Figure 2.

The overall network framework of the UARAI network. The overall architecture is constructed based on the 3D U-Net. Firstly, at the encoding stage, the multi-scale feature aggregation module (MSFA) is applied to integrate features from different scales. In addition, a reverse attention module is incorporated after the jump connection to calculate the reverse attention coefficients. The coefficients are then used to re-weight the foreground and thus enhance the feature expression ability.