PET/CT职业照射的剂量估算与分析

[目的]介绍正电子发射型计算机断层显像（PET）/计算机断层扫描（CT）应用中职业照射剂量估算方法及辐射防护措施,为评价和技术审评提供参考。[方法]参照国际原子能机构（IAEA）58号技术文件和美国医学物理学家协会（AAPM）108工作组的报告,以某医院PET/CT中心为例,分析辐射源项和工作流程,细化参数,分别估算工作人员各操作岗位的年受照剂量,结合轮岗情况给出年剂量。[结果]该中心工作人员分装、注射、摆位和控制室操作等岗位的年受照剂量分别为0.06、0.14、7.00、0.36 mSv,在轮岗情况下年受照剂量约为1.9 mSv,手部当量剂量为340 mSv。[结论]工作人员应实行轮岗制度,加强分装、注射、摆位环节的辐射防护。

Estimation and Analysis of Occupational Radiation Dose from PET/CT

[ Objective ] To describe a calculation method to estimate occupational radiation doses from positron emission tomography/computed tomography （PET/CT） scanners and propose protective measures against radiation, and to provide references for evaluation and technique appraise. [ Methods ] According to the IAEA （International Atomic Energy Agency） Safety Report Series No.58 and the AAPM （American Association of Physicists in Medicine） Task Group 108 Report, a PET/CT center in a hospital was selected to identify radiation sources, diagnosis processes, and other relevant parameters. The annual exposure dose of staff at each operational location and of rotation staff were estimated. [ Results ] The annual doses of the staff at operational locations of packing, injection, positioning, and control room in the center were 0.06, 0.14, 7.00, and 0.36mSv, respectively. The average dose for rotation staffwas about 1.9mSv. The band equivalent dose was about 340mSv. [ Conclusion ] A job rotation system should be implemented to the staff, and radiation protection should be strengthened in locations like packing, injection, and positioning.