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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Reduced peak-hopping artifacts in ultrasonic strain estimation using the Viterbi algorithm.

Yael Petrank1, Lingyun Huang, Matthew O'Donnell

  • 1Department of Bioengineering, University of Washington, Seattle, WA, USA. yael3@u.washington.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|July 4, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces the Viterbi algorithm to improve ultrasound elasticity imaging. The Viterbi algorithm significantly reduces errors in strain estimation caused by "peak hopping" in complex ultrasound images.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Computational Mechanics

Background:

  • Internal strain estimation in tissues relies on speckle pattern correlation in ultrasound images.
  • Large deformations can cause
  • peak hopping
  • leading to significant errors in displacement and strain calculations.

Purpose of the Study:

  • To investigate the Viterbi algorithm for overcoming peak-hopping artifacts in ultrasound-based strain estimation.
  • To enhance the accuracy of motion and deformation estimates in elasticity imaging.

Main Methods:

  • Utilized the Viterbi algorithm, a dynamic programming approach, for motion estimation.
  • Analyzed radio-frequency ultrasound data before and after simulated tissue deformation (average strain 6%).
  • Simulated scenarios included homogenous and heterogeneous media with stiffer inclusions.

Main Results:

  • Viterbi processing effectively reduced peak-hopping artifacts in speckle-tracking outputs.
  • The algorithm demonstrated suitability for motion estimation where adjacent tissue elements maintain proximity.
  • Accurate strain estimation was achieved even with significant deformations.

Conclusions:

  • The Viterbi algorithm is a robust method for mitigating peak-hopping artifacts in ultrasound elasticity imaging.
  • This dynamic programming approach enhances the reliability of strain and displacement measurements.
  • The findings support the Viterbi algorithm's application in advanced medical imaging techniques.