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Related Concept Videos

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...
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...
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...
Stress on an Oblique Plane01:16

Stress on an Oblique Plane

Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile stress. When...
Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member is the...
Transformation of Plane Stress01:18

Transformation of Plane Stress

Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's faces...

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Related Experiment Video

Updated: May 28, 2026

Quantification of Strain in a Porcine Model of Skin Expansion Using Multi-View Stereo and Isogeometric Kinematics
14:14

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

Published on: April 16, 2017

Cortical surface strain estimation using stereovision.

Songbai Ji1, Xiaoyao Fan, David W Roberts

  • 1Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA. songbai.ji@dartmouth.edu

Medical Image Computing and Computer-Assisted Intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention
|October 19, 2011
PubMed
Summary
This summary is machine-generated.

A novel noninvasive optical technique accurately measures soft tissue surface strain using stereo imaging and optical flow. This method quanties cortical strain during neurosurgery, revealing significant tissue deformation near the craniotomy edge.

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Neurosurgery

Background:

  • Estimating soft tissue strain is crucial for biomechanical characterization.
  • Current methods may be invasive or lack precision.
  • Noninvasive techniques are needed for in vivo biomechanical analysis.

Purpose of the Study:

  • To develop and validate a noninvasive technique for estimating soft tissue surface strain.
  • To apply the technique to evaluate cortical surface strain in neurosurgical patients.

Main Methods:

  • Utilized optical flow motion tracking with stereo images to obtain 3D displacements.
  • Applied local least squares smoothing to the displacement field.
  • Differentiated the smoothed displacement field to calculate surface strain.

Main Results:

  • Verified the strain estimation algorithm with simulated data.
  • Applied the technique in three open cranial neurosurgical cases.
  • Measured average maximum principal strains (epsilon1) of up to 7% in the cortical area.
  • Observed largest strains (up to -18%) near the craniotomy rim, predominantly perpendicular to the boundary.

Conclusions:

  • The developed technique provides a noninvasive method for soft tissue surface strain estimation.
  • Demonstrated the technique's utility in assessing dynamic cortical strain during neurosurgery.
  • Offers a new approach for biomechanical characterization of soft tissues.