Abstract
Purpose
In craniomaxillofacial (CMF) surgery planning, a preoperative reconstruction of the CMF reference model is crucial for surgical restoration, especially the reconstruction of bilateral defects. Current reconstruction algorithms mainly generate reference models from the image analysis aspect, however, clinical indicators of the CMF reference model mostly consider the distribution of anatomical landmarks. Generating a reference model with optimal clinical evaluation helps promote the feasibility of an algorithm.
Methods
We first build a dataset with 100 normal skull models and then calculate a statistical shape model (SSM) and the distribution of normal cephalometric values, which indicate the statistical features of a population. To further generate personalized reference models, we apply non-rigid registration to align the SSM with the defect skull model. An evaluation standard to select the optimal reference model considers both global performance and anatomical evaluation. Moreover, we develop a landmark detection network to improve the automatic level of the algorithm.
Results
The proposed method performs better than methods including Iterative Closest Point and SSM. From a global evaluation aspect, the results show that the RMSE between the reference model and the ground truth is \(1.71 \pm 0.23\) mm, the percentage of vertices with error below 2 mm is \(85 \pm 4\)% and the average faces distance is \(1.38 \pm 0.20\) mm (better than the state-of-the-art method). From the anatomical evaluation aspect, the target registration error between the landmark pairs is \(4.12 \pm 2.27\) mm. In addition, the clinical application confirms that the reference model can meet clinical requirements.
Conclusion
To the best of our knowledge, we propose the first CMF reconstruction method considering the global performance of reconstruction and anatomically local evaluation from clinical experience. Simulated experiments and clinical cases prove the general applicability and strength of the method.










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Acknowledgments
The authors acknowledge support from National Natural Science Foundation of China (82027807, 81901844), and Beijing Municipal Natural Science Foundation (7212202, L192013).
Funding
National Natural Science Foundation of China, 82027807, Hongen Liao, 81901844, Longfei Ma, Natural Science Foundation of Beijing Municipality, 7212202, Hongen Liao, Beijing Municipal Natural Science Foundation, L192013, Longfei Ma.
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Han, B., Jie, B., Zhou, L. et al. Statistical and individual characteristics-based reconstruction for craniomaxillofacial surgery. Int J CARS 17, 1155–1165 (2022). https://doi.org/10.1007/s11548-022-02626-y
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DOI: https://doi.org/10.1007/s11548-022-02626-y