By Adnan Sokollu Sc.D. (auth.), A. F. Metherell (eds.)
This quantity offers the court cases of the 3rd overseas Symposium on Acoustical Holography, which was once held on the Newporter resort, Newport seashore, on 29-31 July 1970. The symposium was once backed by means of the Douglas complex study Laboratories, McDonnell Douglas company, and the Acoustical Society of the US. Twenty papers have been offered and those each one seem as a bankruptcy during this quantity. The chapters are grouped into 5 sections. The sections are I clinical and Biolog ical, II Bragg Imaging, III Nondestructive trying out, IV Underwater and lengthy Wavelength, and V idea and techniques. The reader is counseled basically to take advantage of the sec tional titles as a coarse consultant. for example, the reader attracted to new tools aren't simply learn part V considering the fact that he'll discover a new liquid floor reduction technique de scribed in bankruptcy lOin part III. so that it will lessen the time hold up among the assembly and the ebook date, the publishers have seasoned duced this quantity utilizing the shoot-from-manuscript technique rather than the mote time eating typesetting procedure that used to be used at the prior volumes. therefore there's ameliorations in notation and definitions used for one bankruptcy to a different. notwithstanding this could no longer reason con fusion considering that all symbols and definitions are said in each one bankruptcy. The editor needs to thank the consultation chairmen, Dr. Vincent Salmon, Stanford examine Institute; Dr. Isadore Rudnick, collage of California at la; Dr. Lewis Larmore, McDonnell Douglas company; Dr.
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Extra info for Acoustical Holography: Volume 3 Proceedings of the Third International Symposium on Acoustical Holography, held at the Newporter Inn, Newport Beach, California, July 29–31, 1970
Since the image-forming light in a Bragg system is frequency-shifted from the incident light by an amount equal to the acoustic frequency, some signal-to-noise advantage can be gained by using heterodyne detection with subsequent bandpass filtering. This method also offers the possibility of detecting acoustic phase information from the image and displaying it on a color-television monitor. Some preliminary experiments will be described in which the feasibility of optical heterodyne Bragg imaging is tested.
IN the spo\ dwell tirrfe and N the number of resolvable el~ments. lr4. 1 =NA1) = q . 81T 2 2 b P1 or (ll) is the power of the incident light and 1- Comparing the static and dynamic method we see that their relative performance is determined by the factors q, band P. With 9 = 45 the following relations may be derived fJr the peak perturbation(7) 0 , b stat = V 2v w s and 2 (1 1 r s )~ (12) A. KORPEl AND L. W. KESSLER 30 b I 2 s --(-) w Vp s = dyn i (13 ) where V is the sound velocity in the liquid, I the intensity in the acoustic reference beam, I that in th€ acoustic signal beam, y the surface tension, the density of the liquid and w the sound frequency in radians/se~.
Many of the organs mentioned above are large compared to sound wave lengths. The following dimensions are approximate and vary with the size of the patient and the presence of disease: Aorta - 3 cm in diameter Prostate - 4 x 2 X 3, about 24 grams Gastrointestinal tract - from 3 to 10 cm in diameter Ovary - 4 x 2 x 1 Vertebra - from approximately 1 x 1 x 1 to 7 x 7 x 5 cm Pancreas - up to 15 cm long and weighing between 15 and 90 grams Kidney - 12 x 6 x 3, approximately 100 grams ACOUSTICAL IMAGING IN MEDICINE 21 Uterus - from 7 x 5 x 2 to 20 x 30 x40 cm Ventricles of the brain - approximately 2 x 1 x 10 cm Thyroid - approximately 5 x 3 x 2 ern, 30 grams Gallbladder - lOx 2 x 2 cm Liver - 20x lOx 15 cm, up to 1500 grams It would be desirable to be able to outline an organ with a certainty of ± 1 to 5% of its size, this would be satisfactory for a start.
Acoustical Holography: Volume 3 Proceedings of the Third International Symposium on Acoustical Holography, held at the Newporter Inn, Newport Beach, California, July 29–31, 1970 by Adnan Sokollu Sc.D. (auth.), A. F. Metherell (eds.)
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