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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

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https://www.readbyqxmd.com/read/28715329/phased-array-imaging-of-complex-geometry-composite-components
#1
Alex J Brath, Francesco Simonetti, Francesco Simonetti
Progress in computational fluid dynamics (CFD) and the availability of new composite materials are driving major advances in the design of aerospace engine components which now have highly complex geometries optimized to maximize system performance. However, shape complexity poses significant challenges to traditional non-destructive evaluation (NDE) methods whose sensitivity and selectivity rapidly decrease as surface curvature increases. Additionally, new aerospace materials typically exhibit an intricate microstructure that further complicates the inspection...
July 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28708553/dispersion-differences-and-consistency-of-artificial-periodic-structures
#2
Z B Cheng, W K Lin, Z F Shi
Dispersion differences and consistency of artificial periodic structures, including phononic crystals, elastic metamaterials as well as periodic structures composited of phononic crystals and elastic metamaterials, are investigated in this paper. By developing a K(ω) method, complex dispersion relations and group/phase velocity curves of both the single mechanism periodic structures and the mixing mechanism periodic structures are calculated at first, from which dispersion differences of artificial periodic structures are discussed...
July 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28708552/dual-phase-transmit-focusing-for-multi-angle-compound-shear-wave-elasticity-imaging
#3
Heechul Yoon, Salavat R Aglyamov, Stanislav Y Emelianov
Shear wave elasticity imaging (SWEI) enables the quantitative assessment of the mechanical properties of tissue. In SWEI, the effective generation of acoustic radiation force is of paramount importance. Consequently, several research groups have investigated various transmit beamforming and pulse-sequencing methods. To further improve the efficiency of shear wave generation, and therefore, to increase the quality of SWEI, we introduce a technique referred to as "multi-angle compound SWEI" (MAC-SWEI), which uses simultaneous multi-angular push beams created by dual-phase transmit focusing...
July 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28708551/indoor-airborne-ultrasonic-wireless-communication-using-ofdm-methods
#4
Wentao Jiang, William M D Wright
Concerns still exist over the safety of prolonged exposure to radio frequency (RF) wireless transmissions and there are also potential data security issues due to remote signal interception techniques such as Bluesniping. Airborne ultrasound may be used as an alternative to RF for indoor wireless communication systems for securely transmitting data over short ranges, as signals are difficult to intercept from outside the room. Two types of air-coupled capacitive ultrasonic transducer were used in the implementation of an indoor airborne wireless communication system...
July 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28692972/tissue-acousto-electric-effect-modeling-from-solid-mechanics-theory
#5
Xizi Song, Yexian Qin, Yanbin Xu, Pier Ingram, Russell S Witte, Feng Dong
The acousto-electric (AE) effect is a basic physical phenomenon which underlies the changes made in the conductivity of a medium by the application of focused ultrasound. Recently, based on AE effect, several biomedical imaging techniques have been widely studied, such as ultrasound modulated electrical impedance tomography (UMEIT) and ultrasound current source density imaging (UCSDI). To further investigate the mechanism of the AE effect in tissue, and to provide guidance for such studies, we have modeled the tissue AE effect using the theory of solid mechanics...
July 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28682250/effects-of-bi-zn2-3nb1-3-o3-modification-on-the-relaxor-behavior-and-piezoelectricity-of-pb-mg1-3nb2-3-o3-pbtio3-ceramics
#6
Zenghui Liu, Hua Wu, Alisa Paterson, Wei Ren, Zuo-Guang Ye
Relaxor lead magnesium niobate (PMN)-based materials exhibit complex structures and unusual properties that have been puzzling researchers for decades. In this work, a new ternary solid solution of Pb(Mg₁/₃Nb₂/₃)O₃-PbTiO₃- Bi(Zn₂/₃Nb₁/₃)O₃ (PMN-PT-BZN) is prepared in the form of ceramics, and the effects of the incorporation of BZN into the PMN-PT binary system are investigated. The crystal structure favors a pseudocubic symmetry and the relaxor properties are enhanced as the concentration of BZN increases...
June 29, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28678705/piezoelectric-performance-and-hydrostatic-parameters-of-novel-2-2-type-composites
#7
Vitaly Yu Topolov, Christopher R Bowen, Andrey V Krivoruchko
This paper provides a detailed study of the structure - piezoelectric property relationships and the hydrostatic response of 2-2-type composites based on relaxor-ferroelectric 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystal material. Type I layers in the composite system are represented by a single-domain [111]-poled single crystal. Changes in the orientation of the crystallographic axes in the Type I layer are undertaken to determine the maximum values of the hydrostatic piezoelectric coefficients dh*, gh*, and eh*, and squared figure of merit dh* gh* of the composite...
