Abstract: A sound reproducing screen for an ultrasonic converting and reproducing method wherein a sound signal is carried on the ultrasonic wave which is transmitted via the screen which has a lattice structure in which a plurality of cells is continuously arranged. Using the screen, the sound signal can be divided from the ultrasonic wave, so that the sound signal can be reproduced. A cell structure of the screen is thus provided for converting the ultrasonic wave into the sound signal by ultrasonic conversion and reproduction which is simple to make and which has a maximum conversion efficiency. Accordingly, an efficiency of reproducing the sound source in a low frequency band as well as a high frequency band is superior, and a realistic three-dimensional sound system can be implemented.

Abstract: A sound reproduction screen includes: at least one cell including a vibrator which receives and is vibrated by an ultrasonic signal carrying an audible signal, and a medium which has nonlinear response characteristics with respect to a vibration of the vibrator; and a screen containing the at least one cell which is distributed in a matrix structure, wherein the vibrator of the cell includes an elastic body that is vibrated by the ultrasonic signal and reflects the audible signal separated from the ultrasonic signal according to the nonlinear response characteristics of the medium, and an asymmetrical body that is connected with the elastic body and vibrates in the medium.

Abstract: A sound reproduction screen includes: at least one cell including a vibrator which receives and is vibrated by an ultrasonic signal carrying an audible signal, and a medium which has nonlinear response characteristics with respect to a vibration of the vibrator; and a screen containing the at least one cell which is distributed in a matrix structure, wherein the vibrator of the cell includes an elastic body that is vibrated by the ultrasonic signal and reflects the audible signal separated from the ultrasonic signal according to the nonlinear response characteristics of the medium, and an asymmetrical body that is connected with the elastic body and vibrates in the medium.

Abstract: A method and devices for Shear Wave Elasticity Imaging (SWEI). The method employs a focused acoustic pulse which remotely induces a shear wave in tissue. The values of the shear modulus and dynamic shear viscosity of tissue are evaluated from the values of propagation parameters of shear acoustic waves detected by various means including Doppler ultrasound and Magnetic Resonance Imaging. Several devices for carrying out the method are described. Devices based on the method can be used as a diagnostic tool in the detection of abnormalities in tissue, such as those caused by cancer or other lesions and characterizing processes in tissues accompanied by changes in their mechanical properties. The devices can also be used for assessment of brain tissue and evaluation of the biomechanical state of muscle.