体素大小对小鼠体素模型中比吸收分数和S值的影响。
Influence of voxel size on specific absorbed fractions and S-values in a mouse voxel phantom.
作者信息
Mohammadi A, Kinase S
机构信息
Japan Atomic Energy Agency, 2-4 Shirakata, Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
出版信息
Radiat Prot Dosimetry. 2011 Feb;143(2-4):258-63. doi: 10.1093/rpd/ncq391. Epub 2010 Nov 30.
Photon and electron specific absorbed fractions (SAFs) and S-values have been evaluated using mouse voxel phantoms. In voxel phantoms, it is important to choose the voxel size carefully since it affects the accuracy of results. In this study, two mouse voxel phantoms were constructed, with cubic voxels, one with 0.1-mm sides and the other with 0.4-mm sides. The sources were considered to be distributed uniformly in the main organs and the radiation transport was simulated using the Monte Carlo code EGS4. It was found that the effect of voxel size on SAFs for self-irradiation was not high (<10 %) for electrons and photons. However, it was appreciable for cross-irradiation especially for electrons. The effect of voxel size was investigated on S-values for some beta emitters such as (131)I, (153)Sm, (188)Re and (90)Y.
已使用小鼠体素模型评估了光子和电子的特定吸收分数（SAF）及S值。在体素模型中，仔细选择体素大小很重要，因为它会影响结果的准确性。在本研究中，构建了两个具有立方体体素的小鼠体素模型，一个体素边长为0.1毫米，另一个体素边长为0.4毫米。源被认为均匀分布在主要器官中，并使用蒙特卡罗代码EGS4模拟辐射传输。结果发现，对于电子和光子，体素大小对自辐照的SAF的影响不高（<10%）。然而，对于交叉辐照，尤其是电子，这种影响是明显的。研究了体素大小对一些β发射体（如¹³¹I、¹⁵³Sm、¹⁸⁸Re和⁹⁰Y）的S值的影响。
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