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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/28880169/noise-equalization-for-ultrafast-plane-wave-microvessel-imaging
#10
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 enable more robust clutter filtering based on singular value decomposition. However, due to the lack of transmit focusing, plane wave microvessel imaging is very susceptible to noise. This paper was designed to: 1) study the relationship between ultrasound system noise (primarily time gain compensation induced) and microvessel blood flow signal and 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...
November 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-proof-of-concept
#11
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 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 (AC) 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...
November 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28866490/hadamard-encoded-multipulses-for-contrast-enhanced-ultrasound-imaging
#12
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 multipulses (HEM) with fundamental frequency bandpass filter (i...
November 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809681/a-prototype-therapy-system-for-transcutaneous-application-of-boiling-histotripsy
#13
Adam D Maxwell, Petr V Yuldashev, Wayne Kreider, Tatiana D Khokhlova, George R Schade, Timothy L Hall, Oleg A Sapozhnikov, Michael R Bailey, Vera A Khokhlova
Boiling histotripsy (BH) is a method of focused ultrasound surgery that noninvasively applies millisecond-length pulses with high-amplitude shock fronts to generate liquefied lesions in tissue. Such a technique requires unique outputs compared to a focused ultrasound thermal therapy apparatus, particularly to achieve high in situ pressure levels through intervening tissue. This paper describes the design and characterization of a system capable of producing the necessary pressure to transcutaneously administer BH therapy through clinically relevant overlying tissue paths using pulses with duration up to 10 ms...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796617/segmentation-of-3-d-high-frequency-ultrasound-images-of-human-lymph-nodes-using-graph-cut-with-energy-functional-adapted-to-local-intensity-distribution
#14
Jen-Wei Kuo, Jonathan Mamou, Yao Wang, Emi Saegusa-Beecroft, Junji Machi, Ernest J Feleppa
Previous studies by our group have shown that 3-D high-frequency quantitative ultrasound (QUS) methods have the potential to differentiate metastatic lymph nodes (LNs) from cancer-free LNs dissected from human cancer patients. To successfully perform these methods inside the LN parenchyma (LNP), an automatic segmentation method is highly desired to exclude the surrounding thin layer of fat from QUS processing and accurately correct for ultrasound attenuation. In high-frequency ultrasound images of LNs, the intensity distribution of LNP and fat varies spatially because of acoustic attenuation and focusing effects...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796616/wireless-power-transfer-to-millimeter-sized-nodes-using-airborne-ultrasound
#15
Angad S Rekhi, Butrus T Khuri-Yakub, Amin Arbabian
We propose the use of airborne ultrasound for wireless power transfer to mm-sized nodes, with intended application in the next generation of the Internet of Things (IoT). We show through simulation that ultrasonic power transfer can deliver 50 [Formula: see text] to a mm-sized node 0.88 m away from a ~ 50-kHz, 25-cm(2) transmitter array, with the peak pressure remaining below recommended limits in air, and with load power increasing with transmitter area. We report wireless power recovery measurements with a precharged capacitive micromachined ultrasonic transducer, demonstrating a load power of 5 [Formula: see text] at a simulated distance of 1...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28796615/effects-of-signal-saturation-on-qus-parameter-estimates-based-on-high-frequency-ultrasound-signals-acquired-from-isolated-cancerous-lymph-nodes
#16
Kazuki Tamura, Jonathan Mamou, Alain Coron, Kenji Yoshida, Ernest J Feleppa, Tadashi Yamaguchi
Choosing an appropriate dynamic range (DR) for acquiring radio frequency (RF) data from a high-frequency-ultrasound (HFU) system is challenging because signals can vary greatly in amplitude as a result of focusing and attenuation effects. In addition, quantitative ultrasound (QUS) results are altered by saturated data. In this paper, the effects of saturation on QUS estimates of effective scatterer diameter (ESD) and effective acoustic concentration (EAC) were quantified using simulated and experimental RF data...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792894/high-quality-plane-wave-compounding-using-convolutional-neural-networks
#17
Maxime Gasse, Fabien Millioz, Emmanuel Roux, Damien Garcia, Herve Liebgott, Denis Friboulet
Single plane wave (PW) imaging produces ultrasound images of poor quality at high frame rates (ultrafast). High-quality PW imaging usually relies on the coherent compounding of several successive steered emissions (typically more than ten), which in turn results in a decreased frame rate. We propose a new strategy to reduce the number of emitted PWs by learning a compounding operation from data, i.e., by training a convolutional neural network to reconstruct high-quality images using a small number of transmissions...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792893/large-stroke-high-fidelity-pzn-pt-single-crystal-stake-actuator
#18
Yu Huang, Yuexue Xia, Dian Hua Lin, Kui Yao, Leong Chew Lim
A new piezoelectric actuator design, called "Stake" actuator, is proposed and demonstrated in this paper. As an example, the stake actuator is made of four d32 -mode PZN-5.5%PT single crystals (SCs), each of 25 mm ( L ) ×8 mm ( W ) ×0.4 mm (T) in dimensions, bonded with the aid of polycarbonate edge guide-cum-stiffeners into a square-pipe configuration for improved bending and twisting strengths and capped with top and bottom pedestals made of 1.5-mm-thick anodized aluminum. The resultant stake actuator measured 9 mm ×9 mm ×28 mm...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28792892/eemd-domain-ar-spectral-method-for-mean-scatterer-spacing-estimation-of-breast-tumors-from-ultrasound-backscattered-rf-data
#19
Navid Ibtehaj Nizam, S Kaisar Alam, Md Kamrul Hasan
We present a novel method for estimating the mean scatterer spacing (MSS) of breast tumors using ensemble empirical mode decomposition (EEMD) domain analysis of deconvolved backscattered radio frequency (RF) data. The autoregressive (AR) spectrum from which the MSS is estimated is obtained from the intrinsic mode functions (IMFs) due to regular scatterers embedded in RF data corrupted by the diffuse scatterers. The IMFs are chosen by giving priority to the presence of an enhanced fundamental harmonic and the presence of a greater number of higher harmonics in the AR spectrum estimated from the IMFs...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28767367/3-d-in-vitro-acoustic-super-resolution-and-super-resolved-velocity-mapping-using-microbubbles
#20
Kirsten Christensen-Jeffries, Jemma Brown, Paul Aljabar, Mengxing Tang, Christopher Dunsby, Robert J Eckersley
Standard clinical ultrasound (US) imaging frequencies are unable to resolve microvascular structures due to the fundamental diffraction limit of US waves. Recent demonstrations of 2-D super-resolution both in vitro and in vivo have demonstrated that fine vascular structures can be visualized using acoustic single bubble localization. Visualization of more complex and disordered 3-D vasculature, such as that of a tumor, requires an acquisition strategy which can additionally localize bubbles in the elevational plane with high precision in order to generate super-resolution in all three dimensions...
October 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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