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Phantom data set 2. (Tumour 1): (a) Original PET image (128 × 128), (b) thresholded image (128 × 128), (C) clustered image (128 × 128), (d) segmented image (64 × 64) using ANN and MRA, zoomed by a factor of 2, where tumour 1 (2 voxel) is detected.
