Abstract
Purpose
The analysis of the maxillary sinus (MS) can provide an assessment for many clinical diagnoses, so accurate CT image segmentation of the MS is essential. However, common segmentation methods are mainly done by experienced doctors manually, and there are some challenges such as low efficiency and precision. As for automatic methods, the initial seed points and adjustment of various parameters are required, which will affect the segmentation efficiency. Thus, accurate, efficient, and automatic segmentation method of MS is critical to promote the clinical application.
Methods
This paper proposed an automatic CT image segmentation method of MS based on VGG network and improved V-Net. The VGG network was established to classify CT slices, which can avoid the failure of CT slice segmentation without MS. Then, we proposed the improved V-Net based on edge supervision for segmenting MS regions more effectively. The edge loss was integrated into the loss of the improved V-Net, which could reduce region misjudgment and improve the automatic segmentation performance.
Results
For the classification of CT slices with MS and without MS, the VGG network had a classification accuracy of 97.04 ± 2.03%. In the segmentation, our method obtained a better result, in which the segmentation Dice reached 94.40 ± 2.07%, the Iou (intersection over union) was 90.05 ± 3.26%, and the precision was 94.72 ± 2.64%. Compared with U-Net and V-Net, it reduced region misjudgment significantly and improved the segmentation accuracy. By analyzing the error map of 3D reconstruction, it was mainly distributed in ± 1 mm, which demonstrated that our result was quite close to the ground truth.
Conclusion
The segmentation of the MS can be realized efficiently, accurately, and automatically by our method. Meanwhile, it not only has a better segmentation result, but also improves the doctor’s work efficiency, which will have significant impact on clinical applications in the future.
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Acknowledgements
This work was supported by grants from National Key R&D Program of China (2017YFB1302900), National Natural Science Foundation of China (81971709; 81828003; M-0019; 82011530141), the Foundation of Ministry of Education of China Science and Technology Development Center (2018C01038), the Foundation of Science and Technology Commission of Shanghai Municipality (19510712200), and Shanghai Jiao Tong University Foundation on Medical and Technological Joint Science Research (ZH20182DA15;YG2019ZDA06;ZH2018QNA23).
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Xu, J., Wang, S., Zhou, Z. et al. Automatic CT image segmentation of maxillary sinus based on VGG network and improved V-Net. Int J CARS 15, 1457–1465 (2020). https://doi.org/10.1007/s11548-020-02228-6
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DOI: https://doi.org/10.1007/s11548-020-02228-6