^(18)F-FDG PET显像中受检者周围人员的辐射剂量监测

Measurement and evaluation of personal radiation dose during ^(18)F-FDG PET imaging

目的 为1 8F 脱氧葡萄糖 (FDG)PET显像过程中工作和陪护人员的临床辐射防护提供参考数据。方法 用辐射剂量仪分别测量 30例工作人员在注射室、显像室的剂量当量率及受检者注射1 8F FDG后即刻、1和 2h距前胸 0 1、0 5、1 0、2 0m的剂量当量率 ,计算每例检查每一步操作的剂量当量和各工作场所工作人员的年剂量当量。结果 工作人员每例各步操作平均个人剂量当量为药品分装 :左手 (30 0± 8 0 ) μSv,右手 (6 0± 1 5 ) μSv ,全身 (0 5± 0 1) μSv;注射 :手部 (3 0 0± 0 75 )μSv,全身 (1 2 7± 0 2 0 ) μSv ;摆位和采集 ,结束采集共 (9 9± 1 4 ) μSv;密切接触的陪护人员为 (310±91) μSv。各工作场所工作人员的累计年剂量当量分别为 :药品分装及注射 :左手 (16 6 3± 4 4 1)mSv,右手 (6 4 5± 1 2 3)mSv ,全身 (1 18± 0 15 )mSv;显像采集 :全身 (4 99± 0 70 )mSv。结论 通过现有防护设施和方法 ,工作人员和陪护人员的受照剂量均未超过国家辐射安全标准 (GBSS)关于职业及公众个人年剂量限值。

Objective To measure and evaluate the personal radiation dose for medical staff and patient accompanying persons in PET imaging, in order to offer the reference data for clinical radiation protection. Methods Analysis of γ-ray radiation dose rate was performed on 30 medical staff members by using radiation dose meter during each medical procedure in injection room and scanning room, and the instantaneous, 1 and 2 h dose rate at 0.1, 0.5, 1.0 and 2.0 m from the mid-thorax of the patient received injection of the isotope were also measured. Then the mean dose per medical procedure per person and the assuming annual dose at different working sites were all calculated. Results The mean personal doses per procedure were: left hand (30.0±8.0) μSv, right hand (6.0±1.5) μSv, whole-body (0.5±0.1) μSv for syringe preparation; hand (3.00±0.75) μSv, whole-body (1.27±0.20) μSv for injection; (9.9±1.4) μSv for imaging operation; (310±91) μSv for close contact accompanying persons. Annual dose for staff members working in different sites were: left hand (16.63±4.41) mSv, right hand (6.45±1.23) mSv, whole-body (1.18±0.15) mSv in the injection room; whole-body (4.99±0.70) mSv in the imaging room. Conclusion Under the normal operational conditions, the dose received by staff members and accompanying persons do not exceed the annual limit for professional and non-professional persons that has published as GuoBiao safe standard (GBSS).