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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/30235125/uncertainty-evaluation-of-an-171yb-optical-lattice-clock-at-nmij
#1
Takumi Kobayashi, Daisuke Akamatsu, Yusuke Hisai, Takehiko Tanabe, Hajime Inaba, Tomonari Suzuyama, Feng-Lei Hong, Kazumoto Hosaka, Masami Yasuda
We report an uncertainty evaluation of an 171Yb optical lattice clock with a total fractional uncertainty of 3.6 × 10-16, which is mainly limited by the lattice-induced light shift and the blackbody radiation shift. Our evaluation of the lattice-induced light shift, the density shift, and the secondorder Zeeman shift is based on an interleaved measurement where we measure the frequency shift using the alternating stabilization of a clock laser to the 6s2 1S0 - 6s6p 3P0 clock transition with two different experimental parameters...
September 18, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30235124/experimental-investigation-of-surface-acoustic-wave-acoustoelectric-effect-using-a-graphene-film-on-lithium-niobate
#2
Christopher P Carmichael, M Scott Smith, Arthur R Weeks, Donald C Malocha Malocha
Experimental results of the measured surface acoustic wave (SAW) acoustoelectric effect (AE) using single layer thin film graphene on 128-degree, Y-cut, X-propagating lithium niobate (128-LN) are presented. The use of an AE amplifier in SAW communication devices, especially in GHz bands, could make fundamental advancements in radios, sensors, and other applications. Experimental results at 1350 MHz show the delay line asymmetry of 3dB, given as the ratio of the forward versus reverse peak SAW frequency response, with an applied DC voltage on the graphene film...
September 17, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30222559/autoregressive-signal-processing-applied-to-high-frequency-acoustic-microscopy-of-soft-tissues
#3
Daniel Rohrbach, Jonathan Mamou
Quantitative acoustic microscopy (QAM) at frequencies exceeding 100 MHz has become an established imaging tool to depict acoustical and mechanical properties of soft biological tissues at microscopic resolutions. In this study we investigate a novel autoregressive (AR) model to improve signal processing and parameter estimation and to test its applicability to QAM. The performance of the AR model for estimating acoustical parameters of soft tissues (i.e., acoustic impedance, speed of sound, and attenuation) was compared to the performance of the Hozumi model using simulated ultrasonic QAM-signals and using experimentally measured signals from thin (i...
September 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30222558/low-variance-estimation-of-backscatter-quantitative-ultrasound-parameters-using-dynamic-programming
#4
Zara Vajihi, Ivan M Rosado-Mendez, Timothy J Hall, Hassan Rivaz
One of the main limitations of ultrasound imaging is that image quality and interpretation depend on the skill of the user and the experience of the clinician. Quantitative ultrasound (QUS) methods provide objective, system-independent estimates of tissue properties such as acoustic attenuation and backscattering properties of tissue, which are valuable as objective tools for both diagnosis and intervention. Accurate and precise estimation of these properties requires correct compensation for intervening tissue attenuation...
September 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30222557/a-low-cost-miniature-histotripsy-transducer-for-precision-tissue-ablation
#5
Jeffrey K Woodacre, Thomas G Landry, Jeremy A Brown
A miniature, 10 mm aperture histotripsy transducer with an f-number of 0.7 was fabricated using an elliptically shaped aluminum lens which was epoxy-bonded to an air-backed 5.0 MHz, PTZ-5A, 1-3 dice-and-fill piezoelectric composite, and the lens coupled to water using a quarter-wavelength matching layer of Parylene-C. A KLM model of the device and curved lens was developed. The epoxy layer resulted in an increased power output at 6.8 MHz compared to the 5 MHz composite design. Cavitation was observed in water by driving the composite with a 173 V single-cycle, unipolar 6...
September 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30222556/sensitivity-enhancement-of-mems-diaphragm-hydrophones-using-an-integrated-ring-mosfet-transducer
#6
Peyman Amiri, Zoheir Kordrostami
A high sensitivity MEMS diaphragm hydrophone has been proposed. The designed hydrophone has a higher sensitivity in comparison to its previous counterparts. Readout electronics includes an integrated MOSFET and an external operational amplifier. An integrated ring MOSFET with a piezoelectric gate has been used as the strain to electrical current transducer. The drain of the MOSFET has been connected to an operational amplifier that converts the transistor current to the voltage and also amplifies it. An analytical relation for the sensitivity has been derived which is in an outstanding agreement with the finite element analysis...
September 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30207953/real-time-high-frame-rate-cardiac-b-mode-and-tissue-doppler-imaging-based-on-multiline-transmission-and-multiline-acquisition
#7
Alessandro Ramalli, Alessandro Dallai, Francesco Guidi, Luca Bassi, Enrico Boni, Ling Tong, Giuseppe Fradella, Jan Drhooge, Piero Tortoli
Cardiovascular diseases, the leading cause of death in the world, are often associated with the dysfunction of the left ventricle. Even if, in clinical practice, the myocardial function is often assessed through visual wall motion scoring on B-mode images, quantitative techniques have been introduced, e.g. ultrasound tissue Doppler imaging (TDI). However, this technique suffers from the limited frame rate of currently available imaging techniques that needs to be balanced with the field of view. High frame rate (HFR) cardiac imaging has been recently tested off-line by simultaneously transmitting multiple focused beams into different directions and acquiring raw channel data into a PC...
