Bioacoustics Research Lab
University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
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William D. O'Brien, Jr. publications:

Michael L. Oelze publications:

Aiguo Han publications:

BRL Abstracts Database

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Your search for ultrasound produced 3296 results.

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Title Proton-transfer reactions. A mechanism for the absorption of ultrasound in aqueous solutions of proteins.
Author Hussey M, Edmonds PD.
Journal J Phys Chem
Volume
Year 1971
Abstract This paper presents a first-order method of calculating the excess ultrasonic absorption due to proton-transfer reactions for solutions of proteins and polypeptides. The calculated results for three proteins - bovine serum albumin, human hemoglobin, and gelatin - and two polypeptides - polylysine and polyglutamic acid - are plotted and are shown to resemble qualitatively the experimental data from other authors. It is concluded that this mechanism is appreciable in the ranges pH < 6 and pH > 8. However, the calculation does need refinement, and some ways to do so are recommended.


Title Prototype of a new 3D ultrasound computer tomography system: transducer design and data recording.
Author Stotzka R, Widman H, Muller T, Holubek KS, Gemmeke H, Ruiter N, Gobel G.
Journal Ultrason Imaging
Volume
Year 2004
Abstract Ultrasound computer tomography is an imaging method capable of producing volume images with both high spatial and temporal resolution. The promising results of a 2D experimental setup of an ultrasound computer tomography system with at least 0.25 mm resolution encouraged us to build a new 3D demonstration system. It consists of three parts: a tank containing the sensor system, a data acquisition hardware and a computer workstation for image reconstruction and visualization. For the sensor system we developed and manufactured our own low-cost transducer array emitting or receiving ultrasound signals in three dimensions. To optimize the transducer geometry in respect to aperture angle and pressure amplitude the pressure field was simulated using the ultrasound simulation program Field II. Each transducer arrays system carries 8 emitting and 32 receiving elements with integrated amplifier and address electronics. 192 A-scans can be recorded in parallel by the data acquisition hardware. 48 multiplexing steps are needed to store all A-scans of the 1536 receiving transducers. After recording the data is transmitted to the computer workstation.


Title Pseudocolor B-mode arterial images to quantify-echogenicity of atherosclerotic plaque.
Author Beach KW, Primozich JF, Strandness DE Jr.
Journal Ultrasound Med Biol
Volume
Year 1994
Abstract Based on the differences between tissue impedances in atherosclerotic plaques and on the scattering of ultrasound from blood, colors were assigned to the echo strength scale, replacing the usual gray scale in 2-D B-mode ultrasound images. Using a "green tag" indicating -55 dB to mark blood, other echo strength values from atherosclerotic plaque were assigned specific colors, creating a B-mode color ultrasound display that highlights selected echogenicities. The color scale permits the use of a wider dynamic range in the B-mode image, and allows the instrument gains to be set reproducibly.


Title Pseudocolor displays in B-mode imaging applied to echocardiography and vascular imaging: An update.
Author Comess KA, Beach KW, Hatsukami T, Strandness DE Jr, Daniel W.
Journal J Am Soc Echocardiogr
Volume
Year 1992
Abstract Cardiac and vascular ultrasound systems incorporting colorized gray-scale display options to supplement the standard B-mode gray-scale image have recently reappeared on the market from several manufacturers. As yet, the clinical benefit of this "new" technology is unknown, and recommendations and protocols for its best application are not available. This article reviews the limitations of the gray-scale displays currently used, the rationale of the color-supplemented B-mode image, and some of the potential applications to cardiac and vascular ultrasound.


Title PSpice modelling of ultrasound transducers: Comparison of software models to experiment.
Author Maione E, Tortoli P, Lypacewicz G, Nowicki A, Reid JM.
Journal IEEE Trans UFFC
Volume
Year 1999
Abstract This paper presents a complete PSpice model of an ultrasound single-element transducer, including electrical and mechanical matching as well as the focusing lens. By using this model, it is possible to obtain a relation between the electrical driving source and the acoustic velocity on the transducer surface. This boundary condition then allows the acoustic field to be calculated by numerical methods. Experimental data obtained with two different transducers are in good agreement with results predicted by the related models.


Title Pulse average versus maximum intensity.
Author Carstensen EL, Berg RB, Child SZ.
Journal Ultrasound Med Biol
Volume
Year 1983
Abstract No abstract available.


Title Pulse average versus maximum intensity.
Author Carstensen EL, Berg RB, Child SZ.
Journal Ultrasound Med Biol
Volume
Year 1983
Abstract Letter to the editor.


Title Pulse echo ultrasound imaging systems: Performance tests and criteria.
Author Carson PL, Zagzebski JA.
Journal Rep AAPM
Volume
Year 1980
Abstract No abstract available.


Title Pulse-echo field distribution measurement technique for high-frequency ultrasound sources.
Author Raum K, O'Brien WD Jr.
Journal IEEE Trans UFFC
Volume
Year 1997
Abstract A simple technique for the determination of the spatial and temporal transmit-receive field distributions of spherically focused high-frequency transducers is described. Instead of a point-like target, tungsten wires (line-like targets) with diameters less than the acoustic wavelength are used as pulse-echo targets. Spatial and temporal field quantities were determined for spherically focused transducers in the frequency range from 3 to 17 MHz, and a comparison with hydrophone measurements showed that both techniques yielded comparable results for the low-frequency transducer. However, for the higher frequency transducers, hydrophone measurements did not yield satisfactory results compared to the wire-target technique due to the hydrophone's aperture size, while the results from the wire-target technique were in general agreement with theory.


Title Pulse-echo imaging using a nondiffracting beam transducer.
Author Lu J-Y, Greenleaf JF.
Journal Ultrasound Med Biol
Volume
Year 1991
Abstract Conventional ultrasonic transducers generate beams that diffract as they travel. This phenomenon causes images produced in B-mode to be degraded in the far-field of the transducers. Focused transducers are used to improve image quality. Unfortunately, focused transducers have short depth of field. Although multiple pulse transmissions focused at several depths are used to increase the effective depth of field, imaging frame rate is reduced dramatically leading to blurred images of moving objects such as the heart. We present a family of transducers that produce nondiffracting beams of large depth of field. Therefore, uniformly high resolution throughout the imaging area can be obtained without sacrificing the imaging frame rate. In addition, the nondiffracting property of these beams makes the correction for beam diffraction negligible in tissue characterization. This paper reports the results of computer simulations as well as in vitro and in vivo pulse-echo imaging experiments with a nondiffracting transducer. Images are compared to those obtained by conventional focused Gaussian shaded beam transducers and a commercial ACUSON 128 B-scanner. The new transducer has much longer depth of field with higher sidelobes than conventional transducers of the same aperture. Sidelobes can be reduced using the new transducer to transmit and the dynamically focused transducer to receive.


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