Optimized Backing Layers Design for High Frequency Broad Bandwidth Ultrasonic Transducer

Hou, Chenxue; Fei, Chunlong; Li, Zhaoxi; Zhang, Shuxiao; Man, Jiujing; Chen, Dongdong; Wu, Ruizhi; Li, Di; Yang, Yanchao; Feng, Wei

doi:10.1109/tbme.2021.3098567

Cited by 16 publications

(2 citation statements)

References 38 publications

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“…The finite element simulation has been proved to be an efficient simulation method by many previous studies ( Hou et al, 2021 ; Li et al, 2021b ; Lin et al, 2021 ). In this study, the finite element simulation model was established to design the half-concave structure and simulate the performance of the half-concave ultrasonic transducer with the software PZFlex and Comsol.…”

Section: Methods and Resultsmentioning

confidence: 99%

An Optimized Miniaturized Ultrasound Transducer for Transcranial Neuromodulation

Hou

Fei

et al. 2022

Front. Neurosci.

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Transcranial ultrasound stimulation (TUS) is a young neuromodulation technology, which uses ultrasound to achieve non-invasive stimulation or inhibition of deep intracranial brain regions, with the advantages of non-invasive, deep penetration, and high resolution. It is widely considered to be one of the most promising techniques for probing brain function and treating brain diseases. In preclinical studies, developing miniaturized transducers to facilitate neuromodulation in freely moving small animals is critical for understanding the mechanism and exploring potential applications. In this article, a miniaturized transducer with a half-concave structure is proposed. Based on the finite element simulation models established by PZFlex software, several ultrasound transducers with different concave curvatures were designed and analyzed. Based on the simulation results, half-concave focused ultrasonic transducers with curvature radii of 5 mm and 7.5 mm were fabricated. Additionally, the emission acoustic fields of the ultrasonic transducers with different structures were characterized at their thickness resonance frequencies of 1 MHz using a multifunctional ultrasonic test platform built in the laboratory. To verify the practical ability for neuromodulation, different ultrasound transducers were used to induce muscle activity in mice. As a result, the stimulation success rates were (32 ± 10)%, (65 ± 8)%, and (84 ± 7)%, respectively, by using flat, #7, and #5 transducers, which shows the simulation and experimental results have a good agreement and that the miniaturized half-concave transducer could effectively converge the acoustic energy and achieve precise and effective ultrasonic neuromodulation.

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Section: Methods and Resultsmentioning

confidence: 99%

An Optimized Miniaturized Ultrasound Transducer for Transcranial Neuromodulation

Hou

Fei

et al. 2022

Front. Neurosci.

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“…These results are attributed to the acoustic properties of the FPCB matching layer which exhibited an acoustic impedance closer to 7 MRayl and high thickness uniformity. The ultrasound transmission performance of the 1D linear ultrasound transducer array can be further enhanced by applying highly attenuating material as a backing layer at the backside of the piezoelectric element [ 31 , 32 , 33 ]. The effect of the type and the structure of the backing layer on the performance of the 1D linear ultrasound transducer array should be further studied.…”

Section: Resultsmentioning

confidence: 99%

FPCB as an Acoustic Matching Layer for 1D Linear Ultrasound Transducer Arrays

Lee

Jung

Lee

et al. 2022

Sensors

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An acoustic matching layer is an essential component of an ultrasound transducer to achieve maximum ultrasound transmission efficiency. Here, we develop a flexible printed circuit board (FPCB) with a composite structure consisting of multiple polyimide and copper layers and demonstrate it as a novel acoustic matching layer. With a flexible substrate and robust ACF bonding, the FPCB not only serves as an acoustic matching layer between piezoelectric elements and the surrounding medium but also as a ground for the electrical connection between the transducer array elements and the folded substrate. A 1D linear ultrasound transducer array with the FPCB matching layer exhibits larger output pressure, wider -3dB bandwidth, and higher ultrasound beam intensity compared to that of an ultrasound transducer array with the alumina/epoxy matching layer, which is one of the most commonly applied composite matching layers. The enhanced transmission performance verifies that the proposed FPCB is an excellent matching layer for 1D linear ultrasound transducer arrays.

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Adjusted power of class D-ZVS resonant inverter controlled by buck converter for LCLC resonant tank

Jittakort,

Kitcharoenwat

2023

J. Power Electron.

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Optimized Backing Layers Design for High Frequency Broad Bandwidth Ultrasonic Transducer

Cited by 16 publications

References 38 publications

An Optimized Miniaturized Ultrasound Transducer for Transcranial Neuromodulation

An Optimized Miniaturized Ultrasound Transducer for Transcranial Neuromodulation

FPCB as an Acoustic Matching Layer for 1D Linear Ultrasound Transducer Arrays

Adjusted power of class D-ZVS resonant inverter controlled by buck converter for LCLC resonant tank

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