Title :
Viscoelastic characterization of in-vitro canine liver tissue
Author :
Kiss, M.Z. ; Varghese, T.
Author_Institution :
Wisconsin Univ., Madison, WI, USA
Abstract :
Samples of in-vitro canine liver tissue have been subjected to mechanical testing in order to determine their viscoelastic properties, namely, the frequency-dependent complex modulus. Samples include normal tissue, as well as thermal lesions prepared by radiofrequency ablation at various temperatures and cook times. Results are fitted according to the Kelvin-Voigt and Kelvin-Voigt fractional derivative models. The data agrees much better with the Kelvin-Voigt fractional derivative model, suggesting that this model may better represent the viscoelastic properties of some soft tissues. Results are then used in introducing the concept of the complex modulus contrast, whose applications to elastography are discussed.
Keywords :
biological tissues; biomedical ultrasonics; mechanical testing; tumours; viscoelasticity; Kelvin-Voigt fractional derivative models; complex modulus contrast; elastography; frequency-dependent complex modulus; in-vitro canine liver tissue; mechanical testing; radiofrequency ablation; soft tissues; thermal lesions; viscoelastic properties; Biological tissues; Elasticity; In vitro; Lesions; Liver; Mechanical factors; Radio frequency; Temperature; Testing; Viscosity;
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
Print_ISBN :
0-7803-8412-1
DOI :
10.1109/ULTSYM.2004.1418247