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Difference images corresponding to the top surfaces of Figure 4, b–d, with respect to the ground truth shown in Figure 4a. a, Trilinear interpolation algorithm. b, Voxel nearest neighbor algorithm. c, Distance-weighted algorithm. Representative curves in each image show the respective image difference (interpolated image subtracting the ground-truth image) as a function of the radial position from the origin along the dashed line (the scale of the image difference is also shown).
