Cyclic generation of strain inside object using dual acoustic radiation force

There are many studies on measurement of tissue mechanical properties by applying an acoustic radiation force induced by ultrasound to an object. However, when the elastic modulus of the object is much higher than that of the surrounding tissue (such like a tumor in the breast tissue), an acoustic radiation force might generate only the change in position of the object and the strain of the object is hardly generated. In such cases, mechanical properties of the object cannot be evaluated. In this study, two cyclic acoustic radiation forces are simultaneously applied to an object to effectively generate the strain inside the object even when the object is much harder than the surrounding tissue.