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Personal Radiation Doses In Pet/ct Facility: Measurements Vs. Calculations

机译：宠物/ ct设施中的个人辐射剂量：测量与计算方式

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摘要

The estimation of shielding requirement of a new positron emission tomography (PET) facility is essential. Because of penetrating annihilation photons, not only radiation safety in the vicinity of patients should be considered, but also rooms adjacent to uptake and imaging rooms should be taken into account. Before installing a PET/CT camera to nuclear medicine facilities of Helsinki University Central Hospital (HUCH), a typical PET imaging day was simulated using phantoms. Phantoms were filled with 300 ± 36 MBq of ~(18)F isotope and dose rates were measured at 12 central locations in the laboratory. In addition to measurements, dose rates were also calculated using guidelines of AAPM Task Group 108. The relationship between the measured and calculated dose rates was found to be good and statistically significant, using Pearson's correlation test. The evaluated monthly doses were compared with personal dosemeter readings. AAPM's report gives practical tools for evaluation of radiation shielding. Calculations can be carried out successfully for existing hospital complexes too. However, calculations should be carried out carefully, because especially doors, windows and partitions can easily cause underestimation of shielding requirements as shown in this work.
机译：估算新的正电子发射断层扫描（PET）设施的屏蔽要求至关重要。由于an灭光子的穿透性，不仅应考虑患者附近的辐射安全性，而且还应考虑与摄取室相邻的房间和成像室。在向赫尔辛基大学中心医院（HUCH）的核医学设施安装PET / CT相机之前，使用幻像模拟了典型的PET成像日。幻像充满了300±36 MBq〜（18）F同位素，并在实验室的12个中心位置测量了剂量率。除测量外，还使用AAPM任务组108的准则来计算剂量率。使用皮尔森相关检验，测得的剂量率与计算出的剂量率之间的关系良好且具有统计学意义。将评估的每月剂量与个人剂量计读数进行比较。 AAPM的报告提供了评估辐射屏蔽的实用工具。现有医院综合体的计算也可以成功进行。但是，应谨慎进行计算，因为尤其是门，窗和隔断很容易引起对屏蔽要求的低估，如本工作所示。

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