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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/30442606/natural-shear-wave-imaging-in-the-human-heart-normal-values-feasibility-and-reproducibility
#1
Pedro Santos, Aniela Petrescu, Joao Pedrosa, Marta Orlowska, Vangjush Komini, Jens-Uwe Voigt, Jan D'hooge
Left ventricular myocardial stiffness could offer superior quantification of cardiac systolic and diastolic function when compared to the current diagnostic tools. Shear wave elastography in combination with acoustic radiation force has been widely proposed to non-invasively assess tissue stiffness. Interestingly, shear waves can also result from intrinsic cardiac mechanical events (e.g., closure of valves) without the need for external excitation. However, it remains unknown whether these natural shear waves always occur, how reproducible they can be detected and what the normal range of shear wave propagation speed is...
November 15, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30442605/an-fpga-based-backend-system-for-intravascular-photoacoustic-and-ultrasound-imaging
#2
Xun Wu, Jean L Sanders, Xiao Zhang, F Yalcin Yamaner, Omer Oralkan
The integration of intravascular ultrasound (IVUS) and intravascular photoacoustic (IVPA) imaging produces an imaging modality with high sensitivity and specificity which is particularly needed in interventional cardiology. Conventional side-looking IVUS imaging with a single-element ultrasound (US) transducer lacks forward-viewing capability, which limits the application of this imaging mode in intravascular intervention guidance, Doppler-based flow measurement, and visualization of nearly or totally blocked arteries...
November 14, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30442604/impact-of-high-intensity-ultrasound-on-strength-of-surgical-mesh-when-treating-biofilm-infections
#3
Timothy A Bigelow, Clayton L Thomas, Huaiqing Wu, Kamal Mf Itani
The use of cavitation-based ultrasound histotripsy to treat infections on surgical mesh has shown great potential. However, any impact of the therapy on the mesh must be assessed before the therapy can be applied in the clinic. The goal of this study was to determine if the cavitation-based therapy would reduce the strength of the mesh thus compromising the functionality of the mesh. First, S. aureus biofilms were grown on surgical mesh samples and exposed to high-intensity ultrasound pulses. For each exposure, the effectiveness of the therapy was confirmed by counting the number of colony forming units (CFUs) on the mesh...
November 14, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30403629/three-dimensional-flow-studies-in-cylindrical-magnetohydrodynamic-experiments-using-ultrasound-array-velocimetry
#4
Norman Thieme, Karl Buchner, Lars Buttner, Olf Patzold, Jurgen Czarske
Crystal growth processes can profit from an electromagnetically driven melt flow, since controlling them allows to optimize the mass and heat transfer in the melt and thereby improves the structural and electrical properties of the grown crystals. This process optimization requires a precise understanding of magnetohydrodynamic (MHD) phenomena in crystal growth. Studying time-dependent MHD demands for a high temporal resolution combined with a long measurement duration to analyze transitional flow behavior...
November 5, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30403628/high-order-hadamard-encoded-transmission-for-tissue-background-suppression-in-ultrasound-contrast-imaging-memory-effect-and-decoding-schemes
#5
Che-Chou Shen, Jyun-Hong Yan
Hadamard-encoded multi-pulses (HEM) transmit has recently been utilized for tissue background suppression in ultrasound contrast imaging to enhance contrast-to4 tissue ratio (CTR). Nonetheless, second harmonic component in HEM transmit results in residual tissue background after decoding and thus compromises detection of contrast microbubbles. Theoretically, high-order HEM transmit can produce harmonic-free background but the memory effect which considers the nonlinear contribution of previous bit waveform into next one in the progress of harmonic generation may limit the achievable tissue suppression...
November 2, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30403627/characteristics-of-sh0-wave-converted-to-t-0-1-wave-based-on-a-t-shaped-plate-wrapped-around-a-pipe
#6
Feiran Sun, Zhenguo Sun, Qiang Chen, Riichi Murayama
Ultrasonic guided waves are widely used in industrial NDT for pipes and plates, where pipe-waves and plate-waves exhibit similar behaviors for some specific modes. This paper investigates the characteristics of an SH0 mode plate-wave converted to a T(0, 1) mode pipe-wave based on their similar dispersion and wave structure properties. First, the analytical solution is initially proposed to analyze the characteristics of the SH0-wave propagation in a model of arrayed plates coupled to a pipe. The dispersion curves of the SH-waves are established in a bounded double layer plate in which the effect of the material and the effect of the thickness ratio of the layers are both considered...
November 2, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30403626/2-44-ghz-surface-acoustic-wave-resonator-phase-noise-measured-by-carrier-suppression-technique
#7
E Vaillant, F Sthal, J Imbaud, V Soumann, F-X Esnault, G Cibiel
The phase noise of surface acoustic wave resonators is explored by a passive measurement system based on the carrier suppression technique. The measurements are focused on 2.44 GHz quartz crystal resonators. These resonators are characterized in term of motional parameters. The power dissipated through the resonators is around 500 μW. The second order frequency-temperature coefficient of the resonators has been measured to be around -0.038 ppm/°C2 that corresponds to a classical ST-cut. The resonator conditioning is presented...
