Development of Multiple-Frequency Ultrasonic Imaging System Using Multiple Resonance Piezoelectric Transducer

Akiyama, Iwaki; Yoshizumi, Natsuki; Saito, Shigemi; Wada, Yasuhiko; Koyama, Daisuke; Nakamura, Kentaro

doi:10.7567/jjap.51.07gf02

Cited by 10 publications

(8 citation statements)

References 20 publications

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“…The piezoelectric effect is the conversion of kinetic energy due to mechanical stress to electrical energy, and vice versa. For years, piezoelectric transducers have been used for numerous purposes going from “sonar,” used in World War 2 to detect submarines [89] to modern-day applications such as non-destructive testing [90], energy harvester [91,92], and biomedical imaging [93,94,95,96]. Even though piezoelectric and photoacoustic effects were discovered in the 1800s, it was only in 1994 when the research of Kruger [97] reignited researchers’ interest in using PAI for biomedical applications.…”

Section: Detectorsmentioning

confidence: 99%

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Chan

Zheng

Bell

et al. 2019

Sensors

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Photoacoustic imaging (PAI) is an emerging imaging technique that bridges the gap between pure optical and acoustic techniques to provide images with optical contrast at the acoustic penetration depth. The two key components that have allowed PAI to attain high-resolution images at deeper penetration depths are the photoacoustic signal generator, which is typically implemented as a pulsed laser and the detector to receive the generated acoustic signals. Many types of acoustic sensors have been explored as a detector for the PAI including Fabry–Perot interferometers (FPIs), micro ring resonators (MRRs), piezoelectric transducers, and capacitive micromachined ultrasound transducers (CMUTs). The fabrication technique of CMUTs has given it an edge over the other detectors. First, CMUTs can be easily fabricated into given shapes and sizes to fit the design specifications. Moreover, they can be made into an array to increase the imaging speed and reduce motion artifacts. With a fabrication technique that is similar to complementary metal-oxide-semiconductor (CMOS), CMUTs can be integrated with electronics to reduce the parasitic capacitance and improve the signal to noise ratio. The numerous benefits of CMUTs have enticed researchers to develop it for various PAI purposes such as photoacoustic computed tomography (PACT) and photoacoustic endoscopy applications. For PACT applications, the main areas of research are in designing two-dimensional array, transparent, and multi-frequency CMUTs. Moving from the table top approach to endoscopes, some of the different configurations that are being investigated are phased and ring arrays. In this paper, an overview of the development of CMUTs for PAI is presented.

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Section: Detectorsmentioning

confidence: 99%

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Chan

Zheng

Bell

et al. 2019

Sensors

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“…[365][366][367][368][369][370][371][372][373][374] In biomedical ultrasound, these measurements usually require special transducers that are small and tough, sensitive due to the limitation of ultrasound power to ensure human safety, or have a wideband to increase image resolution. To support these measurements, ultrasonic transducers [375][376][377][378][379][380][381] and acoustic field measurement and control techniques have actively been researched. [382][383][384][385][386] The dynamics of microbubbles have also been investigated owing to the high demand for the use of ultrasound contrast agents for diagnostic and therapeutic applications.…”

Section: Biomedical Ultrasoundmentioning

confidence: 99%

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

Mizutani¹,

Wakatsuki²,

Ebihara³

2016

Jpn. J. Appl. Phys.

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Measurementthe act of measuring physical properties that we performhas the potential to contribute to the successful advancement of sciences and society. To open doors in physics and other sciences, various measurement methods and related applications have been developed, and ultrasound has remained a useful probe, power source, and interesting measurement object for the past two centuries. In this paper, we first summarize the basic principles of ultrasound from the viewpoint of measurement techniques for readers who just have started studying or are interested in the field of ultrasonic electronics. Moreover, we also introduce recent studiesultrasonic properties of materials, measurement techniques, piezoelectric devices, nonlinear acoustics, biomedical ultrasound, and ocean acousticsand their trends related to measurement techniques in ultrasonic electronics to provide some ideas for related applications.

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“…A spherically diverging wave, which can illuminate a wider region, was transmitted to solve the problem of the limited width of a plane wave. An ultrasonic image of a blood pool, which is filled with blood particles (scatterers), has a speckle-like texture 21,22) because the constructive and destructive interferences among echoes from many scatterers much smaller than the wavelength of transmitted ultrasound occur in the focal point, as shown in Fig. 2.…”

Section: Parallel Receive Beamforming With Spherically Diverging Wave...mentioning

confidence: 99%

Echo speckle imaging of blood particles with high-frame-rate echocardiography

Takahashi

Hasegawa

Kanai

2014

Jpn. J. Appl. Phys.

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Cardiac blood flow patterns such as the vortex flow pattern inside the left ventricle have been studied to provide new information for the diagnosis of the pumping function of the human heart. Complex blood flow is visualized by imaging echo speckles of blood particles because the speckle-like texture translates to the motion of blood particles. We proposed an imaging method for echo speckles of blood particles using high-frame-rate ultrasound for the visualization of the intracardiac blood flow direction. High-frame-rate ultrasound is useful for continuously observing the fast motion of echoes from blood particles in the heart. In the present study, weighting by coherence and compounding the magnitudes of echo signals in different transmissions were introduced to visualize weak echoes from blood particles. The feasibility of the visualization of cardiac blood flow using high-frame-rate ultrasound was demonstrated by basic and in vivo experiments.

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Development of Multiple-Frequency Ultrasonic Imaging System Using Multiple Resonance Piezoelectric Transducer

Cited by 10 publications

References 20 publications

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

Echo speckle imaging of blood particles with high-frame-rate echocardiography

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