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Unsupervised image transfer enables intra- and inter-modality transfer for medical applications where a large amount of paired training data is not abundant. To ensure a structure-preserving mapping from the input to the target domain, existing methods for unpaired medical image transfer are commonly based on cycle-consistency, causing additional computation resources and instability due to the learning of an inverse mapping. This paper presents a novel method for uni-directional domain mapping where no paired data is needed throughout the entire training process. A reasonable transfer is ensured by employing the GAN architecture and a novel generator loss based on patch invariance. To be more precise, generator outputs are evaluated and compared on different scales, which brings increased attention to high-frequency details as well as implicit data augmentation. This novel term also gives the opportunity to predict aleatoric uncertainty by modeling an input-dependent scale map for the patch residuals. The proposed method is comprehensively evaluated on three renowned medical databases. Superior accuracy on these datasets compared to four different state-of-the-art methods for unpaired image transfer suggests the great potential of this approach for uncertainty-aware medical image translation. Implementation of the proposed framework is released here: https://github.com/anger-man/unsupervised-image-transfer-and-uq.
