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超声诊断法涉及组织学、声学、电子学等多种学科.本文就超声波的物理学基础及成像原理简介如下.1 超声波的定义物体振动即可产生“声”,产生声的物体叫声源,声由声源以纵向形式在介质中向四周传播.物体每秒钟振动的次数叫频率,频率在每秒2万次以下的声波,人类耳朵可以感知,统称声波.振动频率在每秒2万次以上的声波,人耳不能感知,统称超声波.临床诊断上使用的超声波频率在2.5～15Mhz.所以超声波是高频率的声波.
Ultrasound diagnosis involving histology, acoustics, electronics and other disciplines.In this paper, the basic principles of ultrasound and imaging physics are as follows.1 The definition of ultrasonic vibration can produce objects, “sound”, the sound of objects called sound source, The sound from the sound source to the longitudinal form of the media to the surrounding spread.The number of objects per second vibration frequency, the frequency of 20000 times per second below the sound waves, the human ear can be perceived, collectively referred to as sound wave vibration frequency at 20,000 per second Times more than the sound waves, the human ear can not be perceived, collectively referred to as ultrasound. Clinical diagnosis of the use of ultrasonic frequency 2.5 ~ 15Mhz. So ultrasound is a high frequency sound waves.