June 27, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28650811/regularized-spectral-log-difference-technique-for-ultrasonic-attenuation-imaging
#8
Andres L Coila, Roberto J Lavarello
The attenuation coefficient slope (ACS) has the potential to be used for tissue characterization and as a diagnostic ultrasound tool, hence complementing B-mode images. The ACS can be valuable for estimation of other ultrasound parameters such as the backscatter coefficient. There is a well-known trade-off between the precision of the estimated ACS values and the data block size used in spectral-based techniques such as the spectral log difference (SLD). This trade-off limits the practical usefulness of spectral-based attenuation imaging techniques...
June 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28650810/expanding-acquisition-and-clutter-filter-dimensions-for-improved-perfusion-sensitivity
#9
Min Woo Kim, Craig K Abbey, Jamila Hedhli, Lawrence W Dobrucki, Michael F Insana
A method is explored for increasing the sensitivity of power-Doppler imaging without contrast enhancement. We acquire 1-10 s of echo signals and arrange it into a 3-D spatiotemporal data array. An eigenfilter developed to preserve all three dimensions of the array yields power estimates for blood flow and perfusion that are well separated from tissue clutter. This method is applied at high frequency (24 MHz pulses) to a murine model of an ischemic hindlimb. We demonstrate enhancements to tissue perfusion maps in normal and ischemic tissues...
June 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28650809/beam-diffraction-effects-in-the-backward-wave-regions-of-viscoelastic-leaky-lamb-modes-for-plate-transmission-at-normal-incidence
#10
Magne Aanes, Kjetil D Lohne, Per Lunde, Magne Vestrheim
Plane-wave theory for fluid-embedded isotropic plates is often used in ultrasonic guided-wave applications, and to estimate wall thickness, corrosion, or sound velocities in plates and pipes. In such structures, measured ultrasonic transmission through the solid material is affected by acoustic beam diffraction effects, and the results may deviate from plane-wave descriptions, which are insufficient to describe the complex effects that occur. When exciting a fluid-embedded steel plate with a pulsed ultrasonic beam at normal incidence, resonance frequency downshift, axial sound pressure level (SPL) increase, and beam narrowing have been observed, for measured resonance peaks in the frequency regions of certain leaky Lamb mode branches of the plate...
June 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28650808/histotripsy-treatment-of-s-aureus-biofilms-on-surgical-mesh-samples-under-varying-pulse-durations
#11
Timothy A Bigelow, Clayton L Thomas, Huaiqing Wu, Kamal M F Itani
Prior studies demonstrated that histotripsy generated by high-intensity tone bursts to excite a bubble cloud adjacent to a medical implant can destroy the bacteria biofilm responsible for the infection. The goal of this study was to treat S. aureus biofilms on surgical mesh samples while varying the number of cycles in the tone burst to minimize collateral tissue damage while maximizing therapy effectiveness. S. aureus biofilms were grown on 1 cm square surgical mesh samples. The biofilms were then treated in vitro using a spherically focused transducer (1...
June 22, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28650807/simultaneous-ultrasound-therapy-and-monitoring-of-microbubble-seeded-acoustic-cavitation-using-a-single-element-transducer
#12
Sophie V Heymans, Christine F Martindale, Andrej Suler, Antonios N Pouliopoulos, Robert J Dickinson, James J Choi
Ultrasound-driven microbubble activity is used in therapeutic applications such as blood clot dissolution and targeted drug delivery. The safety and performance of these technologies are linked to the type and distribution of microbubble activities produced within the targeted area, but controlling and monitoring these activities in vivo and in real-time has proven to be difficult. As therapeutic pulses are often ms-long, microbubble monitoring currently requires a separate transducer used in a passive reception mode...
June 22, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28644805/development-of-real-time-three-dimensional-photoacoustic-imaging-system-employing-spherically-curved-array-transducer
#13
Ryo Nagaoka, Takuya Tabata Ryo Takagi, Shin Yoshizawa, Shin-Ichiro Umemura, Yoshifumi Saijo
Photoacoustic imaging is a promising imaging modality to visualize specific living tissues based on the light absorption coefficients without dyeing. In this study, a real-time PA imaging system with a tunable laser was newly developed with an originally designed spherically curved array transducer. Five different series of experiments were conducted to validate the PA measurement system. The peak frequency of the transducer response was 17.7 MHz, and a volume-imaging rate of 3D volume imaging was 10 - 20 volumes per second...
