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BRL Abstracts Database |
Your search for ultrasound produced 3296 results. Page 247 out of 330
Title |
Teratologic study of rats exposed to ultrasound. |
Author |
McClain RM, Hoar RM, Saltzman MB. |
Journal |
Am J Obstet Gynecol |
Volume |
|
Year |
1972 |
Abstract |
Pregnant rats were exposed to diagnostic levels of continuous ultrasound (10 ms. per square centimeter, 2.5 MHz) for either 1/2 or 2 hours, on either Days 8, 9, and 10 or 11, 12, and 13 of gestation, the period when most organogenesis occurs. Two control groups were used, one (treated controls) to which an unpowered ultrasonic transducer was applied for the same duration and with identical gestation criteria as those of the test groups and the second (untreated controls) which was not handled. Exposure to ultrasound did not affect litter size or weight. Resorptions in animals treated for one half hour on Days 11, 12, and 13 and for 2 hours on Days 8, 9, and 10 were slightly increased but were not statistically significant at the p 0.02 level. Skeletal variations were slightly but not significantly higher in those animals exposed to ultrasound for 0.5 hour on Days 8, 9, and 10 and 11, 12, and 13 (Groups 1 and 3). No biological significance was attached to these results since there was considerable variation in this parameter among control groups and no increased incidence was observed in animals exposed for 2 hours. No significant soft tissue or skeletal abnormalities were observed in any treatment group. |
Title |
Test for 'miniature flies' following exposure of Drosophila melanogaster larvae to diagnostic levels of ultrasound. |
Author |
Child SZ, Carstensen EL, Davis HT. |
Journal |
Exp Cell Biol |
Volume |
|
Year |
1980 |
Abstract |
An attempt has been made to replicate an experiment which reported the appearance of 'miniature flies' after exposure of Drosophila melanogster larvae to the field of a pulsed diagnostic ultrasound unit. No effects were observed with 1.5 mW temporal average acoustic power, the level of the original report. However, when temporal peak powers were increased by a factor of 10, approximately one fourth of the larvae failed to survive to the imago stage. No miniature flies were seen in the entire study. |
Title |
Test for kidney hemorrhage following exposure to intense, pulsed ultrasound. |
Author |
Carstensen EL, Hartman C, Child SZ, Cox CA, Mayer R, Schenk E. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1990 |
Abstract |
A recent study has found that the threshold for extravasation in mouse kidney tissues by exposure to a spark-generated shock wave is of the order of 3-5 MPa (peak positive pressure). Since the mode pressure used by commercial pulsed Doppler ultrasound units is approximately 5 MPa, it is essential to determine whether these observations are relevant to diagnostic ultrasound. Hence, a comparable study has been completed using the same pathological endpoints but with exposure to pulsed ultrasound (10 microseconds pulse length) at 1.2 MHz and 3.8 MHz in which peak positive pressures exceeded 10 MPa. At these levels the focal waves are in shock because of the nonlinear properties of the propagating medium. The results of the pulsed ultrasound study were negative. Although this finding is encouraging for the use of diagnostic ultrasound, the two studies eventually must be integrated into a single mechanistic picture before the limits of safety will be known. |
Title |
Test for the effects of diagnostic levels of ultrasound on the immune response of mice. |
Author |
Child SZ, Hare JD, Carstensen EL, Vives B, Davis J, Adler A, Davis HT. |
Journal |
Clin Immunol Immunopathol |
Volume |
|
Year |
1981 |
Abstract |
An attempt has been made to replicate an experiment which reported suppression of the immune response of mice after exposure of t he spleen to a pulsed diagnostic ultrasound unit with a temporal average acoustic power of 8 mW. Our tests of both hemagglutinin and hemolysin responses of mice exposed at 8 and 80 mW temporal average powers were not significantly different from controls. |
Title |
Testicular abscess: Diagnosis by ultrasonography. |
Author |
Mevorach RA, Lerner RM, Dvoretsky PM, Rabinowitz R. |
Journal |
J Urol |
Volume |
|
Year |
1986 |
Abstract |
We reviewed 8 cases of surgically proved testicular abscess with emphasis upon the ultrasonographic findings. The images were correlated with testicular anatomy and the pathological findings of abscess formation. In 3 of 8 patients undergoing serial high resolution ultrasound examinations a consistent pattern of testicular abscess was present 1 to 7 weeks preoperatively. In the remaining 5 patients preoperative ultrasound documented the presence of abscess. Recognition of the ultrasonographic appearance of testicular abscess should permit expedient surgical intervention. |
Title |
Testing for the teratogenicity of pulsed ultrasound in mice. |
Author |
Child SZ, Carstensen EL, Gates AH, Hall WJ. |
Journal |
Ultrasound Med Biol |
Volume |
|
Year |
1988 |
Abstract |
Our replicate of a study by Takabayashi et al. (1981) Effects of pulse-wave.ultrasonic irradiation on mouse embryo. Cho-Onpa Igaku (Supersonic Medicine).8, 286-288 failed to show any effects of exposure in utero of mice to spatial.average, temporal maximum intensities of 60 W/cm2. Fetuses were exposed at 8.days post fertilization and assessed at 18 days for fetal weight, resorptions,.premature deaths, and malformations. Carrier frequency in the pulse was 2 MHz..Pulse lengths of 10 microseconds and pulse repetition frequencies of 1000 and.200 Hz yielded spatial average, temporal average intensities of 0.6 and 0.1.W/cm2. Total exposure time was 5 min. Our results provide no basis to conclude.that conditions relevant to human fetal monitoring will cause developmental,.externally visible anomalies in mice exposed as 8-day fetuses. . |
Title |
Tests for direct or indirect mutagenic effect of ultrasound. |
Author |
baker NV, Thacker J. |
Journal |
Genetics |
Volume |
|
Year |
Unknown |
Abstract |
No abstract available. |
Title |
Thaumascan: Clinical cardiac imaging. |
Author |
Kisslo J, von Ramm OT, Thurstone FL. |
Journal |
Proc First Ultrasound Med Conf - Seattle |
Volume |
|
Year |
1974 |
Abstract |
Standard time-motion echocardiographic techniques do not provide adequate details of cardiac spatial geometry. In view of this basic limitation, several real-time two-dimensional ultrasound imaging systems have been developed. This paper outlines a representative application of a multielement array scanner in a clinical environment. |
Title |
Thaumascan: Clinical cardiac imaging. |
Author |
Kisslo J, von Ramm OT, Thurstone FL. |
Journal |
Proc Nineteenth Annu Meet AIUM - Seattle |
Volume |
|
Year |
1974 |
Abstract |
Standard time-motion echocardiographic techniques do not provide adequate details of cardiac spatial geometry. In view of this basic limitation, several real-time two-dimensional ultrasound imaging systems have been developed. This paper outlines a representative application of a multielement array scanner in a clinical environment. |
Title |
Thaumascan: Design considerations and performance characteristics. |
Author |
von Ramm OT, Thurstone FL. |
Journal |
Proc Nineteenth Annu Meet AIUM - Seattle |
Volume |
|
Year |
1974 |
Abstract |
Thaumascan is an acronym for a two-dimensional, high resolution, actual time, ultrasound, multi-element array scanner. This system substantially reduces or overcomes such limitations as low data acquisition rates, low lateral resolution and problems associated with the large dynamic range of echo information typical of most currently available imaging systems. It relies on phased array principles rather than mechanical means to steer the ultrasound beam rapidly through the structures under investigation. |
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