Bioacoustics Research Lab
University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
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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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