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:

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Your search for ultrasound produced 3296 results.

Page 278 out of 330

Title Tissue characterization of skin utilizing high ultrasonic frequencies.
Author Forster FK, Olerud JE, Gow EL.
Journal Proc Ultrason Symp IEEE
Volume
Year 1983
Abstract Acoustic interrogation of skin involves measurement parameters quite different than those used in other clinical applications of ultrasound. Since the depth of penetration is much less than that needed for most organs in the body, higher frequencies can be used. One application of high-frequency ultrasound in skin is the characterization of healing surgical wounds. This application imposes some constraints on the minimum frequency since the focal region of a transducer beam must be less than the wound width. Our initial work is described which was carried out using pulse excitation of a 30 MHz transducer having a focal diameter of approximately .1 mm. The measurement system developed performs the quantification of acoustic attenuation within a wound as a function of frequency from one-sided measurements. This measurement system is capable of analyzing acoustic signals well in excess of 100 MHz.


Title Tissue characterization wit ultrasound: Vol I methods.
Author Greenleaf JF.
Journal Book Chapter
Volume
Year 1986
Abstract No abstract available.


Title Tissue characterization.
Author Chivers RC.
Journal Ultrasound Med Biol
Volume
Year 1981
Abstract The term "tissue characterization" covers a range of meanings from qualitative assessments to scientific measurements. From the vast literature available the selection presented is used to enlarge the definition of the term, to show the relation of tissue characterization to imaging, to identify some of the relevant physical parameters, to give a brief historical introduction to the subject, and to outline its methodology. The majority fo the references are contained in the last sections which deal with laboratory measurements and in vivo applications.


Title Tissue classification with generalized spectrum parameters.
Author Donohue KD Huang L Burks T Forsberg F Piccoli CW.
Journal Ultrasound Med Biol
Volume
Year 2001
Abstract This paper presents performance comparisons between breast tumor classifiers based on parameters from a conventional texture analysis (CTA) and the generalized spectrum (GS). The computations of GS-based parameters from radiofrequency (RF) ultrasonic scans and their relationship to underlying scatterer properties are described. Clinical experiments demonstrate classifier performances using 22 benign and 24 malignant breast mass regions taken from 40 patients. Linear classifiers based on parameters from the front edge, back edge and interior tumor regions are examined. Results show significantly better performances for GS-based classifiers, with improvements in empirical receiver operating characteristic (ROC) areas of greater than 10%. The ROC curves show GS-based classifiers achieving a 90% sensitivity level at 50% specificity when applied to the back-edge tumor regions, an 80% sensitivity level at 65% specificity when applied to the front-edge tumor regions, and a 100% sensitivity level at 45% specificity when applied to the interior tumor regions.


Title Tissue displacements during acupuncture using ultrasound elastography techniques.
Author Langevin HM, Konofagou EE, Badger GJ, Churchill DL, Fox JR, Ophir J, Garra BS.
Journal Ultrasound Med Biol
Volume
Year 2004
Abstract Acupuncture needle manipulation has been previously shown to result in measurable changes in connective tissue architecture in animal experiments. In this study, we used a novel in vivo ultrasound (US)-based technique to quantify tissue displacement during acupuncture manipulation in humans. B-scan ultrasonic imaging was performed on the thighs of 12 human subjects at different stages of needle motion, including varying amounts of rotation, downward and upward movement performed with a computer-controlled acupuncture needling instrument. Tissue displacements, estimated using cross-correlation techniques, provided successful mapping and quantitative analysis of spatial and temporal tissue behavior during acupuncture needle manipulation. Increasing amounts of rotation had a significant linear effect on tissue displacement during downward and upward needle motion, as well as on rebound tissue displacement after downward needle movement. In addition to being a valuable tool for studies of acupuncture’s mechanism of action, this technique may have applications to other types of needling including biopsies.


Title Tissue harmonic imaging in cardiology and radiology applications.
Author Averkiou MA, jago JR, Roundhill DN, Powers JE.
Journal J Acoust Soc Am
Volume
Year 1998
Abstract Harmonic imaging, the formation of ultrasound images from the harmonic components of the sonification signal, has been used in diagnostic ultrasound applications that utilize microbubble contrast agents. In the presence of microbubbles the harmonic signals are mainly due to nonlinear bubble oscillations. Recently, harmonic imaging has been applied without contrast agents, the harmonic signals arising from nonlinear propagation. Near‐field artifacts and aberrations are reduced, and tissue borders are enhanced. The harmonic signals are at a lower amplitude and suffer more attenuation than the fundamental. However, the wide dynamic range, digital architecture, and signal processing capabilities of modern diagnostic ultrasound systems make it possible to utilize this tissue‐generated harmonic energy for image formation. The nonlinear parabolic wave equation is used to model tissue propagation. A time domain numerical solution for a nonaxisymmetric source function is presented. Theory and experiments demonstrate harmonic generation in tissues. In vitro animal tissue experiments and in vivo collected radio frequency data are shown. A novel broadband pulsing scheme that uses two pulses with a phase difference of 180° is introduced, which results in cancellation of the propagated fundamental component and doubling of the second harmonic. Cardiac and abdominal harmonic images are shown.


Title Tissue heating effect of pulsed Doppler ultrasound in the live fetal lamb.brain.
Author Stone PR, Ross I, Pringle K, Flower J.
Journal Fetal Diagn Ther
Volume
Year 1992
Abstract A series of experiments in fetal lambs investigated the heating effects of pulsed Doppler ultrasound on fetal brain tissue. In dead lamb brain, tissue heating was observed at the skull bone-to-brain interface. Minimal or no temperature rise was.found in the live lamb, suggesting that the intact circulation conducts away any potential heating. The choice of animal model and the state of the circulation influence the results obtained. This will of course have implications for clinical practice. .


Title Tissue identification by ultrasound.
Author Le Croissette DH.
Journal Rep Univ Calif Inst Technol
Volume
Year 1977
Abstract No abstract available. Third quarterly report.


Title Tissue information from ultrasound scattering.
Author Leeman S, Jones JP.
Journal Proc Thirteenth Int Symp Acoust Imaging - Minneapolis
Volume
Year 1983
Abstract No abstract available.


Title Tissue macrostructure determination with swept-frequency ultrasound.
Author Waag RC, Lerner RM.
Journal Proc Ultrason Symp IEEE
Volume
Year 1973
Abstract A general analysis is provided showing how ultrasound may be used to determine the acoustic structure of tissue on a scale corresponding to the wavelengths employed. The results indicate that, since the scattered signal amplitude as a function of frequency is related to the Fourier transform of the acoustic impedance variations, the scattered signal may be processed to yield structure information. The data, although similar to that obtained by angle scanning at a fixed frequency in x-ray diffraction, is obtainable without angle scanning. Therefore, frequency scanning appears more readily applicable for diagnostic purposes in patients. Two cases are treated. One is for regular periodic structures in which point reflectors are represented as impulsive impedance discontinuities and yield well-known Bragg diffraction effects. The other is for a random variation in acoustic impedance in which the structure information is obtained as an impedance correlation function. The frequency scanning results are identical with those for angle scanning when the medium is statistically isotropic. Instrumentation capable of measuring scattered signal intensity as a function of frequency and range has been assembled. Test data obtained with this apparatus demonstrates diffraction effects from thin slabs and the frequency dependence of power spectrum on particle size of random scatterers. The data also illustrates the problems and promise of the method.


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