Abstract
Purpose
US-guided percutaneous focal liver tumor ablations have been considered promising curative treatment techniques. To address cases with invisible or poorly visible tumors, registration of 3D US with CT or MRI is a critical step. By taking advantage of deep learning techniques to efficiently detect representative features in both modalities, we aim to develop a 3D US-CT/MRI registration approach for liver tumor ablations.
Methods
Facilitated by our nnUNet-based 3D US vessel segmentation approach, we propose a coarse-to-fine 3D US-CT/MRI image registration pipeline based on the liver vessel surface and centerlines. Then, phantom, healthy volunteer and patient studies are performed to demonstrate the effectiveness of our proposed registration approach.
Results
Our nnUNet-based vessel segmentation model achieved a Dice score of 0.69. In healthy volunteer study, 11 out of 12 3D US-MRI image pairs were successfully registered with an overall centerline distance of 4.03±2.68 mm. Two patient cases achieved target registration errors (TRE) of 4.16 mm and 5.22 mm.
Conclusion
We proposed a coarse-to-fine 3D US-CT/MRI registration pipeline based on nnUNet vessel segmentation models. Experiments based on healthy volunteers and patient trials demonstrated the effectiveness of our registration workflow. Our code and example data are publicly available in this repository.
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Code availability
Our code is publicly available (https://github.com/Xingorno/3DUS_CT-MRI_Rigid_registration).
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Acknowledgements
This work was supported in part by the Canadian Institutes of Health Research Grants 154314 and 143232, the Ontario Institute for Cancer Research Grant RA#262, the Natural Sciences and Engineering Research Council of Canada Grant 1248179, the Canadian Foundation for Innovation Grant 20994, and the Ontario Research Fund-Research Excellence Round 10. The authors also acknowledge the generous hardware contribution by NVIDIA Inc.
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The Western University Health Science Research Ethics Board has approved our patient data collection trial. The patient trial was carried out in accordance with the Ethical Conduct for Research Involving Humans (TCPS 2).
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Xing, S., Romero, J.C., Roy, P. et al. 3D US-CT/MRI registration for percutaneous focal liver tumor ablations. Int J CARS 18, 1159–1166 (2023). https://doi.org/10.1007/s11548-023-02915-0
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DOI: https://doi.org/10.1007/s11548-023-02915-0