Fig. 1. Overall structure of the improved model

Fig. 2. RR block. (a) Overall structure, the residual block is nested with the recombination block, and the recombination block is nested within the SegSE block; (b) structure of the recombination block; (c) structure of the recalibration block; (d) structure of the residual block

Fig. 3. Module structure. (a) SE module; (b) recalibration module

Fig. 4. Attention mechanism structure

Fig. 5. Flow chart of pretreatment

Fig. 6. Broken line diagram of the influence of RR block on the model. (a) Dice Score; (b) Sensitivity

Fig. 7. Segmentation results. (a) CT original image; (b) gold standard; (c) prediction result; (d) comparison between gold standard and prediction result

Fig. 8. Three-dimensional diagram of segmentation results, the left side of each image is the prediction result, and the right side is the comparison between the segmentation result and the real annotation. (a) MPUNet; (b) nnU-Net; (c) Spider UNet; (d) proposed method