Related Experiment Video
Updated: May 2, 2026
08:19
Author Spotlight: Shear Assay Protocol for the Determination of Single-Cell Material Properties
Published on: May 19, 2023
2.4K
Physical models of tissue in shear fields
Edwin L Carstensen1, Kevin J Parker1
1Department of Electrical and Computer Engineering and Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA.
Ultrasound in Medicine & Biology
|March 4, 2014
Summary
This review explores physical models for tissue shear elasticity, focusing on viscoelasticity, acoustic relaxation, and hysteresis. Understanding these mechanisms is crucial for advancing tissue characterization beyond bulk moduli.
Area of Science:
- Biophysics
- Biomaterials Science
- Medical Imaging
Background:
- Tissue characterization heavily relies on bulk moduli, with limited research on low-frequency shear properties.
- Shear elasticity models are essential for understanding tissue mechanics and developing advanced imaging techniques like elastography.
- Current understanding of physical mechanisms governing tissue shear properties is nascent.
Purpose of the Study:
- To review and categorize physical models of tissue shear elasticity.
- To provide a framework for hypothesis generation regarding the physical mechanisms underlying tissue shear properties.
- To highlight the under-researched area of low-frequency shear data in tissue characterization.
Main Methods:
- Review of three classes of physical models: simple viscoelasticity, acoustic relaxation, and hysteresis.
- Discussion of the role of viscoelasticity in elastography and data communication.
- Analysis of energy dissipation mechanisms related to strain and time.
Main Results:
- Identified simple viscoelasticity, acoustic relaxation, and hysteresis as key physical models for shear elasticity.
- Highlighted the importance of viscoelasticity in the context of elastography.
- Emphasized the limited progress in low-frequency shear data analysis compared to bulk moduli.
Conclusions:
- Physical models offer a pathway to understand tissue shear properties beyond phenomenological descriptions.
- Further research into low-frequency shear mechanics is needed for comprehensive tissue characterization.
- This review serves as a foundation for future research into the physical basis of tissue shear elasticity.
More Related Videos
Related Concept Videos
01:20Shearing Strain
1.9K
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...
1.9K
01:15Stress: General Loading Conditions
743
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
743
01:14Normal and Shear Force
4.2K
When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
4.2K
01:18Shearing Stress
2.5K
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
2.5K
01:22Problem Solving on Stress and Strain
1.9K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
1.9K
01:20Elastic Strain Energy for Shearing Stresses
668
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...
668