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Figure 4: The reconstruction results of cylinder phantoms. The top row is the results from noiseless projections and the bottom row is the results from noisy projections. From left to right: the first column is the fully sampled reconstructed by FBP, the second column is the fully sampled reconstructed by FBP, the third column is the reconstruction results of undersampled by PICCS, and the fourth column is the results from PPFC, the grey scale windows for the low-energy images and high-energy images are and .