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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 314 out of 330
| Title |
Ultrasound interaction with fetal tissues of mouse. |
| Author |
Suneetha N. |
| Journal |
Thesis(PhD): Sri Krishnadevaraya Univ |
| Volume |
|
| Year |
1991 |
| Abstract |
No abstract availble. Have synopsis only. |
| Title |
Ultrasound interactions with biological materials. |
| Author |
Evans JA. |
| Journal |
Thesis(PhD): Univ of Wales |
| Volume |
|
| Year |
1985 |
| Abstract |
No abstract available. |
| Title |
Ultrasound intracavity system for imaging, therapy planning and treatment of focal disease. |
| Author |
Sanghvi NT, Foster RS, Fry FJ, Bihrle R, Hennige C, Hennige LV. |
| Journal |
Proc Ultrason Symp IEEE |
| Volume |
|
| Year |
1992 |
| Abstract |
A new ultrasound system has been developed based on advances in transducer material technology. It permits the same piezoceramic element to be used for conventional pulse echo ultrasound imaging as well as for continuous wave high intensity focused ultrasound for tissue ablation. This intracavity device is presently used for prostate tissue ablation. Ultrasound visualization of the prostate guides the probe placing the ultrasound beam focus in the appropriate tissue region. A large volume tissue ablation of demarcated size is produced by using both the linear and sector motions of the transducer |
| Title |
Ultrasound inverse scattering determination of speed of sound, density, and absorption. |
| Author |
Kwon SJ, Jeong MK. |
| Journal |
Proc IEEE Ultrasonic Symposium |
| Volume |
|
| Year |
1998 |
| Abstract |
This paper presents a method of determining three intrinsic mechanical parameters of an unknown object in the framework of ultrasound inverse scattering tomography. Those parameters are the speed of sound, density, and absorption whose values are given as the solution of an inhomogeneous Helmholtz wave equation. Computer simulations are carried out using the sinc basis moment method and Newton-Raphson method in an measurement configuration where the object is insonified by an incident plane wave over 360° and the scattered field is collected by detectors arranged in a rectangular fashion around it. Two distinct frequencies are used to separate each parameter of three Gaussian objects that are either overlapped at the same location or separately positioned from each other. The density turns out to be rather difficult to reconstruct as compared with the other two parameters. |
| Title |
Ultrasound investigation of human blood coagulation. |
| Author |
Wang J, Feng R, Chen Z. |
| Journal |
Chin Sci Bull |
| Volume |
|
| Year |
1990 |
| Abstract |
The blood coagulation phenomenon has always played an important role in living organisms. The testing of blood coagulation time is an ordinary and useful assistant in clinical diagnosis. As the changes in chemical and physical properties are quite overt during coagulation, a number of devices with mechanical, optical, and other sensors have been developed to record and study the process of blood coagulation. Among them the ultrasonic method has been proposed since the 1960?s. Recently the ultrasonic method was found useful in detecting the intracardiac thrombi and the intracranial hemorrhage of neonates. But to the best of our knowledge, data describing the ultrasonic properties of the blood clot are still very rare although information on these properties is important to refine the technique still further and to ascertain the mechanism responsible for the clinically observed phenomenon. An automatic measuring technique based on the principle of the ultrasonic resonator for testing a small number of samples was used to measure serially and accurately the ultrasound propagation velocity and attenuation in human blood during its coagulation. In this note, some experimental results are presented along with a description of the measurement system. The mechanism responsible for these observations are also discussed. |
| Title |
Ultrasound irradiation effect on embryos. Effect of continuous ultrasound irradiation on pre-implanted rats embryo. |
| Author |
Akamatsu N, Niwa K,Sekiba K,Utsumi K. |
| Journal |
Nippon Cho-ompa Igakkai Koen_Rombunshu |
| Volume |
|
| Year |
1977 |
| Abstract |
Early rat embryos before implantation in the stages of late morula and early blastocyst were exposed to continuous wave 2Mhz ultrasound with the intensity of SATA 1 to 3 W/cm2 for 12h. Significant delay of the development to expanding blastocyst was noted after the exposure to 1W/cm 2 ultrasound. The delay and the cells necrosis were noted in the embryos exposed to 1.8 W/cm2. These changes are mainly due to heating effect of ultrasound.
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| Title |
Ultrasound irradiation effects on pre-implantation embryos. |
| Author |
Akamatsu N. |
| Journal |
Acta Obstet Gynaecol Jpn |
| Volume |
|
| Year |
1981 |
| Abstract |
To elucidate ultrasound irradiation effect on pre-implantation embryos, its mechanism and safety levels of ultrasound intensity, I had performed ultrasound irradiation and thermal experiments on pre-implantation embryos. The pre-implantation embryos, whose stages were late morula on early blastocyst, were located in the centre of ultrasound beam certainly by using closed microdroplet culture. Experiments were done under various conditions of ultrasound intensity, irradiation time and temperature of circumference. .The statistically significant increase of morphological abnormality was observed when 3.0 W/cm(^2) continuous wave for 60 minutes of 0.65, 1.0 or 1.8 W/cm(^2) continuous wave for 720 minutes was irradiated. The statistically significant developmental retardation was observed when 2.0 or 3.0 W/cm(^2) continuous wave for 60 minutes or 0.65, 1.0 or 1.8 W/cm(^2) continuous wave for 720 minutes was irradiated. Pulsed ultrasound irradiated groups showed neither increase of morphological abnormality nor developmental retardation significantly. .The reading of thermistor sonde located in the centre of beam was raised during irradiation. No significant change were observed between warming and irradiated groups, temperature of which were similarly raised. Similar results were seen when 3.0 W/cm(^2) continuous wave for 60 minutes were irradiated during cool circumference, in which temperature of the centre of ultrasound beam didn't raise more than 37 degrees C. .These results suggest that thermal effect of ultrasound is most effective during various effects including cavitation in this study. |
| Title |
Ultrasound irradiation of the hypophysis in disseminated breast cancer. |
| Author |
Hickey RC, Fry WJ, Meyers R, Fry FJ, Bradbury JT, Eggleton RC. |
| Journal |
Am J Roentgenol Radium Ther Nucl Med |
| Volume |
|
| Year |
1963 |
| Abstract |
No abstract available. |
| Title |
Ultrasound lethality to synchronous and asynchronous Chinese hamster V-79 cells. |
| Author |
Fu YK, Miller MW, Lange CS, Griffiths TD, Kaufman GE. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1980 |
| Abstract |
Chinese hamster V-79 cells were exposed in suspensions for 1-15 min to 1.1 MHz continuous wave (CW) ultrasound at axial intensities from 0.25-30 W/cm2. Cell lysis was evidenced by a decrease in the number of intact cells, and loss of reproductive integrity was evidenced by a decrease in the plating efficiency of the remaining intact cells. The magnitude of these effects was a function of both intensity and exposure duration. Mitotically synchronized cells displayed a differential sensitivity depending upon cell cycle position. The M and S phases of the cell cycle were more resistant with respect to cell lysis and loss of reproductive integrity than were the G1 and G2 phases. |
| Title |
Ultrasound mammalian tissue properties literature search. |
| Author |
Goss SA, Johnston RL, Dunn F. |
| Journal |
Acoust Lett |
| Volume |
|
| Year |
1978 |
| Abstract |
No abstract available. |
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