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By G. A. D. Briggs, C. M. W. Daft, A. F. Fagan, T. A. Field, C. W. Lawrence, M. Montoto (auth.), Hiroshi Shimizu, Noriyoshi Chubachi, Jun-ichi Kushibiki (eds.)

The seventeenth foreign Symposium on Acoustical Imaging used to be held at Tohoku collage, Sendai, Japan, in the course of might 31-June 2, 1988. The symposium used to be prepared by way of the ultrasonics learn crew of Tohoku collage and the IEEE ijFFC Society, Tokyo bankruptcy. Of the 128 papers submitted, 88 have been offered through the symposium, which comprised one hundred forty four researchers from thirteen nations. This quantity comprises eighty one papers because the checklist of the symposium and is clas­ sified into the next sections: (1) Acoustic Microscopy and its purposes; (2) Non-Destructive assessment; (3) sign Processing of pictures; (4) Acoustic Measurements and actual Acoustics; (5) clinical Ultrasonic Diagnostics; (6) Acoustic Sensors; (7) Acoustic Holography and Tomography; (8) Seismic Exploration; and (9) Imaging Instrumentation and different options. the various papers submitted have been linked to scientific ultrasonic diagnostics and acoustic microscopy, reflecting an important job in acousti­ cal imaging at Tohoku college. for this reason, invited talks have been keen on this sector: acoustic microscopy through Dr. G. A. D. Briggs of the collage of Oxford and clinical ultrasonics through Prof. M. Tanaka of Tohoku college. In gentle of the heritage of study during this box at our collage, we're overjoyed to have had the chance to host the seventeenth symposium.

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Polycrystalline unless noted; b. ; c. 0 GHz 8. Finally, the results of a brief literature search that revealed some variations in the elastic properties, particularly bulk velocities of the polycrystalline titanium metal is summarized in Table 1. The acoustic velocity appears to be subject to an uncertainty of 1% and a consequent 2 % variation in the value of the corresponding modulus. The additional information for crystalline titanium with natural hexagonal anisotropy (hcp) is supplied to suggest that one possible explanation for the variation in published material properties lies the large anisotropy factor of titanium 9 .

A one-to-one comparison requires a complete system analysis and depends on the total input powers. However, one must point out that, regardless of any topography, the differential amplitude signal can arise only from impedance differentials encountered by the two beams. SCAN DIRECTION l ~1________~10~m fSTAINLESS STEEL IT 1 .. 0 - - - - - - 2mm ----_'I (a) (b) Figure 5. (a) Schematic of the sample and (b) differential amplitude line scans. 23 Figure 6. Differential amplitude images obtained from a coin.

23 Figure 6. Differential amplitude images obtained from a coin. (a) Two foci scanned along horizontal direction and (b) two foci scanned along vertical direction. Figure 6(a) shows an image obtained from a coin. In this image, the two beams have been scanned along the horizontal direction and it is evident that the image is mainly differential along this direction. Figure 6(b) illustrates an image taken with the lens rotated by 90 0 . We see that the differentiation is more pronounced along the vertical direction.

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