Riassunto
This volume contains forty-six of the papers presented at the Ninth International Symposium on Acoustical Imaging held December 3-6, 1979, in Houston, Texas. The theme of the confer ence was the integration of applications technology. The major objective of the conference was to promote interaction among researchers working on different applications of acoustical imaging. In addition to serving as a state-of-the-art research ref erence, this volume includes six tutorial review papers. For convenience, all the papers are grouped under the following headings: methods, transducers, processing and display, phased array considerations, acoustic microscopy/non-destructive evalu ation, reconstructive tomography and inversion techniques, tissue characterization and impediography, nedica1 applications, under water applications, and seismic applications. The editor would like to thank the authors and the confer ence participants. The editor would also like to express his appreciation for the assistance in evaluating the abstracts from the following members of the Program Committee: Mahfuz Ahmed, University of California Irvine l:1edica1 Center; Pierre A1ais, Paris University, France; C. B. Burckhardt, Hoffman-Laroche, Basel, Switzerland; B. P. Hildebrand, Spectron Development Labora tories, Inc. , Costa Mesa, California; Larry W. Kessler, Sonoscan, Inc. , Bensenville, Illinois; Rolf Uue11er, University of Hinnesota, l1inneapo1is, Uinnesota; John P. Powers, Naval Post Graduate School, J:1onterey, California; Jerry L. Sutton, Naval Ocean Systems Center, San Diego, California; F. L. Thurstone, Duke University, Durham, North Carolina; Robert C. Waag, University of Rochester, Rochester, New York; and Glen Wade, University of California, Santa Barbara, California.
Contenuti
Methods.- Alternative Scanning Geometries for High-Speed Imaging with Linear Ultrasonic Arrays.- Acoustical Imaging by Means of Multi-Frequency Hologram Matrix.- Focused Line Source Linear Array Holography Using a Three Dimensional Computer Reconstruction System.- Electronic Analog Devices for Sector Scan Imaging.- New Arrangements for Fresnel Focusing.- Ultrasonic Imaging Using Trapped Energy Mode Fresnel Lens Transducers.- Nonlinear Effects in Acoustic Imaging.- Low Frequency Imaging Technique for Acoustic and Elastic Waves.- Transducers.- Acoustic Switching Ratios of Piezoelectric and Electrostrictive OAT’s.- Spatial Frequency Characteristics of Optoacoustic Transducers.- Two-Dimensional Measurement of Ultrasound Beam Patterns As a Function of Frequency.- Processing and Display.- An Integrated Circuit Image Reconstruction Processor.- Adaptive Array Processing for Acoustic Imaging.- Computer Holographic Reconstruction System Implementing Integrated Three Dimensional Multi-Image Technique.- Ultrafast Analogical Image Reconstruction Device With Slow Motion Capability.- Display of 3-D Ultrasonic Images.- Phased Array Considerations.- Tolerance Analysis for Phased Arrays.- Quadrature Sampling for Phased Array Application.- Acoustic Microscopy/Non-Destructive Evaluation.- Acoustic Microscopy — A Tutorial Review.- Defect Characterization by Means of the Scanning Laser Acoustic Microscope (SLAM).- Imaging in NDE.- A Real-Time Synthetic-Aperture Imaging System.- Transmission Imaging: Forward Scattering and Scatter Reconstruction.- Reconstructive Tomography and Inversion Techniques.- Ultrasonic Imaging by Reconstructive Tomography.- Experimental Results in Ultrasonic Diffraction Tomography.- Explicit Inversion of the Helmholtz Equation for Ultrasound Insonification and Spherical Detection.- Approximate Propagation Speed Reconstruction Over A Prescribed Background Slab.- Tissue Characterization and Impediography.- Theory and Measurements of Ultrasonic Scattering for Tissue Characterization.- A Computerized Data Analysis System for Ultrasonic Tissue Characterization.- Impediography Revisted.- Tissue Characterization by Ultrasonic Impediography.- Medical Applications.- Combined Two-Dimensional Tissue/Flow Imaging.- An Ultrasound Imager for Fetal Respiratory Research.- Intraesophageal Ultrasonic Imaging of the Canine Heart.- Comparison of Ultrasonography With X-Ray Computer Tomography and Radionuclide Scan in Terms of Medical Diagnostic Value.- Ultrasound and Pathology.- In Vivo Quantitation of Induced Ultrasonic Contrast Effects in the Mouse.- Underwater Applications.- A Tutorial on Underwater Imaging.- Digital Reconstruction of Acoustic Holograms in the Space Domain with a Vector Space Approximation.- Data Acquisition Systems for Computer Aided Coherent Acoustic Imaging.- Seismic Applications.- Seismic Imaging.- A Frequency/Dip Formulation of Wave Theoretic Migration in Stratified Media.- Limitations in the Reconstruction of Three-Dimensional Subsurface Images.- Comparison of Some Seismic Imaging Techniques.- Seismic Imaging with Lenseless Fourier Transform Holography.- Phase Contrast Enhancement Techniques Using Generalized Holographic Interferograms for Seismic Applications ·.- List of Participants.
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