Journal
JOURNAL OF ULTRASOUND IN MEDICINE
Volume 31, Issue 12, Pages 2001-2011Publisher
WILEY
DOI: 10.7863/jum.2012.31.12.2001
Keywords
mechanical model; shear viscoelasticity; tissue characterization; ultrasound vibrometry
Funding
- National Natural Science Foundation of China [30970781, 61031003]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100181110002]
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Ultrasound vibrometry can measure the propagation velocity of shear waves in soft tissue noninvasively, and the shear moduli of tissue can be estimated inversely from the velocities at multiple frequencies. It is possible to choose the appropriate model for tissue characterization from mathematical methods and analysis of model behaviors. The three classic models, Voigt, Maxwell, and Zener, were applied to fit the velocity measurements and estimate shear moduli of porcine livers with different thermal damage levels and different storage times. The Zener model always provided the best estimation of the moduli with the minimum errors in our experiments. Unlike the Voigt and Maxwell models, the moduli of the Zener model cannot be used to indicate damage levels in porcine livers directly, but the creep and relaxation behaviors of the Zener model are effective.
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