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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/30010559/fourier-domain-beamforming-and-structure-based-reconstruction-for-plane-wave-imaging
#1
Tanya Chernyakova, Regev Cohen, Rotem Mulayoff, Yael Sde-Chen, Christophe Fraschini, Jeremy Bercoff, Yonina C Eldar
Ultrafast imaging based on coherent plane-wave compounding is one of the most important recent developments in medical ultrasound. It significantly improves image quality and allows for much faster image acquisition. This technique, however, requires large computational loads motivating methods for sampling and processing rate reduction. In this work we extend the recently proposed frequency domain beamforming (FDBF) framework to plane-wave imaging. Beamforming in frequency yields the same image quality while using fewer samples...
July 16, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30010558/quantitative-assessment-of-the-effect-of-the-out-of-plane-movement-of-the-homogenous-ellipsoidal-model-of-the-left-ventricle-on-the-deformation-measures-estimated-using-2d-speckle-tracking-an-in-silico-study
#2
Jakub Zmigrodzki, Szymon Cygan, Aleksandra Wilczewska, Krzysztof Kaluzynski
Effect of the out of plane (OOP) movement amplitude on estimates of global displacements (radial, circumferential) and strains (radial εR, circumferential εC) was studied in an ellipsoidal model of the left ventricle using Finite Element Modeling (FEM) and synthetic ultrasonic data, short axis view. This effect was assessed using median of the Absolute Relative Error (RE) of the global parameters. FEM provided node displacements for synthetic ultrasonic data and reference data generation. Displacements were estimated using block-matching (BM) and B-spline (BS) methods...
July 13, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30010557/directivity-and-frequency-dependent-effective-sensitive-element-size-of-needle-hydrophones-predictions-from-four-theoretical-forms-compared-with-measurements
#3
Keith A Wear, Christian Baker, Piero Miloro
Directivity is a hydrophone specification that describes response as a function of angle of incidence. The goal of this study was to compare, in the context of needle hydrophones, the commonly-used rigid baffle (RB) model for hydrophone directivity to three alternative models: soft baffle (SB), unbaffled (UB), and rigid piston (RP). Directivity measurements were performed at 1, 2, 3, 4, 6, 8, and 10 MHz from ±70. in two orthogonal planes for two ceramic and two polymer needle hydrophones with nominal geometrical sensitive element diameters of 200, 400, 600, and 1000 μm...
July 13, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30010556/lag-one-coherence-as-a-metric-for-ultrasonic-image-quality
#4
Will Long, Nick Bottenus, Gregg E Trahey
Reliable assessment of image quality is an important but challenging task in complex imaging environments such as those encountered in vivo. To address this challenge, we propose a novel imaging metric, known as the lag-one coherence (LOC), which leverages the spatial coherence between nearest-neighbor array elements to provide a local measure of thermal and acoustic noise. In this paper, we derive the theory that relates LOC and the conventional image quality metrics of contrast and contrast-to-noise ratio (CNR) to channel noise...
July 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30010555/design-and-implementation-of-a-transmit-receive-ultrasound-phased-array-for-brain-applications
#5
Hao-Li Liu, Chih-Hung Tsai, Chen-Kai Jan, Hsin-Yu Chang, Sheng-Min Huang, Meng-Lin Li, Weibao Qiu, Hairong Zheng
Focused ultrasound phased array systems have attracted increased attention for brain therapy applications. However, such systems currently lack a direct and real-time method to intraoperatively monitor ultrasound pressure distribution for securing treatment. This study proposes a dual-mode ultrasound phased array system design to support transmit/receive operations for concurrent ultrasound exposure and backscattered focal-beam reconstruction through a spherically focused ultrasound array. A 256-channel ultrasound transmission system was used to transmit focused ultrasonic energy (full 256 channels), with an extended implementation of multiple-channel receiving function (up to 64 channels) using the same 256-channel ultrasound array...
July 12, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30004875/long-term-behavior-of-the-doris-oscillator-under-radiation-the-jason-2-case
#6
Alexandre Belli, Pierre Exertier
The paper discusses the issues of radiation exposure that especially occur on the Doppler Orbitography and Radiopositioning Integrated on Satellite (DORIS) Ultra-Stable-Oscillator (USO) that has been placed on Jason-2 oceanography mission as the reference clock. We have studied the frequency response of the Jason-2 USO (launched in June 2008, at 66° of inclination and 1336 km of altitude) over 8.5 years. This is the only mission that provides different sources of data, internal and external, which permit a precise description of the oscillator behavior using several assumptions...
July 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30004874/on-combination-of-hadamard-encoded-multi-pulses-and-multiplane-wave-transmission-in-contrast-enhanced-ultrasound-imaging
#7
Ping Gong, Pengfei Song, Chengwu Huang, Shigao Chen
Contrast-enhanced ultrasound (CEUS) imaging has great potential for use in many new ultrasound clinical applications. We recently proposed a novel CEUS imaging sequence, Hadamard-encoded multi-pulses (HEM), to improve the signal-to-noise (SNR) and contrast-to-tissue ratio (CTR) as compared to other classic CEUS methods. HEM increases microbubble responses by using longer coded transmit pulses and the fast polarity change between coded pulses. In this study, we propose to combine the HEM pulse with multiplane wave (MW) imaging technique to further improve CEUS imaging SNR and CNR...
