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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 323 out of 330
| Title |
Ultrasound: a new immunosuppressant. |
| Author |
Anderson DW, Barrett JT. |
| Journal |
Clin Immunol Immunopathol |
| Volume |
|
| Year |
1979 |
| Abstract |
No abstract available. |
| Title |
Ultrasound: Analysis and experimental methods in biological research. |
| Author |
Fry WJ, Dunn F. |
| Journal |
Phys Tech Biol Res |
| Volume |
|
| Year |
1962 |
| Abstract |
No abstract available. |
| Title |
Ultrasound: certain considerations of equipment usage. |
| Author |
James AE Jr, Fleischer AC, Jones T, Powis R, Baker D, Taylor KJW, Coddard J, Price RR. |
| Journal |
The Physical Basis Med Iamging |
| Volume |
|
| Year |
1981 |
| Abstract |
No abstract available. |
| Title |
Ultrasound: Its application in medicine and biology. Chapter V. |
| Author |
O'Brien WD Jr |
| Journal |
Book Chapter |
| Volume |
|
| Year |
1978 |
| Abstract |
No abstract available. |
| Title |
Ultrasound: Its roles in basic and applied neurologic and psychologic research. |
| Author |
Fry WJ. |
| Journal |
Gen Semantics Bull |
| Volume |
|
| Year |
1959 |
| Abstract |
No abstract available. |
| Title |
Ultrasound: synergistic effects and application in cancer therapy by hyperthermia. |
| Author |
Lele PP. |
| Journal |
Ultrasound |
| Volume |
|
| Year |
1987 |
| Abstract |
No abstract available. |
| Title |
Ultrasound‐induced transcutaneous transport for drug delivery and diagnostics. |
| Author |
Kost J, Mitragotri S, Langer R. |
| Journal |
J Acoust Soc Am |
| Volume |
|
| Year |
1998 |
| Abstract |
In spite of major research and development efforts in transdermal systems and the many advantages of the transdermal route, impermeability of the human skin is still a major problem that limits the usefulness of the transdermal drug delivery approach. Application of ultrasound induces temporary structural changes in the skin resulting in enhanced transdermal transport of molecules (sonophoresis). Experimental findings suggest that among all the ultrasound‐related phenomena evaluated, cavitation plays the dominant role in sonophoresis, suggesting that application of low‐frequency ultrasound should enhance transdermal transport more effectively. It was found that at the low ultrasound frequencies high molecular weight molecules including insulin, interferon, and erythropoietin can be transported through the skin. Recently it was shown that the enhanced skin permeability during sonophoresis also facilitates outward diffusion of glucose present in the interstitial fluids beneath the skin. The in vitro as well as in vivo experiments show that the amounts of glucose extracted by sonophoresis are proportional to the blood glucose concentrations. Furthermore, the amount of glucose extracted by ultrasound can be measured and used to predict temporal changes in the blood glucose levels. These results demonstrate the feasibility of developing a noninvasive method of drug delivery and diagnostics using ultrasound. |
| Title |
Ultrasounic nakagami imaging: A strategy to visualize the scatterer properties of benign and malignment breast tumors. |
| Author |
Tsui P,Yeh C, Liao Y, Chang C, Kuo W,Chang K,Chen C. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
2010 |
| Abstract |
Previous studies have demonstrated the usefulness of the Nakagami parameter in characterizing breast tumors by ultrasound. However, physicians or radiologists may need imaging tools in a clinical setting to visually identify the properties of breast tumors. This study proposed the ultrasonic Nakagami image to visualize the scatterer properties of breast tumors and then explored its clinical performance in classifying benign and malignant tumors. Raw data of ultrasonic backscattered signals were collected from 100 patients (50 benign and 50 malignant cases) using a commercial ultrasound scanner with a 7.5 MHz linear array transducer. The backscattered signals were used to form the B-scan and the Nakagami images of breast tumors. For each tumor, the average Nakagami parameter was calculated from the pixel values in the region-of-interest in the Nakagami image. The receiver operating characteristic (ROC) curve was used to evaluate the clinical performance of the Nakagami image. The results showed that the Nakagami image shadings in benign tumors were different from those in malignant cases. The average Nakagami parameters for benign and malignant tumors were 0.69 +/- 0.12 and 0.55 +/- 0.12, respectively. This means that the backscattered signals received from malignant tumors tend to be more pre-Rayleigh distributed than those from benign tumors, corresponding to a more complex scatterer arrangement or composition. The ROC analysis showed that the area under the ROC curve was 0.81 +/- 0.04 and the diagnostic accuracy was 82%, sensitivity was 92% and specificity was 72%. The results showed that the Nakagami image is useful to distinguishing between benign and malignant breast tumors. ©2010 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved. |
| Title |
Ultrastructural changes in the mouse uterus brought about by ultrasonic irradiation at therapeutic intensities in standing wave fields. |
| Author |
ter Haar G, Dyson M, Smith SP. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1979 |
| Abstract |
No abstract available |
| Title |
Ultrsound-induced gas release from contrast agent microbubbles. |
| Author |
Postema M,Bouakaz A,de Jong N. |
| Journal |
IEEE Trans UFFC |
| Volume |
|
| Year |
2005 |
| Abstract |
We investigated gas release from two hard-shelled ultrasound contrast agents by subjecting them to high-mechanical index (MI) ultrasound and simultaneously capturing high-speed photographs. At an insonifying frequency of 1.7 MHz, a larger percentage of contrast bubbles is seen to crack than at 0.5 MHz. Most of the released gas bubbles have equilibrium diameters between 1.25 and 1.75 μm. Their disappearance was observed optically. Free gas bubbles have equilibrium diameters smaller than the bubbles from which they have been released. Coalescence may account for the long dissolution times acoustically observed and published in previous studies. After sonic cracking, the cracked bubbles stay acoustically active. |
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