Abstract：
BACKGROUND:Ultrasound tissue harmonic signal generally provides superior image quality as compared to the linear signal. However, since the generation of the tissue harmonic signal is based on finite amplitude distortion of the propagating waveform, the penetration and the sensitivity in tissue harmonic imaging are markedly limited because of the low signal-to-noise ratio (SNR). METHODS:The method of third harmonic (3f(0)) transmit phasing can improve the tissue harmonic SNR by transmitting at both the fundamental (2.25MHz) and the 3f(0) (6.75MHz) frequencies to achieve mutual enhancement between the frequency-sum and the frequency-difference components of the second harmonic signal. To further increase the SNR without excessive transmit pressure, coded excitation can be incorporated in 3f(0) transmit phasing to boost the tissue harmonic generation. RESULTS:Our analyses indicate that the phase-encoded Golay excitation is suitable in 3f(0) transmit phasing due to its superior transmit bandwidth efficiency. The resultant frequency-sum and frequency-difference components of tissue harmonic signal can be simultaneously Golay-encoded for SNR improvement. The increase of the main-lobe signal with the Golay excitation in 3f(0) transmit phasing are consistent between the tissue harmonic measurements and the simulations. B-mode images of the speckle generating phantom also demonstrate the increases of tissue harmonic SNR for about 11dB without noticeable compression artifacts. CONCLUSION:For tissue harmonic imaging in combination with the 3f(0) transmit phasing method, the Golay excitation can provide further SNR improvement. Meanwhile, the axial resolution can be effectively restored by pulse compression while the lateral resolution remains unchanged.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Shen CC,Shi TYdoi
10.1016/j.ultras.2010.12.008subject
Has Abstractpub_date
2011-07-01 00:00:00pages
554-60issue
5eissn
0041-624Xissn
1874-9968pii
S0041-624X(10)00194-0journal_volume
51pub_type
杂志文章相关文献
ULTRASONICS文献大全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
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.02.012
更新日期：2017-05-01 00:00:00
abstract：:We developed SH (shear horizontal) surface acoustic wave (SAW) sensors to detect protein molecules in liquid solutions applying a particular antibody thin film on the delay line of transverse SAW devices. The antibody investigated was human-immuno-globulin G (HigG) to hold the antigens (anti-HigG) in the protein solut...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.01.039
更新日期：2004-04-01 00:00:00
abstract：:The layer-multiple-scattering method is developed to study wave propagation through two-dimensional lattices of cylindrical inclusions in an elastic medium. The lattices are a series of periodically spaced infinite one-dimensional periodic gratings (or rows) of inclusions. The layer-multiple-scattering method allows t...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.09.002
更新日期：2006-12-01 00:00:00
abstract：:Investigation was carried out to study the effects of maximum aggregate size (MAS) (12.5mm, 19.0mm, 25.0mm, 37.5mm, and 50.0mm) on ultrasonic pulse velocity (UPV) of concrete. For investigation, first class bricks were collected and broken to make coarse aggregate. The aggregates were tested for specific gravity, abso...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.04.006
更新日期：2016-07-01 00:00:00
abstract：:We study thickness-shear vibration of a quartz plate connected to two piezoelectric ceramic plates with initial deformations caused by a biasing electric field. The theory for small deformations superposed on finite biasing deformations in an electroelastic body is used. It is shown that the resonant frequencies of th...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2010.07.002
更新日期：2011-02-01 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
pub_type： 杂志文章
doi：10.1016/s0041-624x(99)00114-6
更新日期：2000-03-01 00:00:00
abstract：:Lactic acid, psychrophilic, and mesophilic bacteria, Escherichia coli, Salmonella spp. and Staphylococcus aureus were enumerated on chicken breasts after treatment with different high intensity ultrasound (frequency 40 kHz, intensity 9.6 W/cm-2) application times (0, 30, and 50 min) and packaging atmospheres (aerobic ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.01.001
更新日期：2020-03-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.10.007
更新日期：2015-02-01 00:00:00
abstract：:The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine the effect of wood ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2010.10.001
更新日期：2011-04-01 00:00:00
abstract：:Ultrasonic non-destructive testing of polycrystalline structures can be disturbed by scattering at grain boundaries. Understanding and modeling this so-called "structural noise" is crucial for characterization as well as detection purposes. Structural noise can be considered as a fingerprint of the material under inve...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.06.012
更新日期：2014-01-01 00:00:00
abstract：:The aim of this work is to investigate the absolute phase information in resonance acoustic scattering by spheres and cylinders and place this work in the broader context of scattering in which the properties of the magnitude and (processed) phase have been examined in a more general way than in the classical resonanc...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2008.01.002
更新日期：2008-07-01 00:00:00
abstract：:This paper describes ultrasonic measurements of normal and tangential stiffnesses of the contacting interface between polished aluminum blocks subjected to nominal contact pressures up to about 3.8 MPa. These stiffnesses were evaluated by ultrasonic spectroscopy methods for the bulk (longitudinal and transverse) wave ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2007.08.005
更新日期：2007-12-01 00:00:00
abstract：:The propagation of ultrasound through an austenitic weld is investigated experimentally as well as in a numerical simulation. The weld is insonified at normal incidence to the fusion line with a longitudinal contact transducer. In order to experimentally trace the ultrasound through the weld, slices of different thick...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(99)00103-1
更新日期：2000-03-01 00:00:00
