Abstract
Accurate segmentation of the right ventricle (RV) from cardiac magnetic resonance imaging (MRI) images is an essential step in estimating clinical indices such as stroke volume and ejection fraction. Recently, image segmentation methods based on fully convolutional neural networks (FCN) have drawn much attention and shown promising results. In this paper, a new fully automatic RV segmentation method combining the FC-DenseNet and the level set method (FCDL) is proposed. The FC-DenseNet is efficiently trained end-to-end, using RV images and ground truth masks to make a per-pixel semantic inference. As a result, probability images are produced, followed by the level set method responsible for smoothing and converging contours to improve accuracy. It is noted that the iteration times of the level set method is only 4 times, which is due to the semantic segmentation of the FC-DenseNet for RV. Finally, multi-object detection algorithm is applied to locate the RV. Experimental results (including 45 cases, 15 cases for training, 30 cases for testing) show that the FCDL method outperforms the U-net + level set (UL) and the level set methods that use the same dataset and the cardiac functional parameters are computed robustly by the FCDL method. The results validate the FCDL method as an efficient and satisfactory approach to RV segmentation.
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Acknowledgments
Many thanks to Prof. Stephen E. Greenwald (from School of Medicine and Dentistry, Queen Mary, University of London, UK) for reviewing the manuscript, improving the English, and providing helpful suggestions. We gratefully acknowledge the kind assistance of Prof. Benqiang Yang and Dr. Junrui Xiao in data collection and delineating the entire image dataset.
Funding
The research reported here was, in part, supported by the National Natural Science Foundation of China (No. 61773110, No. 61374015), the Natural Science Foundation of Liaoning Province (No. 20170540312), and the Fundamental Research Funds for the Central Universities (Nos. N181906001 and N181604006). This research is also supported by the Shenyang Science and Technology Plan Fund (No. 20-201-4-10), the Member Program of Neusoft Research of Intelligent Healthcare Technology, Co. Ltd. (No. MCMP062002).
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Luo, Y., Xu, L. & Qi, L. A cascaded FC-DenseNet and level set method (FCDL) for fully automatic segmentation of the right ventricle in cardiac MRI. Med Biol Eng Comput 59, 561–574 (2021). https://doi.org/10.1007/s11517-020-02305-7
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DOI: https://doi.org/10.1007/s11517-020-02305-7