基于可视化的计算机断层扫描辐射系统模型构建与软件设计  

Model construction and software design of computed tomography radiation system based onvisualization

作　　者：刘颖[1] 孟婷 章浩伟[1] 路鹤晴 LIU Ying;MENG Ting;ZHANG Haowei;LU Heqing(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,P.R.China;Department of Medical Equipment,Shanghai First Maternity and Infant Hospital,School of Medicine,Tongji University,Shanghai 200092,P.R.China)

机构地区：[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

出　　处：《生物医学工程学杂志》2023年第5期989-995,共7页Journal of Biomedical Engineering

基　　金：国家自然科学基金项目(82073474)。

摘　　要：蒙特卡洛模拟程序(MCNP)常被用于计算机断层扫描(CT)所致受检者辐射剂量的计算。然而该模型的物理计算过程较为繁杂且程序的输入文件结构复杂,不支持几何模型的三维显示,从而导致研究者无法建立准确的CT辐射系统模型,影响剂量计算结果的准确性。针对这两大问题,本研究设计了一个可视化CT建模并自动生成输入文件的软件。在模型计算方面,融合各大研究者的CT建模改进方案来作为理论基础;在三维模型可视化方面,以LabVIEW为新的开发平台、实体几何构造法(CSG)为算法原理,引入MCNP输入文件的编辑方式来实现CT几何建模的可视化。相比一个近期研究所建立的CT模型,本可视化CT建模软件所模拟的结果与实际测量的均方根误差更小。该CT可视化建模软件不仅可以帮助研究者获得准确的CT辐射系统模型,而且为MCNP的几何建模可视化方法提供了新的研究思路。The Monte Carlo N-Particle(MCNP)is often used to calculate the radiation dose during computed tomography(CT)scans.However,the physical calculation process of the model is complicated,the input file structure of the program is complex,and the three-dimensional(3D)display of the geometric model is not supported,so that the researchers cannot establish an accurate CT radiation system model,which affects the accuracy of the dose calculation results.Aiming at these two problems,this study designed a software that visualized CT modeling and automatically generated input files.In terms of model calculation,the theoretical basis was based on the integration of CT modeling improvement schemes of major researchers.For 3D model visualization,LabVIEW was used as the new development platform,constructive solid geometry(CSG)was used as the algorithm principle,and the introduction of editing of MCNP input files was used to visualize CT geometry modeling.Compared with a CT model established by a recent study,the root mean square error between the results simulated by this visual CT modeling software and the actual measurement was smaller.In conclusion,the proposed CT visualization modeling software can not only help researchers to obtain an accurate CT radiation system model,but also provide a new research idea for the geometric modeling visualization methodof MCNP.

关 键 词：辐射剂量 计算机断层扫描辐射系统模型 蒙特卡洛模拟程序 可视化建模 实体几何构造法 

分 类 号：R318[医药卫生—生物医学工程] TP391.41[医药卫生—基础医学] TL72[自动化与计算机技术—计算机应用技术]