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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/28541897/capacitive-micro-machined-ultrasound-transducers-for-interstitial-high-intensity-ultrasound-therapies
#1
W Apoutou N'Djin, Bjoern Gerold, Jeremy Vion, Michael Canney, An Nguyen-Dinh, Alexandre Carpentier, Jean-Yves Chapelon
Capacitive Micro-machined Ultrasound Transducers (CMUTs) exhibit several potential advantages over conventional piezo technologies for use in therapeutic ultrasound devices, including: ease of miniaturization and integration with electronics, broad bandwidth (>several MHz), and compatibility with magnetic resonance imaging (MRI). In this work, the electro-acoustic performance of CMUTs designed for interstitial high intensity contact ultrasound (HICU) applications was evaluated and the feasibility of generating ultrasound-induced heating and thermal destruction of biological tissues was studied...
May 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28541199/3d-nonlinear-acoustic-inverse-scattering-algorithm-and-quantitative-results
#2
James Wiskin, David Borup, Elaine Iuanow, John Klock, Mark Lenox
We describe a novel 3D ultrasound technology, the Quantitative Transmission Ultrasound (QT Ultrasound®) system and algorithm to image a pendent breast in a water bath. Quantitative accuracy is verified using phantoms. Morphological accuracy is verified using cadaveric breast and in vivo images, and spatial resolution is estimated. This paper generalizes an earlier 2D algorithm to a full 3D inversion algorithm and shows the importance of such a 3D algorithm for artifact suppression as compared with the 2D algorithm...
May 23, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28534769/a-systematic-investigation-of-lateral-estimation-using-various-interpolation-approaches-in-conventional-ultrasound-imaging
#3
Zhi Liu, Chengwu Huang, Jianwen Luo
Accurate lateral displacement and strain estimat- ion is critical for some applications of elasticity imaging. Typically, motion estimation in the lateral direction is challenging because of low sampling frequency and lack of phase information in conventional ultrasound imaging. Several approaches have been proposed to improve the performance of lateral estimation, such as lateral interpolation on the RF signals (Interp_RF), lateral interpolation on the cross-correlation function (Interp_CCF) and lateral interpolation on both the RF signals and cross-correlation function (Interp_Both)...
May 17, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28504937/ultrasonic-fingerprint-sensor-with-transmit-beamforming-based-on-a-pmut-array-bonded-to-cmos-circuitry
#4
Xiaoyue Jiang, Hao-Yen Tang, Yipeng Lu, Eldwin Ng, Julius Tsai, Bernhard Boser, David Horsley
In this paper, we present a single-chip 65x42 element ultrasonic pulse-echo fingerprint sensor with transmit beamforming based on piezoelectric micromachined ultrasonic transducers (PMUTs) directly bonded to a CMOS readout ASIC. The readout ASIC was realized in a standard 180 nm CMOS process with a 24V high voltage transistor option. Pulse-echo measurements are performed column-by-column in sequence using either one column or five columns to transmit the ultrasonic pulse at 20 MHz. Transmit beamforming is used to focus the ultrasonic beam at the imaging plane where the finger is located, increasing the ultrasonic pressure and narrowing the 3dB beam-width to 50 microns, a factor of 6...
May 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28504936/wave-mode-discrimination-of-coded-ultrasonic-guided-waves-using-two-dimensional-compressed-pulse-analysis
#5
Sergio Malo, Sina Fateri, Makis Livadas, Cristinel Mares, Tat-Hean Gan
Ultrasonic guided waves testing is a technique successfully used in many industrial scenarios worldwide. For many complex applications, the dispersive nature and multimode behavior of the technique still poses a challenge for correct defect detection capabilities. In order to improve the performance of the guided waves a 2-D compressed pulse analysis is presented in this paper. This novel technique combines the use of pulse compression and dispersion compensation in order to improve the signal-tonoise ratio and temporal-spatial resolution of the signals...
May 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28499996/modeling-and-analysis-of-lateral-propagation-of-surface-acoustic-waves-including-coupling-between-different-waves
#6
Benfeng Zhang, Tao Han, Gongbin Tang, Qiaozhen Zhang, Tatsuya Omori, Ken-Ya Hashimoto
This paper discusses lateral propagation of surface acoustic waves (SAWs) in periodic grating structures when two types of SAWs exist simultaneously and are coupled. The thin plate model proposed by the authors is extended to include the coupling between two different SAW modes. First, lateral SAW propagation in an infinitely long periodic grating is modeled and discussed. Then the model is applied to the Al grating/42°YXLiTaO3 (42-LT) substrate structure, and it is shown that the slowness curve shape changes from concave to convex with the Al grating thickness...
