Iwaki Akiyama's Acoustical Imaging: Volume 29 PDF

By Iwaki Akiyama

ISBN-10: 1402088221

ISBN-13: 9781402088223

ISBN-10: 140208823X

ISBN-13: 9781402088230

The 29th foreign Symposium on Acoustical Imaging used to be held in Shonan Village, Kanagawa, Japan, April 15-18, 2007. This interdisciplinary Symposium has been happening each years in view that 1968 and kinds a different discussion board for complicated study, overlaying new applied sciences, advancements, tools and theories in all parts of acoustics. during the years the volumes within the Acoustical Imaging sequence have constructed and develop into recognized and preferred reference works.

Offering either a large standpoint at the state of the art within the box in addition to an in-depth examine its innovative study, this quantity 29 within the sequence includes back an exceptional selection of seventy papers awarded in 9 significant different types: (1) pressure Imaging, (2) organic and clinical functions, (3) Acoustic Microscopy, (4) Non-Destructive review and commercial functions, (5) parts and platforms, (6) Geophysics and Underwater Imaging, (7) Physics and arithmetic, (8) clinical picture research, (9) FDTD strategy and different Numerical Simulations.

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These are represented as cylinders in Fig. 3, one for each window, and we need to interpolate them to the finer display grid, represented as circles in Fig. 3. We do not assume that the 3D displacement applies at each window’s centre, since this results in the well-known amplitude-modulation artefact in the final strain image. Instead, we use an amplitude-modulation correction (AMC) technique [3] to estimate the location in each window where the 3D displacement is most valid (the arrows at the base of each cylinder in Fig.

Ophir, I. Cespedes, H. Ponnekanti, Y. Yazdi and X. Li: Elastography: Ultrason. Imag 13 (1991) 111. 2. K. J. Parker, S. R. Huang, R. A. Musulin and R. M. Lerner: Ultrason. Med. Biol. 16 (1990) 241. 3. T. Shiina, N. Nitta, E. Ueno, J. C. Bamber: J. Med. Ultrason. 29 (2002) 119. 4. A. Itoh, E. Ueno, E. Tohno, H. Kamma, H. Takahashi, T. Shiina, M. Yamakawa, T. Matsumura: Radiology, 231 (2006) 341. 5. M. Yamakawa, N. Nitta, T. Shiina, T. Matsumura, S. Tamano, T. Mitake and E. Ueno: Jpn. J. Appl. Phys.

Therefore, the instantaneous displacement Δxd (n) between these two consecutive frames is estimated as follows: Δxd (n) = c0 Δ θ d (n) , 4 π f 0e (1) Strain Imaging for Arterial Wall 21 where c0 and f0e are the speed of sound and the frequency used for displacement estimation, respectively. Phase shift Δθd(n) is estimated by the complex cross-correlation function γd,n using the complex quadrature demodulated signals z(d; n) of received RF echo as follows: Δ θ d ( n ) = ∠γ d , n = ∑ z * ( d + xd ( n ); n ) ⋅ z ( d + xd ( n ); n + 1), (2) d ∈R where * shows the complex conjugate.

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Acoustical Imaging: Volume 29 by Iwaki Akiyama

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