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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System

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Nonlinear ultrasonic phased array imaging.

J N Potter¹, A J Croxford¹, P D Wilcox¹

¹Faculty of Engineering, University of Bristol, Queen's Building, University Walk, Bristol BS8 1TR, United Kingdom.

Physical Review Letters

|October 18, 2014

Summary

This summary is machine-generated.

This study introduces a new acoustic nonlinearity imaging technique. It measures localized wave distortion without direct inspection, enabling deeper nonlinear imaging.

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Area of Science:

Acoustics
Nonlinear Ultrasonics
Materials Imaging

Background:

Acoustic nonlinearity is a key indicator of material damage and changes.
Traditional methods for detecting acoustic nonlinearity often require direct interrogation of the wave at the inspection point.
Imaging nonlinear acoustic properties deep within materials remains a challenge.

Purpose of the Study:

To develop and demonstrate a novel technique for imaging acoustic nonlinearity.
To measure acoustic nonlinearity localized to a focal point using ultrasonic arrays.
To enable nonlinear imaging through depth without direct wave interrogation.

Main Methods:

Utilizing delayed parallel element transmission with an ultrasonic array to generate a diffuse field.
Comparing the energy of this diffuse field with data from postprocessing sequential transmissions.
Inferring spatially isolated wave distortion based on energy differences.

Main Results:

Successfully demonstrated a technique for imaging acoustic nonlinearity.
Quantified nonlinearity localized to the focal point of an ultrasonic array.
Showcased the ability to infer wave distortion without interrogating the wave at the inspection point.

Conclusions:

The developed technique allows for nonlinear imaging through depth.
This method overcomes limitations of traditional nonlinear acoustic imaging.
Offers a promising approach for non-destructive evaluation and material characterization.