Underwater Imaging Using a 1 × 16 CMUT Linear Array

Zhang, Rui; Zhang, Wendong; He, Changde; Zhang, Yongmei; Song, Jiakun; Chen, Xue

doi:10.3390/s16030312

Cited by 12 publications

(6 citation statements)

References 26 publications

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“…Generally, CMUT is composed of many cells arranged and combined according to a certain rule to achieve the requirements of strong directivity, high sensitivity, and high transmission power [18,19]. CMUT can be designed as a rectangle and a square, as shown in Figure 1.…”

Section: Cmut Basic Structure and Its Main Parametersmentioning

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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Section: Cmut Basic Structure and Its Main Parametersmentioning

confidence: 99%

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

Wang¹,

Huang²,

Yu³

et al. 2021

Micromachines

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“…In 1981, results were reported of a transmission mode breast scanner that simultaneously imaged pulse-echo backscatter, attenuation, and speed, which showed clear delineation of breast architecture [ 18 , 19 ]. More recent research has continued to demonstrate advancement in breast ultrasound tomography with most approaches using both transmission and reflection methods [ 20 , 21 , 22 , 23 , 24 ]. Currently, the B-Mode ultrasonic tomography is used broadly in medical ultrasonic imaging [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Application of an Ultrasound Tomography Algorithm in a Novel Ring 3D Ultrasound Imaging System

Liu

Chen

Zhang

et al. 2018

Sensors

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Currently, breast cancer is one of the most common cancers in women all over the world. A novel 3D breast ultrasound imaging ring system using the linear array transducer is proposed to decrease costs, reduce processing difficulties, and improve patient comfort as compared to modern day breast screening systems. The 1 × 128 Piezoelectric Micromachined Ultrasonic Transducer (PMUT) linear array is placed 90 degrees cross-vertically. The transducer surrounds the mammary gland, which allows for non-contact detection. Once the experimental platform is built, the breast model is placed through the electric rotary table opening and into a water tank that is at a constant temperature of 32 °C. The electric rotary table performs a 360° scan either automatically or mechanically. Pulse echo signals are captured through a circular scanning method at discrete angles. Subsequently, an ultrasonic tomography algorithm is designed, and a horizontal slice imaging is realized. The experimental results indicate that the preliminary detection of mass is realized by using this ring system. Circular scanning imaging is obtained by using a rotatable linear array instead of a cylindrical array, which allows the size and location of the mass to be recognized. The resolution of breast imaging is improved through the adjustment of the angle interval (>0.05°) and multiple slices are gained through different transducer array elements (1 × 128). These results validate the feasibility of the system design as well as the algorithm, and encourage us to implement our concept with a clinical study in the future.

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“…Two key aspects to consider for underwater artificial light are optical characteristics such as its strength and spectrum, and its collimation, which is the region covered by the light. The former is accounted for by many underwater imaging and image processing methods, such as those extending underwater visibility [ 9 , 10 ]. However, no existing methods determine the importance of light collimation for underwater computer vision tasks.…”

Section: Introductionmentioning

confidence: 99%

Underwater Object Segmentation Based on Optical Features

Chen

Zhang

et al. 2018

Sensors

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Underwater optical environments are seriously affected by various optical inputs, such as artificial light, sky light, and ambient scattered light. The latter two can block underwater object segmentation tasks, since they inhibit the emergence of objects of interest and distort image information, while artificial light can contribute to segmentation. Artificial light often focuses on the object of interest, and, therefore, we can initially identify the region of target objects if the collimation of artificial light is recognized. Based on this concept, we propose an optical feature extraction, calculation, and decision method to identify the collimated region of artificial light as a candidate object region. Then, the second phase employs a level set method to segment the objects of interest within the candidate region. This two-phase structure largely removes background noise and highlights the outline of underwater objects. We test the performance of the method with diverse underwater datasets, demonstrating that it outperforms previous methods.

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Underwater Imaging Using a 1 × 16 CMUT Linear Array

Cited by 12 publications

References 26 publications

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

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

The Application of an Ultrasound Tomography Algorithm in a Novel Ring 3D Ultrasound Imaging System

Underwater Object Segmentation Based on Optical Features

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