By J. R. Suarez, K. W. Marich, J. F. Holzemer, J. Taenzer (auth.), Newell Booth (eds.)

ISBN-10: 1461582164

ISBN-13: 9781461582168

ISBN-10: 1461582180

ISBN-13: 9781461582182

This quantity comprises the court cases of the 6th overseas Symposium on Acoustical Holography and Imaging, held in San Diego, California, February 4-7, 1975. The identify of this symposium differs from that of the 1st 4 by means of the addition of the note "Imaging", reflecting a rise in emphasis on nonholographic equipment of acoustical visualization. For comfort, no swap has been made within the name of this released sequence. The 38 papers awarded right here outline the cutting-edge within the quickly constructing box of acoustical holography and imaging. lots of them describe purposes in such fields as clinical diagnostics, microscopy, nondestructive checking out, underwater viewing, and seismology. The Editor acknowledges the diligent efforts of the authors in advancing the know-how of Acoustical Imaging and thank you them for getting ready and filing descriptions in their paintings. The papers have been chosen with the capable information of this system Committee that con­ sisted of P.S. eco-friendly, Stanford study Institute; J.F. Havlice, Stanford Microwave Laboratory; B.P. Hildebrand, Battelle Northwest; D.R. Holbrooke, kid's health center of San Francisco; P.N. Keating, Bendix examine Laboratories; A. Korpel, Zenith Radio company; B.J. McKinley, Lawrence Livermore Laboratory; A.F. Metherell, collage of Miami; J. Powers, Naval Postgraduate institution; and F.L. Thurstone, Duke collage. The Editor appreciates assistance from the consultation chairmen: D.R. Holbrooke, kid's clinic of San Francisco; Mahfuz Ahmed, Zenith Radio company; R.K. Mueller, collage of Minnesota; G. Wade, collage of California at Santa Barbara; B.P.

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0 EXPERIMENTAl POINTS _ _ CAlCUlATED FROM CRITICAl _ ANGlE REFlECTION ONlY _ _ CALCULATED FROM REFRACTED SOUND MISSING DETECTOR I 1400 1500 1600 1700 1900 2000 2100 2200 2300 2400 VELOCITY OF SOUND IN CYLINDER, m/sec Figure 8. Edge Thickness Data 2500 - I I 1800 - 2600 2700 2800 K. R. ERIKSON ET AL. 26 (a) (b) (c) Figure 9. Effects Of Refracting Media 27 THROUGH-TRANSMISSION ACOUSTICAL HOLOGRAPHY (a) IN FOCUS (c) B-SCAN IMAGE (b) OUT-OF-FOCUS Figure 10. Excised Fat Layer K. R. ERIKSON ET AL.

Green, editor, Plenum Press, 1974. 4. Green, editor, Plenum Press, 1974. 5. Leach, "On Assessment of Risk to Ultrasound," Proc. IEEE Symp. Sonics Ultrasonics, pp 486-490, 1972. 6. W. Pub. (FDA) 73-8008 BRH/DBE 73-1; pp 203-205, September 1972. 7. Fry, "Ultrasonic Threshold Dosages for the Mammalian Central Nervous System," IEEE Trans. Biomed. , BME-18, 253-256, 1971. 8. Jones, "Ultrasound in Medicine-A Review," IEEE Trans. 3, pp 144-170, July 1974. 9. Ossoining, editors, pp 21-27, 1971, Vienna Academy of Medicine.

Tl) J. •• #""' • .... (,},·~ ...... , 6 (a) (b) Figure 18. Defocused Version Of Figure 17 39 40 K. R. ERIKSON ET AL. We have often found that by defocusing the image slightly we can smooth out the background noise and improve our ability to identify structure. Figure 18 is a defocused version of Figure 17 which the reader may find helpful. THE PLACE OF ACOUSTICAL HOLOGRAPHY IN MEDICAL IMAGING After being intimately involved with an acoustical holography system in the clinic for over a year now and having imaged a wide variety of subjects, both medical and engineering in nature, we have arrived at some personal opinions regarding the place of acoustical holography in medical imaging.

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Acoustical Holography: Volume 6 by J. R. Suarez, K. W. Marich, J. F. Holzemer, J. Taenzer (auth.), Newell Booth (eds.)

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