To investigate the damage of DNA in human early chorionic villus cells in uterus induced by diagnostic ultrasound and evaluate the method used for detection of strand breaks in human DNA.

• 目的 :探讨诊断超声经腹照射子宫内胚胎是否引起人早孕绒毛细胞的 DNA链的损伤及评价检测DNA单、双链断裂的方法。