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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/29752226/optimization-of-transmit-parameters-in-cardiac-strain-imaging-with-full-and-partial-aperture-coherent-compounding
#1
Vincent Sayseng, Julien Grondin, Elisa E Konofagou
Coherent compounding methods using the full or partial transmit aperture have been investigated as a possible means of increasing strain measurement accuracy in cardiac strain imaging; however, the optimal transmit parameters in either compounding approach have yet to be determined. The relationship between strain estimation accuracy and transmit parameters-specifically the subaperture, angular aperture, tilt angle, number of virtual sources, and frame rate-in partial aperture (subaperture compounding) and full aperture (steered compounding) fundamental mode cardiac imaging was thus investigated and compared...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733291/direct-write-laser-grayscale-lithography-for-multilayer-lead-zirconate-titanate-thin-films
#2
Robert R Benoit, Delaney M Jordan, Gabriel L Smith, Ronald G Polcawich, Sarah S Bedair, Daniel M Potrepka
Direct-write laser grayscale lithography has been used to facilitate a single-step patterning technique for multilayer lead zirconate titanate (PZT) thin films. A 2.55- -thick photoresist was patterned with a direct-write laser. The intensity of the laser was varied to create both tiered and sloped structures that are subsequently transferred into multilayer PZT(52/48) stacks using a single Ar ion-mill etch. Traditional processing requires a separate photolithography step and an ion mill etch for each layer of the substrate, which can be costly and time consuming...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733290/microwave-characterization-of-ba-substituted-pzt-and-zno-thin-films
#3
Davide Tierno, Matthijn Dekkers, Paul Wittendorp, Xiao Sun, Samuel C Bayer, Seth T King, Sven Van Elshocht, Marc Heyns, Iuliana P Radu, Christoph Adelmann
The microwave dielectric properties of (Ba0.1 Pb0.9 )(Zr0.52 Ti0.48 )O3 (BPZT) and ZnO thin films with thicknesses below were investigated. No significant dielectric relaxation was observed for both BPZT and ZnO up to 30 GHz. The intrinsic dielectric constant of BPZT was as high as 980 at 30 GHz. The absence of strong dielectric dispersion and loss peaks in the studied frequency range can be linked to the small grain diameters in these ultrathin films.
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733289/characterization-of-nonlinear-ultrasonic-diffuse-energy-imaging
#4
Jack Potter, Anthony J Croxford
Nonlinear ultrasonic diffuse energy imaging is a highly sensitive method for the measurement of elastic nonlinearity. While the underlying principles that govern the technique are understood, the precise behavior and sensitivity have not previously been quantified. This paper presents experimental, theoretical, and numerical modeling studies undertaken to characterize nonlinear diffuse energy imaging. The influence of incoherent noise, elastic nonlinearity, and instrumentation error are quantified. This paper enables the prediction of spatial sensitivity, aperture, and amplitude dependence of the measurement, all of which moves the technique toward industrial viability...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733288/low-temperature-variation-of-acoustic-velocity-in-pdms-for-high-frequency-applications
#5
Jeremy Streque, Didier Rouxel, Abdelkrim Talbi, Matthieu Thomassey, Brice Vincent
Polydimethylsiloxane (PDMS) and other related silicon-based polymers are among the most widely employed elastomeric materials in microsystems, owing to their physical and chemical properties. Meanwhile, surface acoustic wave (SAW) and bulk acoustic wave (BAW) sensors and filters have been vastly explored for sensing and wireless applications. Many fields could benefit from the combined use of acoustic wave devices, and polydimethylsiloxane-based soft-substrates, microsystems, or packaging elements. The mechanical constants of PDMS strongly depend on frequency, similar to rubber materials...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733287/dynamic-time-warping-temperature-compensation-for-guided-wave-structural-health-monitoring
#6
Alexander C S Douglass, Joel B Harley
Guided wave structural health monitoring is widely researched for remotely inspecting large structural areas. To detect, locate, and characterize damage, guided wave methods often compare data to a baseline signal. Yet, environmental variations create large differences between the baseline and the collected measurements. These variations hide damage signatures and cause false detection. Temperature compensation algorithms, such as baseline signal stretch and the scale transform have been used to optimally realign data to a baseline...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733286/parametric-shape-optimization-of-lens-focused-piezoelectric-ultrasound-transducers
#7
Gilles P L Thomas, Jean-Yves Chapelon, Jean-Christophe Bera, Cyril Lafon
Focused transducers composed of flat piezoelectric ceramic coupled with an acoustic lens present an economical alternative to curved piezoelectric ceramics and are already in use in a variety of fields. Using a displacement/pressure (u/p) mixed finite element formulation combined with parametric level-set functions to implicitly define the boundaries between the materials and the fluid-structure interface, a method to optimize the shape of acoustic lens made of either one or multiple materials is presented...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733285/a-column-row-parallel-ultrasound-imaging-architecture-for-3-d-plane-wave-imaging-and-tx-second-order-harmonic-distortion-reduction
