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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 269 out of 330
| Title |
The urological applications of focused ultrasound surgery. |
| Author |
Watkin NA, Ter Haar GR, Morris SB, Woodhouse CR. |
| Journal |
Br J Urol |
| Volume |
|
| Year |
1995 |
| Abstract |
No abstract available. |
| Title |
The use of acoustic microscopy for biological tissue characterization. |
| Author |
Kolosov OV, Levin VM, Mayev RG, Senjushkina TA. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1987 |
| Abstract |
A system of transmission raster acoustic microscope with an ultrasound frequency of 450 MHz has been designed to investigate biological tissues and comparative analysis of their optical and acoustic images. The possibility of obtaining the contrast acoustic images of nonfixed, nonstained biological tissues and viscoelasticity measurements in microscale was demonstrated. |
| Title |
The use of acoustic streaming in breast lesion diagnosis: A clinical study. |
| Author |
Nightingale KR, Kornguth PJ, Trahey GE. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1999 |
| Abstract |
Results from a clinical study are presented, in which ultrasonically-induced acoustic streaming was successfully used to differentiate fluid-filled-lesions (cysts) from solid lesions in the breast. In this study, high-intensity ultrasound pulses from a modified commercial scanner were used to.induce acoustic streaming in cyst fluid, and this motion was detected using Doppler methods. Acoustic streaming was generated and detected in 14 of 15 simple cysts, and 4 of 14 sonographically indeterminate breast lesions. This lesion differentiation method appears to be particularly suited for diagnosis of small, possibly newer, cysts that appear indeterminate on conventional sonography due to their size. The results indicate that this method would be a useful adjunct to conventional sonography for the purpose of breast lesion classification. |
| Title |
The use of beta-thromboglobulin to detect platelet damage by therapeutic ultrasound in vivo. |
| Author |
Williams AR, Chater BV, Allen KA, Sanderson JH. |
| Journal |
J Clin Ultrasound |
| Volume |
|
| Year |
1981 |
| Abstract |
Three sequential blood samples were drawn from arms of adult human volunteers by means of a cannula technique, and the plasma levels of beta-thromboglobulin (beta-TG an index of platelet damage) were measured. Ultrasound (0.75 MHz,.continuous wave; spatially averaged intensity 0.34 to 0.5 W/cm-2) was applied to the blood vessels while the second sample of each series was being taken. No elevation of beta-TG was detected, indicating that under these conditions ultrasonic.irradiation had not damaged an appreciable number of platelets. There was, however, an indication of decreased platelet sensitivity following insonation; and it is postulated that this may be the result of either increased production or secretion of the potent endothelial platelet inhibitor, prostacyclin, or both. |
| Title |
The use of diagnostic ultrasound in eye research. |
| Author |
Sokollu A. |
| Journal |
Diagn Ultrasound |
| Volume |
|
| Year |
1966 |
| Abstract |
No abstract available. |
| Title |
The use of frequency mixing to distinguish size distributions of gas-filled micropores. |
| Author |
Quain RM, Waag RC, Miller MW. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1991 |
| Abstract |
The presence of difference frequencies produced by frequency mixing from the nonlinear resonance of gas bodies has been employed to detect gas in porous hydrophobic membranes and to distinguish between gas bodies in the membranes with pore sizes. Calculations based on measured pore sizes were used to predict.the range of frequencies over which resonance may be expected and also to predict that the two different nominal pore sizes in this study would have distinguishable resonance characteristics. Measurements of porous and nonporous membrane scattering characteristics before and after membrane pressurization and.measurements of receiver linearity indicate that resonance of the gas bodies in the membranes is the origin of the observed difference-frequency amplitudes. Difference-frequency amplitudes in the spectra of signals scattered from the membranes with smaller pores are found to peak at excitation frequencies higher than difference-frequency amplitudes produced by membranes with larger pores and generally follow the predictions of the calculations. The results show that a two-frequency mixing technique is capable of detecting and distinguishing sizes of gas bodies that may exist in vivo and serve as cavitation nuclei. |
| Title |
The use of high intensity ultrasound in experimental neurology. |
| Author |
Wall PD, Tucker D, Fry FJ, Mosberg WH Jr. |
| Journal |
J Acoust Soc Am |
| Volume |
|
| Year |
1953 |
| Abstract |
The results of a histological study of the changes produced by high intensity ultrasound on tissue of the central nervous system are presented. The study was restricted to the nontemperature effects of the sound since these are of particular significance for neurology. The results obtained show that nerve cell bodies are particularly sensitive to the action of the ultrasound, while blood vessels and nerve fibers are much more resistant. The use of a focused beam of ultrasound to produce discrete lesions deep in the brain without disturbance of the vascular system or through-going nerve tracts in the region of the lesion is demonstrated by a study on the bulboreticular inhibitor formation of the cat medulla. Physical factors which require consideration are discussed in terms of the histological work. |
| Title |
The use of high-intensity ultrasound to alter the cellular structure of the anterior pituitary. |
| Author |
Krumins R, Kelly-Fry E, Fry FJ, Fry WJ. |
| Journal |
BookChap |
| Volume |
|
| Year |
1965 |
| Abstract |
No abstract available. |
| Title |
The use of reverberation decay method to measure the absorption of ultrasound by tissue. |
| Author |
Glenn WE, Rabinowitz JR. |
| Journal |
Tissue Char Symp |
| Volume |
|
| Year |
unknown |
| Abstract |
No abstract available. |
| Title |
The use of ultrasound in neurosurgery. |
| Author |
Fry WJ, Fry FJ, Meyers R, Eggleton RC. |
| Journal |
Proc Third Int Conf Med Electron - London |
| Volume |
|
| Year |
1960 |
| Abstract |
The use of accurately focused ultrasound at high amplitude levels to modify, either permanently or temporarily, arrays of sites in deep brain structures in the experimental animal and in the human is discussed. The types of selective lesion arrays that can be attained for basic research in neuroanatomy, neurophysiology and behaviour are described, and some representative examples are illustrated. The spectrum of human neurological disorders which has so far received attention in the medical application of this method is indicated, and the modifications of symptoms realized up to the present are briefly outlined. Procedures preparatory to irradiation and pertinent information concerned with the determination and control of the acoustic parameters of exposure, auxiliary factors including tissue temperature and absorption in intervening tissue are considered. Design features of the instrumentation including the various types of transducers employed for producing the focal beams, stereotactic apparatus for supporting the skull, X-ray equipment for landmark determination, calibration instruments for measurement of acoustic field parameters and distributions, and equipment for control of the physical parameters which determine the level and biological effects of the radiation (e.g., heat exchangers, electronic regulating comparators, digital timers, etc.) are briefly described. |
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