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Phase-aberration correction using signals from point reflectors and diffuse scatterers: basic principles.

S W Flax1, M O'Donnell

  • 1General Electric Med. Syst., Milwaukee, WI.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1988
PubMed
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This study introduces a novel method for correcting phase aberrations in coherent imaging systems. The technique accurately measures phase errors using signals from random scatterers, eliminating the need for a beacon signal.

Area of Science:

  • Coherent Imaging Systems
  • Wavefront Sensing and Correction

Background:

  • Phase aberrations, caused by refractive index variations, degrade image quality in coherent imaging.
  • Existing methods often rely on beacon signals or point reflectors, limiting applicability.

Purpose of the Study:

  • To develop a novel method for accurate phase aberration measurement and correction.
  • To eliminate the requirement for beacon signals in phase error estimation.

Main Methods:

  • Utilizes signals from a sampled aperture (transducer array).
  • Employs a correlation approach, similar to adaptive optics and radar.
  • Leverages signals from random scatterers for phase aberration determination.

Main Results:

Related Experiment Videos

  • Accurate measurement of phase aberrations without a beacon signal.
  • Demonstrated applicability to medical ultrasound, radar, and sonar systems.

    • Conclusions:

    • The proposed method offers a robust solution for phase aberration correction in diverse coherent imaging applications.
    • Removal of beacon dependency enhances the versatility and practicality of the technique.