Results 201 to 210 of about 514,588 (251)
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Ultrasound in Medicine & Biology, 1991
A newly developed scanning acoustic microscope (SAM) system operating in the frequency range of 100-200 MHz has been employed to measure the attenuation and the sound speed of formalin-fixed specimens of five different types of gastric cancer. Signet-ring cell carcinoma specimens exhibit attenuation constant and sound speed values significantly lower ...
Y, Saijo, M, Tanaka, H, Okawai, F, Dunn
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A newly developed scanning acoustic microscope (SAM) system operating in the frequency range of 100-200 MHz has been employed to measure the attenuation and the sound speed of formalin-fixed specimens of five different types of gastric cancer. Signet-ring cell carcinoma specimens exhibit attenuation constant and sound speed values significantly lower ...
Y, Saijo, M, Tanaka, H, Okawai, F, Dunn
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International Endodontic Journal, 1995
SummaryThe purpose of this pilot study was to investigate some of the clinical variables in ultrasonic endodontics. Forty extracted human teeth with a single, straight root 21–25 mm in length were prepared using combinations of the following variables: hand or ultrasonic instrumentation; apical seat prepared to file sizes 35, 40, 45 or 50; lml of water,
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SummaryThe purpose of this pilot study was to investigate some of the clinical variables in ultrasonic endodontics. Forty extracted human teeth with a single, straight root 21–25 mm in length were prepared using combinations of the following variables: hand or ultrasonic instrumentation; apical seat prepared to file sizes 35, 40, 45 or 50; lml of water,
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Interaction of a scanning laser-generated ultrasonic line source with a surface-breaking flaw
The Journal of the Acoustical Society of America, 2003The scanning laser source (SLS) technique has been proposed recently as an effective way to investigate small surface-breaking cracks. By monitoring the amplitude and frequency changes of the ultrasound generated as the SLS scans over a defect, the SLS technique has provided enhanced signal-to-noise performance compared to the traditional pitch–catch ...
Younghoon, Sohn, Sridhar, Krishnaswamy
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The Accuracy of Porcine Pregnancy Diagnosis by a Newly Developed Ultrasonic A-Scan Tester
British Veterinary Journal, 1976The accuracy of porcine pregnancy diagnosis by a newly developed ultrasonic A-scan tester (developed by Medimatic A/S) is reported. A test to control the accuracy of the equipment showed that 63 observations were correctly designated as pregnant 30-50 days after the last breeding and 31 observations were correctly designated nonpregnant.
L H, Hansen, I J, Christiansen
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A Scanning System for the Measurement of Beam Profiles of Ultrasonic Therapeutic Transducers
The Journal of the Acoustical Society of America, 1973A system for measurement of the intensity distribution across the beams of ultrasonic therapeutic transducers is described. The system consists of a mechanical positioner, a small receiving hydrophone, electronic signal processing circuitry, and an X - Y plotter.
Jerry Harris, Harold F. Stewart
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[Results of A-scan ultrasonic scanning of the orbit (author's transl)].
Klinische Monatsblatter fur Augenheilkunde, 1976119 patients who were believed to suffer from orbital tumors were investigated by A-scan ultrasonic studies. 67 turned out to have significant signs of an orbital tumor, 52 were found to be unsuspicious. In all of the 32 surgical procedures, which were additionally performed, the ultrasonic diagnosis could always be verified.
B, Schwab, A, Nover
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Oral Surgery, Oral Medicine, Oral Pathology, 1982
Abstract Endosonic and conventional hand-filing techniques were compared, by means of scanning electron microscopy, for their ability to debride root canal walls. The endosonic ultrasonic system was found to be significantly superior.
W T, Cunningham, H, Martin
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Abstract Endosonic and conventional hand-filing techniques were compared, by means of scanning electron microscopy, for their ability to debride root canal walls. The endosonic ultrasonic system was found to be significantly superior.
W T, Cunningham, H, Martin
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International Symposium for Testing and Failure Analysis, 1996
Abstract The major interest presented by a Scanning Acoustic Microscope (SAM) for microassembling technologies is to characterize system integrity without alteration in internal structures of the different samples. But ultrasonic waves nature, propagation diversity and spatial resolution obtained close to optical one, induce instructive ...
L. Bechou +4 more
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Abstract The major interest presented by a Scanning Acoustic Microscope (SAM) for microassembling technologies is to characterize system integrity without alteration in internal structures of the different samples. But ultrasonic waves nature, propagation diversity and spatial resolution obtained close to optical one, induce instructive ...
L. Bechou +4 more
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Detection of fetal life and growth by means of ultrasonic A-scan.
Acta chirurgica Academiae Scientiarum Hungaricae, 1977The results achieved in obstetrics by the application of ultrasonic A-scan technique are described. By means of the method fetal life and, from the rate of growth of the biparietal diameter, fetal development were determined in normal and pathological pregnancies.
B, Szöke, D, Kiss
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