September 10, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30207952/ultimate-limits-of-differential-resonant-mems-sensors-based-on-two-coupled-linear-resonators
#8
J Juillard, P Prache, P Maris Ferreira, N Barniol
In this paper, we investigate how additive noise, e.g. thermomechanical noise, impacts the resolution of mode-localized resonant sensing architectures based on two passively-coupled linear resonators. Existing work suggests that the ultimate resolution of these sensors can be improved by decreasing the coupling coefficient of the resonators. The present work gives an analytical proof that this result does not hold, and that the resolution of such sensors is actually independent of the coupling strength. These results are established for different output metrics and operating points, in closed-loop and in open-loop, and compared to those obtained with other approaches based on actively-coupled resonators...
September 10, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30188819/multi-transducer-saw-device-architecture-for-passive-wireless-sensor-tags
#9
Boris V Sveshnikov, Alexey P Shitvov
A new architecture of surface acoustic wave (SAW) sensor-tags with lower insertion loss and enhanced sensitivity is investigated. It efficiently employs two transducer arrays at the input and output of the acoustic channel, respectively. The improved sensitivity is attained due to a higher number of stronger constituent signals contributing constructively to the device response. An efficient matrix modeling approach is generalized to permit fast design and synthesis of the multitransducer sensor-tags with arbitrary topologies...
September 5, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30183625/multi-dimensional-clutter-filter-optimization-for-ultrasonic-perfusion-imaging
#10
Min Woo Kim, Yang Zhu, Jamila Hedhli, Lawrence W Dobrucki, Michael F Insana
Combinations of novel pulse-echo acquisitions and clutter filtering techniques can improve the sensitivity and specificity of power Doppler images, thus reducing the need for exogenous contrast enhancement. We acquire echoes following bursts of Doppler pulse transmissions sparsely applied in regular patterns over long durations. The goal is to increase the sensitivity of the acquisition to slow disorganized patterns of motion from peripheral blood perfusion. To counter a concomitant increase in clutter signal power, we arrange the temporal echo acquisitions into two data-array axes, combine them with a spatial axis for the tissue region of interest, and apply 3-D singular-value decomposition (SVD) clutter filtering...
September 3, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30183624/development-of-a-knn-ceramic-based-lead-free-linear-array-ultrasonic-transducer
#11
Zhiqiang Zhang, Ruimin Chen, Bo Wang, Tianfu Zhang, Min Su, Rong Liu, Jiaxing Yang, Xiaodong Cao, Yongxiang Li, Hairong Zheng, K Kirk Shung, Mark S Humayun, Qifa Zhou, Weibao Qiu
High-frequency array transducers can provide higher imaging resolution than traditional transducers, thus resolving smaller features and producing finer images. Commercially available ultrasonic transducers are mostly made with lead-based piezoelectric materials, which are harmful to the environment and public health. This paper presents the development of a 64-elements high-frequency (18.3 MHz) lead-free linear array ultrasonic transducer based on (K0.44Na0.52Li0.04)(Nb0.86Ta0.1Sb0.04)O3 (KNLNTS) piezoceramic...
September 3, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30176587/acoustic-methods-for-increasing-the-cavitation-initiation-pressure-threshold
#12
Hedieh Alavi Tamaddoni, Alexander P Duryea, Eli Vlaisavljevich, Zhen Xu, Timothy L Hall
Histotripsy is a tissue ablation method that utilizes focused high amplitude ultrasound to generate a cavitation bubble cloud that mechanically fractionates tissue. Effective histotripsy depends on initiation, control, and maintenance of cavitation bubble clouds in the targeted area. In this study, we hypothesized that a low pressure acoustic pulse sequence applied before and/or during histotripsy therapy would increase the cavitation initiation pressure threshold and growth of cavitation bubble clouds. This technique could shrink or "sharpen" the focal zone during histotripsy to produce more precise and well defined lesions with minimal collateral damage...
August 29, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30176586/full-and-half-wavelength-ultrasonic-percussive-drills
#13
Xuan Li, Margaret Lucas, Patrick Harkness
Ultrasonic-percussive drills are a leading technology for small rock drilling applications where power and weight-on-bit are at a premium. The concept uses ultrasonic vibrations to excite an oscillatory motion in a free-mass, which then delivers impulsive blows to a drilling-bit. This is a relatively complex dynamic problem involving the transducer, the free-mass, the drilling-bit and, to a certain extent, the rock surface itself. This paper examines the performance of a full-wavelength transducer compared to a half-wavelength system, which may be more attractive due to mass and dimensional drivers...
