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Acoustical imaging has become an indispensable tool in a variety of fields. Since its introduction, the applications have grown and cover a variety of techniques, producing significant results in fields as disparate as medicine and seismology. Cutting-edge trends continue to be discussed worldwide.

This book contains the proceedings of the 27th International Symposium on Acoustical Imaging (AI27), which took place in Saarbrücken, Germany, from March 24th to March 27th 2003. The Symposium belongs to a conference series in existence since 1968. AI27 comprised sessions on: Medical Imaging, Non-Destructive Testing, Seismic Imaging, Physics and Mathematics of Acoustical Imaging, Acoustic Microscopy.

During two well-attended workshops the applications of quantitative acoustical imaging in biology and medical applications, and in near-field imaging of materials, were discussed. Based on its cross-disciplinary aspects, the authors of the papers of AI27 present experiments, theory and construction of new instruments.

Acoustical Imaging. Vol.27

Components & Systems.- 1. Micromachined ultrasonic transducers and their use for 2D and 3D imaging.- 2. Portable ultrasonic phased array system.- 3. A novel approach for ultrasonic imaging of sheet contours for hydroforming.- 4. A phased array system for the acquisition of ultrasonic RF-data up to 20 MHz.- 5. Computation and properties of the wide-band beam pattern.- 6. A fine pitch interconnection method for high frequency ?-spaced linear arrays using MicroFlex technology.- 7. Design and construction of a blood flow detector probe for medical application.- NDT.- 8. Synthetic aperture focusing technique for industrial applications.- 9. Interaction of short pulses of focused ultrasound with interfaces and plane-parallel objects.- 10. Third order elastic constant diffraction tomography.- 11. Characterization of the fatigue damage of advanced ceramic composites by scanning acoustic microscopy.- 12. Nonlinear acoustic imaging: Fundamentals, methodology, and NDE-applications.- 13. Acoustic visualization of interface deterioration in adhesive bond joints.- 14. Ultrasonic Imaging of thin materials using high resolution air-coupled transducers.- 15. Ultrasound thermography in NDE: Principle and applications.- 16. Ultrasound diffusion for crack depth determination in concrete.- 17. Imaging of cracks and honeycombing in concrete elements.- 18. Rapid imaging of large steel plate structures using guided waves.- 19. Ultrasonic techniques for imaging and measurements in molten magnesium using clad buffer rods.- 20. Acoustic imaging with surface and Lamb waves for NDE and material characterisation.- 21. Ultrasound activated speckle interferometry for defectselective imaging in NDE: Principle and applications.- 22. Electrical impedance matching of PVDF ultrasonic transducers.- 23. A new structure of SH wave electromagnetic acoustic transducer (EMAT).- 24. An array implementation of the resonance spectroscopy method for adhesive bonding imaging.- 25. Investigation of structure and properties of immisible polymer blend by acoustic microscopy techniques.- 26. Measuring sound velocities and anisotropy of microstructural units of laminate composite materials by microacoustical technique.- 27. Ultrasonic imaging of rubber material and rubber metal interfaces.- 28. Evaluation of rubber-PVC blends structure and properties using scanning acoustic microscope.- 29. Acoustic microscopy, Brillouin scattering and laser-SAW technique for defect characterization in DLC films.- 30. Application of microacoustical technique to study elastic properties and microstructure of new generation of bulk metallic glasses.- 31. Imaging of carbon-fiber-reinforced (CFR) laminates microstructure by acoustic microscopy.- 32. Image reconstruction in transmission ultrasound tomography.- 33. Abberation correction in near fiield tomography.- 34. Fast simulation of ultrasonic B-mode images.- 35. An educational model and toolbox for acoustic tomographic imaging.- 36. Acoustic travel time tomography as a method to observe turbulent structures in the atmospheric boundary layer.- 37. Nonlinear acoustic methods for crack vision.- 38. Optical observation of shock wave propagation caused by a collapsing bubble.- 39. New informative possibilities of active-passive thermoacoustic tomography.- 40. Optical measurement and visualization of transient ultrasonic wave fields.- 41. Recovery of the shape and location of a rigid cylindrical body from experimental scattered acoustic field data.- 42. Effects, connected with passing of high frequency longitudinal wave through the film-sublayer system in the direction normal to the contact plane.- 43. Characterization and imaging of thin, highly oriented layers: Theory and experiment.- 44. Nonlinear acoustic vision of bubble objects and flows.- 45. Split phase processing - a single image, resolution loss free method for ultrasound speckle reduction.- 46. Quantum acoustical imaging.- Seismic Imaging.- 47. Seismic imaging - prospects and challenges