一、引 言 超声波在医学临床中的应用可分为诊断与治疗两大类.用于诊断的超声波只作为信息的载体,把超声波射入人体的目的,是通过它与人体组织之间的相互作用获取有关生理与病理的信息,而不给人体留下任何影响.为此,常常使用几十mW/cm~2以下的低强度超声.用于治疗时,超声波则作为一种能量形式,把它射入人体的目的,则是要通过它与人体组织的相互 I. INTRODUCTION The application of ultrasound in medical clinic can be divided into two categories: diagnosis and treatment.Ultrasonic for diagnosis is only used as information carrier, the purpose of injecting ultrasound into human body is through its interaction with body tissue Obtaining information about the physiology and pathology without leaving any impact on the human body To do this, low-intensity ultrasound, often in the tens of mW / cm 2 or less, is often used, and when used in therapy, ultrasound is treated as an energy form The purpose of injection into the body, it is through it and the human body tissue mutual