Department of Medical Physics and Biomedical Engineering (MFT), Sahlgrenska University Hospital, SE-41345 Gothenburg, Sweden.
Department of Medical Radiation Sciences, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Biomed Phys Eng Express. 2024 May 15;10(4). doi: 10.1088/2057-1976/ad470c.
Thermoluminescent dosimeters (TLDs) serve as compact and user-friendly tools for various applications, including personal radiation dosimetry and radiation therapy. This study explores the potential of utilizing TLD-100 personal dosimetry, conventionally applied in PET/CT (positron emission tomography/computed tomography) settings, in the PET/MRI (magnetic resonance imaging) environment. The integration of MRI into conventional radiotherapy and PET systems necessitates ionizing radiation dosimetry in the presence of static magnetic fields. In this study, TLD-100 dosimeters were exposed on the surface of a water-filled cylindrical phantom containing PET-radioisotope and positioned on the patient table of a 3 T PET/MRI, where the magnetic field strength is around 0.2 T, aiming to replicate real-world scenarios experienced by personnel in PET/MRI environments. Results indicate that the modified MR-safe TLD-100 personal dosimeters exhibit no significant impact from the static magnetic field of the 3 T PET/MRI, supporting their suitability for personal dosimetry in PET/MRI settings. This study addresses a notable gap in existing literature on the effect of MRI static magnetic field on TLDs.
热释光剂量计 (TLD) 是一种紧凑且易于使用的工具，适用于各种应用，包括个人辐射剂量测量和放射治疗。本研究探讨了在 PET/MRI（磁共振成像）环境中使用传统应用于 PET/CT（正电子发射断层扫描/计算机断层扫描）设置的 TLD-100 个人剂量计的潜力。将 MRI 集成到常规放射治疗和 PET 系统中，需要在存在静磁场的情况下进行电离辐射剂量测量。在这项研究中，TLD-100 剂量计被暴露在一个充满水的圆柱形体模的表面上，该体模包含 PET 放射性同位素，并放置在 3 T PET/MRI 的患者台上，那里的磁场强度约为 0.2 T，旨在复制人员在 PET/MRI 环境中实际经历的情况。结果表明，经过修改的符合磁共振安全标准的 TLD-100 个人剂量计不受 3 T PET/MRI 静磁场的显著影响，支持其在 PET/MRI 环境中进行个人剂量测量的适用性。本研究解决了现有关于 MRI 静磁场对 TLD 影响的文献中的一个显著空白。