June 21, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28644804/global-time-delay-estimation-in-ultrasound-elastography
#14
Hoda S Hashemi, Hassan Rivaz
A critical step in quasi-static ultrasound elastography is estimation of time-delay between two frames of radiofrequency (RF) data that are obtained while the tissue is undergoing deformation. This paper presents a novel technique for timedelay estimation (TDE) of all samples of RF data simultaneously, thereby exploiting all the information in RF data for TDE. A nonlinear cost function that incorporates similarity of RF data intensity and prior information of displacement continuity is formulated. Optimization of this function involves searching for TDE of all samples of the RF data, rendering the optimization intractable with conventional techniques given that the number of variables can be approximately one million...
June 21, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28644803/cardiac-strain-imaging-with-coherent-compounding-of-diverging-waves
#15
Julien Grondin, Vincent Sayseng, Elisa E Konofagou
Current methods of cardiac strain imaging at high frame rate suffer from motion matching artifacts or poor lateral resolution. Coherent compounding has been shown to improve echocardiographic image quality while maintaining high frame rate but has never been used to image cardiac strain. However, myocardial velocity can have an impact on coherent compounding due to displacements between frames. The objective of this study was to investigate the feasibility and performance of coherent compounding for cardiac strain imaging at a low and a high myocardial velocity...
June 20, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28613167/a-light-illumination-enhancement-device-for-photoacoustic-imaging-i-in-vivo-i-animal-study
#16
Jaesok Yu, Joel S Schuman, Jung-Kun Lee, Sang Goo Lee, Jin Ho Chang, Kang Kim
Photoacoustic (PA) imaging detects acoustic signals generated by thermal expansion of light excited tissue or contrast agents. PA signal amplitude and image quality directly depend on the light fluence at the target depth. With conventional PA imaging systems, approximately 30% energy of incident light at the near-infrared region would be lost due to reflection on the skin surface. Such light loss directly leads to a reduction of PA signal and image quality. A new light delivery scheme that collects and re-distributes reflected light energy was recently suggested, which is called the light catcher...
June 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28613166/design-consideration-of-saw-baw-band-reject-filters-embedded-in-impedance-converter
#17
Yulin Huang, Jingfu Bao, Gongbin Tang, Qiaozhen Zhang, Tatsuya Omori, Ken-Ya Hashimoto
This paper discusses design of SAW-BAW-based band reject filters composed of the impedance converters, where capacitive elements are replaced with SAW/BAW resonators. First, basic properties of the unit cell are studied. It is shown how basic properties of a unit cell change with the design. It is also shown that when two notches caused by the resonators are placed in proximity, two synergy effects occur: (i) an extra matching point appears on one side of the transition band. This makes the insertion loss at the point smaller and the transition band steeper, and (ii) the dip level becomes deeper, and the total rejection level improves...
June 8, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28574351/fabrication-and-characterization-of-a-20-mhz-microlinear-phased-array-transducer-for-intervention-guidance
#18
Chi Tat Chiu, Bong Jin Kang, Payam Eliahoo, Theodore Abraham, K K Shung
This paper describes the design and fabrication of a miniature ultrasonic phased array transducer used for intervention guidance. Currently ultrasound probes are often placed at the body surface of the patients, leading to several drawbacks including the limitation of penetration and image quality. In order to improve the reliability of the guiding process, we propose a miniature phased array transducer that can be placed adjacent to the intervention device during the interventional procedure. In this paper, we report the work that has been carried out on the development of this miniature phased array transducer...
May 29, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28574350/characterization-of-kerfless-linear-arrays-based-on-pzt-thick-film
#19
Tomasz Zawada, Louise Bierregaard, Erling Ringgaard, Ruichao Xu, Michele Guizzetti, Franck Levassort, Dominique Certon
Multi-element transducers enabling novel cost-effective fabrication of imaging arrays for medical applications have been presented earlier. Due to the favorable low lateral coupling of the screen-printed PZT, the elements can be defined by the top electrode pattern only, leading to a kerfless design with low cross-talk between the elements. The thick-film based linear arrays have proved to be compatible with a commercial ultrasonic scanner and to support linear array beamforming as well as phased array beamforming...
May 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28574349/specular-beamforming
#20
Alfonso Rodriguez-Molares, Ali Fatemi, Lasse Lovstakken, Hans Torp
Acoustically hard objects such as bones, needles, or catheters are poorly visualized in conventional ultrasound images. These objects behave like acoustic mirrors and reflect sound in specific directions. Soft tissue and diffusive reflectors scatter sound in a broad range of directions. Conventional delayand- sum (DAS) beamforming is based on the assumption of a purely scattering domain with relatively weak reflectivity. We present an adaptive beamforming technique that takes into account the physics of specular reflection...
May 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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