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[目的]通过调查和测量计算江苏省乳腺X射线摄影受检者乳房压缩厚度(compressed breast thickness,CBT)和腺体平均剂量(average glandular dose,AGD),了解江苏省乳腺X射线摄影的AGD分布情况及影响因素。[方法]抽样调查来自江苏省5城市17个医疗机构中17台次340个乳腺X射线摄影的曝光参数,使用X线质量控制检测仪测量其入射体表空气比释动能(entrance surface air kerma,ESAK)。使用国际通用方法计算AGD,并分析其与CBT等因素的关系。[结果]在抽取的340个乳腺X射线摄影参数中,AGD均数为1.66 mGy。CBT服从正态分布,均数和标准差分别为4.22 cm和1.12 cm。两种不同体位(侧斜位、头尾位)的CBT差异有统计学意义(t=-3.481,P<0.05),两种体位的AGD水平差异无统计学意义(t=-0.791,P>0.05)。[结论]CBT可能通过不同机制影响AGD水平,可为建立适合我国乳腺X射线摄影受检者剂量指导水平提供依据。
[Objective] To investigate the AGD distribution of mammography in Jiangsu Province through the investigation and measurement of compressed breast thickness (CBT) and average glandular dose (AGD) of mammography subjects in Jiangsu Province. Situation and influencing factors. [Methods] The exposure parameters of 340 340 mammography radiographs from 17 medical institutions in 5 cities of Jiangsu Province were surveyed. The X-ray quality control detector was used to measure the incident air surface air kerma ESAK). Calculate AGD using international methods and analyze its relationship with CBT and other factors. [Results] Among the 340 mammographic parameters extracted, the mean AGD was 1.66 mGy. CBT obey normal distribution, mean and standard deviation were 4.22 cm and 1.12 cm respectively. There were significant differences in CBT between the two groups (t = -3.481, P <0.05). There was no significant difference in AGD between the two positions (t = -0.791, P> 0.05). [Conclusion] CBT may affect the level of AGD through different mechanisms, which may provide the basis for establishing the dose guidance level suitable for mammography in our country.