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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/29035216/spiral-flow-phantom-for-ultrasound-flow-imaging-experimentation
#1
Billy Y S Yiu, Alfred C H Yu
As new ultrasound flow imaging methods are being developed, there is a growing need to devise appropriate flow phantoms that can holistically assess the accuracy of the derived flow estimates. In this paper, we present a novel spiral flow phantom design whose Archimedean spiral lumen naturally gives rise to multi-directional flow over all possible angles (i.e. from 0° to 360°). Developed using lost-core casting principles, the phantom geometry comprised a three-loop spiral (4 mm diameter, 5 mm pitch), and it was set to operate in steady flow mode (3 mL/s flow rate)...
October 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29028190/a-hybrid-solution-for-simultaneous-transfer-of-ultrastable-optical-frequency-rf-frequency-and-utc-time-tags-over-optical-fiber
#2
Przemyslaw Krehlik, Harald Schnatz, Lukasz Sliwczynski
We describe a fiber-optic solution for simultaneous distribution of all signals generated at today's most advanced time and frequency laboratories, i.e. an ultrastable optical reference frequency derived from an optical atomic clock, a radio frequency precisely linked to a realization of the SI-Second, and a realization of an atomic timescale, being the local representation of the virtual, global UTC timescale. In our solution both the phase of the optical carrier and the delay of electrical signals (10 MHz frequency reference and one pulse-persecond time tags) are stabilized against environmental perturbations influencing the fiber link instability and accuracy...
October 12, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28991738/focus-fourier-based-coded-ultrasound
#3
Almog Lahav, Tanya Chernyakova, Yonina C Eldar
Modern imaging systems typically use single-carrier short pulses for transducer excitation. Coded signals together with pulse compression are successfully used in radar and communication to increase the amount of transmitted energy. Previous research verified significant improvement in signal-tonoise ratio (SNR) and imaging depth for ultrasound imaging with coded signals. Since pulse compression needs to be applied at each transducer element, the implementation of coded excitation (CE) in array imaging is computationally complex...
October 6, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28981414/design-and-optimization-of-shf-composite-fbar-resonators
#4
Gayathri Pillai, Anurag A Zope, Julius Ming-Lin Tsai, Sheng-Shian Li
We propose an apodization technique based composite thin Film Bulk Acoustic wave Resonator (c-FBAR) design to enable the displacement and strain energy confinement at the central section of the resonator while in operation at the resonance mode. Sinc-shaped AlN on SOI apodized c-FBARs are designed to attain close to 90% energy localization. In this work, single crystal silicon as the mechanical layer and AlN piezoelectric material as the transducer layer of the resonator implemented by InvenSense Inc.'s AlN MEMS-CMOS platform renders an asymmetric feature to the traditional FBAR resonator...
October 5, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28981413/characterizing-the-acoustic-output-of-an-ultrasonic-propulsion-device-for-urinary-stones
#5
Bryan W Cunitz, Barbrina Dunmire, Michael R Bailey
A non-invasive ultrasound system to facilitate the passage of small kidney stones has been developed. The device incorporates a software based ultrasound platform programmed with B-mode and Doppler for visualizing stones, plus long duration focused pulses for repositioning stones using the same transducer. This paper characterizes the acoustic outputs of the ultrasonic propulsion device. Though the application and outputs are unique, measurements were performed based on regulatory standards for both diagnostic ultrasound and extracorporeal lithotripters...
October 2, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28976314/a-method-for-measuring-the-directional-response-of-ultrasound-receivers-in-the-range-0-3-mhz-to-80-mhz-using-a-laser-generated-ultrasound-source
#6
James A Guggenheim, Edward Z Zhang, Paul C Beard
A simple method for measuring the directivity of an ultrasound receiver is described. The method makes use of a custom-designed laser ultrasound (LUS) source which generates a large diameter (> 1 cm) broadband monopolar plane wave with a continuous frequency content extending from ≤330 kHz to ≈80 MHz. The plane wave is highly uniform in amplitude (±5% over > 8 mm) and phase (equivalent to <λ/7 at 80 MHz over ≥11 mm). To measure directivity, the source is rotated around the receiver under test in a compact centimetre-scale setup...
September 29, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28961111/inverse-problem-of-ultrasound-beamforming-with-sparsity-constraints-and-regularization
#7
Ece Ozkan, Valeriy Vishnevsky, Orcun Goksel
Ultrasound (US) beamforming is the process of reconstructing an image from acquired echo traces on several transducer elements. Typical beamforming approaches, such as Delay-And-Sum, perform simple projection operations, while techniques using statistical information also exist, e.g. adaptive, phase-coherence, Delay-Multiply-And-Sum, and sparse coding approaches. Inspired by the feasibility and success of inverse problem formulations in several image reconstruction problems, such as computed tomography, we herein devise an inverse problem approach for US beamforming...
