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目的通过了解河北省多排探测器CT(MDCT)扫描患者辐射剂量现状,为做好患者剂量控制和管理工作提供科学依据。方法按照国家标准GB 17589-2011[5]、GBZ 165-2005[6]规定的方法,对该省MDCT患者头颅、胸部、腹部、腰椎等典型部位的辐射剂量进行调查研究。结果有12台设备头颅CD加权剂量指数(CTDIW)超过了50 m Gy,占总数的13.3%。腹部的最大CTDIW超过了诊断参考水平近2倍。各部位CTDIW最大和最小值相差很大,腰椎相差近20倍。头颅的剂量长度乘积(DLP)最高达1 455 m Gy/cm,是国际原子能机构(IAEA)研究数据的2.8倍,是欧洲MDCT诊断参考水平的4.3倍。64排及以上机型剂量指数整体比16排要低。在其他扫描条件不变时,CT容积剂量指数(CTDIVOL)随m As变化呈正比,随电压增加而增大,随准直宽度的增大而减小,随螺距的增大呈反比下降。结论应按辐射防护正当化和最优化的原则,加强MDCT患者辐射剂量控制及相关人员的技术培训和继续教育。
Objective To understand the status quo of radiation dose in multi-detector CT scanning in Hebei province and provide scientific basis for dose control and management. Methods According to the methods of national standard GB 17589-2011 [5] and GBZ 165-2005 [6], the radiation doses of typical parts of the head, chest, abdomen and lumbar spine of MDCT patients in this province were studied. As a result, CT head-to-head weighted dose index (CTDIW) of 12 devices exceeded 50 m Gy, accounting for 13.3% of the total. The maximum CTDIW in the abdomen is nearly two times the diagnostic reference level. CTDIW various parts of the maximum and minimum values vary greatly, nearly 20 times the lumbar spine. The dose-length product of the skull (DLP) is up to 1 455 m Gy / cm, 2.8 times the IAEA study data and 4.3 times the diagnostic reference level of the European MDCT. 64 rows and above models overall dose index lower than 16 rows. CT volumetric dose index (CTDIVOL) was proportional to m As at other scanning conditions, increasing with increasing voltage, decreasing with increasing collimation width, and decreasing inversely with increasing pitch. Conclusion The radiation dose control and related personnel technical training and continuing education should be strengthened according to the principle of radiation protection justification and optimization.