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An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements

OBJECTIVES: Various elastography techniques have been proffered based on linear or nonlinear constitutive models with the aim of detecting and classifying pathologies in soft tissues accurately and noninvasively. Biological soft tissues demonstrate behaviors which conform to nonlinear constitutive m...

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Autores principales: Dastjerdi, Maryam Mehdizadeh, Fallah, Ali, Rashidi, Saeid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6339765/
https://www.ncbi.nlm.nih.gov/pubmed/30723537
http://dx.doi.org/10.1155/2019/2374645
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author Dastjerdi, Maryam Mehdizadeh
Fallah, Ali
Rashidi, Saeid
author_facet Dastjerdi, Maryam Mehdizadeh
Fallah, Ali
Rashidi, Saeid
author_sort Dastjerdi, Maryam Mehdizadeh
collection PubMed
description OBJECTIVES: Various elastography techniques have been proffered based on linear or nonlinear constitutive models with the aim of detecting and classifying pathologies in soft tissues accurately and noninvasively. Biological soft tissues demonstrate behaviors which conform to nonlinear constitutive models, in particular the hyperelastic ones. In this paper, we represent the results of our steps towards implementing ultrasound elastography to extract hyperelastic constants of a tumor inside soft tissue. METHODS: Hyperelastic parameters of the unknown tissue have been estimated by applying the iterative method founded on the relation between stress, strain, and the parameters of a hyperelastic model after (a) simulating the medium's response to a sinusoidal load and extracting the tissue displacement fields in some instants and (b) estimating the tissue displacement fields from the recorded/simulated ultrasound radio frequency signals and images using the cross correlation-based technique. RESULTS: Our results indicate that hyperelastic parameters of an unidentified tissue could be precisely estimated even in the conditions where there is no prior knowledge of the tissue, or the displacement fields have been approximately calculated using the data recorded by a clinical ultrasound system. CONCLUSIONS: The accurate estimation of nonlinear elastic constants yields to the correct cognizance of pathologies in soft tissues.
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spelling pubmed-63397652019-02-05 An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements Dastjerdi, Maryam Mehdizadeh Fallah, Ali Rashidi, Saeid J Healthc Eng Research Article OBJECTIVES: Various elastography techniques have been proffered based on linear or nonlinear constitutive models with the aim of detecting and classifying pathologies in soft tissues accurately and noninvasively. Biological soft tissues demonstrate behaviors which conform to nonlinear constitutive models, in particular the hyperelastic ones. In this paper, we represent the results of our steps towards implementing ultrasound elastography to extract hyperelastic constants of a tumor inside soft tissue. METHODS: Hyperelastic parameters of the unknown tissue have been estimated by applying the iterative method founded on the relation between stress, strain, and the parameters of a hyperelastic model after (a) simulating the medium's response to a sinusoidal load and extracting the tissue displacement fields in some instants and (b) estimating the tissue displacement fields from the recorded/simulated ultrasound radio frequency signals and images using the cross correlation-based technique. RESULTS: Our results indicate that hyperelastic parameters of an unidentified tissue could be precisely estimated even in the conditions where there is no prior knowledge of the tissue, or the displacement fields have been approximately calculated using the data recorded by a clinical ultrasound system. CONCLUSIONS: The accurate estimation of nonlinear elastic constants yields to the correct cognizance of pathologies in soft tissues. Hindawi 2019-01-06 /pmc/articles/PMC6339765/ /pubmed/30723537 http://dx.doi.org/10.1155/2019/2374645 Text en Copyright © 2019 Maryam Mehdizadeh Dastjerdi et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Dastjerdi, Maryam Mehdizadeh
Fallah, Ali
Rashidi, Saeid
An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title_full An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title_fullStr An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title_full_unstemmed An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title_short An Iterative Method for Estimating Nonlinear Elastic Constants of Tumor in Soft Tissue from Approximate Displacement Measurements
title_sort iterative method for estimating nonlinear elastic constants of tumor in soft tissue from approximate displacement measurements
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6339765/
https://www.ncbi.nlm.nih.gov/pubmed/30723537
http://dx.doi.org/10.1155/2019/2374645
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