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Mean dice similarity coefficient (DSC)s on training and validation sets during the network training with CELoss (a,b,c) and DICELoss (d,e,f). 3D‐UNet computed tomography (CT)/positron emission tomography (PET) means 3D‐UNet trained on CT or PET only data. Deep learning fully convolutional networks (DFCN)‐CoSeg means the feature fusion DFCN‐CoSeg network architecture for PET‐CT cosegmentation. [Color figure can be viewed at wileyonlinelibrary.com]
