锥形束 X 线直接体积成像的理论研究

Study on Direct Volume Imaging Based on Cone Beam X Ray Projections

对由锥形束Ｘ线投影重建体积数据的直接体积成像方法进行了理论研究．提出了基于Ｒａｄｏｎ变换的体积成像几何结构的完全性条件．构造了基于中间函数的体积重建算法．在不同的成像结构下得到了直接体积重建的计算机数值仿真结果．理论研究表明。

The direct volume imaging(DVI) means the reconstruction of volume data from a series of cone beam X ray 2D projections. A precisely described complete condition is obtained which is independent from various algorithms. A unified framework using several intermedium functions is constructed and a novel algorithm belonging to this framework is developed. The reconstruction algorithm under single circle geometry, helix and two vertical circle is implemented by numeric simulation. The results show that DVI is of interests and values.