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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.4K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
402
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

488
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
488
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

464
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
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Ultrasound II: Endoscopic Ultrasound and FibroScan01:25

Ultrasound II: Endoscopic Ultrasound and FibroScan

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Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
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Related Experiment Video

Updated: Dec 13, 2025

Manufacturing Abdominal Aorta Hydrogel Tissue-Mimicking Phantoms for Ultrasound Elastography Validation
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Parameterized Strain Estimation for Vascular Ultrasound Elastography With Sparse Representation.

Hongliang Li, Jonathan Poree, Boris Chayer

    IEEE Transactions on Medical Imaging
    |August 4, 2020
    PubMed
    Summary

    A new sparse model strain estimator (SMSE) improves ultrasound vascular strain imaging for plaque instability prediction. It offers higher accuracy, noise robustness, and faster processing than existing methods.

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    Area of Science:

    • Biomedical Engineering
    • Medical Imaging
    • Cardiovascular Research

    Background:

    • Ultrasound vascular strain imaging analyzes vessel wall motion from cardiac pulsation to predict plaque instability.
    • Current methods face limitations in resolution, computational efficiency, and noise robustness.

    Purpose of the Study:

    • To introduce a novel sparse model strain estimator (SMSE) for high-resolution vascular strain field reconstruction.
    • To enhance accuracy, computational efficiency, and robustness against noise in ultrasound vascular strain imaging.

    Main Methods:

    • The SMSE utilizes discrete cosine transform (DCT) coefficients to parameterize displacement and strain fields.
    • Affine strain components were derived by solving for truncated DCT coefficients, enabling reconstruction.
    • An analytical solution was implemented to decrease estimation time.

    Main Results:

    • SMSE reduced estimation errors by up to 50% compared to the Lagrangian speckle model estimator (LSME) in simulations.
    • SMSE demonstrated superior robustness against global and local noise.
    • In vitro and in vivo tests showed 2-3 times lower residual strains with SMSE than LSME.
    • Processing time was reduced 4-25 times with SMSE compared to LSME.
    • Phantom studies confirmed enhanced spatial resolution with SMSE.

    Conclusions:

    • The proposed SMSE algorithm significantly improves accuracy, efficiency, and spatial resolution in ultrasound vascular strain imaging.
    • SMSE offers a more robust and computationally efficient approach for predicting plaque instability.
    • This method holds promise for advancing cardiovascular diagnostics through enhanced plaque characterization.