这个我从专业人士方面说一下吧。 在美国对妇女的mammography检查是Federally

controlled! 您说的那种情况极其少见！可以负责任地告诉你，做这个国家，各个洲，监控很严。

Do a search about MQSA (mammography quality standard act) you will find a lot more information about the breast cancer program. Mind you, it is the ONLY federally mandated and closely watched program, which has been a tremendous help for women health.