abstract：:The properties of optical to acoustic transduction of semiconductor superlattices have been explored for several years in the sub terahertz frequency range. Using femtosecond laser pulses focused on these structures, acoustic modes are excited with a frequency related to the periodicity of the structure stacking. We h...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.07.009
更新日期：2015-02-01 00:00:00
abstract：:Ultrasonics is an important diagnostic tool for bone diseases, as it allows for non-invasive assessment of bone tissue quality through mass density-elasticity relationships. The latter are, however, quite complex for fluid-filled porous media, which motivates us to develop a rigorous multiscale poromicrodynamics appro...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.12.005
更新日期：2014-07-01 00:00:00
abstract：:Electromagnetic-acoustic transducers (EMATs) consist of a magnet and a coil. They are advantageous in some non-destructive evaluation (NDE) applications because no direct contact with the specimen is needed to send and receive ultrasonic waves. However, EMATs commonly require excitation peak powers greater than 1kW an...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.02.009
更新日期：2017-07-01 00:00:00
abstract：:Although, high resolution, real-time ultrasonic (US) imaging is routinely available, image interpretation is based on grey-level and texture and quantitative evaluation is limited. Other potentially useful diagnostic information from US echoes may include modifications in tissue acoustic parameters (speed, attenuation...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.09.002
更新日期：2005-03-01 00:00:00
abstract：:This paper describes a completely non-contact ultrasonic method of gas flow metering using air-coupled leaky Lamb waves. To show proof of principle, a simplified representation of gas flow in a duct, comprising two separated thin isotropic plates with a gas flowing between them, has been modelled and investigated expe...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.04.008
更新日期：2018-09-01 00:00:00
abstract：:Ultrasonic standing wave chambers with acoustic pathlengths of 1.1 and 0.62 mm have been constructed. The chambers were driven at frequencies over the range 0.66-12.2 MHz. The behaviour of 2 microns diameter latex microparticles and 5 microns diameter yeast in the chambers has been elucidated. One (flow) chamber had a...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(98)00019-5
更新日期：1998-08-01 00:00:00
abstract：:Acoustic wave interaction with non-bonded contacts was found to be inherently non-linear due to asymmetrical stiffness distribution across the interface. A diode-type non-linearity results in local static elastic fields inside the contact, which are shown to be a source of transient longitudinal and shear DC-acoustic ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(02)00241-x
更新日期：2002-05-01 00:00:00
abstract：:The attenuation of ultrasound in homogenates of bovine skeletal muscle and suspensions of myofibrils was measured over the frequency range 1.5-7 MHz, and found to be proportional to protein concentration in both. In the homogenates it varied with frequency and temperature in a similar way to the attenuation in post ri...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(88)90071-6
更新日期：1988-07-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.09.009
更新日期：2019-02-01 00:00:00
abstract：:The conventional acoustic nonlinear technique to evaluate the contact acoustic nonlinearity (CAN) at solid-solid contact interfaces (e.g., closed cracks), which uses the through-transmission of normally incident bulk waves, is limited in that access to both the inner and outer surfaces of structures for attaching puls...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2012.02.008
更新日期：2012-08-01 00:00:00
abstract：:We demonstrate a new method for a real-time imaging of surface acoustic waves at frequencies up to 1 GHz with picosecond temporal and micron spatial resolutions using an ultrafast optical pump and probe technique combined with a common path interferometer. Using samples with isotropic or anisotropic substrates coated ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(02)00090-2
更新日期：2002-05-01 00:00:00
abstract：:We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450kHz to 1250kHz, which corresponds to...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.03.003
更新日期：2017-07-01 00:00:00
abstract：:A circular cylindrical piezoelectric transducer with radial polarization is proposed. The axial vibration characteristics of the transducer are studied by three different methods: analytical calculation, FEM simulation and experiment. The symmetric and asymmetric excitation conditions are discussed in the Haskins and ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2009.09.008
更新日期：2010-03-01 00:00:00
abstract：:It has been suggested that viscous losses, caused by the motion of myofibrils relative to their environmental fluid, could be the major cause of ultrasound attenuation in muscle. This Paper presents theoretical and experimental estimates of the viscous component of attenuation in suspensions of myofibrils. Experimenta...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(88)90046-7
更新日期：1988-01-01 00:00:00
abstract：:The correlation between ultrasonic wave propagation and polycrystalline microstructures has significant implications in nondestructive evaluation. An original numerical approach using the finite element method to quantify in both time and frequency domains the ultrasonic noise scattering due to the elastic heterogenei...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.02.008
更新日期：2018-07-01 00:00:00
abstract：:We report on the 3-D modelling of periodic arrays of capacitive micromachined ultrasonic transducers (cMUTs) operating in fluid. Specific developments have been performed to model biperiodic transducer arrays and to take into account radiation into any stratified media at the front-side as well as the back-side of the...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.09.006
更新日期：2005-05-01 00:00:00
abstract：:An inversion algorithm (termed AEDep) is proposed for estimating the depth of acoustic emission (AE) sources in plate-like structural components. The work is motivated by the need for characterizing early-stage fatigue crack growth in such components. The algorithm achieves depth estimation by automatically extracting...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2019.105975
更新日期：2019-11-01 00:00:00
