Under the vibration radiation force the tissue in the confocal volume will vibrate along the acoustic axial, and emit low-frequency wave toward the surroundings, this is named ultrasound stimulated acoustic emission (USAE).

• 共焦区组织在振动辐射力的作用下沿入射波的声轴来回振动,向周围发射低频波信号,这就是超声激发声发射(USAE)信号。