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The structure of the MCNNs used in this study. The MMCNNs contained three residual CNNs with each input patches of 21×21×21 voxels (42 mm × 42 mm × 42 mm), 31×31×31 voxels (62 mm × 62 mm × 62 mm), and 41×41×41 (82 mm × 82 mm × 82 mm) voxels, respectively. Each residual CNN had 152 layers. MCCNs, multi-level residual CNNs; CNN, convolutional neural network.
