平板X射线源重叠投影的线性迭代重建

Linear Iterative Reconstruction for the Overlapped Projection of Flat-Panel X-Ray Source

为解决平板X射线源多个射线源同时照射时产生的投影重叠问题带来的图像重建困难,本研究提出了一种基于平板X射线源重叠投影的CT图像重建方法。该方法引入线性修正因子修正投影重叠带来的非线性,然后使用联合代数重建算法(SART)实现CT图像的重建。实验表明,该方法可以实现平板X射线源重叠投影直接重建CT图像,但是随着平板X射线源阵列数增大,重建图像质量下降。

A CT image reconstruction method based on overlapping projection of flat-panel X-ray source was proposed in order to solve the problem of image reconstruction caused by multiple X-ray sources.The nonlinearity caused by projection aliasing is corrected by introducing a linear correction term,then the CT image is obtained by using the simultaneous algebraic reconstruction technique.The experimental results illustrate that the proposed algorithm can reconstruct CT image by overlapping projection directly,but the quality of reconstructed images decreases with the increase of the number of flat-panel X-ray source arrays.