PMN-PT single-crystal high-frequency kerfless phased array

Chen, Ruimin; Cabrera-Munoz, Nestor E.; Lam, Kwok Ho; Hsu, Hui-Tsung; Fan, Zheng; Zhou, Qifa; Shung, K. Kirk

doi:10.1109/tuffc.2014.2999

Cited by 38 publications

(23 citation statements)

References 38 publications

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“…[1][2][3][4][5][6] However, conventional manufacturing processes such as etching and dicing for piezoelectric ceramics fabrication have limited capability of achieving complex geometry and high resolution(X-Y resolution<25μm). Moreover, mechanical stress caused by the traditional machining processes can result in grain pullout, strength degradation and depolarization of the near surface region, which will led to significant degradation in piezoelectric device performance.…”

Section: Introductionmentioning

confidence: 99%

3D printing of piezoelectric element for energy focusing and ultrasonic sensing

et al. 2016

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Piezoelectric ceramics are currently of considerable interest for their capabilities of converting compressive/tensile stresses to an electric charge, or vice versa. Because ceramics cannot be cast and machined easily, additive manufacturing (AM) processes (3D printing technology) open an effective pathway in geometrical flexibility. However, the piezoelectric properties limit the application of printed ceramics. This work demonstrates that a piezoelectric-composite slurry with BaTiO 3 nanoparticles (100nm) can be 3D printed using Mask-Image-Projection-based Stereolithography (MIP-SL) technology. After a post-process, the density of 5.64g/cm 3 was obtained, which corresponds to 93.7% of the density of bulk BaTiO 3 (6.02 g/cm 3 ). The printed 1 Zeyu Chen and Xuan Song contribute equally to this paper 2 ceramic exhibits a piezoelectric constant and relative permittivity of 160 pCN -1 and 1350respectively. An ultrasonic transducer with printing focused piezoelectric element was fabricated to realize the energy focusing and ultrasonic sensing. A 6.28MHz ultrasonic scan was achieved by the transducer and successfully visualized the structure of a porcine eyeball.

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Section: Introductionmentioning

confidence: 99%

3D printing of piezoelectric element for energy focusing and ultrasonic sensing

et al. 2016

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“…Considerable effort has been put into the development of multielement arrays, which do not need rotation. Miniaturized linear arrays that provide 2-D FL ultrasound images [16]- [18] can achieve volumetric imaging by mechanically scanning the transducer and combining different 2-D planes into a 3-D volume data set. This procedure is complex and easily affected by motion artifacts.…”

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confidence: 99%

A 2-D Ultrasound Transducer With Front-End ASIC and Low Cable Count for 3-D Forward-Looking Intravascular Imaging: Performance and Characterization

Janjic

Tan

Daeichin

et al. 2018

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

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Intravascular ultrasound (IVUS) is an imaging modality used to visualize atherosclerosis from within the inner lumen of human arteries. Complex lesions like chronic total occlusions require forward-looking IVUS (FL-IVUS), instead of the conventional side-looking geometry. Volumetric imaging can be achieved with 2-D array transducers, which present major challenges in reducing cable count and device integration. In this work, we present an 80-element lead zirconium titanate matrix ultrasound transducer for FL-IVUS imaging with a front-end application-specific integrated circuit (ASIC) requiring only four cables. After investigating optimal transducer designs, we fabricated the matrix transducer consisting of 16 transmit (TX) and 64 receive (RX) elements arranged on top of an ASIC having an outer diameter of 1.5 mm and a central hole of 0.5 mm for a guidewire. We modeled the transducer using finite-element analysis and compared the simulation results to the values obtained through acoustic measurements. The TX elements showed uniform behavior with a center frequency of 14 MHz, a -3-dB bandwidth of 44%, and a transmit sensitivity of 0.4 kPa/V at 6 mm. The RX elements showed center frequency and bandwidth similar to the TX elements, with an estimated receive sensitivity of /Pa. We successfully acquired a 3-D FL image of three spherical reflectors in water using delay-and-sum beamforming and the coherence factor method. Full synthetic-aperture acquisition can be achieved with frame rates on the order of 100 Hz. The acoustic characterization and the initial imaging results show the potential of the proposed transducer to achieve 3-D FL-IVUS imaging.

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“…The latter study envisioned a fully populated rectangular grid of CMUT transducers, and the inherent periodicity resulted in strong side-lobes and a high transducer complexity. At higher frequencies, such aperiodic arrays could be manufactured using a kerfless approach, where electrode patterning rather than mechanical separation is used to isolate elements 44, 45 . However, stronger mechanical cross-talk between neighbouring elements is typically observed for kerfless arrays than for conventional arrays 46 , resulting in a reduced image quality.…”

Section: Discussionmentioning

confidence: 99%

A reconfigurable all-optical ultrasound transducer array for 3D endoscopic imaging

Alles

Sheung

Noimark

et al. 2017

Sci Rep

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A miniature all-optical ultrasound imaging system is presented that generates three-dimensional images using a stationary, real acoustic source aperture. Discrete acoustic sources were sequentially addressed by scanning a focussed optical beam across the proximal end of a coherent fibre bundle; high-frequency ultrasound (156% fractional bandwidth centred around 13.5 MHz) was generated photoacoustically in the corresponding regions of an optically absorbing coating deposited at the distal end. Paired with a single fibre-optic ultrasound detector, the imaging probe (3.5 mm outer diameter) achieved high on-axis resolutions of 97 μm, 179 μm and 110 μm in the x, y and z directions, respectively. Furthermore, the optical scan pattern, and thus the acoustic source array geometry, was readily reconfigured. Implementing four different array geometries revealed a strong dependency of the image quality on the source location pattern. Thus, by employing optical technology, a miniature ultrasound probe was fabricated that allows for arbitrary source array geometries, which is suitable for three-dimensional endoscopic and laparoscopic imaging, as was demonstrated on ex vivo porcine cardiac tissue.

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PMN-PT single-crystal high-frequency kerfless phased array

Cited by 38 publications

References 38 publications

3D printing of piezoelectric element for energy focusing and ultrasonic sensing

3D printing of piezoelectric element for energy focusing and ultrasonic sensing

A 2-D Ultrasound Transducer With Front-End ASIC and Low Cable Count for 3-D Forward-Looking Intravascular Imaging: Performance and Characterization

A reconfigurable all-optical ultrasound transducer array for 3D endoscopic imaging

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