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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/28816660/erratum-a-200-1380-khz-quadrifrequency-focused-ultrasound-transducer-for-neurostimulation-in-rodents-and-primates-transcranial-in-vitro-calibration-and-numerical-study-of-the-influence-of-skull-cavity
#1
Charlotte Constans, Thomas Deffieux, Pierre Pouget, Mickael Tanter, Jean-Francois Aubry
Presents correction in the paper "A 200 - 1380 kHz Quadrifrequency Focused Ultrasound Transducer For Neurostimulation In Rodents And Primates: Transcranial In Vitro Calibration And Numerical Study Of The Influence Of Skull Cavity", IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2017, vol. 64, no 4, p. 717-724.
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28816659/low-frequency-and-broadband-vibration-energy-harvesting-using-base-mounted-piezoelectric-transducers
#2
Robert Koven, Matthew Mills, Richard Gale, Burak Aksak
Piezoelectric vibration energy harvesters often consist of a cantilevered beam composed of a support layer and one or two piezoelectric layers with a tip mass. While this configuration is advantageous for maximizing electromechanical coupling, the mechanical properties of the piezoelectric material can place limitations on harvester size and resonant frequency. Here, we present numerical and experimental results from a new type of piezoelectric energy harvester in which the mechanical properties and the resonant frequency of the cantilever beam resonator are effectively decoupled from the piezoelectric component...
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809682/an-optimization-and-comparative-study-of-air-coupled-cmut-cells-with-circular-and-annular-geometries
#3
Shuai Na, Zhenhao Li, Lawrence L P Wong, Albert I-H Chen, Mirek Macecek, John T W Yeow
Air-coupled capacitive micromachined ultrasonic transducers (CMUTs) with annular cell geometry have recently been reported to have a promising transmit sensitivity. This paper reports three optimization schemes, which further improve the transmit sensitivity and also help achieve a reasonable comparison between the novel annular and conventional circular cells. Lumped element models of both cell types with laminate plate structures are presented. Based on these models, a design optimization flow chart was constructed to facilitate analytical optimization on the three schemes...
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809681/a-prototype-therapy-system-for-transcutaneous-application-of-boiling-histotripsy
#4
Adam D Maxwell, Petr V Yuldashev, Wayne Kreider, Tatiana D Khokhlova, George R Schade, Timothy L Hall, Oleg A Sapozhnikov, Michael R Bailey, Vera A Khokhlova
Boiling histotripsy is a method of focused ultrasound surgery that noninvasively applies millisecond-length pulses with high-amplitude shock fronts to generate liquefied lesions in tissue. Such a technique requires unique outputs compared to a focused ultrasound thermal therapy apparatus, particularly to achieve high in situ pressure levels through intervening tissue. This article describes the design and characterization of a system capable of producing the necessary pressure to transcutaneously administer boiling histotripsy therapy through clinically relevant overlying tissue paths using pulses with duration up to 10 ms...
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809680/high-performance-saw-resonator-on-new-multi-layered-substrate-using-litao3-crystal
#5
Tsutomu Takai, Hideki Iwamoto, Yuichi Takamine, Hisashi Yamazaki, Toshiyuki Fuyutsume, Haruki Kyoya, Takeshi Nakao, Hajime Kando, Masahiro Hiramoto, Takanori Toi, Masayoshi Koshino, Norio Nakajima
To develop the high performance filters and duplexers required for recent LTE frequency bands in mobile handsets, a surface acoustic wave (SAW) resonator is needed that have higher quality (Q) and a lower temperature coefficient of frequency (TCF). To achieve this, the authors focused on acoustic energy confinement in the depth direction for a rotated Y-X LiTaO3 (LT) substrate. Characteristics of multi-layered substrates with low impedance and high impedance layers under LT layer were studied numerically in terms of acoustic energy distribution, phase velocity, coupling coefficient and temperature characteristics employing a finite element method (FEM) simulation...
August 10, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796617/segmentation-of-3d-high-frequency-ultrasound-images-of-human-lymph-nodes-using-graph-cut-with-energy-functional-adapted-to-local-intensity-distribution
#6
Jen-Wei Kuo, Jonathan Mamou, Yao Wang, Emi Saegusa-Beecroft, Junji Machi, Ernest J Feleppa
Previous studies by our group have shown that three-dimensional high-frequency quantitative ultrasound methods have the potential to differentiate metastatic lymph nodes from cancer-free lymph nodes dissected from human cancer patients. To successfully perform these methods inside the lymph node parenchyma, an automatic segmentation method is highly desired to exclude the surrounding thin layer of fat from quantitative ultrasound processing and accurately correct for ultrasound attenuation. In high-frequency ultrasound images of lymph nodes, the intensity distribution of lymph node parenchyma and fat varies spatially because of acoustic attenuation and focusing effects...
