Multi-frequency CMUT imaging arrays for multi-scale imaging and imaging-therapy applications

Maadi, Mohammad; Greenlay, Benjamin; Ceroici, Christopher; Zemp, Roger J.

doi:10.1109/ultsym.2017.8092905

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Another research topic being explored for PAI is the multi-frequency CMUT array. A high-frequency transducer produces images with higher resolution and finer details while a low-frequency transducer experiences lesser attenuation and therefore produces images with higher SNR at deeper penetration depth [131]. With the huge frequency content produced by the tissue from the laser illumination, a multi-frequency CMUT array, where elements of different frequencies are arranged, can be used to capture both the outline and the fine details of the structure at varying depths.…”

Section: Development Of Capacitive Micromachined Ultrasound Transdmentioning

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: Development Of Capacitive Micromachined Ultrasound Transdmentioning

confidence: 99%

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Chan

Zheng

Bell

et al. 2019

Sensors

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show abstract

“…Chee et al [15,16] used the staggered arrangement of membranes with radius of 82 µm and 36 µm to fabricate a multi-frequency ultrasonic transducer. Tests show that the working frequency of the ultrasonic transducer in the water is from 0.6 to 7.32 MHz, and the relative bandwidth of −6 dB reaches 170%.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Cell Structure for Wideband CMUT: Design Method and Characteristic Analysis

Wang¹,

Huang²,

Yu³

et al. 2021

Micromachines

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Capacitive micromachined ultrasonic transducer (CMUT) is an ultrasonic transducer based on the microelectromechanical system (MEMS). Wideband CMUT has good application prospects in ultrasonic imaging, ultrasonic identification, flow measurement, and nondestructive testing due to its excellent characteristics. This paper studies the method of increasing the bandwidth of the CMUT, proposes the structure of the wideband CMUT with a hybrid cell structure, and analyzes the design principles and characteristics of the wideband CMUT structure. By changing the cell spacing and the number of cells of different sizes composing the CMUT, we analyze the simulation of the effect of the spacing and number on the CMUT bandwidth, thereby optimizing the bandwidth characteristics of the CMUT. Next, the selection principle of the main structural parameters of the wideband CMUT is analyzed. According to the proposed principle, the CMUT in the air and water are designed and simulated. The results prove that both the air and water CMUT meet the design requirements. The design rules obtained in this paper can provide theoretical guidance for the selection of the main structural parameters of the wideband CMUT.

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Design and Fabrication of 1-D CMUT Arrays for Dual-Mode Dual-Frequency Acoustic Angiography Applications

Annayev,

Minhaj,

Adelegan

et al. 2024

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Multi-frequency CMUT imaging arrays for multi-scale imaging and imaging-therapy applications

Cited by 3 publications

References 5 publications

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Photoacoustic Imaging with Capacitive Micromachined Ultrasound Transducers: Principles and Developments

Hybrid Cell Structure for Wideband CMUT: Design Method and Characteristic Analysis

Design and Fabrication of 1-D CMUT Arrays for Dual-Mode Dual-Frequency Acoustic Angiography Applications

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