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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 on all scales.- 48. Ultrasonic laboratory measurements on spherical samples - a tool for the investigation of seismic anisotropy in rocks.- 49. Seismic imaging ahead of the tunnel boring machine.- Acoustic Microscopy.- 50. The effect of cementation on the seismic properties of sandstone.- 51. Recent advances in quantitative acoustic microscopy.- 52. New developments in acoustic microscopy.- 53. Scanning acoustic microscopy covering a wide temperature range: SAM(T).- 54. Fundamentals of spatio-temporal Fourier spectroscopy in quantitative acoustic microscopy.- Medical & Biological Imaging.- 55. Ultrasound imaging of propagation of rapid and minute velocity in heart wall.- 56. New developments in ultrasonic adaptive focusing through the human skull: Application to non-invasive brain therapy and imaging.- 57. Harmonic and subharmonic acoustic response of microbubble.- 58. Morphologic operators applied to breast tumour ultrasound image classification.- 59. Ultrasound blood flow imaging in carotid arteries before and after endarterectomy.- 60. Acoustic and mechanical properties of aortic aneurysms assessed by scanning acoustic microscopy.- 61. Real time images of local ultrasonic spectral parameters for tissue differentiation through wavelet transform.- 62. Ultrasonic sound speed microscope for biological tissue characterization driven by nanosecond pulse.- 63. Principle, applications and limitations of ultrasound elastography.- 64. A clinical ultrasound scanner developed for imaging the relative surface attenuation, reflectivity and profile of skin lesions.- 65. 3D simulations of elastic wave propagation in cortical bone.- 66. Ultrasonic imaging and characterization of accupuncture points in classical oriental medicine.- 67. Acoustic microscopy methods in a morphological study of the articular cartilage and subchondral bone.- 68. Assessment of bone properties using high resolution scanning acoustic microscopy.- 69. Quantitative ultrasonic tomography of long bones: Distorted born iterative process.- 70. Imaging prostate brachytherapy seeds with pulse-echo ultrasound and vibroacoustography.- 71. Combination of acoustic and optical microscopy for investiagation of biological cell properties.- 72. Correlative fluorescence and acoustic microscopy in the study of cell volume regulation.- 73. Attenuation mapping of living cells at hypersonic frequencies.- 74. A Doppler viewpoint on microbubble destruction.- 75. Imaging and quantitative data acquisition of thinly and thickly sliced biological tissues with scanning acoustic microscopy.- 76. Ultrasonic diffraction tomography: Multichannel circular antenna.- 77. Evaluation of split spectrum processing as a phase sensitive algorithm to enhance volume based registration.- 78. Application of an acoustic microscope for the assessment of dental cement microstructure and properties during the hardening process.- 79. Ultrasonic examination of hard tissues using Golay complementary series excitation.- 80. Ultrasound spiral computed tomography for differential diagnosis of breast tumors using a conventional ultrasound system.- 81. A new probe for accurate velocity measurements in axial transmission technique: Application to cortical bone evaluation.- 82. Ultrasound based methods for monitoring of thermal therapies.- 83. Speckle reduction by summation of higher order harmonic images.- 84. Coded signals for interoperative registration of the human skull.- 85. A haptic system for virtual reality applications based on ultrasound elastography and electro-rheological fluids.- 86. Multi-frequency quantitative imaging of high contrast objects: A canonical annroximation.- 87. Method to simulate pulse propagation and B-mode images with ultrasound contrast agents, reverberation and Bjerknes forces.- 88. A new approach to diffraction tomography.- Near Field Imaging.- 89. Ultrasonic modes in atomic force microscopy.- 90. Characterization of layered materials with near-field acoustic microscopy.- 91. Ultrasonic atomic force microscopy on spray dried ceramic powder.- 92. Surface and bulk investigation of materials with scanning microdeformation microscopy: What is really investigated?.- 93. Polymer elasticity analysis with atomic force acoustic microscopy.- 94. Recent advances in near field acoustics with resonating horns.- 95. How can ultrasound help with connecting friction and adhesion hysteresis at local scales?.- 96. Towards time-resolved dynamic atomic force microscopy.- 97. Fresnel diffraction measured by scanning force microscopy.- Author Index.