July 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30004873/dual-wavelength-good-bad-cavity-laser-system-for-cavity-stabilized-active-optical-clock
#8
Duo Pan, Tiantian Shi, Jingbiao Chen
Active optical clock (AOC) has the intrinsic suppression of the influence of cavity's noise on the output frequency, giving rise to the potentially ultra-narrow linewidth. To break the cavity's thermal noise limitation by taking full advantage of the AOC'S principle, as well as to achieve a long-term instability, we propose a scheme of cavity stabilized active optical clock (CSAOC). The system consists of two key procedures: the dual-wavelength (DW) output signals share a same cavity and work in the good and the bad cavity regime respectively...
July 10, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30004872/3d-perfusion-imaging-using-principal-curvature-detection-rendering
#9
Charles Tremblay-Darveau, Paul S Sheeran, Cindy Kim Vu, Ross Williams, Matthew Bruce, Peter N Burns
Three-dimensional contrast-enhanced ultrasound (CEUS) imaging presents a clear advantage over its 2D counterpart in detecting and characterizing suspicious lesions as it properly surveys the inherent heterogeneity of tumours. However, 3D CEUS is also slow compared to 2D CEUS and tends to undersample the microbubble wash-in. This makes it difficult to resolve the feeding vessels, an important oncogenic marker, from the background perfusion cloud. Contrast-enhanced Doppler is helpful in isolating this conduit flow, but requires too many pulses in conventional line-by-line beamforming design...
July 10, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994396/loss-mechanisms-determining-the-quality-factors-in-quartz-tuning-forks-vibrating-at-the-fundamental-and-first-overtone-mode
#10
Pietro Patimisco, Angelo Sampaolo, Verena Mackowiak, Hubert Rossmadl, Alex Cable, Frank K Tittel, Vincenzo Spagnolo
Quartz tuning forks (QTFs) are piezo-transducers that have been implemented for numerous applications, such as chemical gas sensing, atomic-force microscopy, rheology and industrial process control. The most important parameter for QTFs sensing application is the resonance quality factor. An experimental investigation and theoretical analysis of the influence of QTFs geometries on the quality factor Q of the flexural fundamental and first overtone resonance modes is reported. The resonance frequencies and related Q-factors for five different QTFs have been measured...
July 5, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994395/hierarchical-cascading-algorithm-for-2d-fem-simulation-of-finite-saw-devices
#11
Julius Koskela, Victor Plessky, Balam Willemsen, Patrick Turner, Bob Hammond, Neal Fenzi
Application of the finite element method (FEM) for the simulation of SAW devices has been constrained by the large number of degrees-of-freedom required, resulting in large memory usage and long computation times. We propose a new 2D algorithm which takes advantage of the periodic structure typical of SAW devices. The device is partitioned into small, repeatedly occurring building blocks. Only unique building blocks are simulated with FEM. The device geometry is presented as a hierarchical tree of cascading operations, where smaller blocks are combined into larger blocks...
July 2, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994706/assessment-of-carotid-artery-plaque-components-with-machine-learning-classification-using-homodyned-k-parametric-maps-and-elastograms
#12
Marie-Helene Roy-Cardinal, Francois Destrempes, Gilles Soulez, Guy Cloutier
Quantitative ultrasound (QUS) imaging methods including elastography, echogenicity analysis and speckle statistical modeling are available from a single ultrasound radiofrequency data acquisition. Since these ultrasound imaging methods provide complementary quantitative tissue information, characterization of carotid artery plaques may gain from their combination. Sixty-six patients with symptomatic (n=26) and asymptomatic (n=40) carotid atherosclerotic plaques were included in the study. Of these, 31 underwent magnetic resonance imaging (MRI) to characterize plaque vulnerability and quantify plaque components...
June 29, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994705/white-rabbit-clock-synchronization-ultimate-limits-on-close-in-phase-noise-and-short-term-stability-due-to-fpga-implementation
#13
M Rizzi, M Lipinski, P Ferrari, S Rinaldi, A Flammini
This article investigates the ultimate limits of White Rabbit (WR), an high-accuracy time distribution system based on FPGA. The knowledge of such limits is essential for new emerging applications that are evaluating WR. In this article, we identify and study the key elements in the WR synchronization: the Digital Dual Mixer Time Difference phase detector and the Gigabit Ethernet transceiver. The benchmarks and experimental analysis of these key elements allow us to determine the WR Switch performance limits and evaluate their evolution with newer FPGAs...
