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Reconstructed slices of NPG (absorption contrast) without any alignment or filtering (left). Slices after filters have been applied (middle): non-local means filter (53 min, 15 min), median 3D and non-local means (3 min), low-pass filter and non-local means (36 s), and low-pass filter and median 3D (6 s). Automated threshold segmentation of slices (right).