September 28, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28961110/non-invasive-vascular-modulography-method-for-imaging-the-local-elasticity-of-atheroscle-rotic-plaques-simulation-and-in-vitro-vessel-phantom-study
#8
Jonathan Poree, Boris Chayer, Gilles Soulez, Jacques Ohayon, Guy Cloutier
Mechanical and morphological characterization of atherosclerotic lesions in carotid arteries remains an essential step for the evaluation of rupture prone plaques and the preven-tion of strokes. In this study, we propose a non-invasive imaging modulography method (NIV-iMod), which is able of reconstruct-ing a heterogeneous Young's modulus distribution of a carotid plaque from the Von Mises strain elastogram. Elastograms were computed with non-invasive ultrasound images using the La-grangian speckle model estimator (LSME) and a dynamic seg-mentation-optimization procedure to highlight mechanical heter-ogeneities...
September 28, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28961109/combined-2-d-vector-velocity-imaging-and-tracking-doppler-for-improved-vascular-blood-velocity-quantification
#9
Jorgen Avdal, Lasse Lovstakken, Hans Torp, Ingvild Kinn Ekroll
Measurement of the maximum blood flow velocity is the primary means for determining the degree of carotid stenosis using ultrasound. The current standard for estimating the maximum velocity is Pulsed Wave (PW) Doppler with manual angle correction, which is prone to error and interobserver variability. In addition, spectral broadening in the velocity spectra leads to overestimation of maximal velocities. In this work, we propose to combine two velocity estimation methods to reduce the bias and variability in maximum velocity measurements...
September 28, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28885153/three-dimensional-single-track-location-shear-wave-elasticity-imaging-stl-swei
#10
Peter Hollender, Samantha Lipman, Gregg Trahey
Conventional multiple track location shear wave elasticity imaging (MTL-SWEI) is a powerful tool for noninvasively estimating tissue elasticity. The resolution and noise levels of MTL-SWEI systems, however, are limited by ultrasound speckle. Single track location SWEI (STL-SWEI) is a novel variant which fixes the position of the tracking beam and modulates the push location to effectively cancel out the effects of speckle-induced bias. We present here a three-dimensional STL-SWEI system which provides full suppression of lateral and elevation speckle bias for high resolution volumetric elasticity imaging, and requires no spatial smoothing to make accurate measurements of shear wave speed...
September 6, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880172/spectrum-compensation-for-time-reversal-method-on-ultrasonic-target-detection-using-pulse-compression
#11
Dai Chimura, Ryo Toh, Seiichi Motooka
This paper discusses a method of time reversal (TR) for target detection using a signal with a higher signal-to-noise ratio (SNR) and higher resolution. To acquire a signal with a higher SNR and broader spectrum, we have proposed a sensitivity-compensated (SC) signal. In this study, we propose three types of sensitivity-compensated-for-time-reversal (SC-for-TR) signals. A sensitivity-compensated-amplitude-modulated-for-time-reversal signal and a sensitivity-compensated-frequency-modulated-for-time-reversal signal are calculated using squared spectrum compensation...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880171/q-factor-spectrum-of-a-piezoceramic-resonator-and-method-for-piezoelectric-loss-factor-determination
#12
A Mezheritsky
The quality factor (Q) spectrum of a piezoceramic resonator, as a Q-factor frequency dependence for the specific resonator and its vibrational modes, was determined under baseline low-excitation level with a new approach proposed. It was experimentally confirmed that the theoretical prediction [1] that the resonator Q-factor increases with frequency nearly linearly from the resonance reaching its maximum near the antiresonance. For the industrial PZT-5A piezoceramic the antiresonance-to-resonance quality factor ratio is 1...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880170/rapid-spatial-mapping-of-focused-ultrasound-fields-using-a-planar-fabry-p%C3%A3-rot-sensor
#13
Eleanor Martin, Edward Z Zhang, James A Guggenheim, Paul C Beard, Bradley E Treeby
Measurement of high acoustic pressures is necessary in order to fully characterise clinical high-intensity focused ultrasound (HIFU) fields, and for accurate validation of computational models of ultrasound propagation. However, many existing measurement devices are unable to withstand the extreme pressures generated in these fields, and those that can often exhibit low sensitivity. Here, a planar Fabry-Pérot interferometer with hard dielectric mirrors and spacer was designed, fabricated, and characterised and its suitability for measurement of nonlinear focused ultrasound fields was investigated...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880167/lead-free-piezoelectric-ceramic-coatings-fabricated-by-thermal-spray-process
#14
Kui Yao, Shuting Chen, Kun Guo, Chee Kiang Ivan Tan, Meysam Sharifzadeh Mirshekarloo, Francis Eng Hock Tay
The paper starts from a review on the progress in fabrication of piezoelectric ceramic coatings by thermal spray method. For our experimental work, two types of lead-free piezoelectric ceramic coatings, including potassium sodium niobate (KNN)-based and bismuth sodium titanate (BNT)-based, are fabricated by thermal spray process, and their structure, morphology and piezoelectric properties are characterized. Our obtained lead-free ceramic coatings exhibit single phase of perovskite structure, relatively dense morphology, and competitive piezoelectric coefficients...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880169/letters-noise-equalization-for-ultrafast-plane-wave-microvessel-imaging
#15
Pengfei Song, Armando Manduca, Joshua D Trzasko, Shigao Chen
Ultrafast plane wave microvessel imaging significantly improves ultrasound Doppler sensitivity by increasing the number of Doppler ensembles that can be collected within a short period of time. The rich spatiotemporal plane wave data also enables more robust clutter filtering based on singular value decomposition (SVD). However, due to the lack of transmit focusing, plane wave microvessel imaging is very susceptible to noise. This study was designed to: 1) study the relationship between ultrasound system noise (primarily time gain compensation-induced) and microvessel blood flow signal; 2) propose an adaptive and computationally cost-effective noise equalization method that is independent of hardware or software imaging settings to improve microvessel image quality...
