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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...
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...

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Related Experiment Video

Updated: Jun 23, 2026

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

Whole bone strain quantification by image registration: a validation study.

Michael R Hardisty1, Cari M Whyne

  • 1Institute of Biomaterials and Biomedical Engineering, University of Toronto, Orthopaedic and Biomechanics Laboratory, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Room UB-19, Toronto, ON, M4N 3M5, Canada. m.hardisty@utoronto.ca

Journal of Biomechanical Engineering
|May 20, 2009
PubMed
Summary
This summary is machine-generated.

This study developed a novel microCT imaging method to precisely quantify bone strain in vertebrae. The validated technique accurately measures bone strain, aiding fracture risk assessment and understanding bone healing.

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Quantification of Strain in a Porcine Model of Skin Expansion Using Multi-View Stereo and Isogeometric Kinematics

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Skeletal Biology

Background:

  • Quantifying bone strain is crucial for understanding skeletal health, including fracture risk, bone healing, and turnover.
  • Microcomputed tomography (microCT) imaging offers high-resolution visualization of bone structure.

Purpose of the Study:

  • To develop and validate an intensity matching image registration method for accurate, spatially resolved strain measurement in vertebrae using microCT.
  • To assess the method's ability to quantify zero strain and reproduce known strain fields.

Main Methods:

  • A novel strain quantification method utilizing sequential microCT scans of loaded and unloaded vertebrae.
  • Implementation of a multiresolution intensity matching deformable registration algorithm for image correlation.
  • Calculation of displacement and strain fields from affine mappings between scans.

Main Results:

  • The deformable registration method demonstrated high accuracy, with an average R2 of 0.96 for imposed strain fields.
  • Established a sensitive detection limit of 0.0004 strain.
  • Successfully measured both displacement and strain fields in whole rat vertebrae.

Conclusions:

  • The developed microCT-based image registration method accurately quantifies bone strain and displacement in vertebrae.
  • This validated technique provides a robust tool for investigating bone mechanics and improving skeletal health assessments.
  • Further validation across diverse strain fields and bone structures is recommended.