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

M O'Donnell¹, S W Flax

¹General Electric Res. and Dev. Center, Schenectady, NY.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 1, 1988

Summary

This study demonstrates an effective phase-aberration correction method for ultrasound imaging. The technique significantly reduces image distortion caused by near-field velocity inhomogeneities, improving image quality.

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Area of Science:

Medical Imaging
Acoustics
Signal Processing

Background:

Phased-array imaging systems, particularly in clinical ultrasound, are susceptible to image distortion.
Near-field velocity inhomogeneities can cause significant phase aberrations, degrading image quality.

Purpose of the Study:

To evaluate a novel phase-aberration correction method for phased-array imaging.
To assess the effectiveness of the correction method in mitigating near-field aberrations in ultrasound simulations.

Main Methods:

A physical model using grooved room-temperature vulcanizing plates was developed to simulate near-field aberrations.
An iterative aberration correction algorithm utilizing cross-correlation measures between neighboring array elements was implemented.
The algorithm processed signals reflected from diffuse scatterers to estimate and correct aberrations.

Main Results:

Grooved plates induced substantial image distortion, as anticipated.
The iterative cross-correlation-based correction procedure effectively reduced aberration effects.
Corrected images closely resembled those obtained without any simulated aberrations.

Conclusions:

The developed phase-aberration correction method is practical for medical ultrasound imaging.
This approach shows potential for application in all coherent imaging systems using sampled apertures.