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Title:: Research progress on the construction method of the CT radiation system model in Monte Carlo simulation

作者:: 刘颖1; 孟婷1; 路鹤晴2; 章浩伟1△; 1.上海理工大学健康科学与工程学院, 上海 200093;2. 同济大学附属第一妇婴保健院设备科，上海 200092）

Author(s):: LIU Ying1; MENG Ting1; LU Heqing2; ZHANG Haowei1; （1. School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Department of Medical Equipment, ShanghaiFirst Maternity and Infant Hospital Affiliated to Tongji Universit, Shanghai 200092）

Keywords:: CT radiation dose; Monte Carlo algorithm; Radiation source model; Photon energy distribution; Bowtie filter model; Scan motion simulation; Accuracy discussion

摘要:: X射线被用于医疗照射产生的辐射剂量在人体所受的整体剂量中占比最大，其中CT检查是人体剂量的主要来源。利用蒙特卡洛程序可以模拟计算CT检查时人体所受的辐射剂量，为确保模拟结果准确性，需要建立准确的CT辐射系统模型。本文按照获取X射线能谱、设计蝶形过滤器形状、构建准直器模型和模拟球管旋转运动的建模顺序，分别对国内外相关研究中提出的建模方法进行分类、对比和讨论，并总结出合理的CT辐射系统建模方法，为相关领域的研究者提供参考。

Abstract:: The radiation dose generated by X-rays used for medical exposure accounts is the largest proportion of the overall public dose, and CT examination is the main source of population dose. The Monte Carlo program can be used to simulate and calculate the radiation dose received by the human body during CT examination. In order to ensure the accuracy of the simulation results, it is necessary to establish an accurate CT radiation system model.In this paper，according to the order of X-ray energy spectrum acquisition, bowtie filter shape design, collimator modeling and tube scanning motion simulation, the modeling methods proposed in domestic and foreign related research are classified, compared and discussed, and reasonable CT radiation system modeling methods are summarized to provide reference for researchers in related fields.