Semi-supervised learning is a sound measure to relieve the strict demand of abundant annotated datasets, especially for challenging multi-organ segmentation . However, most existing SSL methods predict pixels in a single image independently, ignoring the relations among images and categories. In this paper, we propose a two-stage Dual Contrastive Learning Network for semi-supervised MoS, which utilizes global and local contrastive learning to strengthen the relations among images and classes. Concretely, in Stage 1, we develop a similarity-guided global contrastive learning to explore the implicit continuity and similarity among images and learn global context. Then, in Stage 2, we present an organ-aware local contrastive learning to further attract the class representations. To ease the computation burden, we introduce a mask center computation algorithm to compress the category representations for local contrastive learning. Experiments conducted on the public 2017 ACDC dataset and an in-house RC-OARs dataset has demonstrated the superior performance of our method.

我们提出了一个双对比学习网络，在半监督多器官分割中利用全局和局部对比学习加强图像和类别之间的关系。在第一阶段，我们开发了一个基于相似度引导的全局对比学习来探索图像之间的隐含连续性和相似性，并学习全局上下文。然后，在第二阶段，我们提出了一个器官感知的局部对比学习来进一步吸引类别表示。为了减轻计算负担，我们引入了一个掩码中心计算算法，用于压缩局部对比学习的类别表示。我们在公共的2017年ACDC数据集和内部的RC-OARs数据集上进行的实验证明了我们方法的优越性能。

Dcl-Net: 双对比学习网络用于半监督多器官分割