BEE 532 Ultrasound Doppler

Instructor: Matthew Bruce / mbruce@uw.edu

University of Washington

Agenda for this week


  • Doppler signal path (dopp.html).
  • Doppler sequence (Doppler_Review.pdf.)
  • Finish Lasse slides (Lasse.pdf).
  • Run Hmwk scripts.
  • Start colorflow (Doppler_Review.pdf and colorflow.pdf).

Doppler Signal Path

Note: x[n-τ] is complex composed of both IQ, which is then windowed, wall filtered and then Fourier transformed, producing spectral columns.

Doppler shift vs velocity for different frequencies

Doppler shift vs frequencies for different transmit frequencies.

Doppler shift vs velocity for different frequencies

Assessing direction with just amplitude

Utility of using complex/IQ

Nonlinear signals from microbubbles

Nonlinear signals from Microbubbles

Harmonic oscillator analogs to bubble dynamics

(Fig 2.3, Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging, Lars Hoff)

Radius time curve for Sonazoid bubble for increasing acoustic pressure for a pulse inversion scenario (Fig 8.6, Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging, Lars Hoff).

Scattered pressure for Sonazoid bubble for increasing acoustic pressure for a pulse inversion scenario (Fig 8.3, Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging, Lars Hoff).

Resulting frequency response for Sonazoid bubble for increasing acoustic pressure for a pulse inversion scenario (Fig 8.5, Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging, Lars Hoff).

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