Specific absorbed fractions for internal photon emitters calculated for a tomographic model of a pregnant woman.
Specific absorbed fractions for internal photon emitters calculated for a tomographic model of a pregnant woman.
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为孕妇的断层扫描模型计算的内部光子发射器的特定吸收分数。
DOI：
10.1097/01.hp.0000133364.55155.09
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发表时间：
2004
期刊：
影响因子：
2.2
通讯作者：
Stabin,MG
中科院分区：
文献类型：
--
作者：
Shi,CY;Xu,XG;Stabin,MG
特定的吸收分数是计算来自内部发射体的辐射剂量所必需的。使用程式化模型计算孕妇现有的特定吸收分数;在这项工作中，孕妇的部分身体断层扫描模型是从一组罕见的CT图像构建的。基于此层析模型，蒙特卡罗代码，EGS 4-VLSI，被用来获得特定的吸收分数。从15 keV到4 MeV的单能、各向同性光子发射体分布在不同的源器官中，并计算了体内许多靶区域的剂量。尽管结果与先前的研究结果在较高能量下基本一致，但也发现了显着差异，特别是在较低能量下。差异的主要原因是由于质量、几何形状和器官距离的变化，并且它们证明了更真实的身体模型对剂量计算的影响。
Specific absorbed fractions are essential for calculation of radiation dose from internal emitters. Existing specific absorbed fractions for pregnant women were calculated using the stylized models; in this work, a partial-body tomographic model for a pregnant woman was constructed from a rare set of CT images. Based on this tomographic model, the Monte Carlo code, EGS4-VLSI, was used to derive specific absorbed fractions. Monoenergetic, isotropic photon emitters from 15 keV to 4 MeV were distributed in different source organs, and doses were calculated to many target regions in the body. Even though the results showed general agreement with previous studies for higher energies, significant differences were also found, especially for lower energies. The main reasons for the differences are due to the variation of mass, geometry, and organ distances, and they demonstrate the influence of more realistic body models on dose calculations.