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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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 gauge...
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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...
Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...

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Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
07:50

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation

Published on: January 27, 2023

Normal and shear strain imaging using 2D deformation tracking on beam steered linear array datasets.

Haiyan Xu1, Tomy Varghese

  • 1Department of Medical Physics, University of Wisconsin, Madison, WI, USA. hxu26@wisc.edu

Medical Physics
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces adaptive parallelogram-shaped 2D processing for ultrasound deformation tracking, improving accuracy at greater depths. This method enhances spatial resolution and signal-to-noise ratio for better strain imaging.

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Area of Science:

  • Ultrasound imaging
  • Biomedical engineering
  • Medical physics

Background:

  • Traditional 1D cross-correlation struggles with deep ultrasound imaging due to low signal-to-noise.
  • Accurate deformation tracking is crucial for advanced ultrasound applications like strain imaging.

Purpose of the Study:

  • To introduce and evaluate adaptive parallelogram-shaped 2D processing blocks for improved ultrasound deformation tracking.
  • To overcome limitations of 1D methods in accurately tracking displacements at larger depths.

Main Methods:

  • Acquired beam-steered ultrasound datasets using a linear array transducer at various angles.
  • Employed adaptive parallelogram-shaped 2D processing blocks for deformation tracking.
  • Calculated axial and lateral displacement vectors and estimated normal and shear strain components.

Main Results:

  • Parallelogram 2D tracking significantly improved spatial resolution by a factor of 7.79 along the beam direction.
  • Achieved a 5 dB improvement in signal-to-noise ratio and 8-14 dB improvement in contrast-to-noise ratio.
  • Demonstrated enhanced strain imaging performance with beam-steered linear array transducers.

Conclusions:

  • Adaptive parallelogram-shaped 2D deformation tracking is effective in beam-steered ultrasound data.
  • This method enables more accurate estimation of normal and shear strain components.
  • The technique offers significant improvements over previous 1D methods for deep tissue imaging.