November 1, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30371363/hifu-drive-system-miniaturisation-using-harmonic-reduced-pulse-width-modulation
#8
Chris Adams, Thomas M Carpenter, David Cowell, Steven Freear, James R McLaughlan
Switched excitation has the potential to improve on the cost, efficiency and size of the linear amplifier circuitry currently used in HIFU systems. Existing switching schemes are impaired by high harmonic distortion or lack array apodisation capability, so require adjustable supplies and/or large power filters to be useful. A multi-level PWM topology could address both of these issues but the switching-speed limitations of transistors mean that there are a limited number of pulses available in each waveform cycle...
October 29, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30371362/internal-electric-field-in-co-doped-batio3-with-co2-3-nb5-li-and-f-impact-on-functional-properties-and-charge-compensation-with-niobium-and-fluorine-ions
#9
Remy Ul, Franck Levassort, Michael Lematre, Louis-Pascal Tran-Huu-Hue, Mai Pham-Thi
Dense BaTiO3 ceramics (drel > 95%) with a microscale grain size are obtained at 800-1100 °C by a solid-state ceramic process. BaTiO3 (BT) doped with Co2+/3+ leads to a significant improvement in the properties (d33 > 250 pC/N). Soft and hard characteristics of the piezoceramics are observed depending on the dopant ions. The Co/Li acceptor dopants lead to hard piezoceramics and aging phenomena. Aged BT:Co,Li exhibits double loops and a distorted hysteresis cycle for non-poled and poled ceramics, respectively...
October 26, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30371361/fiber-optic-utc-k-timescale-distribution-with-automated-link-delay-cancelation
#10
Przemyslaw Krehlik, Lukasz Sliwczynski, Lukasz Buczek, Jacek Kolodziej
In this paper we describe the idea and practical realization of an automated calibrator of fiber-optic UTC(k) distribution system, along with a high-resolution shifter of 1 PPS signal, which allows to cancel to the propagation delay and thus to produce the 1 PPS at the remote system output with practically zeroed offset. The solution was experimentally verified with ten different optical paths, up to 300 km long. The rms offset of the output timescale in our experiments was 7.1 ps, and maximum absolute value did not exceed 15 ps...
October 26, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30371360/closed-loop-characterization-of-noise-and-stability-in-a-mode-localized-resonant-mems-sensor
#11
Milind Pandit, Chun Zhao, Guillermo Sobreviela, Arif Mustafazade, Sijun Du, Xudong Zou, Ashwin A Seshia
This paper presents results from the closed-loop characterization of an electrically coupled mode-localized sensor topology including measurements of amplitude ratios over long duration, stability, noise floor and the bandwidth of operation. The sensitivity of the prototype sensor is estimated to be -5250 in the linear operation regime. An input-referred stability of 84ppb with respect to normalized stiffness perturbations is achieved at 500s. When compared to frequency shift sensing within the same device, amplitude ratio sensing provides higher resolution for long term measurements due to the intrinsic common mode rejection properties of a mode-localized system...
October 26, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334793/interaction-between-sh0-guided-waves-and-tilted-surface-breaking-cracks-in-plates
#12
Jerome Combaniere, Peter Cawley, Kevin McAughey, Jochen Giese
The interaction between SH0 guided waves and simple defects is well understood and documented, and the SH0 and related torsional guided waves are commonly used in inspection. However, tilted and branching cracks, for which vertical notches are a poor approximation, are found in some environments, particularly when pipes are buried in alkaline soils. This paper studies the interaction between SH0 guided waves and tilted, surface-breaking cracks, investigating the effect of the tilt and depth of the defect. The incident wave interacts with the tilted crack to generate a transmitted wave, a reflected wave and a wave trapped below the crack...
October 18, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334792/high-intensity-focused-ultrasound-hifu-ablation-by-the-dual-frequency-excitation
#13
Siu Kwun Berlinda Law, Yufeng Zhou
High-intensity focused ultrasound (HIFU) has emerged as an effective and noninvasive therapeutic modality for cancer and solid tumor. Despite its promising clinical outcomes and the approval of the Food and Drug Administration of many countries, the ablation time of a large target is long. So enhancement of the lesion production is highly desired. In this study, dual-frequency (or amplitude modulation) excitation was evaluated both numerically and experimentally, and its performance was compared with that using single-frequency excitation at the same power output...
