Download Acoustical Imaging (Volume 24) by Hua Lee PDF

By Hua Lee

The foreign Symposium of Acoustical Imaging has been widely known because the optimum discussion board for displays of complex learn lead to either theoretical and experimental improvement. Held usually seeing that 1968, the symposium brings jointly foreign prime researchers within the region of acoustical imaging. The lawsuits from the twenty fourth assembly include articles at the following issues: complicated structures and strategies, Microscopy and Nondestructive review, and Biomedical purposes.

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Vol. 21, pp. 375381, 1949. L. Folds, “Focusing Properties of Solid Ultrasonic Cylindrical Lenses”, J. Acoust. Soc. , vol. 53, pp. 826-834, 1973. 6 Y. Tannaka & T. Koshikawa, “Solid-Liquid Compound Hydroacoustic Lens of Low Aberration”, J. Acoust. Soc. , vol. 53, pp. 590-595, 1973. W. J. Williams, “Lenses and Ultrasonic Imaging”, in Acoustical Holography, Vol. 7, ed. W. Kessler, Plenum Press, NY, pp. 133-153, 1977. 8 B. Kamgar-Parsi, B. L. Folds & E. Belcher, “High-Resolution Underwater Acoustic Imaging with Lens-Based Systems", Int.

At the focal depth, the largest aperture produced the greatest Figure 3. Measured beamformer gain as a function of receive aperture size, for diffuse backscattering from foam, for each of the four transmit aperture sizes show in Fig. 1; (a) at the focal depth of 8 cm, (b) at 4 cm and (c) at 14 cm. The dotted straight-lines show the results expected for conditions of perfect spatial coherence. beamformer gain, with each decrease in transmit aperture producing a corresponding decrease in gain. Overall beamformer gain is lower for the 4 cm and 14 cm depths than for the focal depth and, at 4 cm depth, beamformer performance is poorest for the largest 45 transmit aperture.

Edited by Hua Lee, Kluwer Academic/Plenum Publishers, 2000. 35 FOUNDAMENTAL BASIS OF URT Basic principles of URT are now well established for weakly varying media as biological structures [1]. If we suppose the medium is composed of a known part (the background) identified by the density ρ 0 and the celerity c 0 , and an unknown part (the perturbation) identified by ρ and c, the Equation that describes acoustic propagation/diffusion phenomena in the medium (including the boundary and Sommerfeld conditions) result from the Pekeris Equation and is given, for weak-scattering ( ρc << ρ 0 c 0 ), by : (1) where p is the acoustic pressure.

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