Teng Ma

Shenzhen Institutes of Advanced Technology

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Qifa Zhou

University of Southern California

Hairong Zheng

Chinese Academy of Sciences

Qi Zhang

Guilin Medical University

K. Kirk Shung

University of Southern California

Yongchuan Li

University of Malaya

Jiqing Huang

Chimie et Biologie des Membranes et des Nanoobjects

Zhongping Chen

Beckman Laser Institute and Medical Clinic

Jiamei Liu

Tianjin Medical University Cancer Institute and Hospital

Congzhi Wang

Shenzhen Institutes of Advanced Technology

Ye Yang

Henan Polytechnic University

Cooperative Institutions

Chinese Academy of Sciences

167

Shenzhen Institutes of Advanced Technology

120

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

Chinese Academy of Medical Sciences & Peking Union Medical College

Sun Yat-sen University

Sichuan University

Shanghai Jiao Tong University

University of Southern California

Zhejiang University

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Quantitative Assessment of Thin-Layer Tissue Viscoelastic Properties Using Ultrasonic Micro-Elastography With Lamb Wave Model

IEEE Transactions on Medical Imaging (2018)

Cho-Chiang Shih Xuejun Qian Teng Ma Zhaolong Han Chien‐Chung Huang

Characterizing the viscoelastic properties of thin-layer tissues with micro-level thickness has long remained challenging. Recently, several micro-elastography techniques have been developed to improve the spatial resolution. However, most of these techniques have not considered the medium boundary conditions when evaluating the viscoelastic properties of thin-layer tissues such as arteries and corneas; this might lead to estimation bias or errors. This paper aims to integrate the Lamb wave model with our previously developed ultrasonic micro-elastography imaging system for obtaining accurate viscoelastic properties in thin-layer tissues. A 4.5-MHz ring transducer was used to generate an acoustic radiation force for inducing tissue displacements to produce guided wave, and the wave propagation was detected using a confocally aligned 40-MHz needle transducer. The phase velocity and attenuation were obtained from k-space by both the impulse and the harmonic methods. The measured phase velocity was fit using the Lamb wave model with the Kelvin-Voigt model. Phantom experiments were conducted using 7% and 12% gelatin and 1.5% agar phantoms with different thicknesses (2, 3, and 4 mm). Biological experiments were performed on porcine cornea and rabbit carotid artery ex vivo. Thin-layer phantoms with different thicknesses were confirmed to have the same elasticity; this was consistent with the estimates of bulk phantoms from mechanical tests and the shear wave rheological model. The trend of the measured attenuations was also confirmed with the viscosity results obtained using the Lamb wave model. Through the impulse and harmonic methods, the shear viscoelasticity values were estimated to be 8.2 kPa for $0.9~\text {Pa}{\cdot} \text {s}$ and 9.6 kPa for $0.8~\text {Pa}{\cdot} \text {s}$ in the cornea and 27.9 kPa for $0.1~\text {Pa}\cdot \text {s}$ and 26.5 kPa for $0.1~\text {Pa}\cdot \text {s}$ in the artery.

Acoustic Radiation Force

Elasticity

Phase velocity

Lamb waves

10.1109/tmi.2018.2820157

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Citations (53)

Front Cover

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control (2022)

Weicen Chen Qi Zhang Jiamei Liu Shuang Lei Yongchuan Li

Front cover

10.1109/tuffc.2022.3173117

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Influence of the punch with concave cutting-edge on the blanking force in micro punching process

Procedia CIRP (2022)

