Sonothrombolysis with magnetic microbubbles under a rotational magnetic field.

abstract：:In the present work a general model of the vibrational behavior of the axle of a piezoelectric motor is proposed. In this motor, a cylinder-shaped permanent magnet, which act as a rotor, is pressed in contact with an end of a steel axle by means of the magnetic forces. The other end of the axle is fitted at the center...

journal_title：Ultrasonics

authors： Iula A,Pappalardo M

更新日期：2004-04-01 00:00:00

abstract：:An ultrasonic technique for imaging nonlinear scatterers, such as partially-closed cracks, buried in a medium has been recently proposed. The method called fundamental wave amplitude difference (FAD) consists of a sequence of acquisitions with different subsets of elements for each line of the image. An image revealin...

journal_title：Ultrasonics

authors： Haupert S,Ohara Y,Carcreff E,Renaud G

更新日期：2019-07-01 00:00:00

abstract：:High-frequency calibration of hydrophones is becoming increasingly important, both for clinical and scientific applications of ultrasound, and user safety. At present, the calibrations available routinely to the user community extend to 60 MHz. However, hydrophones that can measure beyond this are available, and ultra...

journal_title：Ultrasonics

authors： Rajagopal S,Cox BT

更新日期：2020-12-01 00:00:00

abstract：:The design and simulation of power transducers are difficult since piezoelectric, dielectric and elastic properties of ferroelectric materials differ from linear behavior when driven at large levels. This paper is devoted to modeling of a resonant power transducer at a high level of dynamic mechanical stress. The powe...

journal_title：Ultrasonics

authors： Guyomar D,Ducharne B,Sebald G

更新日期：2011-12-01 00:00:00

abstract：:The Total Focusing Method (TFM) yields a focused image in emission and in reception while Phased Array (PA) imaging provides Dynamic Depth Focusing (DDF) in reception only. Besides, most NDE applications have two propagation media, where refraction at the interface complicates time-of-flight (TOF) and focal law comput...

journal_title：Ultrasonics

authors： Cruza JF,Camacho J,Mateos R,Fritsch C

更新日期：2019-11-01 00:00:00

abstract：:Single clouds of cavitation bubbles, driven by 254kHz focused ultrasound at pressure amplitudes in the range of 0.48-1.22MPa, have been observed via high-speed shadowgraphic imaging at 1×10(6) frames per second. Clouds underwent repetitive growth, oscillation and collapse (GOC) cycles, with shock-waves emitted periodi...

journal_title：Ultrasonics

authors： Johnston K,Tapia-Siles C,Gerold B,Postema M,Cochran S,Cuschieri A,Prentice P

更新日期：2014-12-01 00:00:00

abstract：:We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m(2) plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit b...

journal_title：Ultrasonics

authors： Holland SD,Roberts R,Chimenti DE,Song JH

更新日期：2006-12-01 00:00:00

abstract：:Sonothrombolysis is one of the most feasible methods for enhancing clot lysis with a recombinant tissue plasminogen activator (rt-PA) in cases of acute ischemic strokes. For safe and efficient clinical practices of sonothrombolysis, accurate estimation of ultrasound transmittance through the human skull is critical. P...

journal_title：Ultrasonics

authors： Wang Z,Komatsu T,Mitsumura H,Nakata N,Ogawa T,Iguchi Y,Yokoyama M

更新日期：2017-05-01 00:00:00

abstract：:The aim of this work was to show the applicability of light diffraction tomography on airborne ultrasound in the frequency range 40 kHz-2 MHz. Seven different air-coupled transducers were measured to show the method's performance regarding linearity, absolute pressure measurements, phase measurements, frequency respon...

journal_title：Ultrasonics

authors： Almqvist M,Holm A,Persson HW,Lindström K

更新日期：2000-01-01 00:00:00

abstract：:Classically, rotary motors with gears and spindle mechanisms are used to achieve translatory motion. In means of miniaturization and weight reduction piezoelectric linear motors are of interest. Several ultrasonic linear motors found in literature base on the use of two different vibration modes. Most often flexural a...

