基于tomosynthesis的图像重建方法

Image Reconstruction Based on Tomosynthesis

首先对tomosynthesis方法及其原理进行了分析 ,通过对tomosynthesis中各断层像和投影像间的关系方程组的变形 ,证明tomosynthesis与直接重建法 (ART)在本质上是相同的。tomosynthesis的重建过程的实质就是反投影重建法 ,是在有限角的情况下的不完全数据重建。在全方位投影信息情况下 ,我们可以把全方位投影信息视为两个有限角投影信息的组合。最后利用tomosynthesis中按行重建的概念 ,以行为单位进行重建。计算机仿真结果证明结论正确。

As a reconstruction method earlier than CT,tomosynthesis has its characteristic.This paper first analyzes principles of tomosynthesis,through transformation of equation set of tomosynthesis,which describes relation between sectional image and projection image,and we have proved that tomosynthesis is the same as Algebraic Reconstruction Techniques essentially.Reconstruction of tomosynthesis is indeed the reconstruction of Algebraic Reconstruction Techniques which under limited angle.We may regard all directive projection information as constitution of two limited angle projection information.Finally we reconstruct sectional image by using conception of “row”in tomosynthesis.And computer simulation has proved our conclusion to be correct.