Journal ArticleDOI
Experimental investigation of finite amplitude distortion-based, second harmonic pulse echo ultrasonic imaging
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TLDR
The computational predictions for the imaging potential of the second harmonic produced by finite amplitude distortion were investigated with a simple experiment and it is suggested that the simple one-pulse scheme may be adequate for second harmonic imaging.Abstract:
The computational predictions for the imaging potential of the second harmonic produced by finite amplitude distortion were investigated with a simple experiment. A focused transducer containing concentric 2.5 MHz and 5.0 MHz elements was used to obtain a sequence of radio-frequency (r-f) backscattered signals using a tissue equivalent phantom. The 2.5 MHz element was used as the transmitter and the 5.0 MHz element was used as the receiver. At 0.68 cm in front of the geometric focal point of the transducer, the phantom contained a 0.6 cm diameter cylindrical volume which contained no scatterers. Each of these r-f signals was then processed to produce the corresponding fundamental (2.5 MHz-centered) and second harmonic (5.0 MHz-centered) envelopes. The contrast resolution obtained for the scatterer-free or cyst region of the envelopes was compared against the computed prediction and good agreement was obtained. The results of this experiment also suggest that the simple one-pulse scheme may be adequate for second harmonic imaging.read more
Citations
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Journal ArticleDOI
Modeling of nonlinear ultrasound propagation in tissue from array transducers
TL;DR: A computationally efficient model capable of simulating finite-amplitude ultrasound beam propagation in water and in tissue from phased linear arrays and other transducers of arbitrary quasiplanar geometry is described, based on a second-order operator splitting approach.
Journal ArticleDOI
Sources of image degradation in fundamental and harmonic ultrasound imaging using nonlinear, full-wave simulations
TL;DR: A full-wave equation that describes nonlinear propagation in a heterogeneous attenuating medium is solved numerically with finite differences in the time domain (FDTD) to simulate propagation of a diagnostic ultrasound pulse through a measured representation of the human abdomen with heterogeneities in speed of sound, attenuation, density, and nonlinearity.
Journal ArticleDOI
Improved synthetic aperture focusing technique with applications in high-frequency ultrasound imaging
TL;DR: An adaptive weighting technique based on a focusing-quality index is introduced to suppress the sidelobes in high-frequency ultrasonic imaging and clearly demonstrates the effectiveness in sidelobe reduction and background-noise suppression for both imaging modes.
Journal ArticleDOI
Erratum: Sources of image degradation in fundamental and harmonic ultrasound imaging: a nonlinear, full-wave, simulation study [Apr 11 754-765]
TL;DR: An earlier revision of this paper was mistakenly submitted for publication as the final draft Unfortunately, this was not discovered until after it appeared in print [1] The correct version of the paper is presented here.
Journal ArticleDOI
Building three-dimensional images using a time-reversal chaotic cavity
TL;DR: This article proposes a different concept allowing us to obtain electronic 3-D focusing with a small number of transducers, and demonstrated using a prototype relying only 31 emission transducers and a single reception transducer.
References
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Journal ArticleDOI
Finite amplitude distortion-based inhomogeneous pulse echo ultrasonic imaging
TL;DR: A novel pulse echo imaging scheme in which the image is formed using the finite amplitude distortion components of the received pulse is considered here, and the resulting potential of these higher harmonics to improve image resolution is investigated.
Journal ArticleDOI
Nonlinear propagation applied to the improvement of resolution in diagnostic medical ultrasound
TL;DR: This work demonstrates the feasibility of nonlinear harmonic imaging in medical scanners using a simple broadband imaging arrangement in water using a 2.25-MHz circular transducer, membrane hydrophone, and polymer lens with a focal length of 262 mm.
Journal ArticleDOI
New approaches to nonlinear diffractive field propagation
TL;DR: A novel model that incrementally propagates the field of baffled planar sources with substeps that account for the physics of diffraction, attenuation, and nonlinearity is presented and yields a computationally efficient procedure for calculating beam patterns from a baffledPlanar, axially symmetric source under conditions ranging from quasilinear through shock.
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New ultrasound contrast agents and technological innovations.
Nico de Jong,Folkert J. ten Cate +1 more
TL;DR: This paper reviews contrast agents developed in the last decade, which are all based on free gas or encapsulated gas bubbles, and recommends three new contrast agents based on ultrasound specific contrast agents.
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Second harmonic characteristics of the ultrasound contrast agents albunex and FSO69
TL;DR: Techniques necessary for measurement of the second harmonic of the insonifying frequency backscattered from ultrasonic contrast agents are described, and this characteristic for the agents Albunex and FSO69 is determined.