Simulation of ultrasound propagation through three-dimensional trabecular bone structures: Comparison with experimental data

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作者：
Padilla, Frederic [1 ]
Bossy, Emmanuel [2 ]
Laugier, Pascal [1 ]
机构：
[1] Laboratoire d'Imagerie Parametrique, CNRS, Universite Paris 6, 15 rue de l'Ecole de Medecine, 75006 Paris, France
[2] Laboratoire d'Optique Physique, ESPCI CNRS, 10 rue Vauquelin, 75005 Paris, France
来源：
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers | 2006年 / 45卷 / 8 A期
关键词：
We present a direct comparison between numerical simulation of wave propagation; performed through 28 volumes of trabecular bone; and the corresponding experimental data obtained on the same specimens. The volumes were reconstructed from high resolution synchrotron microtomography experiments and were used as the input geometry in a three-dimensional (3D) finite-difference simulation tool developed in our laboratory. The version of the simulation algorithm that was used accounts for propagation in both the saturating fluid and bone; and does not take absorption into account. This algorithm has been validated in a previous paper [Bossy et al.: Med. Biol. 50 (2005) 5545] for simulation of wave propagation through trabecular bone. Two quantitative ultrasound parameters were studied at 1 MHz for both simulated and experimental signals: the normalized slope of the frequency dependent attenuation coefficient (also called normalized broadband ultrasound attenuation (nBUA) in the medical field); and the phase velocity at the center frequency. We show that the simulated and experimental nBUA are in close agreement; especially for the high porosity specimens. For specimens with a low porosity (or a high solid volume fraction); the simulation systematically underestimate the experimentally observed nBUA. This result suggests that the relative contribution of scattering and absorption to nBUA may vary with the bone volume fraction. A linear relationship is found between experimental and simulated phase velocity. Simulated phase velocity is found to be slightly higher than the experimental one; but this may be explained by the choice of material properties used for the simulation. © 2006 The Japan Society of Applied Physics;
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页码：6496 / 6500
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