With the success of Transformers, hybrid Transformer and CNN methods gain considerable popularity in medical image segmentation. These methods utilize a hybrid architecture that combines Transformers and CNNs to fuse global and local information, supplemented by a pyramid structure to facilitate multi-scale interaction. However, they encounter two primary limitations: (i) Transformer struggle to capture complete global information due to the sliding window nature of the convolutional operator, and (ii) the pyramid structure within single decoder fails to provide sufficient multi-scale interaction necessary for restoring detailed features at higher levels. In this paper, we introduce the Hierarchical Decoder with Parallel Transformer and CNN (HiPar), a novel architecture designed to address these limitations. Firstly, we present a parallel structure of Transformer and CNN to maximize the capture of both global and local features. Subsequently, we propose a hierarchical decoder to model multi-scale information and progressively restore spatial details. Additionally, we incorporate lightweight components to enhance the efficiency of feature representation. Extensive experiments demonstrate that our HiPar achieves state-of-the-art results on three popular medical image segmentation benchmarks: Synapse, ACDC and GlaS.

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Hierarchical Decoder with Parallel Transformer and CNN for Medical Image Segmentation

  • Shijie Li,
  • Yu Gong,
  • Qingyuan Xiang,
  • Zheng Li

摘要

With the success of Transformers, hybrid Transformer and CNN methods gain considerable popularity in medical image segmentation. These methods utilize a hybrid architecture that combines Transformers and CNNs to fuse global and local information, supplemented by a pyramid structure to facilitate multi-scale interaction. However, they encounter two primary limitations: (i) Transformer struggle to capture complete global information due to the sliding window nature of the convolutional operator, and (ii) the pyramid structure within single decoder fails to provide sufficient multi-scale interaction necessary for restoring detailed features at higher levels. In this paper, we introduce the Hierarchical Decoder with Parallel Transformer and CNN (HiPar), a novel architecture designed to address these limitations. Firstly, we present a parallel structure of Transformer and CNN to maximize the capture of both global and local features. Subsequently, we propose a hierarchical decoder to model multi-scale information and progressively restore spatial details. Additionally, we incorporate lightweight components to enhance the efficiency of feature representation. Extensive experiments demonstrate that our HiPar achieves state-of-the-art results on three popular medical image segmentation benchmarks: Synapse, ACDC and GlaS.