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查阅了约30000个病案记录,找出在1925年至1954年间从马萨诸塞州12个医院出院的被诊断为肺TB的女性患者.经过筛选,最后共选定4940例患者,其中受照组2573例,对照组2367例.受检者每次接受荧光透视检查的平均持续时间为15秒,其中受检者正面朝向球管方向的时间占25%,患者累积吸收剂量范围为0.01～6.4Gy(平均0.79Gy);而未进行任何胸部X射线检查的患者累积剂量低于0.01Gy.这些妇女首次接受X射线透视检查时的平均年龄26岁;出院时平均年龄27.2岁,出院日期至病情跟踪结束的平均时间为30.4年,患乳腺癌危险的平
Approximately 30,000 medical records were reviewed to identify women diagnosed with pulmonary TB who were discharged from 12 hospitals in Massachusetts from 1925 to 1954. After screening, a total of 4,940 patients were selected, of whom 2573 , Control group 2367. Subjects undergoing fluoroscopy for an average duration of 15 seconds, of which subjects were facing the direction of the tube for 25% of the time, the patient cumulative absorbed dose range of 0.01 ~ 6.4Gy (average 0.79 Gy), while those who did not undergo any chest X-ray had a cumulative dose of less than 0.01 Gy. The mean age at first X-ray fluoroscopy for these women was 26 years of age, mean age at discharge was 27.2 years, and discharge date to the end of disease follow-up The average time was 30.4 years, with a risk of breast cancer