September 1, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880168/a-new-dynamic-complex-baseband-pulse-compression-method-for-chirp-coded-excitation-in-medical-ultrasound-imaging
#16
Jinbum Kang, Yeajin Kim, Wooyoul Lee, Yangmo Yoo
Chirp-coded excitation can increase the signal-to-noise ratio (SNR) without degrading the axial resolution. Effective pulse compression (PC) is important to maintain the axial resolution and can be achieved with radio frequency (RF) and complex baseband (CBB) data (i.e., PCRF and PCCBB, respectively). PCCBB can further reduce the computational complexity compared to PCRF; however, PCCBB suffers from a degraded SNR due to tissue attenuation. In this study, we propose a new dynamic complex baseband pulse compression method (PCCBB-Dynamic) that can improve the SNR while compensating for tissue attenuation...
September 1, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880166/catheter-hydrophone-aberration-correction-for-transcranial-histotripsy-treatment-of-intracerebral-hemorrhage-ich-proof-of-concept
#17
Tyler Gerhardson, Jonathan R Sukovich, Aditya S Pandey, Timothy L Hall, Charles A Cain, Zhen Xu
Histotripsy is a minimally invasive ultrasound therapy that has shown rapid liquefaction of blood clots through human skullcaps in an in-vitro intracerebral hemorrhage (ICH) model. However, the efficiency of these treatments can be compromised if the skull induced aberrations are uncorrected. We have developed a catheter hydrophone which can perform aberration correction and drain the liquefied clot following histotripsy treatment. Histotripsy pulses were delivered through an excised human skullcap using a 256-element, 500 kHz hemisphere array transducer with a 15 cm focal distance...
August 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28880165/power-spectrum-computation-for-an-arbitrary-phase-noise-using-middleton-s-convolution-series-implementation-guideline-and-experimental-illustration
#18
Pierre Brochard, Thomas Sudmeyer, Stephane Schilt
In this work, we revisit the convolution series initially introduced by Middleton several decades ago to determine the power spectrum (or spectral lineshape) of a periodic signal from its phase noise power spectral density. This topic is of wide interest as it has an important impact in many scientific areas that involve lasers and oscillators. We introduce a simple guideline that enables a fairly straightforward computation of the power spectrum corresponding to an arbitrary phase noise. We show the benefit of this approach on a computational point of view, and apply it to various types of experimental signals with different phase noise levels, showing a very good agreement with the experimental spectra...
August 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28866490/hadamard-encoded-multi-pulses-for-contrast-enhanced-ultrasound-imaging
#19
Ping Gong, Pengfei Song, Shigao Chen
The development of contrast-enhanced ultrasound (CEUS) imaging offers great opportunities for new ultrasound clinical applications such as myocardial perfusion imaging and abdominal lesion characterization. In CEUS imaging, the contrast agents (i.e., microbubbles) are utilized to improve the contrast between blood and tissue based on their high nonlinearity under low ultrasound pressure. In this paper, we propose a new CEUS pulse sequence by combining Hadamard-encoded multi-pulses (HEM) with fundamental frequency bandpass filter (i...
August 30, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28866489/simultaneous-ultrasonic-measurement-of-thickness-and-speed-of-sound-in-elastic-plates-using-coded-excitation-signals
#20
Daniel A Kiefer, Michael Fink, Stefan J Rupitsch
Layer thickness and speed of sound are important parameters for non-destructive testing applications. If one of the parameters is known, the other one can be determined by simple time-of-flight measurement of ultrasound. However, often these parameters are both unknown. In this contribution, we examine and adapt ultrasonic imaging techniques using coded excitation signals to simultaneously measure the thickness and speed of sound in homogeneous elastic plates of unknown material. Good axial resolution is required to measure thin samples...
August 30, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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