基于中国参考人的典型CT扫描患者剂量模拟与分析

目的 基于中国参考人体模，对典型CT患者剂量进行模拟与分析。开发一款在线评估CT扫描所致受检者器官吸收剂量和有效剂量的软件，为快速评估CT扫描辐射剂量提供工具。方法 采用蒙特卡罗方法，对GE LightSpeed 16型号CT进行建模，基于中国参考人体模计算中国成年男性、女性和1岁儿童受CT扫描照射后各组织器官的剂量，建立单层轴扫器官剂量数据库。开发基于web的CT剂量评估软件，根据用户输入的CT扫描参数，从器官剂量数据库中读取数据并快速计算器官吸收剂量和有效剂量。结果 开发了一款新的CT扫描剂量评估软件，可用于评估中国成年男女和1岁儿童在不同型号CT检查中，不同管电压、管电流、准直器宽度等CT参数下的器官剂量。CT扫描剂量评估软件的计算结果与两个文献数据进行对比，对于完全包含在扫描范围内的器官剂量差异较小，相对差异分别在15%和25%以内。结论 CT扫描剂量评估软件为简单快速评估CT扫描辐射剂量提供了有力的工具。

Simulation and analysis of CT examination doses to typical patients based on Chinese reference human phantoms

Objective To simulate and analyze the CT examination doses to typical patients based on Chinese reference human phantom, and to develop an online software for assessing the organ absorbed dose and effective dose to the examinees undergoing CT examination in order to provide a tool for rapid assessment of radiation dose from CT examination.Methods Based on the Monte Carlo simulation, a GE LightSpeed 16 CT scanner was modeled. The organ doses to Chinese adult male, female and 1 year-old child male from single axial scan were calculated based on the Chinese reference phantoms and an organ dose database was established. A web-based CT dose assessment software was developed to read the data from the organ dose database according to the CT scanning parameters entered by the user and to calculate the organ absorbed dose and effective dose rapidly.Results A new CT dose assessment software was developed, which can be used to assess organ doses to Chinese adult male, female and 1-year-old male for different CT scanner, voltage, current, collimator width and other CT parameters. The organ doses calculated in this work were compared with simulation data in two relevant studies. Dose differences for the organs completely included in the scan range were small, with relative differences less than 15% and 25%, respectively.Conclusions The CT dose assessment software provides a powerful tool for the simple and rapid assessment of radiation dose to the examinees undergoing CT examinations.