Abstract
Purpose
The robust and automatic segmentation of the pulmonary lobe is vital to surgical planning and regional image analysis of pulmonary related diseases in real-time Computer Aided Diagnosis systems. While a number of studies have examined this issue, the segmentation of unclear borders of the five lobes of the lung remains challenging because of incomplete fissures, the diversity of anatomical pulmonary information, and obstructive lesions caused by pulmonary diseases. This study proposes a model called Regularized Pulmonary Lobe Segmentation Network to accurately predict the lobes as well as the borders.
Methods
First, a 3D fully convolutional network is constructed to extract contextual features from computed tomography images. Second, multi-task learning is employed to learn the segmentations of the lobes and the borders between them to train the neural network to better predict the borders via shared representation. Third, a 3D depth-wise separable de-convolution block is proposed for deep supervision to efficiently train the network. We also propose a hybrid loss function by combining cross-entropy loss with focal loss using adaptive parameters to focus on the tissues and the borders of the lobes.
Results
Experiments are conducted on a dataset annotated by experienced clinical radiologists. A 4-fold cross-validation result demonstrates that the proposed approach can achieve a mean dice coefficient of 0.9421 and average symmetric surface distance of 1.3546 mm, which is comparable to state of the art methods. The proposed approach has the capability to accurately segment voxels that are near the lung wall and fissure.
Conclusion
In this paper, a 3D fully convolutional networks framework is proposed to segment pulmonary lobes in chest CT images accurately. Experimental results show the effectiveness of the proposed approach in segmenting the tissues as well as the borders of the lobes.
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Acknowledgements
This work was supported by the National Major Science and Technology Projects of China under Grant 2018AAA0100201, the Major Science and Technology Project from the Science & Technology Department of Sichuan Province under Grant 2020YFG0473 and by the Science and Technology Project of Chengdu, PR China under Grant 2017-CY02-00030-GX.
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Liu, J., Wang, C., Guo, J. et al. RPLS-Net: pulmonary lobe segmentation based on 3D fully convolutional networks and multi-task learning. Int J CARS 16, 895–904 (2021). https://doi.org/10.1007/s11548-021-02360-x
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DOI: https://doi.org/10.1007/s11548-021-02360-x