In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 127, No. 3_Supplement ( 2010-03-01), p. 2032-2032
Abstract:
Non-ionizing techniques of bone characterization have mostly been based on ultrasonic wave propagation. In this study, bone is characterized via its linear response to vibratory solicitations. The analysis of the response of bones to transient mechanical excitation is made both theoretically and experimentally. An orthotropic three-dimensional finite element interaction model (FEIM) using computerized tomography scan image geometries of excised dry human tibiae bones is developed. The model parameters (nine elastic constants) are recovered by solving an inverse eigenvalue problem using resonance frequencies from vibration spectroscopy. Transient waves are excited and signals acquired along the diaphysis of the tibiae, experimentally by employing piezoelectric transducers and numerically using FEIM and a time integration scheme. The elastic waves propagating as guided modes in the bone are investigated using reassigned bilinear time-frequency distribution. To avoid ambiguity in determining the elastic wave phase velocities due to the dispersive nature of propagation in bone, the longitudinal L(0,1) and flexural F(1,1) phase velocities, measured at their asymptotes, i.e., the bar and Rayleigh velocities respectively, are proposed as indicators for assessing the strength of long bones. Their sensitivity to changes in bone state like the effect of cortical thickness variation due to aging and osteoporosis is examined.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2010
detail.hit.zdb_id:
1461063-2