August 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796616/wireless-power-transfer-to-millimeter-sized-nodes-using-airborne-ultrasound
#7
Angad S Rekhi, Butrus T Khuri-Yakub, Amin Arbabian
We propose the use of airborne ultrasound for wireless power transfer to mm-sized nodes, with intended application in the next generation of the Internet of Things. We show through simulation that ultrasonic power transfer can deliver 50μW to a mm-sized node 0.88m away from a ~50 kHz, 25 cm2 transmitter array, with the peak pressure remaining below recommended limits in air, and with load power increasing with transmitter area. We report wireless power recovery measurements with a pre-charged capacitive micromachined ultrasonic transducer, demonstrating a load power of 5μW at a simulated distance of 1...
August 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796615/effects-of-signal-saturation-on-qus-parameter-estimates-based-on-high-frequency-ultrasound-signals-acquired-from-isolated-cancerous-lymph-nodes
#8
Kazuki Tamura, Jonathan Mamou, Alain Coron, Kenji Yoshida, Ernest J Feleppa, Tadashi Yamaguchi
Choosing an appropriate dynamic range for acquiring radio-frequency (RF) data from a high-frequency ultrasound (HFU) system is challenging because signals can vary greatly in amplitude as a result of focusing and attenuation effects. In addition, quantitative ultrasound (QUS) results are altered by saturated data. In this study, the effects of saturation on QUS estimates of effective scatterer diameter (ESD) and effective acoustic concentration (EAC) were quantified using simulated and experimental RF data...
August 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792894/high-quality-plane-wave-compounding-using-convolutional-neural-networks
#9
Maxime Gasse, Fabien Millioz, Emmanuel Roux, Damien Garcia, Herve Liebgott, Denis Friboulet
Single plane wave (PW) imaging produces ultrasound (US) images of poor quality at high frame rates (ultrafast). High-quality PW imaging usually relies on the coherent compounding of several successive steered emissions (typically more than ten), which in turn results in a decreased frame rate. We propose a new strategy to reduce the number of emitted PWs by learning a compounding operation from data, i.e. by training a convolutional neural network (CNN) to reconstruct high quality images using a small number of transmissions...
August 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792893/large-stroke-high-fidelity-pzn-pt-single-crystal-stake-actuator
#10
Yu Huang, Yue Xue Xia, Dian Hua Lin, Kui Yao, Leong Chew Lim
A new piezoelectric actuator design, called "Stake" actuator, is proposed and demonstrated in this work. As an example, the stake actuator is made of four d32-mode PZN-5.5%PT single crystals, each of 25mmL × 8mmW × 0.4mmT in dimensions, bonded with the aid of polycarbonate (PC) edge guide-cum-stiffeners into a square-pipe configuration for improved bending and twisting strengths and capped with top and bottom pedestals made of 1.5 mm thick anodized aluminium. The resultant stake actuator measured 9 mm × 9 mm × 28 mm...
August 3, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792892/eemd-domain-ar-spectral-method-for-mean-scatterer-spacing-estimation-of-breast-tumors-from-ultrasound-backscattered-rf-data
#11
Navid Ibtehaj Nizam, S Kaisar Alam, Md Kamrul Hasan
We present a novel method for estimating the mean scatterer spacing (MSS) of breast tumours using ensemble empirical mode decomposition (EEMD) domain analysis of deconvolved backscattered radio-frequency (RF) data. The autoregressive (AR) spectrum from which the MSS is estimated is obtained from the intrinsic mode functions (IMFs) due to regular scatterers embedded in RF data corrupted by the diffuse scatterers. The IMFs are chosen by giving priority to the presence of an enhanced fundamental harmonic and the presence of a greater number of higher harmonics in the AR spectrum estimated from the IMFs...
August 3, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792891/feasibility-and-validation-of-4-d-pulse-wave-imaging-in-phantoms-and-in-vivo
#12
Iason Z Apostolakis, Pierre Nauleau, Clement Papadacci, Matthew D McGarry, Elisa E Konofagou
Pulse wave Imaging (PWI) is a noninvasive technique for tracking the propagation of the pulse wave along the arterial wall. 3-D ultrasound imaging would aid in objectively estimating the PulseWave Velocity (PWV) vector. This study aims to introduce a novel PWV estimation method along the propagation direction, validate it in phantoms and test its feasibility in vivo. A silicone vessel phantom consisting of a stiff and a soft segment along the longitudinal axis and and a silicone vessel with a plaque were constructed...
August 3, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28783630/rayleigh-saw-assisted-sh-saw-immunosensor-on-x-cut-148-y-litao3
#13
Takashi Kogai, Hiromi Yatsuda, Jun Kondoh
In this paper, we describe a shear horizontal surface acoustic wave (SH-SAW) immunosensor that utilizes induce agitation by a Rayleigh surface acoustic wave (R-SAW) on an X-cut 148-Y LiTaO3 substrate. On this substrate, SH-SAWs and R-SAWs with different frequencies can be effectively generated at an interdigital transducer (IDT). First, to consider the power flow angles of SH-SAWs and R-SAWs on this substrate, 360 MHz delay lines with six different tilt angles were designed and fabricated. From the experiments, an optimal power flow angle of 9° for the SH-SAW on this substrate is obtained...
