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Illustration of our proposed image synthesis method using 3D-RevGAN for learning the mappings between MRI and PET. Encoders Enc (red) and Enc (purple) lift/encode from the image space into the feature spaces. Decoders Dec (black) and Dec (green) project/decode back to the image space. Compared with CycleGAN using two generators, RevGAN only uses one generator to complete the bidirectional mapping from MRI to PET and PET to MRI.
