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采用临床诊断Ｂ超（常用探头频率３．５ＭＨｚ和最大频率５．０ＭＨｚ）对拟行引产的中孕（孕１６～２６周）妇女（实验组）行腹部超声照射１０ｍｉｎ，２０ｍｉｎ，随后行水囊引产术，抽取引产胎儿骨髓，比较各组骨髓象，观察各组骨髓细胞的超微结构，并与未行Ｂ超照射的引产胎儿（对照组）进行比较，以探讨诊断超声的安全性。结果：各实验组与对照组之间，骨髓细胞的超微结构及骨髓象均无差别。提示：目前产科常用诊断剂量超声未引起中孕胎儿骨髓细胞形态学的改变
The clinical diagnosis of B ultrasound (probe frequency of 3.5MHz and the maximum frequency of 5.0MHz) of the second trimester (16-26 weeks pregnant women) (experimental group) abortion ultrasound irradiation 10min, 20min, followed by water sac Induction of labor, abortion fetus fetus bone marrow extraction, compare the bone marrow of each group, observe the ultrastructure of bone marrow cells of each group, and without B-irradiation fetus fetus (control group) were compared to explore the safety of diagnostic ultrasound. Results: There was no difference between the experimental group and the control group in the ultrastructure of bone marrow cells and bone marrow. Tip: At present, ultrasound diagnosis of common obstetric ultrasound did not cause pregnancy in fetal bone marrow cell morphology changes