影响数字乳腺X线摄影辐射剂量因素研究

Study on factors of influence to radiation dose of digital mammography

    摘要
  • 摘要:
    目的 对影响数字乳腺X线摄影辐射剂量的不同靶面/滤过组合以及不同曝光模式进行研究。
    方法 采用西门子MAMMOMAT NovationDR型数字乳腺摄影机，应用不同靶面/滤过组合和不同曝光模式对乳腺体模和X射线用矩形波测试卡进行照射，记录其辐射剂量并观察测试卡显示的线对数，再对临床病例进行对比研究，记录其辐射剂量并观察照片质量有无差别。
    结果 同等X线片质量下，三种不同靶面/滤过组合和两种不同曝光模式的辐射剂量差别较大，在体模试验中，钼靶/钼滤过组合达到2.2 mGy，钼靶/铑滤过组合达到1.5 mGy，而钨靶/铑滤过组合最小，只有1.0 mGy；与自动曝光模式的辐射剂量3.0 mGy相比，手动曝光控制模式的辐射剂量可下降到1.5 mGy。同时，临床病例测试结果与体模测试结果完全相符。
    结论 在实际工作中，应尽量选择手动曝光控制模式和钨靶/铑滤过组合进行摄影，以尽量减少患者的辐射剂量。

     

    Abstract:
    Objective To study different target surface/ filtration combination and exposure modes which are influence factors to digital mammography radiation dose.
    Methods Phantom of breast and rectangular wave test card were exposed to Siemens MAMMOMAT NovationDR digital breast X-ray machine by different target surface/ filtration combines and different exposure modes, radiation dose and line logarithms of test card was obtained. And then comparatively studied with clinical radiation does, observed the different quality of images.
    Results There are significant difference between three different target surface/ filtration combines and two different exposure modes at the same X-ray image quality. The radiation dose of target surface/ filtration combinations of molybdenum/molybdenum, molybdenum/rhodium, and tungsten/ rhodium were 2.2 mGy, 1.5 mGy, and 1.0 mGy in model test, respectively. Compared with 3 mGy of automatic exposure, manual exposure dose decreased to 1.5 mGy. The results of clinical case and model test were completely conformed.
    Conclusion Manual exposure mode and tungsten/rhodium target surface/filtration combination were advised to reduce the radiation dose in clinical application

     

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