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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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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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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...
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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
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Strain and Elastic Modulus01:15

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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 Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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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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Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

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Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
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Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment
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Analysis of strain estimation methods in phase-sensitive compression optical coherence elastography.

Jiayue Li1,2,3,4, Ewelina Pijewska5,4, Qi Fang1,2

  • 1BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre Nedlands and Centre for Medical Research, The University of Western Australia, Crawley, Western Australia 6009, Australia.

Biomedical Optics Express
|May 6, 2022
PubMed
Summary
This summary is machine-generated.

A new method, WLS-FPU, accurately measures local strain in optical coherence elastography (OCE) over an extended dynamic range, outperforming existing methods for tissue analysis.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Biophysics

Background:

  • Compression optical coherence elastography (OCE) quantifies tissue deformation using local strain.
  • Several strain estimation methods exist, but their comparative performance in phase-sensitive OCE is not well-defined.

Purpose of the Study:

  • To compare the performance of prevalent strain estimation methods in compression OCE.
  • To introduce and evaluate a novel strain estimation method, WLS-FPU, combining fast phase unwrapping (FPU) with weighted least squares (WLS).

Main Methods:

  • Developed a framework to assess strain imaging metrics: sensitivity, signal-to-noise ratio (SNR), resolution, and accuracy.
  • Proposed and implemented the WLS-FPU method, comparing it against WLS-WPU (WLS with weighted phase unwrapping) and the vector method.
  • Analyzed performance on mouse skeletal muscle and human breast tissue.

Main Results:

  • WLS-FPU demonstrated superior accuracy in measuring local strain across an extended dynamic range compared to WLS-WPU and the vector method.
  • All three methods showed comparable strain sensitivity, SNR, and resolution.
  • The study achieved the first detection of sub-resolution contrast in compression OCE and analyzed its variation across methods.

Conclusions:

  • WLS-FPU offers enhanced accuracy and an extended dynamic range for strain measurement in OCE.
  • The novel WLS-FPU method mitigates artifacts associated with phase unwrapping errors, improving contrast and reliability in tissue elastography.
  • This work provides a comprehensive framework for evaluating OCE strain estimation techniques and introduces a superior method for biomechanical tissue characterization.