Acoustical Imaging: Ultrasonic Visualization and Characterization(8 Acoustical Imaging)

This volume contains the Proceedings of the Eighth International Symposium on Acoustical Imaging, held in Key Biscayne, Miami, Florida May 29th to June 2nd, 1978. The title of the Symposium was changed again this year by dropping the word "Holography" to reflect the further emphasis on the general imaging aspects of the Symposium and the de-emphasis on the Holographic aspects. Because of this continued changing nature of the Symposium Series this volume has undergone the title change from ACOUSTICAL HOLOGRAPHY to ACOUSTICAL IMAGING. The 47 papers presented here illustrate the continued growth in this dynamic field. There has been a large emphasis on Array Technology as well as Underwater Applications, Seismic Applications, Transducers, New Methods, Acoustic Microscopy, Non-destructive Testing, Computer Tomography Techniques, Medical Applications as well as Tissue Characterization. The meeting was a great success and a stimulating experience for all concerned due principally to the enthusiasm and contrib­ utions of all of the authors represented here. The editor wishes to extend his appreciation and thanks to each and everyone of them. The editor also wishes to thank the members of the Program Committee who helped in selecting the papers and giving their able advice on the details of the meeting. The Program Committee con­ sisted of Pierre Alais, University of Paris, Byron B. Brendon, Holosonics, Inc. , C. B. Burckhardt, Hoffman-LaRoche and Co. , Basle, Switzerland, Philip S. Green, Stanford Research Institute, Menlo Park, California, B. P.

Table of Contents:
Digital Scan Conversion and Smoothing for a Real Time Linear Array Imaging System.- Doppler Wavefront Distortion Effects Due to Continuous Dynamic Array Focusing.- A 1-MHz Linear Phased Array Ultrasound System for Intracranial Imaging.- A Digital Synthetic Focus Acoustic Imaging System.- A Flexible, Real-Time System for Experimentation in Phased-Array Ultrasound Imaging.- Monolithic Silicon-PVF2 Piezoelectric Arrays for Ultrasonic Imaging.- Acoustical Holography Matrix Array Imaging System for the Underwater Inspection of Offshore Oil Platform Weldments.- Ultrasonic Imaging Using Monolithic Mosaic Transducer Utilizing Trapped Energy Modes.- Progress in Fresnel Imaging, Clinical Evaluation.- Theoretical Aspects of the Fresnel Focusing Technique.- An Analysis of Pulsed Ultrasonic Arrays.- Three Dimensional Passive Acoustical Imaging System Using Hemispherical Array Detectors.- Periodic Sampling Errors in Scanned Ultrasonic Holography.- Underwater Applications.- Description of Navy Holographic Underwater Acoustic Imaging System (AIS).- A Computer-Aided Ultrasonic Imaging System.- An Experimental Underwater Acoustic Imaging System Using Multibeam Scanning.- Three-Dimensional Acoustic Imaging.- Angle-Look Sonar.- Seismic Applications.- Seismic Holography In a Norwegian Fiord.- Transducers.- Imaging Characteristics of Clinical Ultrasonic Transducers in Tissue-Equivalent Material.- Magnetostrictive Imaging Systems.- Magnetosonic Image Converter.- Acoustic Imaging Via the Acousto-Photorefractive Effect.- A Polyvinylidene Fluoride Bow-Tie Imaging Element.- A Matrix Technique for Analyzing the Performance of Multilayered Front Matched and Backed Piezoelectric Ceramic Transducers.- Methods.- On Obtaining Maximum Performance From Liquid Surface Levitation Holography.- Reflected Bragg Imaging Studies and Preliminary Results for Improved Optical Design.- Angular Spectrum Filtering of Parasitic Images Introduced by the Spatial Sampling of Acoustical Images.- Super-Resolution for Separating Clustered Images.- Three Dimensional Imaging by Wave-Vector Diversity.- Tissue Characterization.- The Impediography Equations.- Techniques for InVivo Tissue Characterization.- InVivo Characterization of Several Lesions in the Eye Using Ultrasonic Impediography.- High Resolution Imaging of Filtered Ultrasonic Echo Responses.- Computer Tomography.- Acoustic Echo Computer Tomography.- Algebraic and Analytic Inversion of Acoustic Data from Partially or Fully Enclosing Apertures.- Breast Imaging by Ultrasonic Computer-Assisted Tomography.- A New Approach to Acoustic Tomography Using Diffraction Techniques.- Acoustic Microscopy/NDT.- Scanning Acoustic Microscope Operating in the Reflection Mode.- Nondestructive Testing.- A Practical Linear Array Imaging System for Non-destructive Testing Applications.- Experiences in Using Ultrasonic Holography in Laboratory and in the Field with Optical and Numerical Reconstruction.- Digital Signal Processing in Acoustical Focused Image Holography.- Medical Applications.- Dynamic Imaging of the Aorta InVivo with 10 MHz Ultrasound.- The Focussing of Ultrasound Beams Through Human Tissue.- Myocardial Blood Flow: Visualization with Ultrasonic Contrast Agents.- Computer Analysis of Grey Scale Tomograms.- The Information Content of B-Scan Anomalies.- Incentives for Using Higher Frequency in Ultrasonic Imaging.- Participants.