Abstract
An unpredictable dynamic surgical environment makes it necessary to measure morphological information of target tissue real-time for laparoscopic image-guided navigation. The stereo vision method for intraoperative tissue 3D reconstruction has the most potential for clinical development benefiting from its high reconstruction accuracy and laparoscopy compatibility. However, existing stereo vision methods have difficulty in achieving high reconstruction accuracy in real time. Also, intraoperative tissue reconstruction results often contain complex background and instrument information that prevents clinical development for image-guided systems. Taking laparoscopic partial nephrectomy (LPN) as the research object, this paper realizes a real-time dense reconstruction and extraction of the kidney tissue surface. The central symmetrical Census based semi-global block stereo matching algorithm is proposed to generate a dense disparity map. A GPU-based pixel-by-pixel connectivity segmentation mechanism is designed to segment the renal tissue area. An in-vitro porcine heart, in-vivo porcine kidney and offline clinical LPN data were performed to evaluate the accuracy and effectiveness of our approach. The algorithm achieved a reconstruction accuracy of ± 2 mm with a real-time update rate of 21 fps for an HD image size of 960 × 540, and 91.0% target tissue segmentation accuracy even with surgical instrument occlusions. Experimental results have demonstrated that the proposed method could accurately reconstruct and extract renal surface in real-time in LPN. The measurement results can be used directly for image-guided systems. Our method provides a new way to measure geometric information of target tissue intraoperatively in laparoscopy surgery.
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Funding
This work was supported by Natural Science Foundation of China (Grant No. 62173014) and Natural Science Foundation of Beijing Municipality (Grant No. L192057).
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All authors contributed to the study conception and design. XZ: Performed the research, Designed the reconstruction method, Analyzed the results. XJ: Designed the segmentation method, Coding the parallel computing. JW: Reviewed the manuscript, Acquired image data and project funding. YF: Supervised the project, Reviewed the final manuscript, Worked on the manuscript with support. CT: Supervised the project, Reviewed the final manuscript, Worked on the manuscript with support.
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Zhang, X., Ji, X., Wang, J. et al. Renal surface reconstruction and segmentation for image-guided surgical navigation of laparoscopic partial nephrectomy. Biomed. Eng. Lett. 13, 165–174 (2023). https://doi.org/10.1007/s13534-023-00263-1
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DOI: https://doi.org/10.1007/s13534-023-00263-1