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Dual-frequency transducer for nonlinear contrast agent imaging.

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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|December 4, 2013

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This study introduces a novel dual-element transducer for enhanced microbubble imaging. The new design successfully detects high-frequency nonlinear components, improving contrast agent imaging sensitivity and resolution.

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Area of Science:

Medical Imaging
Biomedical Engineering
Acoustics

Background:

Microbubble-based contrast imaging relies on detecting nonlinear components.
Current limitations in transducer sensitivity and bandwidth hinder the detection of high-order harmonics (3rd-5th).

Purpose of the Study:

To develop a novel dual-element transducer for improved high-frequency nonlinear contrast imaging.
To overcome the limitations of existing transducers in detecting high-order harmonics from microbubbles.

Main Methods:

Designed a transducer with a 4 MHz low-frequency (LF) transmit element and a 14 MHz high-frequency (HF) receive element.
Fabricated the transducer using lead zirconate titanate (PZT) paste and commercial PZT, with a porous PZT backing.
Characterized piezoelectric elements and performed hydrophone measurements to assess electroacoustic responses and radiation patterns, demonstrating a 70% bandwidth for the HF element.

Main Results:

The fabricated HF transducer exhibited a large bandwidth (70% at -3 dB).
Successfully detected microbubble harmonic components up to the sixth harmonic.
Acquired images from a flow phantom, showcasing the transducer's potential for high-frequency nonlinear contrast imaging.

Conclusions:

The proposed dual-element transducer design enables sensitive detection of high-order nonlinear components from microbubbles.
This advancement offers significant potential for high-frequency nonlinear contrast imaging applications.
The simple fabrication process and demonstrated performance highlight the transducer's practical utility.