June 29, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994704/simultaneous-azimuth-and-fresnel-elevation-safe-compounding-a-fast-3d-imaging-technique-for-crossed-electrode-arrays
#14
Katherine Latham, Chris Ceroici, Christopher Samson, Roger J Zemp, Jeremy A Brown
We have developed a new, fast and simple 3D imaging approach referred to as Simultaneous Azimuth and Fresnel Elevation (SAFE) compounding using a bias-sensitive crossed-electrode array. The principle behind this technique is to perform conventional plane wave compounding with a back set of electrodes, while implementing a reconfigurable Fresnel elevation lens with an orthogonal set of front electrodes. While a Fresnel lens would usually result in unacceptable secondary lobe levels, these lobes can be suppressed by compounding different Fresnel patterns...
June 28, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994703/doppler-based-motion-compensation-strategies-for-3d-diverging-wave-compounding-and-multi-plane-transmit-beamforming-a-simulation-study
#15
Yinran Chen, Jan D'hooge, Jianwen Luo
Fast imaging of the heart has shown promise towards bringing new diagnostic information. Although most studies to date have been based on two-dimensional (2D) imaging technology, the ultimate diagnostic tool would enable fast 3D echocardiography. Hereto, 3D diverging wave compounding (DWC) and 3D multi-line-transmit (MLT) beamforming have recently been proposed. Moreover, in our recent study, a hybrid technique was proposed in which multiple planar diverging waves were transmitted (i.e., multi-plane-transmit, MPT)...
June 28, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994675/field-characterization-and-compensation-of-vibrational-non-uniformity-for-a-256-element-focused-ultrasound-phased-array
#16
Mohamed A Ghanem, Adam D Maxwell, Wayne Kreider, Bryan W Cunitz, Vera A Khokhlova, Oleg A Sapozhnikov, Michael R Bailey
Multi-element focused ultrasound phased arrays have been used in therapeutic applications to treat large tissue volumes by electronic steering of the focus, to target multiple simultaneous foci, and to correct aberration caused by inhomogeneous tissue pathways. There is an increasing interest in using arrays to generate more complex beam shapes and corresponding acoustic radiation force patterns for manipulation of particles such as kidney stones. Toward this end, experimental and computational tools are needed to enable accurate delivery of desired transducer vibrations and corresponding ultrasound fields...
June 27, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994674/joint-subarray-coherence-and-minimum-variance-beamformer-for-multi-transmission-ultrasound-imaging-modalities
#17
Yanxing Qi, Yuanyuan Wang, Wei Guo
Multi-transmission modalities such as plane wave compounding (PWC) and synthetic aperture (SA) imaging are promising techniques for ultrafast ultrasound imaging. Adaptive beamformers have been proposed to improve the imaging quality. Two common categories of adaptive beamformers are the minimum variance (MV) based beamformers and the coherence factor (CF) based beamformers. The MV can significantly improve the resolution while lacking robustness. It is also computationally expensive for multi-transmission modalities...
June 27, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994672/3d-velocity-and-volume-flow-measurement-in-vivo-using-speckle-decorrelation-and-2d-high-frame-rate-contrast-enhanced-ultrasound
#18
Xiaowei Zhou, Chee Hau Leow, Ethan Rowland, Kai Riemer, Jonathan M Rubin, Peter D Weinberg, Mengxing Tang
Being able to measure 3D flow velocity and volumetric flow rate effectively in the cardiovascular system is valuable but remains a significant challenge in both clinical practice and research. Currently there has not been an effective and practical solution to the measurement of volume flow using ultrasound imaging systems due to challenges in existing 3D imaging techniques and high system cost. In this study, a new technique for quantifying volumetric flow rate from the crosssectional imaging plane of the blood vessel was developed by using speckle decorrelation, 2D high frame rate imaging with a standard 1D array transducer, microbubble contrast agents, and ultrasound imaging velocimetry (UIV)...
June 27, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994671/phase-noise-measurements-of-aln-contour-mode-resonators-with-carrier-suppression-technique
#19
E Vaillant, F Sthal, J Imbaud, V Soumann, P Abbe, L Arapan, F X Esnault, G Cibiel, J Segovia-Fernandez, G Piazza
In this paper, the phase noise of aluminum nitride contour mode resonators is investigated using a passive measurement system with carrier suppression. The purpose is to make careful measurements of the performance of AlN resonators in order to better understand and clarify previously reported frequency instability in these devices. The resonant frequencies of the resonators are around 220 MHz. The motional parameters, the thermal behavior and the nonlinear power effect of these resonators have been evaluated...
June 27, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29994673/ultrasound-localization-microscopy-and-super-resolution-a-state-of-the-art
#20
Olivier Couture, Vincent Hingot, Baptiste Heiles, Pauline Muleki-Seya, Mickael Tanter
Because it drives the compromise between resolution and penetration, the diffraction-limit has long represented an unreachable summit to conquer in ultrasound imaging. Within a few years after the introduction of optical localization microscopy, we proposed its acoustic alter-ego that exploits the micrometric localization of microbubble contrast agents to reconstruct the finest vessels in the body in-depth. The various groups now working on the subject are optimizing the localization precision, microbubble separation, acquisition time, tracking and velocimetry to improve the capacity of ultrasound localization microscopy (ULM) to detect and distinguish vessels much smaller than the wavelength...
June 26, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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