Bioacoustics Research Lab
University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
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Your search for ultrasound produced 3296 results.

Page 249 out of 330

Title The antivascular action of physiotherapy ultrasound on murine tumors.
Author Wood AKW, Ansaloni S, Ziemer LS, Lee WMF, Feldman MD, Sehgal CM.
Journal Ultrasound Med Biol
Volume
Year 2005
Abstract This study was aimed at determining if physiotherapy ultrasound (US) affected the fragile and leaky angiogenic blood vessels in a tumor. In 22 C3HV/HeN mice, a subcutaneous melanoma (K173522) was insonated (1,2 or 3 min) with continuous 1-MHz low-intensity (spatial-average temporal-average = 2.28 W cm-2), physiotherapy US. Contrast-enhanced (0.1 mL Optison) power Doppler US observations were made and histogram analyses of the images were performed. Before insonation, all but 7 % of the tumor was perfused. The avascular area in tumors receiving 3-min treatment increased to 82% (p < 0.001). A linear regression analysis showed that each min of insonation led to a 25% reduction in tumor vascularity; the antivascular activity persisted for 24 h. Histology demonstrated disruption of vascular walls and tumor cell death in areas of vascular congestion and thrombosis. Physiotherapy US particularly targeted the vascular structures, and the effects on tumor cells appeared to be secondary to the resultant ischemia.


Title The application of a fractal model to the scattering of ultrasound in biological media.
Author Javanaud C.
Journal J Acoust Soc Am
Volume
Year 1989
Abstract The implications of a fractal model of medium structure for the angular dependence of the ultrasonic differential scattering cross section and for the frequency dependence of the total ultrasonic scattering cross section are explored. The results for the differential scattering cross section agree well with published experimental values for liver and those for the total scattering cross section are not inconsistent with the literature data.


Title The application of transducer arrays in ultrasound computerized tomography.
Author Hiller D, Ermert H.
Journal Proc Ultrason Int Conf
Volume
Year 1979
Abstract A system for Ultrasound Computerized Tomography is investigated, which uses linear transducer arrays instead of a mechanically scanned pair of focused transducers. Such an array based system is able to work in a very fast manner. The results of some experiments, carried out on waterimmersed sponge phantoms are reported.


Title The application of ultrasound in labyrinthine disturbances.
Author Kossoff G.
Journal Proc IREE Aust
Volume
Year 1964
Abstract Vertigo and other labyrinthine disturbances have been successfully treated by ultrasonic irradiation. Some of the audiometric tests being used in diagnosing these conditions are described. The initial Italian generator and its performance are analysed. The acoustic and electric design of the Commonwealth Acoustic Laboratories (C.A.L.) transistorised ultrasonic generator and focused probe is outlined. The method employed in measuring the ultrasonic power output and the clinical results obtained are discussed.


Title The application of ultrasound locating techniques to opthalmology. Part I. Theoretical considerations and acoustic properties of ocular media.
Author Baum GB, Greenwood I.
Journal Rep Natl Inst Health
Volume
Year unknown (late 50's)
Abstract This manuscript is presented in an incomplete form to enable the review committee to evaluate the work of the project when deciding upon its continuation. Certain aspects of the reflection data are under further study and may require the addition of a correction factor. Current studies imply that the tissues of the eye are affected by the osmotic pressure of the solution in which they are immersed and that after a period of immersion their acoustic impedances show measurable changes. Experiments are currently in progress to substantiate or refute this observation. If this observation should be substantiated one may expect some minor errors in predicting tissue interface reflections on the basis of measurements made on isolated tissues. This phenomena might permit one to study osmotic and diffusion processes in the intact eye. The absorption data is accurate because the energy loss due to reflection is too small to be significant in these measurements. Obviously, certain corrections may have to be made in the final text, based on the findings of the corrected data.


Title The atenuation of ultrasound in biological fluids.
Author Narayana PA, Ophir J,Maklad NF.
Journal J Acoust Soc Am
Volume
Year 1984
Abstract We have measured the ultrasonic attenuation parameters alpha o and n of several biological fluids in vitro in the frequency range 2.8-6.8 MHz, using frequency shift and/or a sinc (.) sidelobe ratio technique. The parameters αo and n describe the frequency-dependent attenuation via a power-law model, i.e.,α(f)=αofn, where f is frequency. The samples investigated were blood, pus, cyst fluid, bile, and infected hematoma. It was found that the values of αo span approximately the range between 0.03-0.3 dB cm-1MHz-n, and values of n range from about 1.1-1.3.


Title The attenuation of ultrasound in dilute polymeric fiber suspensions.
Author Habeger CC.
Journal J Acoust Soc Am
Volume
Year 1982
Abstract Experimental data for the attenuation of ultrasound by dilute fiber suspensions are presented. Measurements are taken from 0.6 to 10 MHz using rayon, polyester, and nylon fibers with radii in the 7- to 120-?m range. A theory of attenuation due to isolated, infinite, cylindrical inclusions in a fluid is developed. Theory and experiment are found to be in good agreement.


Title The benefit of ultrasound imaging in evaluation of the breast: review of a 3-year clinical program.
Author Harper AP, Kelly-Fry E.
Journal J Indiana State Med Assoc
Volume
Year 1981
Abstract no abstract avoidable.


Title The biochemistry of the inner ear and the consequences of treatment by ultrasound.
Author Hughes DE, Chou JT.
Journal Acta Otolaryngol
Volume
Year No date available.
Abstract No abstract available.


Title The biological effects of ultrasound.
Author Stratmeyer ME, Christman CL.
Journal Women Health
Volume
Year 1982
Abstract In summary, there are many deficiencies and gaps in the current data base for ultrasound-induced bioeffects. More information is needed on the effects of low intensity ultrasound, the effects of pulsed ultrasound, the relationship between.peak intensities and average intensities of pulsed ultrasound, the possibility of cumulative effects, and the possibility of long-term effects. Also, very little of the data, either positive or negative, has been verified by other laboratories. Although.there is presently no evidence to indicate that diagnostic ultrasound involves a significant risk, the evidence is insufficient to justify an unqualified acceptance of safety. The potential for acute adverse effects has not been systematically explored, and the potential for delayed effects has been virtually ignored. Because of the difficulties involved in searching for and defining potential risks from exposure to low levels of chemicals, radiation, or other forms of energy, it is unreasonable to expect that in the near future, the degree of risk, if any, will be clearly defined for diagnostic ultrasound. As in other areas (e.g., the effects of ionizing radiation) no single study, epidemiological or experimental, can accomplish this goal. In the meantime, a prudent public health policy calls for judicious use of diagnostic ultrasound, using it only when diagnostic benefits to patients are indicated, and keeping any exposure to diagnostic ultrasound as low as practicable, consistent with its intended purpose.


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