journal_title：Ultrasonics

authors： Hemsel T,Mracek M,Twiefel J,Vasiljev P

更新日期：2006-12-22 00:00:00

abstract：:The second and third-order Brugger elastic constants are obtained for liquids and ideal gases having an initial hydrostatic pressure p1. For liquids the second-order elastic constants are C₁₁=A+p₁, C₁₂=A-p₁, and the third-order constants are C₁₁₁=-(B+5A+3p₁), C₁₁₂=-(B+A-p₁), and C₁₂₃=A-B-p₁, where A and B are the Beye...

journal_title：Ultrasonics

authors： Cantrell JH

更新日期：2014-07-01 00:00:00

abstract：:Guided waves propagating in cylindrical tubes are frequently applied for the characterization of material or geometrical properties of tubes. In a tube, guided waves can propagate in the axial direction and called axial guided waves, or in the circumferential direction called circumferential guided waves. Dispersion s...

journal_title：Ultrasonics

authors： Yeh CH,Yang CH

更新日期：2011-05-01 00:00:00

abstract：:The aim of this paper is to investigate propagation characteristics and the generation mechanism of the nonlinear lowest-order symmetric Lamb mode (S0) which propagates downslope in free elastic plates with slowly linearly varying-thickness. From theoretical analyses, in a low frequency-thickness product (fd) range, t...

journal_title：Ultrasonics

authors： Hu Z,An Z,Kong Y,Lian G,Wang X

更新日期：2019-04-01 00:00:00

abstract：:Guided modes propagation in intact, fractured and healing long bone has drawn significant research interests. However, mode quantifications for the direct comparison are still necessary to address. The aim of the study is to analyze the mode interaction with a notch-fracture in the long bone and find quantitative ultr...

journal_title：Ultrasonics

authors： Xu K,Liu D,Ta D,Hu B,Wang W

更新日期：2014-07-01 00:00:00

abstract：:Intraluminal (within the alimentary tract) thermal surgery has been shown to be a useful therapeutic option when extracorporeal focused ultrasound applicators cannot be used since their beam may not reach the target site. If plane transducers are used for the treatment of alimentary tract tumours, the applicator must ...

journal_title：Ultrasonics

authors： Melodelima D,Prat F,Birer A,Theillère Y,Cathignol D

更新日期：2004-04-01 00:00:00

abstract：:Traditional rotary corers and sample retrieval mechanisms for planetary drilling suffer from a variety of technical difficulties. A heavy and rigid drillstring must be assembled on-site and deployed with considerable applied preload and torque, and these mechanical loadings are difficult to react in a low gravity envi...

journal_title：Ultrasonics

authors： Harkness P,Lucas M,Cardoni A

更新日期：2011-12-01 00:00:00

abstract：:The dispersion and attenuation features of the multi-physical fields coupled waves propagating in an infinite piezoelectric semiconductor and the reflection problem at a boundary which is mechanically free, electrically insulation and the dielectrically open circuit are studied in this paper. Different from the classi...

journal_title：Ultrasonics

authors： Jiao F,Wei P,Zhou X,Zhou Y

更新日期：2019-02-01 00:00:00

abstract：:During the last decade, the introduction of ultrasound techniques in arc welding with the intention of improving the operational performance and technical characteristics of the welding processes have been studied intensively. In this work is presented a broad review of the literature surrounding the utilization of th...

journal_title：Ultrasonics

authors： da Cunha TV,Bohórquez CE

更新日期：2015-02-01 00:00:00

abstract：:Reflections of 4 MHz ultrasound pulses from 60 sites on 15 human aorta specimens were analysed using the plane-wave Born approximation (PWBA) inverse scattering method. The recovered high-resolution acoustic impedance profile for each site was correlated with an analysis (by microscope) of sections taken from that sit...

journal_title：Ultrasonics

authors： Tobocman W,Santosh K,Carter JR,Haacke EM

更新日期：1995-07-01 00:00:00

abstract：:An improved method for ultrasonic location of multiple flaws using perpendicular ultrasonic arrays, working in near-field conditions, is presented. The method uses the pulse-echo technique and is based on the processing of the information acquired by both the elemental emitting transducers and their adjacent ones. Thi...

