介入放射学设备参考点剂量显示值与实测值的比较与评估研究  

Comparison and evaluation of dose at reference point between the displayed value and measured value of interventional radiology equipment

作　　者：徐辉[1] 岳保荣[1] 赵锡鹏[1] 孙全富[1] XU Hui;YUE Baorong;ZHAO Xipeng;SUN Quanfu(National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Key Laboratory of Radiological Protection and Nuclear Emergency,China CDC.Beijing 100088 China)

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中国辐射卫生》2020年第6期607-610,614,共5页Chinese Journal of Radiological Health

基　　金：2017年卫生标准制修订项目(20170809)。

摘　　要：目的通过测量介入放射学设备透视时的介入参考点剂量和设备显示剂量的关系,验证设备显示剂量的准确性,评估使用显示介入参考点剂量来指导医师进行辐射防护最优化的合理性。方法选择两台不同品牌的平板探测器介入放射学设备,分别记录为设备A和设备B。分别将30 cm×30 cm,厚20 cm的PMMA模体和不同厚度铜板组合,放置在平板探测器一侧,使用unfors Xi剂量仪的RF探头测量介入参考点位置的剂量率,比较介入参考点位置入射剂量测量值与设备显示值。使用不同厚度模体测量介入参考点的剂量率,拟合每m A·min输出量与kV的关系。结果对于设备A,设备显示剂量率和现场实测剂量率的偏差在6%以内;而对于设备B,设备显示剂量率和现场实测剂量率的偏差达到85.6%及以上。设备每mA·min输出量,与kV成幂指数关系。结论介入放射学医技人员应该意识到介入放射学的X射线系统所显示的参考剂量的准确性,对介入放射学设备定期进行验证和质量控制,以保证显示剂量的准确性和可参考性。介入医师和技师可以利用设备显示剂量估计患者体表受照剂量的水平,避免患者发生确定性效应。Objective By measuring the relationship between the reference point dose and the display dose of interventional radiology equipment in fluoroscopy mode, the accuracy of the display dose of equipment was verified, and the rationality of using the display reference point dose to guide physicians to optimize radiation protection was evaluated. Methods Two different brands of flat panel detectors for interventional radiology equipment were selected and recorded as device A and Device B respectively. A 30 cm × 30 cm and 20 cm thick PMMA phantom and copper plates of different thickness were combined and placed on one side of the plate detector. The RF detector of unfors Xi dosimeter was used to measure the dose rate at the reference point position, and compare the incident dose at the reference point with the displayed value. Different thickness phantom were used to measure the dose rates of the interventional reference points, and the relationship between the output per mA·min and kV was fitted. Results For device A, the deviation between the dose rate displayed and the measured dose rate in the field was within 6%. For device B, the deviation between the dose rate displayed and the measured dose rate in the field reached 85.6% or more. The output of each mA·min of the device has a power exponential relation with kV. Conclusion Medical technicians in interventional radiology should be aware of the accuracy of the reference dose displayed by their X-ray systems for interventional radiology, and periodically verify and control the quality of the interventional radiology equipment to ensure the accuracy and referability of the displayed dose. Interventional physicians and technicians can use the displayed dose to roughly estimate the level of the exposed dose on the patient’s body surface to avoid the patient’s deterministic effect.

关 键 词：介入放射学 介入参考点 辐射剂量 辐射剂量学 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]