July 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28767367/3-d-in-vitro-acoustic-super-resolution-and-super-resolved-velocity-mapping-using-microbubbles
#14
Kirsten Christensen-Jeffries, Jemma Brown, Paul Aljabar, Mengxing Tang, Christopher Dunsby, Robert J Eckersley
Standard clinical ultrasound (US) imaging frequencies are unable to resolve microvascular structures due to the fundamental diffraction limit of US waves. Recent demonstrations of 2D super-resolution both in vitro and in vivo have demonstrated that fine vascular structures can be visualized using acoustic single bubble localization. Visualization of more complex and disordered 3D vasculature, such as that of a tumor, requires an acquisition strategy which can additionally localize bubbles in the elevational plane with high precision in order to generate super-resolution in all three dimensions...
July 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28749348/fast-simulation-of-dynamic-ultrasound-images-using-the-gpu
#15
Sigurd Storve, Hans Torp
Simulated ultrasound data is a valuable tool for development and validation of quantitative image analysis methods in echocardiography. Unfortunately, simulation time can become prohibitive for phantoms consisting of a large number of point-scatterers. The COLE algorithm by Gao et al. is a fast convolution-based simulator that trades simulation accuracy for improved speed. We present highly efficient parallelized CPU- and GPU-implementations of the COLE algorithm with an emphasis on dynamic simulations involving moving pointscatterers...
July 25, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28749347/approximate-message-passing-reconstruction-of-quantitative-acoustic-microscopy-images
#16
J-H Kim, J Mamou, P R Hill, N Canagarajah, D Kouame, A Basarab, A Achim
A novel framework for compressive sensing (CS) data acquisition and reconstruction in quantitative acoustic microscopy (QAM) is presented. Three different compressive sensing patterns, adapted to the specifics of QAM systems, were investigated as an alternative to the current raster-scanning approach. They consist of diagonal sampling, a row random and a spiral scanning pattern and they can all significantly reduce both the acquisition time and the amount of sampled data. For subsequent image reconstruction, we design and implement an innovative technique, whereby a recently proposed approximate message passing (AMP) method is adapted to account for the underlying data statistics...
July 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28742033/the-impact-of-model-based-clutter-suppression-on-cluttered-aberrated-wavefronts
#17
Kazuyuki Dei, Brett Byram
Recent studies reveal that both phase aberration and reverberation play a major role in degrading ultrasound image quality. We previously developed an algorithm for suppressing clutter, but we have not yet tested it in the context of aberrated wavefronts. In this study, we evaluate our previously reported algorithm, called aperture domain model image reconstruction (ADMIRE), in the presence of phase aberration and in the presence of multipath scattering and phase aberration. We use simulations to investigate phase aberration corruption and correction in the presence of reverberation...
July 20, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28742032/architecture-of-an-ultrasound-system-for-continuous-real-time-high-frame-rate-imaging
#18
Enrico Boni, Luca Bassi, Alessandro Dallai, Valentino Meacci, Alessandro Ramalli, Monica Scaringella, Francesco Guidi, Stefano Ricci, Piero Tortoli
High frame rate (HFR) imaging methods based on the transmission of defocused or plane waves rather than focused beams are increasingly popular. However, the production of HFR images poses severe requirements both in the transmission and the reception sections of ultrasound scanners. In particular, major technical difficulties arise if the images must be continuously produced in real-time, i.e. without any acquisition interruption nor loss of data. This paper presents the implementation of the real-time HFR compounded imaging application in the ULA-OP 256 research platform...
July 20, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28715329/phased-array-imaging-of-complex-geometry-composite-components
#19
Alex J Brath, Francesco Simonetti, Francesco Simonetti
Progress in computational fluid dynamics (CFD) and the availability of new composite materials are driving major advances in the design of aerospace engine components which now have highly complex geometries optimized to maximize system performance. However, shape complexity poses significant challenges to traditional non-destructive evaluation (NDE) methods whose sensitivity and selectivity rapidly decrease as surface curvature increases. Additionally, new aerospace materials typically exhibit an intricate microstructure that further complicates the inspection...
July 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28708553/dispersion-differences-and-consistency-of-artificial-periodic-structures
#20
Z B Cheng, W K Lin, Z F Shi
Dispersion differences and consistency of artificial periodic structures, including phononic crystals, elastic metamaterials as well as periodic structures composited of phononic crystals and elastic metamaterials, are investigated in this paper. By developing a K(ω) method, complex dispersion relations and group/phase velocity curves of both the single mechanism periodic structures and the mixing mechanism periodic structures are calculated at first, from which dispersion differences of artificial periodic structures are discussed...
July 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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