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BRL Abstracts Database |
Your search for ultrasound produced 3296 results. Page 252 out of 330
Title |
The diagnostic application of ultrasound to the disease in mediastinal organs. Third Report: The ultrasonocardiotomography in living human subjects. |
Author |
Tanaka M, Oka S, Ebina T, Kosaka S, Terasawa Y, Unno K, Kikuchi Y, Uchida R, Hagiwara Y. |
Journal |
Sci Rep Res Inst Tohoku Univ Ser C Med |
Volume |
|
Year |
1967 |
Abstract |
No abstract available. |
Title |
The diagnostic application of ultrasound to the disease in mediastinal organs. Ultrasono-tomography for the heart and great vessels (the second report). |
Author |
Ebina T, Kikuchi Y, Oka S, Uchida R, Tanaka M, Hagiwara Y, Kosaka S. |
Journal |
Sci Rep Res Inst Tohoku Univ Ser C Med |
Volume |
|
Year |
1965 |
Abstract |
No abstract available. |
Title |
The diagnostic application of ultrasound to the diseases in mediastinal organs. Ultrasono-tomograpy for the heart and great vessels (the first report). |
Author |
Ebina T, Kikuchi Y, Oka S, Tanaka M, Kosaka S, Uchida R, Hagiwara Y. |
Journal |
Sci Rep Res Inst Tohoku Univ Ser C Med |
Volume |
|
Year |
1965 |
Abstract |
No abstract available. |
Title |
The direct effect of ultrasound upon Wilms' tumor in the rat. |
Author |
Longo FW, Tomashefsky P, Rivin BD, Longo WE, Lattimer JK, Tannenbaum M. |
Journal |
Invest Urol |
Volume |
|
Year |
1976 |
Abstract |
The possible activation of immunologic defenses against tumor by local ultrasonic irradiation was investigated. Sonication of one tumor of a dual implant destroyed that tumor only with no contralateral effect. Injection of tumor cells previously sonicated in vivo did not induced immunity to subsequent challenge with live cells. Immunofluorescent staining of host kidneys for antibody complexes was negative. It was concluded that sonication was only effective when directly applied to the tumor. |
Title |
The direct estimation of sound speed using pulse-echo ultrasound. |
Author |
Anderson ME, Trahey GE. |
Journal |
J Acoust Soc Am |
Volume |
|
Year |
1998 |
Abstract |
A method for the direct estimation of the longitudinal speed of sound in a medium is presented. This estimator derives the speed of sound through analysis of pulse-echo data received across a single transducer array following a single transmission, and is analogous to methods used in exploration seismology. A potential application of this estimator is the dynamic correction of beamforming errors in medical imaging that result from discrepancy between the assumed and actual biological tissue velocities. The theoretical basis of this estimator is described and its function demonstrated in phantom experiments. Using a wire target, sound-speed estimates in water, methanol, ethanol, and n-butanol are compared to published values. Sound-speed estimates in two speckle-generating phantoms are also compared to expected values. The mean relative errors of these estimates are all less than 0.4%, and under the most ideal experimental conditions are less than 0.1%. The relative errors of estimates based on independent regions of speckle-generating phantoms have a standard deviation on the order of 0.5%. Simulation results showing the relative significance of potential sources of estimate error are presented. The impact of sound-speed errors on imaging and the potential of this estimator for phase aberration correction and tissue characterization are also discussed. |
Title |
The disappearance of ultrasound contrast bubbles: Observations of bubble dissolution and cavitation nucleation. |
Author |
Chen WS, Matula TJ, Crum LA. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
2002 |
Abstract |
The destruction process of biSphere? and Optison? ultrasound (US) contrast microbubbles were studied at 1.1 MHz. High-amplitude tone bursts caused shell disruption and/or fragmentation of the microbubbles, leading to dissolution of the freed gas. The bubble destruction and subsequent dissolution process was imaged with a high pulse-repetition frequency (PRF) 10-cycle, 5-MHz bistatic transducer configuration. Three types of dissolution profiles were measured: In one case, biSphere? microbubbles showed evidence of dissolution through resonance, during which a temporary increase in the scattering amplitude was observed. In another case, both biSphere? and Optison? microbubbles showed evidence of fragmentation, during which the scattering amplitude decreased rapidly. Finally, in some cases, we observed the impulsive growth and subsequent rapid decay of signals that appear to be due to cavitation nucleation. Simulations of bubble dissolution curves show good agreement with experiments. |
Title |
The effect of 1 MHz ultrasound on the proliferation of synchronized Chinese hamster V-79 cells. |
Author |
Ciaravino V, Miller MW, Kaufman GE. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1981 |
Abstract |
Mitotically synchronized Chinese hamster V-79 cells were exposed to continuous wave 1 MHz ultrasound at a spatial peak intensity of 3 W/cm(^2) at 37 degrees C. A fraction of the cells was lysed immediately, and a second fraction was rendered nonviable. Many of these intact but nonviable cells appeared to be morphologically damaged. The remaining viable cells formed smaller colonies than did unexposed controls, apparently because of the death of one daughter cell at or shortly after the first division. There were no apparent effects on cells surviving beyond that period, and progression through the cell cycle was unperturbed. |
Title |
The effect of 2 MHz ultrasound irradiation on Pisum sativum roots. |
Author |
Miller MW, Voorhees SM, Carstensen EL, Kaufman GE. |
Journal |
Radiat Res |
Volume |
|
Year |
1976 |
Abstract |
The effect of 2 MHz ultrasound at intensity levels from 2.5 to 22 W/sq cm on the growth rate and mitotic index of Pisum sativum roots was studied. The ultrasound produced an immediate reduction in the growth rate on the first postexposure day, followed by a gradual recovery to the control value. Ultrasound reduced the root meristem mitotic index. Intensity- and time-dependent relations were found for the growth rate and mitotic index reductions. |
Title |
The effect of focused ultrasound on the electrochemical passivity of iron in sulfuric acid. |
Author |
Alkire RC, Perusich S. |
Journal |
Corrosion Sci |
Volume |
|
Year |
1983 |
Abstract |
Focused ultrasound was used to study passivity of pure iron in 2 N H2SO4. Ultrasonic waves were used to depassivate a passive surface film and influence the subsequent repassivation process. A curved piezo-electric transducer produced high frequency (1.58 MHz) ultrasonic waves which created cavitation at the focal point. Acoustic focal intensities up to 3.4 kW/cm2 were generated. Low frequency (20 kHz) ultrasound was produced with a commercial sonicator equipped with an exponential microhorn. At high focal intensities (above 1.5 kW/cm2) a single (100 ms) pulse of ultrasound produced depassivation; at low intensities continuous ultrasonic exposure was required. In all cases, the induced depassivation was followed by precipitation of a metal salt film upon the metal surface before the oxide film formation. |
Title |
The effect of focussed ultrasound on the permeability of frog muscle. |
Author |
Hughes DE, Chou JTY, Warwick R, Pond J. |
Journal |
Biochim Biophys Acta |
Volume |
|
Year |
1963 |
Abstract |
No abstract available. |
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