DOI: https://doi.org/10.26089/NumMet.v18r327

The problem of choosing initial approximations in inverse problems of ultrasound tomography

Authors

  • A.V. Goncharsky
  • S.Yu. Romanov
  • S.Yu. Seryozhnikov

Keywords:

ultrasound tomography
wave equation
nonlinear coefficient inverse problem
iterative algorithms
initial approximation

Abstract

This paper is devoted to developing efficient iterative methods to solve nonlinear inverse problems of wave tomography. The iterative algorithms used to obtain an approximate solution of the inverse problem are based on an explicit representation of the gradient of the residual functional between the measured and computed wave fields. The choice of the initial approximation is of great importance for the convergence of the iterative process in a nonlinear inverse problem. The possibility of using an initial approximation to the sound speed obtained via solving the inverse problem in the ray approximation is studied. The efficiency of this approach is illustrated by solving model problems using a supercomputer. These model problems are designed for the ultrasound tomographic imaging of soft tissues in medicine.

New computational technologies

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Published

2017-08-14

Issue

Vol. 18 (2017): Issue 3.

Section

Section 1. Numerical methods and applications

Author Biographies

A.V. Goncharsky

Lomonosov Moscow State University
• Head of Laboratory

S.Yu. Romanov

Lomonosov Moscow State University
• Leading Researcher

S.Yu. Seryozhnikov

Lomonosov Moscow State University
• Electronic

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