) is the measure on \(S^1 \), and \(\widehat f(\theta, p)\) the Radon transform of \(f, \theta \in S^1\), \(p \in \mathbb{R}\). The function \(f_d\) has locality properties and preserves locations and sizes of discontinuities of the original density function and of its derivatives. In particular, one can recover locations and values of jumps of the original function \(f\) from these of \(f_d\). The resulting images of jumps are sharper than those in standard global tomography. Numerical aspects of pseudolocal tomography are discussed. Results of model experiments show the effectiveness of the methods proposed.

Keywords

Biomedical imaging and signal processing, pseudolocal tomography, discontinuities, Numerical methods for integral transforms, Radon transform

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citations
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!
33
Top 10%
Top 10%
Top 10%
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