抄録
Magnetic Resonance Elastgraphy is one of the method for early diagnosis for cancers in which elastic modulus is measured by visualizing propagation of waves in the body with MRI. In this study, aiming to establish a remote generation method of wave in a human body for an inspection of a focus, a fundamental mechanism of remote-vibration generation is investigated. We introduced a model that consists of a mass-damper-spring system subjected to periodic force and a bar in which wave propagates from the mass-spring system to a flexible body in which wave is generated. Based on the analytical result, it was found that wave can be generated robustly with relatively large amplitude under the conditions that the dimension of the vibrating plate, which radiates the wave, is larger enough than the wavelength, and that the product of natural sound impedance of a bar and cross-sectional area is equivalent to the damping coefficient of wave radiation, and that the resonance of spring-mass system is induced which generates vibration, and that the damping coefficient of the spring-mass system is chosen as same value as the equivalent damping coefficient of the wave radiation.