#8
Kailiang Chen, Byung Chul Lee, Kai E Thomenius, Butrus T Khuri-Yakub, Hae-Seung Lee, Charles G Sodini
We propose a column-row-parallel imaging front-end architecture for integrated and low-power 3-D medical ultrasound imaging. The column-row-parallel architecture offers linear-scaling interconnection, acquisition, and programming time with row-by-row or column-by-column operations, while supporting volumetric imaging functionality and fault-tolerance against possible transducer element defects with per-element controls. The combination of column-parallel selection logic, row-parallel selection logic, and per-element selection logic reaches a balance between flexible imaging aperture definition and manageable imaging data/control interface to a 2-D array...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733284/actuation-of-piezoelectric-layered-beams-with-and-coupling
#9
Cuong H Nguyen, Ulrik Hanke, Einar Halvorsen
In this paper, we derive and compare the linear static bending of piezoelectric actuators with transversal ( ) and longitudinal ( ) coupling. The transducers are, respectively, structures utilizing top and bottom electrodes (TBEs) and interdigitated electrodes (IDEs). While the theory is well developed for the TBE beam, governing equations for the bending of the piezoelectric beams with IDEs are far less developed. We improve on this by deriving the governing equation for the IDE beam with an arbitrary number of layers and with coupling consistently included...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733283/two-stage-motion-correction-for-super-resolution-ultrasound-imaging-in-human-lower-limb
#10
Sevan Harput, Kirsten Christensen-Jeffries, Jemma Brown, Yuanwei Li, Katherine J Williams, Alun H Davies, Robert J Eckersley, Christopher Dunsby, Meng-Xing Tang
The structure of microvasculature cannot be resolved using conventional ultrasound (US) imaging due to the fundamental diffraction limit at clinical US frequencies. It is possible to overcome this resolution limitation by localizing individual microbubbles through multiple frames and forming a superresolved image, which usually requires seconds to minutes of acquisition. Over this time interval, motion is inevitable and tissue movement is typically a combination of large- and small-scale tissue translation and deformation...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733282/color-and-vector-flow-imaging-in-parallel-ultrasound-with-sub-nyquist-sampling
#11
Craig Madiena, Julia Faurie, Jonathan Poree, Damien Garcia
RF acquisition with a high-performance multichannel ultrasound system generates massive data sets in short periods of time, especially in "ultrafast" ultrasound when digital receive beamforming is required. Sampling at a rate four times the carrier frequency is the standard procedure since this rule complies with the Nyquist-Shannon sampling theorem and simplifies quadrature sampling. Bandpass sampling (or undersampling) outputs a bandpass signal at a rate lower than the maximal frequency without harmful aliasing...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733281/characterization-of-viscoelastic-materials-using-group-shear-wave-speeds
#12
Ned C Rouze, Yufeng Deng, Courtney A Trutna, Mark L Palmeri, Kathryn R Nightingale
Recent investigations of viscoelastic properties of materials have been performed by observing shear wave propagation following localized, impulsive excitations, and Fourier decomposing the shear wave signal to parameterize the frequency-dependent phase velocity using a material model. This paper describes a new method to characterize viscoelastic materials using group shear wave speeds , , and determined from the shear wave displacement, velocity, and acceleration signals, respectively. Materials are modeled using a two-parameter linear attenuation model with phase velocity and dispersion slope at a reference frequency of 200 Hz...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733280/motion-tolerant-unfocused-imaging-of-physiological-waveforms-for-blood-pressure-waveform-estimation-using-ultrasound
#13
Joohyun Seo, Sabino J Pietrangelo, Charles G Sodini, Hae-Seung Lee
This paper details unfocused imaging using single-element ultrasound transducers for motion tolerant arterial blood pressure (ABP) waveform estimation. The ABP waveform is estimated based on pulse wave velocity and arterial pulsation through Doppler and M-mode ultrasound. This paper discusses approaches to mitigate the effect of increased clutter due to unfocused imaging on blood flow and diameter waveform estimation. An intensity reduction model (IRM) estimator is described to track the change of diameter, which outperforms a complex cross-correlation model (C3M) estimator in low contrast environments...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733279/improved-plane-wave-ultrasound-beamforming-by-incorporating-angular-weighting-and-coherent-compounding-in-fourier-domain
#14
Chuan Chen, Gijs A G M Hendriks, Ruud J G van Sloun, Hendrik H G Hansen, Chris L de Korte
