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Multiscale Fusion and Boundary Refinement UNet Model for Lung Parenchyma Segmentation
Proceedings of 2024 International Conference on Machine Learning and Intelligent Computing, PMLR 245:57-66, 2024.
Abstract
Methods based on automatic computer-aided systems for lung cancer diagnosis have gained popu-larity in recent years. Lung parenchyma segmentation technology plays an important role in these methods. To reduce the gradient loss, improve the feature utilization, and alleviate the difficulty of fully mining the contextual information in lung parenchyma segmentation, this study proposes a network model for lung parenchyma segmentation based on a Multiscale fusion and Boundary Refinement UNet (MBR–UNet) model. First, along the encoding path, the features are efficiently extracted by a Residual–Residual block module. Next, along the decoding path, a multiscale at-tention–spatial pyramid pooling module fully integrates the feature maps of different layers and sums the outputs of each layer of the decoding path for boundary refinement. Finally, the training model is optimized through a hybrid loss function. The proposed model is experimentally evaluated on the lung segmentation dataset of the Kaggle competition. The accuracy, Dice similarity coefficient, intersection ratio, and Hausdorff distance of the network segmentation are improved by 98.79%, 97.35%, 96.34%, and 12.82 mm, respectively, from those of other segmentation methods. According to these results, the method can more precisely segment pulmonary parenchyma than the existing methods.