广东省MDCT机所致受检者剂量水平初探

目的 了解广东省MDCT机所致受检者辐射剂量水平。方法 采用分层随机抽样方法，选取广东省24台MDCT机进行医疗照射剂量水平调查，分析广东省MDCT检查所致受检者的辐射剂量水平。结果 成人头部、成人胸部、成人腹部、成人脊柱、成人四肢、成人冠脉的加权CT剂量指数的均值分别为44.5、15.4、20.0、23.4、16.9、38.2 mGy，而相应的剂量长度乘积的均值分别为776、482、693、691、539、1056 mGy·cm；儿童头部、儿童胸部、儿童腹部的加权CT剂量指数的均值分别为20.9、9.6、15.1 mGy，而相应的剂量长度乘积的均值分别为257、167、472 mGy·cm。结论 调查数据可以促进对受检者的剂量控制，以更好推动辐射防护最优化。

A perliminary study on the radiation dose levels due to MDCT examination in Guangdong Province

Objective To know the radiation dose levels subjects caused by MDCT examination in Guangdong Province.Methods A stratified random sampling method was used to investigate the medical exposure dose level by selected 24 MDCT machines in Guangdong Province.Results The adult's means weighted CT dose indices of head, chest, abdomen, spine, limbs and coronary head, chest, abdomen, spine, limbs and coronary were 44.5 mGy, 15.4 mGy, 20.0 mGy, 23.4 mGy, 16.9 mGy and 38.2 mGy,respectively, while the mean values for the corresponding dose length product were 776 mGy·cm, 482 mGy·cm, 693 mGy·cm, 691 mGy·cm, 539 mGy·cm, 1056 mGy·cm, respectively. The children's means weighted CT dose index for head, chest and abdomen were 20.9 mGy, 9.6 mGy and 15.1 mGy, respectively, while the mean values for the corresponding dose length product was 257 mGy·cm, 167 mGy·cm and 472 mGy·cm, respectively.Conclusion The survey data can promote the dose control of the subjects, so as to better promote the optimization of radiation protection.