Teng Ma Yang Junfeng Zuyuan Yu Guodong Li Wataru Natsu

Micro blanking machining is a promising manufacture technology to realize mass production of micro parts efficiently. In the process of blanking, the blanking force is significant to the punch, die, and sheet workpiece. In order to investigate the influence of cutting-edge shape of the punch on the micro blanking process, a self-developed micro combined EDM and blanking machine tool is applied in this paper. A punch with concave cutting-edge is capable to be fabricated online through a series of processing based on micro EDM: 3D milling, wire electrical discharge grinding and reverse EDM copy machining techniques. Then the punch and die are accurately matched online due to the preparation of them in the same coordinate system. Micro blanking parts and punching parts with the complex cross-sectional shape is obtained by using the online fabricated punch with flat cutting-edge and concave cutting-edge respectively in the workpiece of stainless steel SUS304 foil. The characteristic of blanking force varying with time indicates that the blanking force is significantly reduced in the case of concave cutting-edge, meanwhile, both blanking parts and punching parts have the high quality.

Blanking

10.1016/j.procir.2022.09.126

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Design and Simulation of Piezoelectric Micro-Cantilever Ultrasonic Transducers for Audio Directional Loudspeakers

2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems (2008)

Teng Ma Chenguang Cai Limei Xu Leon Xu Xia Wang

This paper presents a piezoelectric multilayered microcantilever structure as a micro-electro-mechanical system (MEMS) transducer. The proposed micro-transducer is designed for novel audio directional loudspeaker for mobile communication devices. To obtain optimum design parameters and predict the cantilever performance before actual fabrication, the mechanical and electro-mechanical performance was simulated by the finite element method and further validated with theoretical calculation. Finally the fabrication process steps are proposed.

10.1115/micronano2008-70135

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Transformable Ultrasonic Array Transducer for Multiscale Imaging and Beamforming

IEEE Transactions on Industrial Electronics (2021)

Qi Zhang Teng Ma Congzhi Wang Xiangli Liu Yongchuan Li

Conventional ultrasound probes have inherent limitations in some application scenarios. Because of their fixed shapes and sizes, they can hardly pass through small orifices to examine the target closely. With the recent development of microelectromechanical systems and flexible electronic technologies, collapsible and self-assembling devices are being considered as a potential approach to address this problem. This article presents an innovative transformable ultrasonic transducer (TUT), which can transform between a one-dimensional (1-D) linear array and a 2-D planar array with the ability of switching between different functions including 2-D/3-D imaging and high-intensity focused ultrasound beamforming. The transforming process is accomplished with a specially designed flexible printed circuit board inspired by a paper-folding mechanism. The electrical and acoustic properties of the developed transducer along with the acoustic field distribution in its different forms have been characterized. The 2-D/3-D imaging performances of the TUT have been also evaluated under 1-D and 2-D configurations, respectively. In addition, the performance of a focused concave transforming mode has been also discussed. The evaluation results suggest that TUT can maintain its performance under different structures with precise transforming control. The TUT device has the potential to considerably expand the applications of industrial and clinical ultrasound.

Planar array

10.1109/tie.2021.3065592

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Citations (8)

Design and Fabrication of a High-Frequency Microconvex Array Transducer for Small Animals Imaging

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control (2022)

Weicen Chen Qi Zhang Jiamei Liu Shuang Lei Yongchuan Li

High-frequency convex array transducer, featuring both high spatial resolution and wide field of view, has been successfully developed for ophthalmic imaging. To further expand its application range to small animals' imaging, this work develops a high-frequency microconvex array transducer possessing smaller aperture size and wider scanning angle. This transducer featured 128 array elements arranged in a curvilinear 2-2 piezoelectric composite configuration, yielding a maximum view angle of 97.8°. The array was composed of two front matching layers, a nonconductive backing layer, and a customized flexible circuit that electrically connected array elements to coaxial cables. The center frequency and the -6-dB fractional bandwidth were about 18.14 MHz and 69.15%, respectively. The image of a tungsten wire phantom resulted in approximately 62.9- [Formula: see text] axial resolution and 121.3- [Formula: see text] lateral resolution. The image of the whole kidney of a rat as well as its internal arteries was acquired in vivo, demonstrating the imaging capability of the proposed high-frequency microconvex array transducers for small animals' imaging applications.

