Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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...
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...
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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...
Strain-Energy Density01:20

Strain-Energy Density

Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Virtual Source-Based Apodization for Diverging Wave Imaging: An Experimental Study.

Ultrasonic imaging·2026
Same author

Multi-objective optimization of virtual source distributions for ultrafast diverging wave imaging.

Ultrasonics·2026
Same author

CACTUS: Multiview classifier for Punctate White Matter Lesions detection & segmentation in cranial ultrasound volumes.

Computers in biology and medicine·2025
Same author

Regularizing the inverse problem of ultrasound beamforming with non-local structure tensor total variation.

Ultrasonics·2025
Same author

Simulation, Design, and Characterization of a Large Divergent Element Sparse Array (LDESA) for 3-D Ultrasound Imaging.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2025
Same author

The Thumb Rule - an approach to optimise musculoskeletal ultrasound scanning in Rheumatology.

Clinical and experimental rheumatology·2025

Related Experiment Video

Updated: May 17, 2026

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography
07:57

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography

Published on: May 10, 2022

Internal strain estimation for quantification of human heel pad elastic modulus: A phantom study.

Karen Holst1, Hervé Liebgott, Jens E Wilhjelm

  • 1Biomedical Engineering, Department of Electrical Engineering, Technical University of Denmark, Ørsteds Plads, Building 349, DK-2800 Kgs. Lyngby, Denmark. s042192@student.dtu.dk

Ultrasonics
|October 20, 2012
PubMed
Summary

This study introduces a novel ultrasound technique for measuring heel pad elasticity, crucial for shock absorption. The method accurately quantifies elastic modulus, aiding in diagnosing conditions affecting heel pad function.

More Related Videos

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy
06:16

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy

Published on: May 1, 2020

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
09:32

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

Related Experiment Videos

Last Updated: May 17, 2026

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography
07:57

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography

Published on: May 10, 2022

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy
06:16

A Probing Device for Quantitatively Measuring the Mechanical Properties of Soft Tissues during Arthroscopy

Published on: May 1, 2020

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
09:32

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Medical Imaging

Background:

  • The human heel pad's primary function is shock absorption, which is compromised by changes in elasticity.
  • Current methods for assessing heel pad elasticity rely on limited external strain measurements.
  • Conditions like diabetes and long-distance running can negatively impact heel pad elasticity and cause pain.

Purpose of the Study:

  • To develop a quantitative method for measuring heel pad elastic modulus using internal strain data.
  • To utilize ultrasound imaging for assessing heel pad elasticity non-invasively.
  • To establish a more accurate assessment of heel pad mechanical properties.

Main Methods:

  • Manufactured nine heel phantoms with varying stiffness and thickness to simulate human heel pads.
  • Employed an indentation system with a 7MHz ultrasound transducer and load cell for simultaneous data acquisition.
  • Calculated internal tissue displacement using phase-based cross-correlation on ultrasound images to derive strain maps.

Main Results:

  • The developed technique successfully distinguished eight out of nine heel phantoms based on their manufactured stiffness.
  • Elastic moduli showed minimal dependence on phantom thickness, indicating robustness.
  • Mean elastic moduli were 89kPa (soft), 153kPa (medium), and 168kPa (hard), demonstrating sensitivity to stiffness variations.

Conclusions:

  • The combination of ultrasound imaging and force measurements provides an effective approach for assessing heel pad elastic properties.
  • Internal strain estimation using ultrasound offers a more comprehensive understanding of heel pad mechanics.
  • This technique holds potential for improved diagnosis and management of conditions affecting heel pad function.