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BRL Abstracts Database |
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Your search for ultrasound produced 3296 results. Page 86 out of 330
| Title |
Diagnostic levels of ultrasound may disrupt myelination. |
| Author |
Ellisman MH, Palmer DE, Andre MP. |
| Journal |
Exp Neurol |
| Volume |
|
| Year |
1987 |
| Abstract |
Neonatal rats 3 to 5 days of age were exposed to the ultrasound beam from a medical ultrasound imaging system. Dorsal nerve roots were examined by electron microscopy. Comparison between exposed and sham-exposed controls revealed.disruption of the nodes of Ranvier attributable to ultrasound. Morphologic changes ranged from vacuole formation in the paranodal region to frank demyelination and were still evident after 24 h of recovery. Rats of this age are at a stage of myelination similar to that of a human fetus 4 to 5 months. The ultrasound intensities used in this study are consistent with those used for human imaging (SPTA 0.135 mW/cm2, SATA 0.045 mW/cm2, SPTP 8.7 W/cm2, SPPA 1.9 W/cm2), but the relevance of these findings to clinical ultrasound will require further study. |
| Title |
Diagnostic spectrum analysis in ophthalmology: A physical perspective. |
| Author |
Feleppa EJ, Lizzi FL, Coleman DJ, Yaremko MM. |
| Journal |
Ultrasound Med Biol |
| Volume |
|
| Year |
1986 |
| Abstract |
No Abstract Available. |
| Title |
Diagnostic ultrasound - is there a hazard? |
| Author |
Unknown |
| Journal |
Biomed Eng |
| Volume |
|
| Year |
1972 |
| Abstract |
No abstract available. |
| Title |
Diagnostic ultrasound and its obstetric applications. |
| Author |
Kremkau FW, Nelson LH. |
| Journal |
Am Fam Physician |
| Volume |
|
| Year |
1978 |
| Abstract |
No abstract available. |
| Title |
Diagnostic ultrasound and sister chromatid exchanges: Failure to reproduce positive findings. |
| Author |
Ciaravino V, Brulfert A, Miller MW, Jacobsen-Kram D, Morgan WF. |
| Journal |
Science |
| Volume |
|
| Year |
1985 |
| Abstract |
Human lymphocytes were exposed in vitro to ultrasound from two clinical devices, one of which was previously reported to have increased the frequency of sister chromatid exchanges. The ultrasonic exposures had no significant effect on the frequency of sister chromatid exchanges from three blood donors. Exposure to ultrasound also had no effect on cell cycle progression. A concomitant positive control (mitomycin C) resulted in a significant increase in sister chromatid exchanges. |
| Title |
Diagnostic ultrasound equipment. |
| Author |
Unknown. |
| Journal |
U S Dept of Health, Edu and Welfare |
| Volume |
|
| Year |
1979 |
| Abstract |
No abstract available. |
| Title |
Diagnostic ultrasound in breast cancer: Analysis of retrotumorous echo patterns correlated with sonic attenuation by cancerous connective tissue. |
| Author |
Kobayashi T. |
| Journal |
J Clin Ultrasound |
| Volume |
|
| Year |
1979 |
| Abstract |
Echographic diagnosis of breast cancer has been used in clinical medicine for the past several years. Echographic findings and characteristics suggesting differentiation between malignant and benign tumors have been reported by various investigators. These signs are analyzed in correlation with histological findings, especially cancerous connective tissue and nonconnective tissue and retrotumorous shadow patterns in clinical echograms of various breast cancers. Special reference is made to ultrasound attentuation related to bioacoustical tissue characteristics. This causal mechanism provides a stepping-stone for further improvements in ultrasound apparatus designed for clinical diagnosis of breast cancer. Furthermore, it may stimulate basic research on the bioacoustical properties of ultrasound reflection, absorption, and velocity. |
| Title |
Diagnostic ultrasound in veterinary practice: How safe is it? |
| Author |
Horder MM, Barnett SB, Edwards MJ. |
| Journal |
Aust Vet J |
| Volume |
|
| Year |
1996 |
| Abstract |
This paper provides information on the safety of ultrasonic diagnostic procedures as currently used in veterinary practice. The known mechanisms of action are described and selected literature on biological effects of ultrasound is reviewed..Current international consensus is presented on the safety of medical ultrasound with respect to thermal effects. To date, there is no independently verified clinical evidence that the level of exposure delivered to the tissues during scanned.grey-scale ('B-mode') imaging has any adverse effects. Lung haemorrhage has been observed in animal experiments using diagnostic exposures, but the effects have not been reported in the foetus. Equipment that uses pulsed Doppler transmits.higher acoustic outputs in a stationary beam, and can produce temperature increases that may have significant biological consequences. When considering sonographic and pulsed Doppler examinations of the prenatal animal, the safety margins are small and the operator should be aware of the acoustic output of the equipment, the exposure time, and the sensitivity of target tissues. . |
| Title |
Diagnostic ultrasound increases sister chromatid exchange; preliminary report. |
| Author |
Ehlinger CA, Katayama KP, Roesler MR, Mattingly RF. |
| Journal |
Wis Med J |
| Volume |
|
| Year |
1981 |
| Abstract |
An increased frequency of sister chromatid exchange was seen in human cells exposed in vivo to diagnostic ultrasound, 5 MHz for 30 minutes (p<0.005). |
| Title |
Diagnostic ultrasound is unable to enhance the rate of neoplastic transformation in cultured mammalian cells. |
| Author |
Tolsma SS, Madsen EL, Chmiel J, Martin AO, Bouck NP. |
| Journal |
J Ultrasound Med |
| Volume |
|
| Year |
1991 |
| Abstract |
The ability of diagnostic pulsed ultrasound to induce heritable genetic damage of the type that could result in neoplasia was assayed using BHK21/cl 13 hamster cells or normal human fibroblasts as targets. Using an exposure apparatus carefully designed to minimize beam attenuation and reflection, cavitation, and heating, cells were exposed from 20 seconds to 40 minutes either to clinical machines operating at maximum power, or to a highly focused nonclinical transducer at 2900 W/cm2, or to 200 shocks from a lithotripter. No evidence of an increase in the frequency of neoplastically transformed BHK cells or in the frequency of mutant human cells was seen over those found in matched sham-exposed controls. |
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