August 28, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30176585/incident-angle-identification-based-on-first-echo-energy-attenuation-in-ultrasonic-thickness-measurement
#14
Yongqing Wang, Meng Lian, Haibo Liu, Yangwei Ying, Lianjie Zhou
Ultrasonic pulse technology has been widely employed for thickness measurement in industrial field. Generally, the ultrasonic transducer is required to be perpendicular to the test sample surface when using longitudinal wave. However, the transducer posture deviation (i.e. incident angle) of ultrasonic beam relative to the local surface normal is always inevitable. In addition, the received ultrasonic pressure will be weakened significantly because of the variation of echo propagation path and the attenuation of echo amplitude...
August 28, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30136938/adaptive-multifocus-beamforming-for-contrast-enhanced-super-resolution-ultrasound-imaging-in-deep-tissue
#15
David Espindola, Fanglue Lin, Danai E Soulioti, Paul A Dayton, Gianmarco Pinton
Contrast-enhanced-super-resolution ultrasound imaging, also referred to as ultrasound localization microscopy, can resolve vessels that are smaller than the diffraction limit and has recently been able to generate super resolved vascular images of shallow in vivo structures in small animals. To fully translate this technology to the clinic, it is advantageous to be able to detect microbubbles at deeper locations in tissue while maintaining a short acquisition time. Current implementations of this imaging method rely on plane wave imaging...
August 21, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30130184/broadband-ultrasonic-attenuation-estimation-and-compensation-with-passive-acoustic-mapping
#16
Michael D Gray, Constantin C Coussios
Several active and passive techniques have been developed to detect, localize and quantify cavitation activity during therapeutic ultrasound procedures. Much of the prior cavitation monitoring research has been conducted using lossless in vitro systems or small animal models in which path attenuation effects were minimal. However, the performance of these techniques may be substantially degraded by attenuation between the internal therapeutic target and the external monitoring system. As a further step towards clinical application of passive acoustic mapping (PAM), this paper presents methods for attenuation estimation and compensation based on broadband cavitation data measured with a linear ultrasound array...
August 20, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30130183/analysis-and-design-of-capacitive-parametric-ultrasonic-transducers-for-efficient-ultrasonic-power-transfer-based-on-a-1d-lumped-model
#17
Sushruta Surappa, Molei Tao, F Levent Degertekin
There is an increasing interest in wireless power transfer for medical implants, sensors networks and consumer electronics. A passive capacitive parametric ultrasonic transducer (CPUT) can be suitable for these application as it does not require a DC bias or permanent charge. In this paper, we present a 1-dimensional lumped parameter model of the CPUT to study its operation and investigate relevant design parameters for power transfer applications. The CPUT is modeled as an ultrasound driven piston coupled to an RLC resonator resulting in a system of two coupled nonlinear ordinary differential equations...
August 17, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30113894/characterization-of-elastic-modulus-across-the-al1-xscx-n-system-using-dft-and-substrate-effect-corrected-nanoindentation
#18
Dong Wu, Yachao Chen, Sukriti Manna, Kevin Talley, Andriy Zakutayev, Geoff Brennecka, Cristian V Ciobanu, Paul Constantine, Corinne E Packard, Corinne E Packard
Knowledge of accurate values of elastic modulus of (Al1-xScx)N is required for design of piezoelectric resonators and related devices. Thin films of (Al1-xScx)N across the entire composition space are deposited and characterized. Accuracy of modulus measurements is improved and quantified by removing the influence of substrate effects and by direct comparison of experimental results with density functional theory (DFT) calculations. The 5-30% Sc compositional range is of particular interest for piezoelectric applications and is covered at higher compositional resolution here than in previous work...
August 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30113895/high-spatial-temporal-resolution-reconstruction-of-plane-wave-ultrasound-images-with-a-multichannel-multiscale-convolutional-neural-network
#19
Zixia Zhou, Yuanyuan Wang, Jinhua Yu, Yi Guo, Wei Guoand, Yanxing Qi
In recent years, plane-wave imaging (PWI) has attracted considerable attention because of its high temporal resolution. However, the low spatial resolution of PWI limits its clinical applications, which has inspired various studies on the high spatial resolution reconstruction of plane-wave (PW) ultrasound images. Although compounding methods and traditional high spatial resolution reconstruction approaches can improve the image quality, these techniques decrease the temporal resolution. Since learning methods can fully reserve the high temporal resolution of PW ultrasounds, a novel convolutional neural network (CNN) model for the high spatial-temporal resolution reconstruction of PW ultrasound images is proposed in this paper...
August 14, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30113893/lamplight-stabilization-for-gps-rb-atomic-clocks-via-rf-power-control
#20
M Huang, A Stapleton, J Camparo
Recent evidence indicates that the signal-in-space user-range-error (SIS-URE) for GPS is strongly influenced by the satellite atomic clock's Rb lamplight intensity jumps. Following a proposal by Bloom and Bell, we have implemented rf-power control of an rf-discharge lamp of the type employed in Rb atomic frequency standards (RAFS). Since Rb lamplight intensity jumps are mapped onto the clock's output frequency via the light-shift effect, stabilization of the Rb light emitted by the lamp has the potential to significantly improve the RAFS' long-term frequency-stability, and hence the GPS SIS-URE...
August 14, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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