Cellular S-value evaluation based on real human cell models using the GATE MC package

成像体模 核素 椭球体 蒙特卡罗方法 球体 多边形(计算机图形学) 核医学 几何造型 物理 计算机科学 计算物理学 数学 几何学 化学 光学 核物理学 统计 医学 电信 生物化学 帧(网络) 天文 体外
作者
W. Tang,Bo Tang,Xiang Li,Yidi Wang,Zhanpeng Li,Yunan Gao,Han Gao,Congchong Yan,L. Sun
出处
期刊:Applied Radiation and Isotopes [Elsevier BV]
卷期号:168: 109509-109509 被引量:10
标识
DOI:10.1016/j.apradiso.2020.109509
摘要

Exploring the spatial distribution of the energy loss of ionising radiation at the subcellular level is indispensable for evaluating the radiobiological effects of targeted radionuclide therapy accurately. Believing that S-values are important for obtaining the target dose, the Committee on Medical Internal Radiation Dose (MIRD) proposed a method to obtain the cellular dosimetric parameter. However, most available data on cellular S-values were calculated based on simple geometric models, such as ellipsoids or spheres, which do not accurately reflect biological reality. To investigate the influence of the cellular model on S-values, calculations were performed for two kinds of polygon-surface phantom models of realistic, individual human cells, the lung epithelial cell model (the B2B Phantom model) and the hepatocyte model (the Liver Phantom model), using the Monte Carlo (MC) software package GATE. To analyse the influence of cell geometry on the final S-value, the differences in the S-values between the realistic cell models and simple geometric sphere and ellipsoid models with similar volumes were calculated and compared for six different combinations of source and target regions. The irradiation conditions were 0.01–1.10 MeV monoenergetic electron sources and the Auger electronic therapy nuclides Ga-67, Tc-99m, In-111, I-125 and Tl-201, which are commonly used in nuclear medicine. The S-values calculated in this study are different from the results of the simple geometry models proposed by previous researchers. Two more precise polygon-surface phantom models of realistic, individual human cells were used, which provided more accurate information about the cell dose and will be very useful for the diagnostic application of radiotherapy in the future.
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