人体MCNP重复结构辐射计算模型可视化方法

Visualization of the Human Radiation Computation Phantom Described by MCNP Repeated Structure

人体体素模型包含体素数目巨大,在应用MCNP(Monte Carlo N-Particle Transport Code)进行剂量计算中通常采用重复结构形式,但是却存在几何正确性校验困难等问题。本文研究一种快速和准确的人体辐射计算模型可视化方法。该方法通过MCNP输入文件中的栅元描述获取相同材料的体素信息,对其赋予三维坐标值并深度合并。在保持几何形状不变的前提下,成功构建器官模型,实现了对其进行三维显示与交互。测试结果验证了该方法对于人体重复结构计算模型几何校验的正确性与高效性。

The human voxel phantoms, which have a large number of voxels, often used repeated structure in MCNP （Monte Carlo N-Particle Transport Code） for its geometry description. However, it could bring difficulty in the human geometry verification. A faster and more accurate method is put forward in this paper for the visualization. The material voxels are got through the cell numbers in the input file. Then every voxel of certain material is assigned with a three-dimensional position so as to be deeply merged. Finally, the organ models are constructed without the shape changed which could be easily interacted in three-dimensional display. As a result, the experiment shows its correctness and high-performance for verifying the geometry of the human computational phantom described by repeated structure.