Deformation of tomograms for curvilinear tomography problems

Authors

DOI:

https://doi.org/10.26089/NumMet.v23r101

Keywords:

inverse problems, Radon transform, fan-beam tomography, curvilinear tomography, numerical simulation

Abstract

Earlier in our works, it was proposed to apply the method of a fan-beam mapping into a set of parallel lines in the problems of fan-beam tomography. This was achieved by special deformation of the reconstracted tomogram at the stage of back projection of the measured and filtered projections, followed by the operation of reverse deformation. The deformation of the tomogram for each direction of observation will be different, but the one-to-one nature of these deformations allows you to return to the original coordinate system. In this paper, the method is generalized to a family of plane curvilinear trajectories that allow one-to-one transitions to parallel rays. For each back projection, the image is modulated by a known function following from the path differential of the given trajectory. The results of generalization of the FBP algorithm widely used in two-dimensional tomography methods are demonstrated by examples of parabolic, sinusoidal and fan-beam ray trajectories.

 

Author Biography

Valery V. Pickalov

Khristianovich Institute of Theoretical and Applied Mechanics SB RAS,
• Associate Professor, Principal Scientist

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Published

31-01-2022

How to Cite

Пикалов В. В. Deformation of Tomograms for Curvilinear Tomography Problems // Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie). 2022. 23. 1-12. doi 10.26089/NumMet.v23r101

Issue

Section

Methods and algorithms of computational mathematics and their applications