脉冲回波超声波在产科中有很重要的应用,一般认为,使用脉冲超声比较安全,对胎儿没有影响.这种观点的根据在于:(1)通常所用的超声波强度很小,不足以在所照射的生物组织中产生有效的温升;(2)隐含假定:所用的声脉冲很短,不足以产生空化现象. 有人认为,近年来的研究结果表明,有必要注意毫秒量级长度的脉冲超声产生空化的可能性.邱尔特(S·Z·Child)等人的工作表明,低的时间平均强度的脉冲超声可以杀死Drosophila幼虫;生物体对超声波 Pulse echo Ultrasound in the obstetrics is very important application, generally believed that the use of pulsed ultrasound is relatively safe, no effect on the fetus This view is based on the following: (1) usually used in the intensity of ultrasound is small enough to be irradiated (2) The implicit assumption is that the acoustic pulse used is short enough to cause cavitation Some people think recent research shows that it is necessary to pay attention to pulses of millisecond length Possibility of cavitation by ultrasound. Work by S.Z. Child et al. Shows that pulsed ultrasound with low temporal average intensity can kill Drosophila larvae; organisms that respond to ultrasound