Al-Haj Abdalla N, Lobriguito Aida M, Arafah Ahnaf, Parker Ruchana
Biomedical Physics Department, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
Radiat Prot Dosimetry. 2011 Mar;144(1-4):487-91. doi: 10.1093/rpd/ncq452. Epub 2010 Dec 8.
The introduction of PET/CT at King Faisal Specialist Hospital and Research Centre for whole body and brain imaging has become favourable for diagnosis of cancer. There is no data available on the PET/CT dose to staff and members of the public for different activities of (18)F [fluorodeoxyglucose (FDG)] and for longer patient holding time. The study aims to determine and evaluate staff and public doses by using thermoluminescent dosemeters monthly readings for a 7-month deployment period and by using direct measurements of dose rates at 30 cm and 1 m distances from the patients after injection. The whole body doses per procedure and per administered activity of (18)F (FDG) were estimated. A dose map inside the PET/CT was generated to provide information of the dose levels in different locations. The Pearson correlation showed a strong correlation (r(2) = 0.71) between the dose per activity and the number of patients. Optimisation of radiation protection of staff and members of the public was investigated and recommendations were given.
法赫德国王专科医院及研究中心引入正电子发射断层显像/X线计算机体层成像（PET/CT）用于全身和脑部成像，对癌症诊断颇为有利。目前尚无关于不同活度的（18）F[氟脱氧葡萄糖（FDG）]以及更长患者等待时间下，PET/CT对工作人员和公众剂量的数据。本研究旨在通过在7个月的部署期内每月使用热释光剂量计读数，并在注射后在距离患者30厘米和1米处直接测量剂量率，来确定和评估工作人员及公众的剂量。估算了每次检查以及每次给予（18）F（FDG）活度时的全身剂量。生成了PET/CT内部的剂量分布图，以提供不同位置的剂量水平信息。皮尔逊相关性分析显示，每次活度的剂量与患者数量之间存在强相关性（r² = 0.71）。研究了工作人员和公众辐射防护的优化措施并给出了建议。
