PET-CT受检者周围剂量水平检测与分析  

The detection and analysis of dose level for ambient of the patient received PET-CT examination

作　　者：练德幸 张庆召 张奇 梁婧 朱卫国 葛丽娟 侯长松 张震 

机构地区：[1]辐射防护与核应急中国CDC重点实验室中国CDC辐射防护与核安全医学所,北京100088

出　　处：《中国医学装备》2017年第7期44-47,共4页China Medical Equipment

基　　金：国家重大科学仪器设备开发专项(2012YQ180118)"大批量人群核辐射体内污染快速检测仪"

摘　　要：目的:分析在正电子发射计算机断层显像-CT(PET-CT)检查过程中受检者注射放射性药物后不同时间和不同距离处的周围剂量当量率水平,评估PET-CT检查过程中的辐射防护要点。方法:选取接受PET-CT检查的20例受检者,搭建快速测量平台,测量中采用延长导线将便携式γ周围剂量当量率仪的实时数据传送到笔记本电脑客户端中,远距离实时记录测量结果,测量受检者注射药物^(18)F-氟代脱氧葡萄糖(^(18)F-FDG)后不同时间、距受检者不同方向及不同距离处的周围剂量当量率。结果:20例受检者在注射^(18)F-FDG后体表1 m处的周围剂量当量率为15.1~33.9μSv/h,PET-CT检查后降至7.47~20.2μSv/h,下降幅度为40.8%~78.3%;在测量方向上,受检者的胸前和背部的周围剂量当量率高于受检者左右两侧的周围剂量当量率;在不同距离上,受检者1 m处的周围剂量当量率较0.5 m处下降3倍左右。结论:在PET-CT检查过程中,受检者注射放射性药物^(18)F-FDG后,其周围辐射水平较高,为减少相关人员的受照剂量,应加强对陪护者的防护及对注射药物后的受检者的管理。Objective： To grasp the level of dose equivalent rate for ambient of patients at different time and different distance after they were injected radiopharmaceuticals during the detection of PET-CT, and evaluate the key point of protection during the process of detection. Methods： 20 patients received detection of PET-CT were selected and a fast measurements platform was established. In the measurement, the real time data of portable instrument of γ ambient dose equivalent rate were sent to client of laptop by extended wire. And the results of detection could be real time recorded on remote. The ambient dose equivalent rates of different time, different direction and different distance were detected after the patients were injected ^18F-FDG. Results： The range of ambient dose equivalent rate was 15.1μSv/h-33.9μSv/h when the distance was 1m between detected point and patients who were injected ^18F-FDG, and then the rate decreased to 7.47μSv/h-20.2μSv/h after PET-CT detection finished. This meant its descend amplitude was 40.8%-78.3%. On the direction of detection, the ambient dose equivalent rate of prethorax and backside of patients were higher than the left and right side of them. For different distance, the ambient dose equivalent rate of 0.5m away from patients was rough 3 times of that of 1m away from patients. Conclusion： During the detection of PET-CT, the ambient dose equivalent was higher than normal level after patients were injected ^18F-FDG, therefore, the protection for caretakers and the management for patients injected ^18F-FDG should be strengthened so as to reduce the radiation dose on related personnel.

关 键 词：正电子发射计算机断层显像-CT 周围剂量当量率 辐射防护 ^18F-氟代脱氧葡萄糖 

分 类 号：R146[医药卫生—公共卫生与预防医学]