Figure 11.

Reconstructed images of real projection data obtained by the synchrotron radiation CT at the SPring-8 facility in Japan. The top row shows reconstructions of pulmonary alveoli of a mouse lung, and the bottom row shows reconstructions of a phantom consisting of calcite in talc powder. In the both cases, we identified air regions using the iterative method proposed by Rashed and Kudo (38), which were used as the prior knowledge region B. It is observed that the low-frequency shading artifacts at the boundaries of the ROI significantly reduce by using the prior knowledge