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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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Time-reversal acoustic focusing system as a virtual random phased array.

Armen Sarvazyan¹, Laurent Fillinger, Leonid Gavrilov

¹Artann Laboratories, West Trenton, NJ, USA. armen@artannlabs.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|April 10, 2010

Summary

Time-reversed acoustics (TRA) focusing systems offer comparable performance to conventional 2-D phased arrays (PA) for dynamic ultrasonic focusing. Simple TRA systems can generate complex, steerable focused ultrasound fields efficiently.

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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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Published on: March 6, 2019

Area of Science:

Acoustics
Wave Physics
Biomedical Engineering

Background:

Dynamic focusing of ultrasonic waves is crucial for applications in medical imaging and therapy.
Conventional 2-D phased arrays (PA) require complex electronics and numerous elements for precise focusing.
Time-reversed acoustics (TRA) presents an alternative approach for acoustic focusing.

Purpose of the Study:

To compare the performance of a TRA focusing system (TRA FS) with conventional 2-D PAs for dynamic ultrasonic focusing.
To evaluate the complexity and steerability of focused fields generated by both systems.
To assess the feasibility of realizing a TRA FS with simple, cost-effective components.

Main Methods:

Experimental implementation of a TRA FS using a liquid-filled reverberator with 4 piezotransducers.
Mathematical simulation of 2-D PAs with varying numbers of elements (tens to hundreds).
Comparison of focused ultrasonic fields generated by both systems at a center frequency of approximately 600 kHz, using identical apertures.

Main Results:

The TRA FS, despite using a small number of channels, achieved complex focused patterns.
Steering efficiency of the TRA FS was comparable to PAs with hundreds of elements.
A simple TRA FS was successfully realized using a water-filled plastic bottle with few piezotransducers.

Conclusions:

TRA focusing systems offer a viable and efficient alternative to conventional PAs for dynamic ultrasonic focusing.
The simplicity and cost-effectiveness of TRA FS make them attractive for various applications.
Further research can explore advanced configurations of TRA for enhanced ultrasonic focusing capabilities.