Simulation on THz computed tomography image reconstruction methods

Terahertz(THz) radiation has many particular characteristics, which make THz image technology become the hot research area. As the distribution information of the cross section and the 3D reconstruction image of a sample can be obtained, THz computed tomography(CT) also attracts wide extensive attention worldwide. The simulation research was done based on continuous THz CT. The filtered back-projection(FBP) method and the modified simultaneous algebraic reconstruction technique(MSART) method have been utilized to reconstruct cross-section images, and the efficiency of the image processing operations such as the Gaussian low-pass filter(GLPF) and the morphological functions in mathematical morphology like open operation and close operation in improving reconstruction image quality has been compared and analyzed. It can be inferred from the simulation results that the required number of the projection directions using the MSART method and the corresponding image processing operations can only be 9, which is inosculate to the real imaging experiment results.