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Parallel transmit beamforming using orthogonal frequency division multiplexing applied to harmonic imaging--a

Libertario Demi1, Martin D Verweij, Koen W A Van Dongen

  • 1Laboratory of Acoustical Wavefield Imaging, Faculty of Applied Sciences, Delft University of Technology, The Netherlands. L.Demi@TUDelft.nl

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 30, 2012
PubMed
Summary

This study introduces a novel ultrasound harmonic imaging technique. By reversing beamforming and using orthogonal frequency division multiplexing (OFDM), it significantly enhances harmonic signal amplitude and reduces side lobes for clearer medical imaging.

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Area of Science:

  • Medical Imaging
  • Acoustics
  • Signal Processing

Background:

  • Real-time ultrasound imaging uses parallel beamforming for high data rates.
  • Harmonic imaging requires high-amplitude waves, conflicting with wide-angle transmission's acoustic pressure decay.
  • Current methods face limitations in enhancing harmonic signal amplitude.

Purpose of the Study:

  • To investigate a reversed beamforming concept for enhanced harmonic imaging.
  • To explore the use of orthogonal frequency division multiplexing (OFDM) for parallel beam transmission.
  • To improve harmonic signal amplitude and image quality in ultrasound.

Main Methods:

  • Proposed a method involving narrow parallel beam transmission and wide-angle reception.
  • Utilized orthogonal frequency division multiplexing (OFDM) to create distinct parallel transmission beams.
  • Conducted numerical simulations of beam profiles for the second-harmonic component.
  • Performed experimental verification using a single-element transducer and hydrophone.

Main Results:

  • The proposed technique achieved a 12 dB gain in the main beam compared to standard parallel beamforming.
  • Demonstrated a significant reduction in side lobes.
  • Confirmed the feasibility of exciting transducers with multiple modulated pulses.
  • Successfully generated distinguishable second-harmonic components.

Conclusions:

  • The reversed beamforming approach with OFDM is effective for harmonic imaging.
  • This method offers substantial improvements in signal amplitude and beam quality.
  • The findings support the development of advanced ultrasound diagnostic systems.