May 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28499995/large-scale-nonlinear-lumped-and-integrated-field-simulations-of-top-orthogonal-to-bottom-electrode-cmut-architectures
#7
Christopher Ceroici, Roger J Zemp
Capacitive micromachined ultrasonic transducers (CMUTs) promise many advantages over traditional piezoelectric transducers such as the potential to construct large, cost-effective 2D arrays. To avoid wiring congestion issues associated fully wired arrays, Top-Orthogonal-to-Bottom Electrode (TOBE) CMUT array architectures have proven to be a more practical alternative, using only 2N wires for an NxN array. Optimally designing a TOBE CMUT array is a significant challenge due to the range of parameters from the device level up to the operating conditions of the entire array...
May 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28499994/observation-of-nonlinear-harmonic-generation-of-bulk-modes-in-saw-devices
#8
Marc Solal, Kimmo Kokkonen, Shogo Inoue, Jean-Bernard Briot, Ben Abbott, Kevin Gamble
Nonlinear generation of harmonics is measured on the wafer level on temperature compensated surface acoustic wave (TC-SAW) resonators on lithium niobate. The second harmonic response features strong peaks looking like multiple resonant modes. The product of the frequency difference between the successive peaks to the substrate thickness is found to remain almost constant. The results also show that the level of the harmonic signal strongly depends on the roughness of the back side of the substrate. Due to these findings, it was assumed that the signal is due to nonlinear generation of a bulk mode...
May 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28489536/dual-frequency-piezoelectric-endoscopic-transducer-for-imaging-vascular-invasion-in-pancreatic-cancer
#9
Brooks D Lindsey, Jinwook Kim, Paul A Dayton, Xiaoning Jiang
Cancers of the pancreas have the poorest prognosis among all cancers, as many tumors are not detected until surgery is no longer a viable option. Surgical viability is typically determined via endoscopic ultrasound imaging. However, many patients who may be eligible for resection are not offered surgery due to diagnostic challenges in determining vascular or lymphatic invasion. In this article, we describe the development of a dual-frequency piezoelectric transducer for rotational endoscopic imaging designed to transmit at 4 MHz and receive at 20 MHz in order to image microbubble-specific superharmonic signals...
May 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28489535/lead-free-multilayer-piezoceramic-composites-the-effect-of-co-sintering-on-electromechanical-properties
#10
Azatuhi Ayrikyan, Andreas Kastner, Neamul Khansur, Shintaro Yasui, Mitsuru Itoh, Kyle Webber
The macroscopic electromechanical behavior of lead-free multilayer composites was characterized from room temperature to 150 °C. The polar seed component consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced long range ferroelectric order, whereas the nonpolar matrix was an ergodic relaxor Bi0.5(Na0.75K0.25)0.5TiO3-6BiAlO3) that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of the effects of co-sinering are demonstrated through examination of grain size, interdiffusion and pore structure...
May 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28463191/quantifying-backscatter-anisotropy-using-the-reference-phantom-method
#11
Quinton W Guerrero, Ivan Rosado-Mendez, Lindsey C Drehfal, Helen Feltovich, Timothy J Hall
Acoustic properties can be exploited to infer and evaluate tissue microstructure. However, common assumptions are that the medium of interest is homogeneous and isotropic, and that its underlying physical properties cause diffuse scattering. In this paper, we describe how we developed and tested novel parameters designed to address isotropy/anisotropy in backscattered echo signal power in complex biological tissues. Specifically, we explored isotropy/anisotropy in backscattered power in isotropic phantoms (spherical glass beads), an anisotropic phantom (dialysis phantom with rod-like fibers), and an in vivo human tissue with well-described anisotropy (bicep muscle)...
April 27, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28436860/effect-on-high-intensity-fields-of-a-tough-hydrophone-with-hydrothermal-pzt-thick-film-vibrator-and-titanium-front-layer
#12
Nagaya Okada, Shinichi Takeuchi
A novel tough hydrophone was fabricated by depositing hydrothermally synthesized lead zirconate titanate polycrystalline film on the back-side surface of a titanium plate. Our developed tough hydrophone resisted damage in a high-pressure field (15 MPa) at a focal point of a sinusoidal continuous wave driven by a concave high-intensity focused ultrasound (HIFU) transducer with up to 50 W of power input to the sound source. The hydrophone was suitable for the HIFU field, even though the hydrophone has a flat-shape tip of 3...
April 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28436859/in-vivo-intracardiac-vector-velocity-imaging-using-phased-array-transducers-for-pediatric-cardiology
#13
Solveig Fadnes, Morten Wigen, Siri Ann Nyrnes, Lasse Lovstakken
Two-dimensional blood speckle tracking has shown promise for measuring complex flow patterns in neonatal hearts using linear arrays and high-frame-rate plane wave imaging. For general pediatric applications, however, the need for phased array probes emerges due to the limited intercostal acoustic window available. In this work, a clinically approved real-time duplex imaging setup with phased array probes was used to investigate the potential of blood speckle tracking for 2-D vector velocity imaging of children with congenital heart disease...