Center frequency

Coaxial

Aperture (computer memory)

Phased array ultrasonics

10.1109/tuffc.2022.3146309

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Citations (13)

A Quantitative Method for Reasoning about Knowledge

Qian Lan Teng Ma

It is important to reason about the possibility of certain events as well as the knowledge of agents in many of application areas for reasoning about knowledge. This paper proposes the concept of belief degree of an agent with respect to a fact. Moreover, based on the belief degree of agent, the similarity degree between agent 's graded knowledge and a pseudo metric on the set of agent 's graded knowledge are established, which makes it possible for agent to develop approximate reasoning by using its graded knowledge and provides a quantitative framework for reasoning about knowledge.

Similarity (geometry)

Degree (music)

Qualitative reasoning

10.1109/aici.2009.317

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Ultrasonic tunable focusing by a stretchable phase-reversal Fresnel zone plate

Applied Physics Letters (2020)

Xiangxiang Xia Yongchuan Li Feiyan Cai Hui Zhou Teng Ma

This paper reports a stretchable silicone phase-reversal (PR) Fresnel zone plate (FZP) that can focus ultrasonic energy at different focal lengths with a high transmission coefficient in water. Unlike a traditional FZP that creates focused by constructive interference of waves diffracted through open annular zones in an opaque screen, the silicone PR-FZP takes advantage of all the zones of the FZP contribute to the focal area by adding phase compensation regions instead of opaque regions. More interestingly, the silicone PR-FZP can be stretched, and the focal length increases gradually with the unchanged full width at half maximum as the PR-FZP is stretched. The aforementioned performance aspects are verified in both experiments and simulations. The proposed stretchable PR-FZP with a tunable focal length has potential applications in the broad field of ultrasonics, such as ultrasonic imaging and ultrasound neuromodulation.

Zone plate

Opacity

Fresnel zone

10.1063/5.0018663

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Citations (23)

SR-DSFF and FENet-ReID: A Two-Stage Approach for Cross Resolution Person Re-Identification

Computational Intelligence and Neuroscience (2022)

Zongzong Wu Xiangchun Yu Donglin Zhu Qingwei Pang Shitao Shen

In real-life scenarios, the accuracy of person re-identification (Re-ID) is subject to the limitation of camera hardware conditions and the change of image resolution caused by factors such as camera focusing errors. People call this problem cross-resolution person Re-ID. In this paper, we improve the recognition accuracy of cross-resolution person Re-ID by enhancing the image enhancement network and feature extraction network. Specifically, we treat cross-resolution person Re-ID as a two-stage task: the first stage is the image enhancement stage, and we propose a Super-Resolution Dual-Stream Feature Fusion sub-network, named SR-DSFF, which contains SR module and DSFF module. The SR-DSFF utilizes the SR module recovers the resolution of the low-resolution (LR) images and then obtains the feature maps of the LR images and super-resolution (SR) images, respectively, through the dual-stream feature fusion with learned weights extracts and fuses feature maps from LR and SR images in the DSFF module. At the end of SR-DSFF, we set a transposed convolution to visualize the feature maps into images. The second stage is the feature acquisition stage. We design a global-local feature extraction network guided by human pose estimation, named FENet-ReID. The FENet-ReID obtains the final features through multistage feature extraction and multiscale feature fusion for the Re-ID task. The two stages complement each other, making the final pedestrian feature representation has the advantage of accurate identification compared with other methods. Experimental results show that our method improves significantly compared with some state-of-the-art methods.

Feature (linguistics)

Identification

10.1155/2022/4398727

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Citations (1)

Quantified elasticity mapping of retinal tissue using acoustic radiation force optical coherence elastography

Investigative Ophthalmology & Visual Science (2017)

Yueqiao Qu Youmin He Yi Zhang Teng Ma Jiang Zhu

Acoustic Radiation Force

Elasticity

Source

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Citations (1)