Organ dose conversion coefficients for 0.1-10 MeV electrons calculated for the VIP-MAN tomographic model
Organ dose conversion coefficients for 0.1-10 MeV electrons calculated for the VIP-MAN tomographic model
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DOI：
10.1097/00004032-200108000-00012
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发表时间：
2001-08-01
期刊：
影响因子：
2.2
通讯作者：
Xu, XG
中科院分区：
文献类型：
--
作者：
Chao, TC;Bozkurt, A;Xu, XG
伦斯勒理工学院最近根据国家医学图书馆可视人体项目的高分辨率彩色摄影图像开发了一种全身断层扫描模型，称为VIP人。EGS4-VLSI是一个基于EGS4的Monte Carlo用户程序，它可以有效地利用VIP-Man的大图像数据集来计算中子和光子的剂量。本文提出了一组新的100 keV~10 MeV单能电子束辐照VIP人时的注量-床剂量转换系数，辐照条件包括前后、后前、右、左、旋转和各向同性源几何。而现有的数学模型数据显示出显著的差异。看来，即使身体模型之间的微小差异，可能会导致显着的剂量偏差低穿透电子辐照。这表明，单一的标准人体模型可能不能很好地代表大量人群，并且可能无法接受电子剂量测定。
A whole-body tomographic model, called VIP-Man, was recently developed at Rensselaer Polytechnic Institute from the high-resolution color photographic images of the National Library of Medicine's Visible Human Project. An EGS4-based Monte Carlo user code, named EGS4-VLSI, was developed to efficiently transport electrons using the large image data set for VIP-Man. VIP-Man has been used to calculate doses for neutrons and photons. This paper presents a new set of fluence-to-absorbed-dose conversion coefficients for monoenergetic electron beams between 100 keV and 10 MeV for VIP-Man. Irradiation conditions include anterior-posterior, posterior-anterior, right lateral, left lateral, rotational, and isotropic source geometries, Comparisons between organ doses from VIP-Man, which is taller and heavier than the Reference Man, and existing data from mathematical models show significant discrepancies. It appears that even slight differences between body models can cause dramatic dosimetric deviations for low penetrating electron irradiation. This suggests that a single standard body model may poorly represent a large population and may not be acceptable for electron dosimetry.