Dosimetric dependence of ocular structures on eye size and shape for external radiation fields of electrons, photons, and neutrons
Dosimetric dependence of ocular structures on eye size and shape for external radiation fields of electrons, photons, and neutrons
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DOI：
10.1088/1361-6498/ab2bcb
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发表时间：
2019-09-01
影响因子：
1.5
通讯作者：
Bolch，Wesley E.
中科院分区：
文献类型：
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作者：
Furuta，Takuya;El Basha，Daniel;Bolch，Wesley E.
在标准ICRP出版物116辐照几何形状内，研究了眼结构对眼睛大小和形状的剂量学依赖性。一个现实的运输几何构造插入一个可扩展的和可变形的风格化的眼睛模型在我们以前的研究中开发的ICRP出版物110成年男性参考计算体模的头部。在AP、RLAT、PA和ROT几何结构中，使用蒙特卡罗辐射输运程序PHITS模拟了外部电子、光子和中子对该体模的束辐照。计算了眼结构如睫状体、视网膜和视神经以及透镜中的吸收剂量。一个明确的剂量依赖于眼睛的大小和形状的眼睛结构观察外部电子，而只有一个小的依赖被视为外部光子和中子。这种趋势的差异归因于它们的深度剂量分布，其中扩散剂量分布由光子和中子产生，而更集中的分布由外部电子产生。
The dosimetric dependence of ocular structures on eye size and shape was investigated within the standard ICRP Publication 116 irradiation geometries. A realistic transport geometry was constructed by inserting a scalable and deformable stylised eye model developed in our previous study within the head of the ICRP Publication 110 adult male reference computational phantom. Beam irradiations of external electrons, photons, and neutrons on this phantom were simulated using the Monte Carlo radiation transport code PHITS in the geometries of AP, RLAT, PA and ROT. Absorbed doses in ocular structures such as ciliary body, retina, and optic nerves were computed as well as that in lens. A clear dosimetric dependence of ocular structures on eye size and shape was observed for external electrons while only a small dependence was seen for external photons and neutrons. Difference of the tendency was attributed to their depth-dose distributions where spread dose distributions were created by photons and neutrons while more concentrated distributions were created by external electrons.