一、序言测量时间平均的声输出功率是医疗超声领域中急迫而重要的问题。实际上,为了实现毫瓦级和微瓦级的超声剂量测定法,对测量系统提出了更高的要求。辐射力法提供了解决这个问题的适当方法。已经发表了几种测量超声功率级的仪器,例如 Oberst 等(1952)用于诊断的装置。Wells等(1963)测量了声束撞击浸没在水中的天平 I. INTRODUCTION Measuring the time-averaged acoustic output power is an urgent and important issue in the medical ultrasound field. In fact, in order to achieve milliwatt and micro-watt ultrasonic dosimetry, measurement systems put forward higher requirements. The radiation method provides an appropriate solution to this problem. Several instruments have been published that measure ultrasound power levels, such as Oberst et al. (1952) for diagnostic devices. Wells et al. (1963) measured the sound pressure impact on the balance immersed in water