Polarization Inverted Ultrasound Transducer Based on Composite Structure for Tissue Harmonic and Frequency Compound Imaging

Ultrasound transducer with polarization inversion technique (PIT) can provide dual-frequency feature for tissue harmonic imaging (THI) and frequency compound imaging (FCI). However, in the conventional PIT, the ultrasound intensity is reduced due to the multiple resonance characteristics of the comb...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2022-01, Vol.69 (1), p.273-282
Main Authors: Choi, Bo Eun, Lee, Hee Su, Sung, Jin Ho, Jeong, Eun Young, Park, Chan Yuk, Jeong, Jong Seob
Format: Article
Language:English
Subjects:
Acoustics
Apertures
Composite structures
Equipment Design
Finite Element Analysis
Finite element method
Frequency compound imaging (FCI)
Frequency control
Frequency spectrum
Harmonic analysis
Imaging
piezo-composite layer
Piezoelectricity
Polarization
polarization inversion technique (PIT)
Thickness ratio
tissue harmonic imaging (THI)
Transducers
Ultrasonic imaging
Ultrasonic transducers
Ultrasonography
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Summary:Ultrasound transducer with polarization inversion technique (PIT) can provide dual-frequency feature for tissue harmonic imaging (THI) and frequency compound imaging (FCI). However, in the conventional PIT, the ultrasound intensity is reduced due to the multiple resonance characteristics of the combined piezoelectric element, and it is challenging to handle the thin piezoelectric layer required to make a PIT-based acoustic stack. In this study, an improved PIT using a piezo-composite layer was proposed to compensate for those problems simultaneously. The novel PIT-based acoustic stack also consists of two piezoelectric layers with opposite poling directions, in which the piezo-composite layer is located on the front side and the bulk-type piezoelectric layer is located on the back side. The thickness ratio between two piezoelectric layers is 0.5:0.5, but unlike a typical PIT model, it can generate dual-frequency spectrum. A finite element analysis (FEA) simulation was conducted, and subsequently, the prototype transducer was fabricated for performance demonstration. In the simulation and experiment, the intensity was increased by 56.76% and 30.88% compared to the conventional PIT model with the thickness ratio of 0.3:0.7. Thus, the proposed PIT-based transducer is expected to be useful in implementation of THI and FCI.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2021.3109458