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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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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...
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Modeling and Similitude01:12

Modeling and Similitude

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Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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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...
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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SU-E-J-85: Anthropomorphic Development for Intermodality Deformation Algorithms Validation.

S D Vincent1, L Archambault1

  • 1CHUQ Pavillon Hotel-Dieu de Quebec, Quebec, QC.

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Summary
This summary is machine-generated.

Deformable image registration algorithms (DRA) enable adaptive radiation therapy by adjusting treatment plans to anatomical changes. Parameter control significantly improves registration accuracy for organ deformation and volume variations.

Keywords:
AnatomyComputed tomographyCone beam computed tomographyControl systemsImage registrationMedical imagingRadiation therapyRadiation treatment

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Image Analysis

Background:

  • Radiation therapy planning relies on static anatomy from simulation scans.
  • Anatomical changes during treatment necessitate adaptive planning.
  • Deformable image registration algorithms (DRA) can update plans to daily imaging.

Purpose of the Study:

  • To validate DRA using a controllable pelvic phantom.
  • To assess intermodality registration accuracy (CT-CBCT).
  • To compare DRA performance with varying parameter control.

Main Methods:

  • Developed an anthropomorphic pelvic phantom with controlled deformations (volume, contour, translation).
  • Acquired CT and CBCT images of the phantom in static and deformed states.
  • Evaluated two DRA systems: an open-source toolbox and a commercial system.

Main Results:

  • The open-source DRA achieved 98% distance reduction for 2cm organ translation vs. 60% for the commercial system.
  • For 100ml volume variation, DRA achieved 88% and 62% accuracy, respectively.
  • Phantom data enabled robust DRA validation.

Conclusions:

  • Greater parameter control in DRA leads to improved registration quality.
  • DRA facilitates adaptive radiotherapy planning for anatomical variations.
  • Validated phantom is crucial for DRA development and assessment.