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Mathematical phantom segmentation results using the proposed convolutional neural network (CNN) or 2-means clustering segmentation processes. The type of voxel is already known in the ground truth image (generated mathematical phantom). Different types of voxels are extracted after segmentation via each method and compared to the ground truth. The V1 (a), V3 (b), and V5 (c) mathematical phantom results are shown in top, middle, and bottom rows, respectively.
