Zargan S, Ghafarian P, Shabestani Monfared A, Sharafi A A, Bakhshayeshkaram M, Ay M R
Department of Medical Physics, Babol University of Medical Sciences, Babol, Iran.
Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Biomed Phys Eng. 2017 Mar 1;7(1):1-12. eCollection 2017 Mar.
PET/CT imaging using [18F]-FDG is utilized in clinical oncology for tumor detecting, staging and responding to therapy procedures. Essential consideration must be taken for radiation staff due to high gamma radiation in PET/CT and cyclotron center. The aim of this study was to assess the staff exposure regarding whole body and organ dose and to evaluate environment dose in PET/CT and cyclotron center.
80 patients participated in this study. Thermoluminescence, electronic personal dosimeter and Geiger-Muller dosimeter were also utilized for measurement purpose.
The mean annual equivalent organ dose for scanning operator with regard to lens of eyes, thyroid, breast and finger according to mean±SD value, were 0.262±0.044, 0.256±0.046, 0.257±0.040 and 0.316±0.118, respectively. The maximum and minimum estimated annual whole body doses were observed for injector and the chemist group with values of (3.98±0.021) mSv/yr and (1.64±0.014) mSv/yr, respectively. The observed dose rates were 5.67 µSv/h in uptake room at the distance of 0.5 meter from the patient whereas the value 4.94 and 3.08 µSv/h were recorded close to patient's head in PET/CT room and 3.5 meter from the reception desk.
In this study, the injector staff and scanning operator received the first high level and second high level of radiation. This study confirmed that low levels of radiation dose were received by all radiation staff during PET/CT procedure using 18F-FDG due to efficient shielding and using trained radiation staff in PET/CT and cyclotron center of Masih Daneshvari hospital.
使用[18F]-FDG的PET/CT成像在临床肿瘤学中用于肿瘤检测、分期及评估治疗效果。由于PET/CT和回旋加速器中心存在高伽马辐射，必须对辐射工作人员给予必要的考虑。本研究的目的是评估工作人员的全身和器官剂量暴露，并评估PET/CT和回旋加速器中心的环境剂量。
80名患者参与了本研究。还使用了热释光、电子个人剂量计和盖革 - 弥勒剂量计进行测量。
扫描操作员眼睛晶状体、甲状腺、乳腺和手指的平均年等效器官剂量，根据均值±标准差分别为0.262±0.044、0.256±0.046、0.257±0.040和0.316±0.118。注射人员组和化学师组观察到的最大和最小估计年全身剂量分别为(3.98±0.021) mSv/年和(1.64±0.014) mSv/年。在摄取室距离患者0.5米处观察到的剂量率为5.67 µSv/小时，而在PET/CT室靠近患者头部处以及距离接待台3.5米处记录的值分别为4.94和3.08 µSv/小时。
在本研究中，注射人员和扫描操作员接受的辐射水平分别为第一高和第二高。本研究证实，由于在马西赫·达内什瓦里医院的PET/CT和回旋加速器中心采用了有效的屏蔽措施并配备了训练有素的辐射工作人员，所有辐射工作人员在使用18F-FDG进行PET/CT检查过程中所接受的辐射剂量较低。