journal_title：Ultrasonics

authors： Rodríguez MA,Ramos A,San Emeterio JL

更新日期：2006-12-22 00:00:00

abstract：:The T-matrix approach is used to calculate the scattering of sound waves by an ellipsoidal void in a fluid. Results are presented for the total cross-section of a sphere as a function of frequency; this is related to the detection of the onset of bends in divers. Results are also presented for the angular variation in...

journal_title：Ultrasonics

authors： Cooper G,Temple JA

更新日期：1983-07-01 00:00:00

abstract：:The frequency dependence of H2O2 generation from H2O by a sonochemical reaction was detected experimentally. The results are in good agreement with previous experimental results, which indicate that in sonochemical reactions, frequencies higher than 90 kHz are more effective than frequencies of several tens of kiloher...

journal_title：Ultrasonics

authors： Sato M,Itoh H,Fujii T

更新日期：2000-03-01 00:00:00

abstract：:Our objective was to investigate whether hemorrhage control can be achieved faster when high-intensity focused ultrasound (HIFU) is applied in the presence of ultrasound contrast agents (UCA) as compared to HIFU only application. Incisions (3 cm long and 0.5 cm deep) were produced in the livers of anesthetized rabbits...

journal_title：Ultrasonics

authors： Zderic V,Brayman AA,Sharar SR,Crum LA,Vaezy S

更新日期：2006-12-01 00:00:00

abstract：:Transducer is the necessary and most important part in the maxonics. New applications demand for new transducer, and the renovation of the transducer will open a new field for the application of the maxonics. The important method to develop new transducer is to find and develop new material. The rare earth giant magne...

journal_title：Ultrasonics

authors： Liu W,Zhou L,Xia T,Yu H

更新日期：2006-12-22 00:00:00

abstract：:One of the important issues in the field of ultrasound medical imaging using contrast agents is the development of techniques able to separate the response of the contrast media from that of the biological tissues. In the literature, one can find various solutions involving the use of multiple transmitted signals and ...

journal_title：Ultrasonics

authors： Crocco M,Palmese M,Sciallero C,Trucco A

更新日期：2009-01-01 00:00:00

abstract：:In this paper, the resonance frequency equation and expression of displacement amplitude magnifications of a full-wave barber ultrasonic horn are obtained. By discussing the relationships between the displacement amplitude magnifications and the geometrical dimensions, the optimized design of the horn for the largest ...

journal_title：Ultrasonics

authors： Fu Z,Xian X,Lin S,Wang C,Hu W,Li G

更新日期：2012-07-01 00:00:00

abstract：:The ultrasound-induced harmonic microbubble response spectrum is known to shift to lower frequencies with increasing tissue attenuation. We hypothesized that this shift could be reproducibly detected in received broadband radiofrequency spectra. We used an automatic Gaussian curve-fitting technique to measure the mean...

journal_title：Ultrasonics

authors： Bartleson VB,Viggen K,Asanuma T,Kinnick RR,Belohlavek M

更新日期：2003-03-01 00:00:00

abstract：:In this paper a high intensity focused ultrasound (FUS) phantom model was developed, in order to be used in experiments for Blood Brain Barrier (BBB) disruption. The target was to create a phantom model that represents the disruption of the BBB during ultrasound application. An appropriate experimental setup was creat...

journal_title：Ultrasonics

authors： Alekou T,Giannakou M,Damianou C

更新日期：2021-02-01 00:00:00

abstract：:The main component of every device used for investigating internal object structure by Ultrasound Transmission Tomography (UTT) is a special ultrasonic probe. This paper presents the structure of model multielement ring probe for examining objects using this method in divergent ray projection geometry. The probe is ma...

journal_title：Ultrasonics

authors： Gudra T,Opielinski KJ

更新日期：2006-12-22 00:00:00

abstract：:The acoustic source localization technique for anisotropic plates proposed by the authors in an earlier publication ([1] Kundu et al., 2012) is improved in this paper by adopting some modifications. The improvements are experimentally verified on anisotropic flat and curved composite plates. Difficulties associated wi...

journal_title：Ultrasonics

authors： Nakatani H,Kundu T,Takeda N

更新日期：2014-09-01 00:00:00