
Proceedings Paper
Damping models in elastographyFormat | Member Price | Non-Member Price |
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Paper Abstract
Current optimization based Elastography reconstruction algorithms encounter difficulties when the motion approaches
resonant conditions, where the model does a poor job of approximating the real behavior of the material.
Model accuracy can be improved through the addition of damping effects. These effects occur in-vivo due to the
complex interaction between microstructural elements of the tissue; however reconstruction models are typically
formulated at larger scales where the structure can be treated as a continuum. Attenuation behavior in an
elastic continuum can be described as a mixture of inertial and viscoelastic damping effects. In order to develop
a continuum damping model appropriate for human tissue, the behavior of each aspect of this proportional, or
Rayleigh damping needs to be characterized.
In this paper we investigate the nature of these various damping representations with a goal of best describing
in-vivo behavior of actual tissue in order to improve the accuracy and performance of optimization based elastographic
reconstruction. Inertial damping effects are modelled using a complex density, where the imaginary part
is equivalent to a damping coefficient, and the effects of viscoelasticity are modelled through the use of complex
shear moduli, where the real and imaginary parts represent the storage and loss moduli respectively.
The investigation is carried out through a combination of theoretical analysis, numerical experiment, investigation
of gelatine phantoms and comparison with other continua such as porous media models.
Paper Details
Date Published: 29 March 2007
PDF: 12 pages
Proc. SPIE 6511, Medical Imaging 2007: Physiology, Function, and Structure from Medical Images, 65111W (29 March 2007); doi: 10.1117/12.711837
Published in SPIE Proceedings Vol. 6511:
Medical Imaging 2007: Physiology, Function, and Structure from Medical Images
Armando Manduca; Xiaoping P. Hu, Editor(s)
PDF: 12 pages
Proc. SPIE 6511, Medical Imaging 2007: Physiology, Function, and Structure from Medical Images, 65111W (29 March 2007); doi: 10.1117/12.711837
Show Author Affiliations
Matthew D. J. McGarry, Univ. of Canterbury (New Zealand)
Hans-Uwe Berger, Univ. of Canterbury (New Zealand)
Hans-Uwe Berger, Univ. of Canterbury (New Zealand)
Elijah E. W. Van Houten, Univ. of Canterbury (New Zealand)
Published in SPIE Proceedings Vol. 6511:
Medical Imaging 2007: Physiology, Function, and Structure from Medical Images
Armando Manduca; Xiaoping P. Hu, Editor(s)
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