Acoustical Imaging

ISBN-13: 9781461297154 / Angielski / Miękka / 2011 / 606 str.

M. Kaveh; R. K. Mueller;J. F. Greenleaf

Opis

This volume constitutes the proceedings of the Thirteenth Inter national Symposium on Acoustical Imaging which was held in Minneapolis, Minnesota during October 26-28, 1983. Forty-eight research papers were presented during the meeting by researchers from twelve countries, again demonstrating the true international character of these meetings. Of these presentations this volume contains forty-two complete manuscripts. The abstracts for addi tional papers that were not available at publication time are also included. According to the recent tradition of these symposia an inter disciplinary program under the general theme of acoustical imaging was organized. This can clearly be observed from the wide range of topics and approaches contained in the following manuscripts. There are papers of mathematical nature dealing with the basis of image formation and algorithms for digitally carrying out specific imaging tasks. One finds manuscripts dealing with the design and construction of imaging transducers as well as complete imaging systems. Applications include medical imaging and nondestructive testing, seismic and underwater imaging. This volume, therefore, should be of interest to active researchers in acoustical imaging as a report on current research and to workers in signal process ing, sonics and ultrasonics who are interested in exploring the diverse areas of application for their fields of interest. These proceedings are organized in seven topical sections, paral leling the sessions of the conference. These are: Inversion and Tomography, Microscopy, Scattering and Propagation, Tissue and Material Characterization, Signal Processing, Transducers and Arrays, Imaging Systems and Special Techniques."

Spis treści

Inversion and Tomography.- Inverse Solution for Multiple Scattering in Inhomogeneous Acoustic Media.- A Filtered Backpropagation Algorithm for Fan Beam Diffraction Tomography (Abstract).- Fourier Domain Reconstruction Methods with Application to Diffraction Tomography.- Image Reconstruction from Limited Projections Using the Angular Periodicity of the Fourier Transform of the Radon Transforms of an Object.- Multi-Frequency Diffraction Tomography.- The Inverse Acoustical Scattering Problem for Layered Media in the Presence of Broad-band Acoustic Noise and with Limited Transducer Bandwidth.- Fast Iterative Algorithms for Inverse Scattering Solutions of the Helmholtz and Riccati Wave Equations.- Microscopy.- Acoustical Imaging/NDE of Complex Geometries Using Refraction and Reflection Transmission Techniques in Acoustic Microscopy (Abstract).- Computer-Assisted Tomographic Acoustic Microscopy for Subsurface Imaging.- The Origin of Grain Contrast in the Scanning Acoustic Microscope.- Detection of Surface-Breaking Cracks in the Acoustic Microscope.- Scattering and Propagation.- Description of the Pulsed Acoustic Field of a Linear Diagnostic Ultrasound Array Using a Simple Approximate Expression.- Cross-Sectional Measurements and Extrapolations of Ultrasonic Fields (Abstract).- Spectrum of Echo Scattered by Simple Object Placed at Focal Plane of Ultrasonic Transducer.- Measurement and Simulation of the Scattering of Ultrasound by Penetrable Cylinders.- Fresnel Approximation in the Non Paraxial Case and in Absorbing Media.- Tissue and Material Characterization.- Material Characterization by Acoustic Line-Focus Beam.- Ultrasonic Velocity Spatial Distribution Analysis of Biological Materials with the Scanning Laser Acoustic Microscope.- Diffraction of Ultrasound by Soft Tissues: The Inhomogeneous Continuous Model.- Tissue Information from Ultrasound Scattering.- Signal Processing.- Stable Impedance Profile Reconstruction by Spike Train Approximation.- Golay Codes for Simultaneous Multi-Mode Ultrasonic Imaging.- Spectral Equalisation: A Signal Processing Technique to Increase Pulse-Echo Signal Bandwidth.- The Modified Discrete Wigner Distribution and Its Application to Acoustic Well Logging.- Two-Dimensional Statistical Analysis of Synthetically Focused Images.- TRANSDUCERS AND ARRAYS.- Acoustical Imaging Techniques Applied to General Transducer Design.- Fresnel Zone Plate and Fresnel Phase Plate Patterns for Acoustic Transducers.- A New Technique for Realizing Annular Arrays or Complex Shaped Transducers.- A Hybrid Trapped Energy Mode Transducer.- Annular Surface Wave Transducer.- Imaging Systems.- Acoustic Spectral Interferometry: A New Method for Sonic Velocity Determination.- Thermoacoustic Imaging Induced by Deeply Penetrating Radiation.- Observation of Acoustic Signals from a Phantom in an 18 Mev Electron Beam for Cancer Therapy.- Holographic Imaging System Using Wideband Chirped Ultrasound.- Real-time 2-Dimensional Doppler Flow Mapping Using Auto-Correlation.- Imaging of the Ultrasonic Velocity and Reflection Properties of Objects by a C-Scan Method.- Improvement and Quatitative Assessment of B-Mode Images Produced by Annular Array/Cone Hybrids (Abstract).- Image Interpolation for Real-Time Compound Dual Sector Scans.- A Digital Pulse-Echo System Based on Acoustic Inversion (Abstract).- A Dual B-Scan for Attenuation Acoustical Imaging.- In-Situ Silt Density Measurements Using a Broadband Parametric Sound Source.- Computer-Aided Imaging with Optically-Scanned Acoustic Transducers.- Special Techniques.- Simulation of Imaging Systems for Underwater Viewing.- Imaging of Cluttered Targets in Colourerd Absorptive Media.- Seismic Tomography Applied to Surface Wave Analysis.- Application of Acoustical Holography to Noise Suppression.- Probabilistic Image Reconstruction Using Experimental Ultrasonic Data.- Errata “Generalization of Gabor’s Theory?The Theory of Multi-beam Holographic Interference.- Participants.- Author Index.