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Elastography for portable ultrasound.

Bonghun Shin1, Soo Jeon1, Jeongwon Ryu2

  • 11Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave. W, Waterloo, ON N2L 3G1 Canada.

Biomedical Engineering Letters
|January 4, 2019
PubMed
Summary
This summary is machine-generated.

A new robust phase-based strain estimator (RPSE) enables elastography on portable ultrasound devices. This method is computationally efficient and robust to parameter variations, improving image quality for advanced diagnostics.

Keywords:
DopplerElastogramsElastographyPhase-shiftPortable ultrasoundStrain estimation

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Portable wireless ultrasound devices offer advantages like portability and affordability but lack elastography.
  • Existing elastography methods, such as phase-based strain estimators (PSE), are incompatible with portable ultrasound due to computational and data transfer limitations.
  • Variations in ultrasound parameters in portable devices hinder the adoption of conventional strain estimators.

Purpose of the Study:

  • To propose a novel elastography method, the robust phase-based strain estimator (RPSE), specifically designed for portable ultrasound devices.
  • To ensure the proposed RPSE method is robust to variations in ultrasound parameters and computationally efficient.
  • To evaluate the performance and suitability of RPSE compared to existing strain estimators.

Main Methods:

  • Developed and implemented the robust phase-based strain estimator (RPSE).
  • Validated RPSE using numerical phantom data (Field II, Abaqus) and experimental data from a portable ultrasound device.
  • Compared RPSE with time-delay (TSE), displacement-gradient (DSE), and phase-based strain estimators (PSE) using signal-to-noise ratio (SNRe) and contrast-to-noise ratio (CNRe).
  • Assessed computational efficiency of each strain estimator.

Main Results:

  • RPSE achieved the highest SNRe and CNRe values (5.22 and 47.62 dB, respectively) in numerical phantom experiments.
  • RPSE demonstrated significantly higher computational efficiency, being approximately 10 times faster than TSE and DSE (0.06 s/frame vs. 5.76 s/frame).
  • RPSE proved robust to variations in ultrasound parameters, a key advantage for portable systems.

Conclusions:

  • The proposed robust phase-based strain estimator (RPSE) is a viable and effective method for implementing elastography on portable wireless ultrasound devices.
  • RPSE overcomes the limitations of conventional methods, offering improved image quality and computational efficiency.
  • This advancement has the potential to expand the diagnostic capabilities of affordable, portable ultrasound technology.