Ramanathan Vijitha, Gamage S P, Karunathilaka Uiu, Wickramasinghe Wmis, Tudugala Ranga
Department of Radiography & Radiotherapy, Faculty of Allied Health Sciences, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka.
University Hospital Southampton, NHS Foundation Trust, Southampton, United Kingdom.
J Radiol Prot. 2024 Dec 27;44(4). doi: 10.1088/1361-6498/ad9f72.
Extremity radiation exposure in nuclear medicine is a growing concern because it may surpass the maximum permissible dose of 500 mSv. This study aimed to assess the occupational finger dose received by technologists during the preparation and administration ofF-FDG radiopharmaceuticals in positron emission tomography-computed tomography (PET-CT) whole-body scan procedures. Fifty scans were selected, with one procedure excluded due to a high administered activity. The mean administered activity per scan was 207.2 ± 41.8 MBq, with preparation and administration times averaging 1.44 ± 1.30 min and 0.46 ± 0.31 min, respectively. The technologist's mean total finger dose received during preparation and administration was 253.5 ± 153.3 Sv per procedure. A significant positive correlation was found between the administered activity and occupational dose, with patient's body mass index, preparation time, and administration time also contributing to dose variation. Based on 703 PET-CT procedures conducted in 2022, the estimated occupational finger dose for a technologist was 178.2 mSv annually. This value is well below the International Commission on Radiological Protection's maximum permissible dose of 500 mSv. The findings of this study have a significant impact on extremity dosimetry in nuclear medicine in Sri Lanka, as this is the first study of its kind.
核医学中肢体辐射暴露问题日益受到关注，因为其可能超过500毫希沃特的最大允许剂量。本研究旨在评估技术人员在正电子发射断层扫描 - 计算机断层扫描（PET - CT）全身扫描程序中制备和施用氟代脱氧葡萄糖（F - FDG）放射性药物期间所接受的职业手指剂量。选取了50次扫描，其中1次因给药活度高而被排除。每次扫描的平均给药活度为207.2±41.8兆贝可，制备和给药时间分别平均为1.44±1.30分钟和0.46±0.31分钟。技术人员在制备和给药期间接受的平均总手指剂量为每次程序253.5±153.3微希沃特。给药活度与职业剂量之间存在显著正相关，患者体重指数、制备时间和给药时间也会导致剂量变化。基于2022年进行的703次PET - CT程序，估计技术人员的职业手指年剂量为178.2毫希沃特。该值远低于国际放射防护委员会规定的500毫希沃特的最大允许剂量。本研究结果对斯里兰卡核医学中的肢体剂量测定具有重大影响，因为这是同类研究中的首例。
