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Christina P Keravnou1, Michalakis A Averkiou1

  • 1Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos, 1678 Nicosia, Cyprus.

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Dual frequency pulses in nonlinear ultrasound imaging generate new harmonic components. This advancement enhances pulse inversion techniques, offering improved capabilities for clinical applications.

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Area of Science:

  • Medical Imaging
  • Acoustics
  • Nonlinear Ultrasound

Background:

  • Nonlinear imaging techniques have advanced commercial ultrasound systems over the past 15 years.
  • These techniques offer significant benefits across various clinical applications.
  • Traditional methods often rely on single frequency pulses.

Purpose of the Study:

  • To present novel pulsing schemes utilizing dual frequency pulses for nonlinear ultrasound imaging.
  • To evaluate the advantages and limitations of these new pulsing schemes.
  • To investigate harmonic generation and compare performance with single frequency pulses.

Main Methods:

  • Implementation of pulse inversion, power modulation, and power modulated pulse inversion schemes.
  • Utilizing dual frequency pulses containing a fundamental frequency (f) and its second harmonic (2f).
  • Acoustic measurements of harmonic generation and theoretical simulations using the KZK equation.

Main Results:

  • Dual frequency pulses generate sum and difference frequency components alongside other harmonics.
  • Pulse inversion, when using dual frequency pulses, now produces odd harmonic components.
  • This contrasts with single frequency pulses where only power modulation techniques yielded odd harmonics.

Conclusions:

  • Dual frequency pulsing schemes offer enhanced capabilities for nonlinear ultrasound imaging.
  • The generation of odd harmonics in pulse inversion broadens the applicability of this technique.
  • This research contributes to the advancement of ultrasound-based diagnostic tools.