October 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334791/improving-spatial-resolution-using-incoherent-subtraction-of-receive-beams-having-different-apodizations
#14
Anil Agarwal, Jonathan Reeg, Anthony S Podkowa, Michael L Oelze
In ultrasonic imaging, reduction of lateral sidelobes can result in an improved image with less distortion and fewer artifacts. In general, apodization is used to lower sidelobes in exchange for increasing the width of the mainlobe and thus decreasing lateral resolution. Null subtraction imaging (NSI) is a nonlinear image processing technique that uses different receive apodizations on copies of the same RF data to maintain low sidelobe levels while simultaneously improving lateral resolution. The images created with three different apodization functions are combined to form an image with low sidelobe levels and apparent improvements in lateral resolution compared to conventional rectangular apodization...
October 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334790/experimental-quantification-of-noise-in-linear-ultrasonic-imaging
#15
Rhodri L T Bevan, Jie Zhang, Nicolas Budyn, Anthony J Croxford, Paul D Wilcox
An efficient procedure for experimental-based quantification of statistical distributions of both the random and micro-structural speckle noise within an ultrasonic image is presented. This is of particular interest in the multi-view total focusing method, which enables many images (views) of the same region to be obtained by utilising alternative ray paths and mode conversions. For example, in an immersion configuration, 21 separate views of the same region of a sample can be formed by exploiting direct and skip paths...
October 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334756/assessment-of-mechanical-properties-of-tissue-in-breast-cancer-related-lymphedema-using-ultrasound-elastography
#16
Hoda S Hashemi, Stefanie Fallone, Mathieu Boily, Anna Towers, Robert D Kilgour, Hassan Rivaz
Breast cancer-related lymphedema (BCRL) is a consequence of a malfunctioning lymphatic drainage system resulting from surgery or some other form of treatment. In the initial stages, minor and reversible increases in fluid volume of the arm are evident. As the stages progress over time, the underlying pathophysiology dramatically changes with an irreversible increase in arm volume most likely due to a chronic local inflammation leading to adipose tissue hypertrophy and fibrosis. Clinicians have subjective ways to stage the degree and severity such as the pitting test which entails manually comparing the elasticity of the affected and unaffected arms...
October 15, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334755/versatile-ultrasonic-spectrometer-for-liquids-with-practical-sample-handling-by-using-standard-cuvettes
#17
Marcelo M Tiago, Ricardo T Higuti, Luis Elvira, Claudio Kitano, Edvaldo Assuncao, Samuel L Oliveira
This work describes the development and tests of a new ultrasonic spectrometer for liquids based on the use of commercial cuvettes for sample handling. The spectrometer operates in the frequency range from 20 to 80 MHz and gathers some important characteristics, which are its high thermal stability (better than 0.01°C), by the use of Peltier cells, and practical sample handling with small volume (≤3 ml) samples placed inside cuvettes which can be easily removed from the spectrometer, cleaned/sterilized or simply discarded...
October 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30334754/establishing-the-limits-of-validity-of-the-superposition-of-experimental-and-analytical-ultrasonic-responses-for-simulating-imaging-data
#18
Harry A Bloxham, Alexander Velichko, Paul D Wilcox
The superposition of experimental and analytical data is useful for simulating ultrasonic images of defects in samples containing high levels of coherent structural noise. This technique assumes that the superposition of the response of a defect in a homogeneous medium with that of a heterogeneous, defect-free medium is identical to the response of the same defect embedded in the heterogeneous medium. This implies a single-scattering process. Previous experimental work demonstrated successful use of the technique, but only over a limited range of defect Signal to Noise Ratios (SNRs)...
October 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30307860/in-phase-and-quadrature-analysis-for-amplitude-and-frequency-modulation-due-to-vibrations-on-a-surface-acoustic-wave-resonator
#19
A Maskay, D M Hummels, M Pereira da Cunha
Surface acoustic wave resonators (SAWR) have found widespread usage in various modern consumer radiofrequency (RF) communications electronics, such as cellular phones, wireless devices, GPS devices, frequency control, and sensing applications. External mechanical vibrations modify a SAWR relative dimensions and the substrate's elastic properties, which alter the device's acoustic wave propagation velocity, and ultimately causes the SAWR RF response to change. Detecting vibrations is desirable for dynamic strain, or vibration sensing applications...
October 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30296222/cs-fountain-clocks-for-commercial-realisations-an-improved-and-robust-design
#20
Richard J Hendricks, Filip Ozimek, Krzysztof Szymaniec, Bartlomiej Nagorny, Piotr Dunst, Jerzy Nawrocki, Scott Beattie, Bin Jian, Kurt Gibble
We report on the design, assembly, testing and delivery of a series of new caesium fountain primary frequency standards built through commercial and scientific collaboration with international users. The new design, based on proven NPL solutions, improves reliability, simplicity of operation and transportability. The complete system consists of a novel physics package, a specially developed optical package and dedicated electronics for system control. We present results showing that despite their simplified and more compact design, the new fountains have state-of-the-art performance in terms of signal-to-noise ratio and robust long-term operation...
October 8, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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