利用蒙特卡罗建模及估算儿童X-CT检查受照剂量

在儿科X射线-CT检查迅速增加的当下,尤其对电离辐射敏感的儿童,其所致医疗照射剂量的评估是十分重要和迫切的课题。本文结合已建立的1岁儿童体素体模,利用蒙特卡罗技术建立扫描模型,进行CT检查所致儿童受检者的医疗照射剂量估算。建立了CT单层轴向扫描时对1岁儿童36个器官或组织所产生医疗照射剂量的数据库,利用该数据库,可快速估算1岁儿童受检者接受CT扫描时的医疗照射剂量。并与同样扫描条件下的实验测量值进行了比较,结果显示二者相对偏差在25%以内。

Modeling and dose estimation of pediatric X-CT examination using Monte Carlo technique

With the rapid development and wide application of X-ray CT examination, estimation of the dose from CT exposures has become a hot research spot, especially for children since they tend to have higher radiation sensitivity than adults. In this work, a CT scanner model was developed using the Monte Carlo technique and was applied to estimate organ doses derived from simulated CT exposures with a 1-year-old voxel phantom developed by our group. As a result, a database including doses to 36 organs and tissues was built for 1-year-old children. This medical exposuredose database provides a method for the estimation of 1-year-old patient doses in a variety of CT examinations. And it has been verified by measurement this method is convenient and reliable.