Abstract
Purpose
Laparoscopic liver resection is a minimal invasive surgery. Augmented reality can map preoperative anatomy information extracted from computed tomography to the intraoperative liver surface reconstructed from stereo 3D laparoscopy. However, liver surface registration is particularly challenging as the intraoperative surface is only partially visible and suffers from large liver deformations due to pneumoperitoneum. This study proposes a deep learning-based robust point cloud registration network.
Methods
This study proposed a low overlap liver surface registration algorithm combining local mixed features and global features of point clouds. A learned overlap mask is used to filter the non-overlapping region of the point cloud, and a network is used to predict the overlapping region threshold to regulate the training process.
Results
We validated the algorithm on the DePoLL (the Deformable Porcine Laparoscopic Liver) dataset. Compared with the baseline method and other state-of-the-art registration methods, our method achieves minimum target registration error (TRE) of 19.9 ± 2.7 mm.
Conclusion
The proposed point cloud registration method uses the learned overlapping mask to filter the non-overlapping areas in the point cloud, then the extracted overlapping area point cloud is registered according to the mixed features and global features, and this method is robust and efficient in low-overlap liver surface registration.
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Acknowledgements
This work was supported by grants from the NSFC Grant Program (Nos. 62172401 and 12026602); the Key-Area Research and Development Program of Guangdong Province (No. 2020B010165004); the National Key R&D Program, China (No. 2019YFC0118100); the Natural Science Foundation of Guangdong Province (Nos. 2022A1515010439 and 2022A1515010176); the Shenzhen Key Basic Science Program (Nos. JCYJ20180507182437217 and JCYJ20220531100614032); and the Shenzhen Key Laboratory Program (No. ZDSYS201707271637577).
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Guan, P., Luo, H., Guo, J. et al. Intraoperative laparoscopic liver surface registration with preoperative CT using mixing features and overlapping region masks. Int J CARS 18, 1521–1531 (2023). https://doi.org/10.1007/s11548-023-02846-w
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DOI: https://doi.org/10.1007/s11548-023-02846-w