April 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422658/equivalent-magnetic-noise-in-magnetoelectric-laminates-comprising-bidomain-linbo-sub-3-sub-crystals
#14
Joao Vidal, Andrey V Turutin, Ilya V Kubasov, Mikhail D Malinkovich, Yurii N Parkhomenko, Svetlana P Kobeleva, Andrei L Kholkin, Nikolai A Sobolev
The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with opposite spontaneous polarization vectors. Impedance, ME effect and equivalent magnetic noise density measurements have been performed under quasi-static and resonant conditions...
April 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422657/phased-array-ultrasound-system-for-planar-flow-mapping-in-liquid-metals
#15
Kevin Mader, Richard Nauber, Vladimir Galindo, Hannes Beyer, Lars Buttner, Sven Eckert, Jurgen Czarske
Controllable magnetic fields can be used to optimize flows in technical and industrial processes involving liquid metals in order to improve quality and yield. However, experimental studies in magnetohydrodynamics (MHD) often involve complex, turbulent flows and require planar, two-component velocity measurements through only one acoustical access. We present the phased array ultrasound Doppler velocimeter (PAUDV) as a modular research platform for flow mapping in liquid metals. It combines the pulse wave Doppler method with the phased array technique to adaptively focus the ultrasound beam...
April 12, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422656/fast-plane-wave-2-d-vector-flow-imaging-using-transverse-oscillation-and-directional-beamforming
#16
Jonas Jensen, Carlos A Villagomez-Hoyos, Matthias B Stuart, Caroline Ewertsen, Michael R Nielsen, Jorgen Jensen
Several techniques can estimate the 2-D velocity vector in ultrasound. Directional beamforming (DB) estimates blood flow velocities with a higher precision and accuracy than transverse oscillation (TO), but at the cost of a high beamforming load when estimating the flow angle. In this paper, it is proposed to use TO to estimate an initial flow angle, which is then refined in a DB step. Velocity magnitude is estimated along the flow direction using cross-correlation. It is shown that the suggested TO-DB method can improve the performance of velocity estimates compared to TO, and with a beamforming load, which is 4...
April 12, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28410103/the-ultrasound-needle-pulse
#17
Kevin Parker, Shujie Chen, Miguel Alonso
Recent theoretical developments have defined the conditions for forming a broadband beam that is narrow in axial extent but extended in range. The formulation is based on the classical Angular Spectrum decomposition and the requirement for arranging all spatial and temporal frequencies such that all components have constant phase propagation between planes. Analytic formulations are given for a one dimensional source and a 2D axisymmetric source, and comparisons are made against conventional focused Gaussian beams under similar conditions relevant to medical imaging systems...
April 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28410102/scanned-three-dimensional-intracardiac-arfi-and-swei-for-imaging-radiofrequency-ablation-lesions
#18
Peter Hollender, Lily Kuo, Virginia Chen, Stephanie Eyerly, Patrick Wolf, Gregg Trahey
Radiofrequency ablation (RFA) is used to locally disrupt electrical propagation in myocardium and treat arrhythmias, and direct visualization of ablation lesions by acoustic radiation force methods may benefit RFA procedures. This work compares four imaging modalities, B-Mode, ARFI, STL-SWEI and MTL-SWEI, in their ability to resolve RFA lesions in four ex vivo experiments. Ablation lesions are shown to be marked by at least a local halving of ARFI displacements and doubling of shear wave speeds. In a controlled ablation of ex vivo porcine and canine cardiac tissue, STL-SWEI and ARFI are shown to have similar CNR, better than MTL-SWEI and B-Mode...
April 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28391195/development-of-a-low-complexity-cost-effective-digital-beamformer-architecture-for-high-frequency-ultrasound-imaging
#19
Changhan Yoon, Hyung Ham Kim, K K Shung
This paper presents a low-complexity, cost-effective digital beamformer architecture for a high-frequency ultrasound imaging system. The proposed beamformer uses a look-up-table (LUT) and linear interpolation methods for computing the dynamic receive focusing delays and a post-filtering technique to minimize hardware complexity. In the post-filtering technique, channel radio-frequency (RF) data having the same fractional delay (i.e., 16f0 resolution) are aggregated prior to interpolation. Thus, only four polyphase structure filters are required in the developed beamformer...
April 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28391194/acoustic-wave-filter-technology-a-review
#20
Clemens Ruppel
Today, acoustic filters are the filter technology to meet the requirements with respect to performance dictated by the cellular phone standards and their form factor. Around 2 billion cellular phones are sold every year, and smart phones are of a very high percentage of approximately two thirds. Smart phones require a very high number of filter functions ranging from the low double-digit range up to almost triple digit numbers in the near future. In the frequency range up to 1 GHz surface acoustic wave (SAW) filters are almost exclusively employed, while in the higher frequency range bulk acoustic wave (BAW) and SAW filters are competing for their shares...
April 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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