Fundamental Investigation of Shear and Surface Elastic Waves in Soft Biological Tissues by Numerical Simulation

概要

論文の詳細を見る
To investigate the possibility of applying a shear or surface wave to ultrasonic diagnosis, fundamental examination of wave generation and propagation characteristics in soft biological tissues is performed by means of numerical analysis. Assuming that tissues are isotropic, the elements of the elastic constant tensor [c] and the viscosity coefficient tensor [η] of tissues are chosen as c_<11>=10^9 N/m^2, c_<44>=10^5 N/m^2, and η_<11>=1.0 N・s/m^2 and η_<44>=0.01 N・s/m^2, respectively. The constants are assumed to be independent of frequency. By the finite-difference time domain method formulated in an explicit manner, the generation and propagation of the shear and surface waves at low frequency (50 kHz) are confirmed in a 2-dimensional homogeneous medium surrounded by a free boundary in a region in which a vibrational source exists.
社団法人応用物理学会の論文
1995-05-30