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Optimized Backing Layers Design for High Frequency Broad Bandwidth Ultrasonic Transducer | IEEE Journals & Magazine | IEEE Xplore

Optimized Backing Layers Design for High Frequency Broad Bandwidth Ultrasonic Transducer


Abstract:

Ultrasonic transducers with broad bandwidth are considered to have high axial resolution and good ultrasound scanning flexibility for the clinical applications. The limit...Show More

Abstract:

Ultrasonic transducers with broad bandwidth are considered to have high axial resolution and good ultrasound scanning flexibility for the clinical applications. The limitations of spatial resolution due to bandwidth are of great concern in ultrasound medical imaging. The method of acoustic impedance matching between the piezoelectric element and medium is commonly used to obtain broad bandwidth and high resolution. In this study, an optimized backing layer design was proposed to broaden the bandwidth by adding a tunable acoustic impedance matching layer of backing (AIMLB) between the backing layer and the piezoelectric ceramic element. The Mason equivalent circuit method was used to analyze the effect of the backing material composition and its structure on the bandwidth of the transducer. The optimized transducer was simulated using the finite-element method with the PZFlex software. Based on the PZFlex simulations, a 20-MHz ultrasonic transducer using the AIMLB with a bandwidth of approximately 92.29% was fabricated. The experimental results were in good agreement with the simulations. The ultrasonic imaging indicated that the designed ultrasonic transducer with an additional AIMLB had high performance with good imaging capability.
Published in: IEEE Transactions on Biomedical Engineering ( Volume: 69, Issue: 1, January 2022)
Page(s): 475 - 481
Date of Publication: 21 July 2021

ISSN Information:

PubMed ID: 34288870

Funding Agency:


References

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