Acoustical Imaging

This volume contains forty-one papers presented at the Eleventh International Symposium on Acoustical Imaging held on 4-7 Ma~ in Monterey, California. The objective of this conference series is to bring together workers in diverse areas and applications of Acoustical Imaging for interaction and exchange of ideas. People working in other aspects of scalar wave theory and applications also benefit from this series. The papers presented here demonstrate continued growth in the activity of this field. In this conference there was emphasis on New Techniques, Acoustic Tomography, Tissue Characterization, Signal Processing, Inversion Techniques, and Transducers and Arrays. The success and stimulation of the conference and of the papers presented in this volume is owed, of course to the authors and participants. Many thanks are due to the authors and their co-workers for their diligence and enthusiasm in performing their research, preparing their manuscripts and presenting their results. The editor would like to express his appreciation to each and every one of them. Front Matter....Pages i-xi Scanning Acoustic Microscopy of Solid Objects Using Aspheric Lenses....Pages 1-19 A Digital Processing System for Acousto-Optic Visualization of Sound Fields....Pages 21-37 Acoustical Imaging Using Focalization under Oblique Incidence through an Interface — Application to Non Destructive Testing....Pages 39-52 Generation of Acoustical Images from the Absorption of Pulsed Microwave Energy....Pages 53-59 A Thermoplastic Acoustical Holography Recording Device....Pages 61-76 Two-Dimensional Imaging with a High Resolution PVF 2 /Si Optically-Scanned Receiving Transducer....Pages 77-93 An Ultrasonic Determination of Cardiac Muscle Structures....Pages 95-108 The Application of Diffraction Analysis to Liver and Thyroid Disease....Pages 109-126 Tissue Parameter Measurement and Imaging....Pages 127-137 Pulse Scattering in Dispersive Media....Pages 139-147 An Absolute Measurement of Backscattering Coefficients for Excised Human Tissues and Its Relevance to Abdominal Imaging....Pages 149-166 The Design and Application of Software Filters to Improve Lateral Resolution in A B-Mode Ultrasonogram....Pages 167-179 Digital Filtering of Acoustic Images....Pages 181-208 Two-Dimensional Null Processing....Pages 209-223 Acoustic Imaging in Marine Sediment: A Multiple Microprocessor Array Processor Using the Trace Function....Pages 225-243 Phase Error Reduction Method for a Towed Array....Pages 245-261 Digital Enhancement of Ultrasonic Images and Its Application to Non-Destructive Testing of Composite Materials....Pages 263-276 Preliminary Results of Computer Aided Acoustic Imaging....Pages 277-287 An Optimum Ultrasonic Imaging System Using ARMA Processing....Pages 289-308 Ultrasonic Planar Scanned Tomography....Pages 309-323 A Comparison of Born and Rytov Approximations in Acoustic Tomography....Pages 325-335 Tomographic Evaluation of Sound Fields from Acousto-Optic Data....Pages 337-349 Effects of Diffraction on Ultrasonic Computer-Assisted Tomography....Pages 351-363 An Exact Theory for Coherent Acoustic Probing....Pages 365-383 Acoustical Holography is, at Best, Only a Partial Solution to the Inverse Scattering Problem....Pages 385-398 Inverse Scattering, Inverse Field, and Inverse Source Theory....Pages 399-408 Wave Equations and Inverse Solutions for Soft Tissue....Pages 409-424 Asymptotic Ultrasonic Inversion Based on Using more than One Frequency....Pages 425-444 The Properties and Performance of a Si-PVF 2 Optically Controlled Acoustic Point Source....Pages 445-462 Effect of Mechanical Aberrations on the Resolution of Fresnel Zone Plate Transducers....Pages 463-478 Sidelobe Reduction of the Ring Array for Use in Circularly Symmetric Imaging Systems....Pages 479-490 Anomalous Quantization Error Lobes in Phased Array Images....Pages 491-503 Multi-Element Arrays for NDE Applications....Pages 505-519 Study of the Normal Modes of Vibration of the Piezoelectric Transducers Used in Acoustic Imaging Applications....Pages 521-528 Linear Impulse Holography....Pages 529-547 Acoustic Passive Remote Temperature Sensing....Pages 549-561 The Speed of Sound as a Thermal Image CT Scan Parameter....Pages 563-582 Focused Acoustic Beams for Accurate Phase Measurements....Pages 583-595 High Resolution Ultrasonic Testing System Using Dynamic Focusing and Signal Correlation....Pages 597-608 Eddy Current Phasography....Pages 609-623 A 50 MHz Synthetic Focus System....Pages 625-645 Back Matter....Pages 647-658