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Small element array algorithm for correcting phase aberrations using near-field signal redundancy. Part II:

Y Li¹, B Robinson

¹CSIRO Telecommunication and Industrial Physics, West Lindfield, NSW, Australia. yue.li@tip.csiro.a

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 2, 2008

Summary

This summary is machine-generated.

This study validates a subarray algorithm for phase-aberration correction in phased arrays. The technique effectively measures and corrects angle-dependent aberrations using near-field signal redundancy.

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Area of Science:

Ultrasound imaging
Phased array systems
Wave propagation

Background:

Phase aberrations degrade image quality in ultrasound.
Near-field signal redundancy offers a method for aberration correction.
Part I introduced a small element array algorithm for this purpose.

Purpose of the Study:

To experimentally validate the phase-aberration correction algorithm proposed in Part I.
To assess the algorithm's performance on a phantom with a non-isoplanatic aberrator.
To test dynamic near-field delay correction methods on subarrays.

Main Methods:

Utilized a small element array algorithm forming subarrays to narrow beams.
Collected common midpoint signals from a phantom with an RTV silicone rubber aberrator.
Applied dynamic near-field delay correction techniques to subarrays.

Main Results:

The subarray technique successfully measured and corrected angle-dependent phase aberrations.
Experimental results confirmed the algorithm's effectiveness in a non-isoplanatic scenario.
Performance of dynamic near-field delay correction methods was experimentally verified.

Conclusions:

The validated subarray algorithm is effective for measuring and correcting phase aberrations in phased arrays.
This method holds promise for improving ultrasound image quality in the presence of complex aberrators.
Dynamic near-field delay correction is a viable approach for real-time aberration management.