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Performance of sparse-view CT reconstruction with multi-directional gradient operators

Fig 2

Relative positions of voxels in a 3D image.

m and n represent the voxel row and column of the image. i is the level in the z direction. The voxel fi,m,n has 26 neighboring voxels around it.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0209674.g002