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Phase-aberration correction using signals from point reflectors and diffuse scatterers: measurements.
1General Electric Res. and Dev. Center, Schenectady, NY.
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.
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.
