Title :
Ex vivo measurements of mechanical properties of myocardium using Lamb and Rayleigh wave dispersion velocities
Author :
Nenadic, Ivan ; Urban, Matthew W. ; Greenleaf, James F.
Author_Institution :
Dept. of Physiol. & Biomed. Eng., Mayo Clinic Coll. of Med., Rochester, MN, USA
Abstract :
A noninvasive technique capable of characterizing material properties of the heart would be highly beneficial in clinical settings. Our group has been investigating the feasibility of using the Shearwave Dispersion Ultrasound Vibrometry (SDUV) method to estimate tissue viscoelasticity. Dispersion equations for the anti-symmetric Lamb and Rayleigh waves were derived and fitted to the experimental data to solve for elasticity and viscosity of the excised myocardium. The viscoelastic parameters obtained using the two methods agree within one standard deviation. The results suggest that the material properties of the myocardium can be obtained using both Lamb and Rayleigh wave excitation methods.
Keywords :
Rayleigh waves; biomechanics; biomedical measurement; biomedical ultrasonics; cardiology; dispersion (wave); elasticity; muscle; surface acoustic waves; viscoelasticity; viscosity; Lamb wave dispersion velocity; Lamb wave excitation method; Rayleigh wave dispersion velocity; Rayleigh wave excitation method; antisymmetric Lamb wave; heart; myocardium; noninvasive technique; shearwave dispersion ultrasound vibrometry; standard deviation; tissue viscoelasticity; viscoelastic parameters; viscosity; Dispersion; Elasticity; Material properties; Mechanical factors; Mechanical variables measurement; Myocardium; Noninvasive treatment; Ultrasonic variables measurement; Velocity measurement; Viscosity;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441411
