Hybrid algebraic reconstruction technique for tomographic reconstruction of the wave interaction around a rectangular rod

Laser Interferometric Computed Tomography (LICT) measurement enabled observation of the three-dimensional (3-D) density distribution of the unsteady flow field quantitatively. The interferometric fringe images are used as the projection data, and the flow field is reconstructed by appropriate reconstruction technique in LICT measurement. The flow field which do not include any object is reconstructed clearly. On the other hand, if the obstacle is included in the flow field, laser beam cannot pass through the obstacle and the projection data have imperfect parts. These imperfect parts cause strong artifacts in the CT images and we cannot identify any unsteady phenomena. To reduce these artifacts, we applied Hybrid Algebraic Reconstruction Technique (HART). In this study, the HART technique will be applied to the problem of reconstruction of wave interaction around a rectangular rod, and CT images obtained using HART and Algebraic Reconstruction Technique (ART) will be compared.