论文部分内容阅读
绪言超声波诊断装置,是从超声波探头发穿射超声波,并将其传入生物体内,然后再返回超声波探头,经各种处理对疾病进行超声诊断的一种装置。由于超声波诊断方法对妊娠中的胎儿有广泛的用途,因此,有必要对其安全性进行充分的研究。超声波存在于较宽的频率范围内,其发生及应用方法,亦根据超声频率的不同而有差异。数10kHz的超声波在空气中传播,有各种各样的实际应用。由于超声波的强度在
INTRODUCTION Ultrasound diagnostic device is a device that sends ultrasonic waves from an ultrasonic probe and sends it into a living body and then back to the ultrasonic probe to diagnose the disease through various treatments. Due to the wide range of uses of ultrasound in the diagnosis of fetuses in pregnancy, it is necessary to fully study their safety. Ultrasound exists in a wide range of frequencies, its occurrence and application methods, but also according to the different ultrasonic frequencies are different. A few 10 kHz of ultrasonic waves are transmitted in the air and have a variety of practical applications. Because of the intensity of the ultrasound