基于相位恢复的失配反射层析图像重建算法

Misaligned Reflective Tomography Image Reconstruction Algorithm Based on Phase Retrieval

研究了基于计算机断层扫描的激光反射层析成像技术的相关理论。实际情况下由于目标运动与探测平台振动等原因,非合作目标不同角度的反射投影相对于目标旋转中心存在平移,从而引起不同角度下投影失配,导致投影重建图像出现失真和伪影。采用误差减小、混合输入-输出相位恢复法对投影失配条件下反射层析重建图像进行相位恢复,仿真验证了该算法在投影角度过采样、完全投影与稀疏投影角度下的可行性。

We study the theory of laser reflective tomography technology based on computed tomography.In practice,due to the movement of the target and the vibration of detection platform,there are the shifts between the reflection projections of non-cooperated target at different angles and the target rotation center,which is projectionmisalignment and causes the distortion and constructed defects of reconstructed image from projections.We use the error-reduction and hybrid in-out algorithm to recover the phases of reflective tomography reconstructed images with misaligns.The simulation verifies the feasibility of the algorithm under the angles of oversampling,full projection,and sparse projection of projection angles.