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 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 via the addition of the be aware "Imaging", reflecting a rise in emphasis on nonholographic equipment of acoustical visualization. For comfort, no swap has been made within the identify of this released sequence. The 38 papers provided 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 checking 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 tips 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 medical institution of San Francisco; P.N. Keating, Bendix examine Laboratories; A. Korpel, Zenith Radio company; B.J. McKinley, Lawrence Livermore Laboratory; A.F. Metherell, college of Miami; J. Powers, Naval Postgraduate college; and F.L. Thurstone, Duke college. The Editor appreciates the aid of the consultation chairmen: D.R. Holbrooke, kid's medical institution of San Francisco; Mahfuz Ahmed, Zenith Radio company; R.K. Mueller, collage of Minnesota; G. Wade, college of California at Santa Barbara; B.P.
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Extra info for Acoustical Holography: Volume 6
In the replication process an optical quality master is made. The blank acoustic material syntactic form was lapped to an approximate concave spherical shape. Several layers of epoxy were applied in sequence and allowed to cure against the optical master, thus providing a reflecting surface of optical quality. The optical quality of the acousto-optic interface remains the greatest single source of noise in the camera system itself as opposed to subject dependent noise or acoustical speckle. 2 millijoules per pulse) was used.
T ..... t,: .. _,. · ·~ti · . ~ w : )> ..... C 00 THROUGH-TRANSMISSION ACOUSTICAL HOLOGRAPHY -~ ~--· . t ~ . 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.
2 millijoules per pulse) was used. At the four pulse per second frame rate no liquid cooling was required. The laser tube and power supply were built by Hughes Electron Dynamics Division, Torrance, California. Long term optical output stability required the construction of an Invar frame and special mirror mounts. Originally Kodak 649 GH film was used, which has very high resolution, but very low sensitivity, placing severe constraints on the laser. In the clinical prototype an experimental, higher sensitivity film was used (discussed below), thus relaxing the power requirements on the laser and improving reliability.