In this paper, a novel processing framework is introduced for Fourier-domain beamforming of plane-wave ultrasound data, which incorporates coherent compounding and angular weighting in the Fourier domain. Angular weighting implies spectral weighting by a 2-D steering-angle-dependent filtering template. The design of this filter is also optimized as part of this paper. Two widely used Fourier-domain plane-wave ultrasound beamforming methods, i.e., Lu's f-k and Stolt's f-k methods, were integrated in the framework...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733278/design-and-characterization-of-an-acoustically-and-structurally-matched-3-d-printed-model-for-transcranial-ultrasound-imaging
#15
Chen Bai, Meiling Ji, Ayache Bouakaz, Yujin Zong, Mingxi Wan
For investigating human transcranial ultrasound imaging (TUI) through the temporal bone, an intact human skull is needed. Since it is complex and expensive to obtain one, it requires that experiments are performed without excision or abrasion of the skull. Besides, to mimic blood circulation for the vessel target, cellulose tubes generally fit the vessel simulation with straight linear features. These issues, which limit experimental studies, can be overcome by designing a 3-D-printed skull model with acoustic and dimensional properties that match a real skull and a vessel model with curve and bifurcation...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733277/fourier-domain-shift-matching-a-robust-time-of-flight-approach-for-shear-wave-speed-estimation
#16
David Rosen, Jingfeng Jiang
Our primary objective of this work was to design and test a new time-of-flight (TOF) method that allows measurements of shear wave speed (SWS) following impulsive excitation in soft tissues. Particularly, under the assumption of the local plane shear wave, this work named the Fourier-domain shift matching (FDSM) method, estimates SWS by aligning a series of shear waveforms either temporally or spatially using a solution space deduced by characteristic curves of the well-known 1-D wave equation. The proposed SWS estimation method was tested using computer-simulated data, and tissue-mimicking phantom and ex vivo tissue experiments...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733276/high-frame-rate-speckle-tracking-echocardiography
#17
Philippe Joos, Jonathan Poree, Herve Liebgott, Didier Vray, Mathilde Baudet, Julia Faurie, Francois Tournoux, Guy Cloutier, Barbara Nicolas, Damien Garcia
Conventional echocardiography is the leading modality for noninvasive cardiac imaging. It has been recently illustrated that high-frame-rate echocardiography using diverging waves could improve cardiac assessment. The spatial resolution and contrast associated with this method are commonly improved by coherent compounding of steered beams. However, owing to fast tissue velocities in the myocardium, the summation process of successive diverging waves can lead to destructive interferences if motion compensation (MoCo) is not considered...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733275/noninvasive-estimation-of-pressure-changes-using-2-d-vector-velocity-ultrasound-an-experimental-study-with-in-vivo-examples
#18
Jacob Bjerring Olesen, Carlos Armando Villagomez-Hoyos, Niclas Dechau Moller, Caroline Ewertsen, Kristoffer Lindskov Hansen, Michael Bachmann Nielsen, Bo Bech, Lars Lonn, Marie Sand Traberg, Jorgen Arendt Jensen
A noninvasive method for estimating intravascular pressure changes using 2-D vector velocity is presented. The method was first validated on computational fluid dynamic (CFD) data and with catheter measurements on phantoms. Hereafter, the method was tested in vivo at the carotid bifurcation and at the aortic valve of two healthy volunteers. Ultrasound measurements were performed using the experimental scanner SARUS, in combination with an 8 MHz linear array transducer for experimental scans and a carotid scan, whereas a 3...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733274/quantitative-doppler-analysis-using-conventional-color-flow-imaging-acquisitions
#19
Yucel Karabiyik, Ingvild Kinn Ekroll, Sturla H Eik-Nes, Lasse Lovstakken
Interleaved acquisitions used in conventional triplex mode result in a tradeoff between the frame rate and the quality of velocity estimates. On the other hand, workflow becomes inefficient when the user has to switch between different modes, and measurement variability is increased. This paper investigates the use of power spectral Capon estimator in quantitative Doppler analysis using data acquired with conventional color flow imaging (CFI) schemes. To preserve the number of samples used for velocity estimation, only spatial averaging was utilized, and clutter rejection was performed after spectral estimation...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29733273/compressibility-and-density-weighting-for-ultrasound-scattering-tomography
#20
Quinn Barber, Roger J Zemp
A novel reconstruction technique based on delay-and-sum ultrasound tomography algorithms is introduced. This reconstruction technique enables ultrasound tomographic systems to produce compressibility- and density-weighted images (D-WI) for spherically symmetric ultrasound scatterers. The efficacy of this reconstruction technique was demonstrated with simulation and phantom experiments. Separation between a dense wire target and a compressible thread target within a phantom was quantified, showing an increased signal of the wire target for D-WIs...
May 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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