透环
透环-
育龄妇女X线透环时受照剂量的调查
Survey of exposure dose received by women of reproductive age during IUD fluoroscopy
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异常血管征及透环征出现频率较高（占80%以上）。
The rate of abnormal blood vessel sign and lucency loop reached 80 % above .
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本文报道北京市医疗照射剂量调查中，有关X线透视检查育龄妇女宫内节育器（俗称透环）所致受检者的体表照射量及其分布情况。
This paper reports the surface exposure and its distribution of the women from intrauterine device fluoroscopy in Beijing .