超声的应用已经成为临床诊断的一个通用手段,尤其在产科领域的应用越来越多。一般认为诊断水平的超声波对正在发育的胎儿无影响。一些报道未能证明诊断剂量的超声波对人类染色体的有害作用。最近在姊妹染色单体互换(sister chromatid ex-changes,简称SCE,是一种直接反映染色体损害的敏感指标)发生频率方面的研究,结果出现了争议。这可能基于若干因素,诸如细 The application of ultrasound has become a common means of clinical diagnosis, especially in the field of obstetrics more and more applications. The diagnostic level of ultrasound is generally considered to have no effect on the developing fetus. Some reports failed to demonstrate the harmful effects of diagnostic doses of ultrasound on human chromosomes. The recent controversy over the frequency of sister chromatid ex-changes (SCE, a sensitive indicator that directly reflects chromosomal damage) occurs. This may be based on several factors, such as fineness