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Time-shift estimation and focusing through distributed aberration using multirow arrays.

J C Lacefield1, R C Waag

  • 1Department of Electrical and Computer Engineering, University of Rochester, NY 14627, USA. lacefiel@ece.rochester.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 22, 2002
PubMed
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Ultrasonic transducer element height impacts time-shift estimation and focus compensation. Coarser element pitches reduce aberration correction effectiveness, highlighting the need for smaller elements in multirow arrays for better ultrasound imaging.

Area of Science:

  • Ultrasound physics
  • Medical imaging technology
  • Acoustic transducer design

Background:

  • Ultrasound imaging relies on accurate beam formation.
  • Aberrations in tissue degrade image quality.
  • Transmit focus compensation techniques aim to restore image resolution.

Purpose of the Study:

  • To experimentally investigate the effect of element height on time-shift estimation.
  • To evaluate the impact of element pitch on transmit focus compensation effectiveness.
  • To provide design guidelines for multirow ultrasonic arrays used in aberration correction.

Main Methods:

  • Emulation of multirow ultrasonic transducer arrays using a 2D array.
  • Acquisition of pulse-echo data through tissue-mimicking aberrators.

Related Experiment Videos

  • Estimation of time-shift maps for transmit focus compensation.

    • Main Results:

    • Focus restoration was significantly less effective for "1.75-D" arrays with coarse row pitches (5.4 mm) compared to fine pitches (0.6 mm, 1.8 mm).
    • Mean -20 dB lateral beamwidths increased from 5.2 mm (fine pitch) to 9.5 mm (coarse pitch) under strong aberration.
    • Time-shift maps from coarse pitch arrays showed discontinuities due to low signal correlation.

    Conclusions:

    • Element dimensions in multirow arrays for aberration correction should be significantly smaller than the aberration correlation length (ideally 25-30%).
    • Coarse element pitches compromise the accuracy of time-shift estimation and the effectiveness of focus compensation.
    • Optimized element design is crucial for advanced ultrasound aberration correction techniques.