Showing papers in "Ultrasonics in 2010"

TL;DR: In this paper, the authors quantitatively describe two different methods to compensate for the temperature effect, namely optimal baseline selection (OBS) and baseline signal stretch (BSS), and investigate the effect of temperature separation between baseline time traces in OBS and the parameters used in the BSS method.

TL;DR: The clear and reproducible delineation of microstreaming patterns based on driving frequency makes frequency-based pattern alternation a feasible alternative to the clinically less desirable practice of increasing sound pressure for equivalent sonoporative or sonothrombolytic effect.

TL;DR: This paper investigates ultrasonic transcutaneous energy transfer as a method for energizing implanted devices at power level up to a few 100 mW by proposing a continuous wave 673 kHz single frequency operation to power devices implanted up to 40 mm deep subcutaneously.

TL;DR: The current technical and clinical status of MRI-guided focused ultrasound therapy is reviewed and future research and development opportunities are discussed.

TL;DR: Pressure and power transfer measurements within a test tank further confirm the effectiveness of the proposed UTET, which showed a peak power transfer efficiency of 39.1% at a power level of 100 mW.

TL;DR: It is demonstrated here that by rapidly switching back and forth between half and quarter wavelength frequencies - mode-switching - a new agglomeration position is established that permits beads to be brought to any arbitrary point between thehalf and quarter-wave nodes.

TL;DR: This study demonstrates that large macromolecules, up to 2 MDa in size, can be delivered with high efficiency to cells which undergo reversible permeabilisation, maintaining long-term viability in approximately half of the cells.

TL;DR: The time domain topological gradient has recently been presented as a promising technique for imaging of complex structures showing results obtained on simulated data, showing the efficiency of the method even in complex configuration such that composite material testing.

TL;DR: The PMN-PT single crystal ultrasonic transducer shows considerably improved performance in sensitivity over the PzT and PZT-based 1-3 composite ultrasonic Transducers.

TL;DR: The problem of designing an imaging system array with large apertures and a very limited number of active elements using the Fermat spiral layout has been studied and a general discussion about the most interesting cases is presented.

TL;DR: The development and validation of an innovative, robust, stable, reliable and efficient ultrasonic system at pilot scale to assist supercritical CO(2) extraction of oils from different substrates is presented.

TL;DR: The revised fundamental analyses trying to elucidate the mechanism of the interactions between the ultrasound and electrical fields, are focused on test electrochemical processes, on the use of unconventional solvents and combination with other techniques.

TL;DR: The evaluation of Olive wood elastic properties has been performed in the low frequency range where the Lamb length wave is large in comparison with the heterogeneity extent, and the obtained elastic tensor doesn't reveal a large deviation from a uniaxial symmetry.

TL;DR: From simulation and in vitro studies, the C THI-PI outperforms the CTHi-BF and CTHI-PM methods in terms of the PRSL, e.g., -43.5dB vs. -24.8dB and -23.0dB, respectively.

TL;DR: The transition strain was shown to be a pressure independent parameter that can be clinically relevant and noninvasively measured using ultrasound-based motion estimation techniques and can assess the stress-strain relationship of the aortic wall locally in vivo and quantify important parameters for the detection and characterization of vascular disease.

TL;DR: In this article, a method that combines transmission of air-coupled ultrasound pulses through solid plates and amplitude and phase spectral analysis is presented to determine the velocity and attenuation coefficient of the ultrasound in the material and the thickness of the plate.

TL;DR: This study shows that imaging the electromechanical function of the heart noninvasively is feasible and electromechanical wave imaging may constitute a unique noninvasive method for conduction wave mapping of the entire left ventricle.

TL;DR: This paper analyzes how ultrasound contrast agent clusters are formed in a capillary and what happens to the clusters if sonication is continued, using continuous driving frequencies in the range 1-10 MHz and shows high-speed camera footage of microbubble clustering phenomena.

TL;DR: It was found that for aqueous extraction the main factors affecting the ultrasonically-assisted process were: granulometry, raw matter/solvent ratio and extraction time.

TL;DR: Investigation of the acceleration efficiency of ultrasound during dyeing process in an ultrasound cleaner showed ultrasound pretreatment could improve slightly the dye exhaustion and fixation, but failed to improve fastness of dyed fabrics.

TL;DR: The main ideas and applications behind transverse oscillation images (TO), specific radiofrequency ultrasound images featuring oscillations in both spatial directions, are reviewed, showing how it can improve motion estimation.

TL;DR: An approach for investigating the ambient pressure sensitivity of a contrast agent using diagnostic ultrasound using SonoVue and the relation between the energy of the subharmonic and the fundamental component was chosen as a measure over theSubharmonic peak amplitude to make the estimates more robust.

TL;DR: The controlled drug release from liposomes by HIFU may be proven to be a potential useful modality for clinical applications.

TL;DR: The analytical solutions are obtained for the dispersion relations of Love wave propagating in a piezoelectric half-space of polarized ceramics carrying a functionally graded material (FGM) layer with initial stress for both electrical open case and electrical short case, respectively.

TL;DR: For certain bi-magnetoelectric material, the interfacial shear waves may do not exist for a perfect interface and exist only for an imperfect interface, and these findings are useful for the design of high-frequency wave devices.

TL;DR: The attempt here is to unify the various treatments of radiation force on a cylinder with arbitrary radius and provide a formulation suitable for any axisymmetric incident wave.

TL;DR: These feasibility studies demonstrate that the dual-mode transducers had imaging performance that was sufficient to aid the guidance and monitoring of treatment, and could sustain high intensities to induce coagulation necrosis in vivo.

TL;DR: This work exploits acoustic radiation forces' simultaneous positioning capability to pre-align particles along the centerline of channels, so that they can successively be removed by means of an external tool for further analysis.

TL;DR: The purpose of the present work is to study the effect of the imperfect interface on SH wave propagating in a cylindrical piezoelectric sensor and the dispersion relations of SH wave are derived analytically and the phase velocity obtained numerically.

TL;DR: It was found that an efficient and stable gene expression for more than two weeks was obtained when tendons were injected with 10 microg of plasmid in the presence of 5x10 BR14 microbubbles with the following acoustic parameters.