代数重建技术中投影序列选择次序的研究

在代数重建技术中投影序列的选择次序对重建收敛速度及精度均具有重要影响。针对在360°方向上均匀获取投影数据的场合,提出加权距离正交投影排序方法。该方法将投影序列分成若干组,在每一组内前后选择的投影序列彼此正交,同时相邻组之间投影序列尽可能均匀分布。该方法能提高重建精度及收敛速度,同时利用前后正交投影角度下射线经过像素信息关系,可将重建速度提高1倍。

Research of projection access order in algebraic reconstruction technique

Projection access order has crucial effect on reconstruction quality and speed of convergence in algebraic reconstruction technique. For instance to got projections in 360°orientations uniformly,the weighted distance orthogonality method was presented. The method groups the projection sequence with several groups. The consecutive projections in each group were orthogonal to each other and the projections between groups were evenly distributed. The method improved reconstruction quality and the speed of convergence,and at the same time increased the reconstruction speed for 1 times using relation of traversing pixels between consecutive orthogonal projections.