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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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...
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...

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Related Experiment Video

Updated: Jun 27, 2026

Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
12:18

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Variability of Transrectal Shear Wave Elastography in a Phantom Model.

Jihyun Lee, Seong Kuk Yoon, Jin Han Cho

    Journal of the Korean Society of Radiology
    |October 23, 2023
    PubMed
    Summary

    Transrectal shear wave elastography (SWE) variability is influenced by phantom size, depth, and ultrasound machine. These factors impact SWE measurements, crucial for accurate assessments.

    Keywords:
    ElastographyProstateTissue Elasticity ImagingUltrasound

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    Area of Science:

    • Medical Imaging
    • Ultrasound Technology
    • Biomedical Engineering

    Background:

    • Shear wave elastography (SWE) is an emerging ultrasound technique for tissue stiffness assessment.
    • Transrectal SWE applications require understanding measurement variability.
    • Phantom studies are essential for evaluating elastography method consistency.

    Purpose of the Study:

    • To assess the variability of transrectal shear wave elastography (SWE) measurements.
    • To investigate the impact of phantom characteristics and acquisition parameters on SWE variability.
    • To establish the reliability of transrectal SWE in a controlled phantom setting.

    Main Methods:

    • Utilized a custom-designed phantom with varying sizes (1-3 cm), shapes (round, cubic), and materials (agarose, emulsion silicone).
    • Evaluated SWE values at different depths (1-3 cm) and region of interest (ROI) locations (central, peripheral) using two ultrasound machines from different vendors.
    • Assessed variability using the coefficient of variation (CV) and analyzed intra-/inter-operator agreement via intraclass correlation coefficients.

    Main Results:

    • SWE variability (CV) decreased with increasing phantom size but increased with depth.
    • Significant differences in SWE values were observed based on phantom size, depth, shape, ROI location, and ultrasound machine.
    • Excellent intra-/inter-operator agreement (ICC > 0.9) was achieved, indicating high reproducibility.

    Conclusions:

    • Phantom size, depth, and the ultrasound machine significantly affect transrectal SWE variability.
    • Understanding these influencing factors is critical for optimizing transrectal SWE protocols.
    • The study highlights the need for standardized phantom-based quality assurance in transrectal elastography.