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

This quantity comprises the court cases of the 6th foreign 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 way of the addition of the be aware "Imaging", reflecting a rise in emphasis on nonholographic equipment of acoustical visualization. For comfort, no switch has been made within the name of this released sequence. The 38 papers offered right here outline the state of the art within the swiftly constructing box of acoustical holography and imaging. lots of them describe functions in such fields as scientific diagnostics, microscopy, nondestructive trying out, underwater viewing, and seismology. The Editor acknowledges the diligent efforts of the authors in advancing the expertise of Acoustical Imaging and thank you them for getting ready and filing descriptions in their paintings. The papers have been chosen with the capable suggestions of this system Committee that con­ sisted of P.S. eco-friendly, Stanford learn Institute; J.F. Havlice, Stanford Microwave Laboratory; B.P. Hildebrand, Battelle Northwest; D.R. Holbrooke, kid's health facility of San Francisco; P.N. Keating, Bendix study Laboratories; A. Korpel, Zenith Radio company; B.J. McKinley, Lawrence Livermore Laboratory; A.F. Metherell, collage of Miami; J. Powers, Naval Postgraduate tuition; and F.L. Thurstone, Duke college. The Editor appreciates assistance from the consultation chairmen: D.R. Holbrooke, kid's sanatorium 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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Extra info for Acoustical Holography: Volume 6

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The fat structure can be complicated, consisting both of peritoneal and properitoneal fat of changing dimensions and position. Imaging through fatty tissue with a throughtransmission system is by no means trivial and may be the single most important subject dependent problem. CLINICAL RESULTS The clinical investigation involves a series of experiments including imaging of animal organs, normal and THROUGH-TRANSMISSION ACOUSTICAL HOLOGRAPHY (a) FAT ON SOURCE SIDE OF TEST OBJECT (b) FAT ON DETECTOR SIDE OF TEST OBJECT Fi gure 11.

R. ERIKSON ET AL. 48 lengths of the object and reference beam since the coherence length of the laser is only a few centimeters. This did not prove to be a ciritical adjustment. The reference beam passes through an optical phase modulator (discussed below), a spatial filter, a collimator lens and then passes through a prism which deflects the light to an angle of 30 degrees at the film plane. This rather large reference beam angle was needed so that another lens could be placed in the object beam immediately in front of the film.

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. 28 These are the three balloons of Figure 8 focused in three different planes. The minimum edge thickness is presumably the median plane of the balloons where they are in best focus (Figure 9a). Slightly out of focus balloons tend to have thicker edges {Figure 9b). If we focus far enough behind the balloon, a virtual line image of the acoustic source appears (Figure 9c).

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