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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Spatial Compounding Technique to Obtain Rotation Elastogram: A Feasibility Study.

AliArshad Kothawala1, Sowmiya Chandramoorthi1, N Ravi Kiran Reddy1

  • 1Department of Applied Mechanics (Biomedical Engineering Group), Indian Institute of Technology, Madras, Chennai, India.

Ultrasound in Medicine & Biology
|April 24, 2017
PubMed
Summary
This summary is machine-generated.

Spatial compounding improves ultrasound rotation elastography for breast lesion assessment. This technique enhances the quality of rotation elastograms, aiding in distinguishing malignant from benign masses.

Keywords:
Axial displacementAxial shear strain elastogramBreast lesionFibroadenomaLateral displacementMalignant lesionRotation elastogramSpatial compounding

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Ultrasound Technology

Background:

  • Physicians use palpation to assess breast mass stiffness and slipperiness for malignancy risk.
  • Current ultrasound elastography primarily offers stiffness data, lacking information on local rigid body rotation.
  • Poor lateral resolution in ultrasound limits accurate estimation of local rigid body rotation in lesions.

Purpose of the Study:

  • To explore the feasibility of enhancing rotation elastogram quality using spatial compounding.
  • To investigate the impact of spatial compounding on estimating local rigid body rotation in breast lesions.

Main Methods:

  • Simulations using Field II and experiments on tissue-mimicking phantoms were conducted.
  • A multilevel 2-D displacement tracking algorithm estimated angular axial and lateral displacements under compression.
  • Rotation elastograms (RE) were generated using displacement gradient differences; quality was assessed via contrast-to-noise ratio (CNR).

Main Results:

  • Spatial compounding significantly improved the quality of rotation elastograms.
  • Both simulation and experimental results demonstrated enhanced RE quality with the compounding technique.
  • Varying steering and incremental angles affected RE quality, with optimal parameters identified.

Conclusions:

  • Spatial compounding is a feasible technique for improving rotation elastogram quality in ultrasound imaging.
  • This advancement offers potential for better characterization of breast lesions, aiding in malignancy assessment.
  • Improved RE quality may lead to more accurate differentiation between benign and malignant breast masses.