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Continuous wave ultrasonic tomography.

H D Liang1, M Halliwell, P N Wells

  • 1Centre for Physics and Engineering Research in Medicine, University of Bristol, Bristol General Hospital, Bristol BS1 6SY UK. haidong.liang@bristol.ac.uk

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|May 23, 2001
PubMed
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This study introduces a novel method for cross-sectional imaging using continuous wave (CW) ultrasound. By analyzing Doppler-shifted echoes from rotating objects, tomographic projections are generated to reconstruct internal scattering center distributions.

Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Acoustics

Background:

  • Doppler shifts in ultrasonic echoes depend on scatterer velocities.
  • Objects rotating in a stationary ultrasonic beam generate frequency-dependent Doppler shifts.
  • These frequency shifts relate to the spatial distribution of scattering centers.

Purpose of the Study:

  • To investigate the use of continuous wave (CW) ultrasound for cross-sectional imaging.
  • To develop a method for reconstructing internal object structures using Doppler ultrasound.
  • To explore the tomographic potential of Doppler-shifted ultrasonic echoes.

Main Methods:

  • Objects were rotated within a stationary ultrasonic beam.
  • Doppler-shifted backscattered echo amplitudes were measured as a function of frequency.

Related Experiment Videos

  • These amplitudes were interpreted as tomographic projections, with a microscanner used for data acquisition.
  • A tomographic reconstruction algorithm was applied to the projections.

    • Main Results:

    • The amplitude of backscattered echoes at specific frequencies corresponds to line integrals of scatterers at defined cross-ranges.
    • Rotating the object generated a continuum of projections at different positions.
    • Tomographic reconstruction successfully produced images of scattering center distribution.

    Conclusions:

    • Continuous wave (CW) ultrasound, combined with object rotation and tomographic reconstruction, enables cross-sectional imaging.
    • The technique leverages Doppler shifts to create tomographic projections.
    • Image resolution is fundamentally limited by the target size and ultrasonic wavelength.