使用NaI(Tl) 测量仪直接测量甲状腺的不确定性:个体之间的解剖差异的影响
Masato Narita1, Kotaro Tani2, Naoaki Kunishima3
1Naka Fusion Institute, National Institutes for Quantum Science and Technology, Ibaraki, Japan.
Radiation protection dosimetry
|October 11, 2023
概括
个性化的voxel幻影显示了放射性测量的显著变化. 标准校准幻影可能会高估甲状腺131I含量,强调需要个性化剂量评估.
科学领域:
- 医学物理 医学物理
- 核医学就是核医学.
- 辐射保护 辐射保护
背景情况:
- 用于甲状腺放射性测量的光子探测器依赖于幻影校准.
- 幻影校准引入了不确定性,原因是幻影和个体之间的解剖学和形态学差异.
研究的目的:
- 通过使用个性化的voxel幻影来研究NaI(Tl) 测量仪的转换因子的变化.
- 评估参考日本voxel幻影的适用性,以校准甲状腺放射性测量.
- 确定影响转换因子的因素及其对剂量评估的影响.
主要方法:
- 从成年志愿者 (15名男性,9名女性) 的MRI扫描中创建了24个个人voxel幻影.
- 数字模拟计算转换因子 (131I kBq 在甲状腺每μSv h-1) 对于一个NaI(Tl) 测量仪.
- 从个人幽灵获得的转换因子与参考日本幽灵的转换因子进行比较.
主要成果:
- 转换因子在个人之间差异很大.
- 参考日本的男性和女性幽灵高估了平均转换因子的1.29倍和1.18倍,分别.
- 甲状腺体积被确定为影响转化因子的关键因素,观察到相当大的个体差异.
结论:
- 参考幻影可能导致甲状腺放射性含量过高估计.
- 个性化的voxel幻象对于准确的剂量评估至关重要,特别是对于高度暴露的个体.
- 甲状腺体积的显著变化强调了在直接甲状腺测量中需要个性化的校准标准.
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