Intraoperative laparoscopic liver surface registration with preoperative CT using mixing features and overlapping region masks,International Journal of Computer Assisted Radiology and Surgery

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Intraoperative laparoscopic liver surface registration with preoperative CT using mixing features and overlapping region masks
International Journal of Computer Assisted Radiology and Surgery ( IF 2.3 ) Pub Date : 2023-02-14 , DOI: 10.1007/s11548-023-02846-w
Peidong Guan _{1,

2} , Huoling Luo ₁ , Jianxi Guo ₃ , Yanfang Zhang ₃ , Fucang Jia _{1,

2,

4}

Affiliation

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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