Three-dimensional simulations of ultrasonic axial transmission velocity measurement on cortical bone models
| Autor: | Pascal Laugier, Maryline Talmant, Emmanuel Bossy |
|---|---|
| Přispěvatelé: | Laboratoire d'Imagerie Paramétrique (LIP), Université Pierre et Marie Curie - Paris 6 (UPMC)-IFR58-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Acoustics and Ultrasonics [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging Bioacoustics MESH: Algorithms MESH: Imaging Three-Dimensional MESH: Ultrasonics MESH: Signal Processing Computer-Assisted Curvature Models Biological Bone and Bones MESH: Porosity Imaging Three-Dimensional Optics MESH: Computer Simulation Arts and Humanities (miscellaneous) Speed of sound medicine Humans Computer Simulation Ultrasonics Anisotropy Ultrasonography MESH: Humans business.industry Isotropy MESH: Models Biological Signal Processing Computer-Assisted MESH: Bone and Bones Wavelength medicine.anatomical_structure MESH: Anisotropy Ultrasonic sensor Cortical bone business Porosity Algorithms |
| Zdroj: | Journal of the Acoustical Society of America Journal of the Acoustical Society of America, 2004, 115 (5 Pt 1), pp.2314-24 |
| ISSN: | 0001-4966 1520-8524 |
| DOI: | 10.1121/1.1689960 |
| Popis: | The ultrasonic axial transmission technique, used to assess cortical shells of long bones, is investigated using numerical simulations based on a three-dimensional (3D) finite difference code. We focus our interest on the effects of 3D cortical bone geometry (curvature, cortical thickness), anisotropy, and microporosity on speed of sound (SOS) measurements for different frequencies in the MHz range. We first show that SOS values measured on tubular cortical shells are identical to those measured on cortical plates of equal thickness. Anisotropy of cortical bone is then shown to have a major impact on SOS measurement as a function of cortical thickness. The range of SOS values measured on anisotropic bone is half the range found when bone is considered isotropic. Dependence of thickness occurs for cortical shell thinner than 0.5 x lambda(bone) in anisotropic bone (lambda(bone): wavelength in bone), whereas it occurs for cortical shell thinner than lambda(bone) when anisotropy is neglected. Sensitivity of SOS along the bone axis to intracortical microporosity is shown to be approximately -20 m s(-1) per percent of porosity. Using homogenized porous bone, we finally show that the cortical depth that contributes to lateral wave SOS measurement is approximately 1-1.5 mm for frequencies ranging from 500 kHz to 2 MHz under classical in vivo measurement conditions. |
| Databáze: | OpenAIRE |
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