基于GeDi与ICP及伪口腔扫描数据真值的颌骨CT与口腔扫描数据的由粗到精配准
Coarse-to-Fine Registration of Jawbone CT and Intraoral Scan Data Using GeDi and ICP with Pseudo-IOS Ground Truth
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中文总结 AI 辅助
本研究提出伪IOS评估框架，结合GeDi与ICP实现颌骨CT与口腔扫描数据的由粗到精配准，实验表明该方法精度优于单独使用GeDi，且受金属伪影影响较小。
中文摘要 AI 辅助
在数字牙科与口腔外科领域，颌骨CT与口腔扫描仪（IOS）数据的配准是整合内部骨结构与高分辨率牙面几何的关键步骤。然而该配准任务极具挑战性，因两种模态仅共享有限的公共区域，且其真实对应关系通常未知，这种不确定性阻碍了配准精度的严格定量评估。本研究提出一种伪IOS评估框架：在同一坐标系下从CT数据生成模拟口腔扫描的点云，使两者间的变换可通过构造得到，作为真实真值。基于该框架，我们提出一种由粗到精的配准方法，结合可泛化域的局部描述符GeDi（用于与初始位置无关的全局对齐）与迭代最近点（ICP）算法（用于局部细化），同时评估金属伪影对配准的影响。在7例实验中，仅使用ICP时，从受扰动初始位置出发常收敛至局部极小值；而GeDi+ICP在所有评估的颌骨及伪影条件下均保持亚毫米级平均绝对误差（MAE），范围为0.55-0.69mm。三因素重复测量分析证实，GeDi+ICP的精度显著优于单独使用GeDi；金属伪影存在可统计检测的整体影响，但其对GeDi+ICP的绝对影响较小。
英文摘要
In digital dentistry and oral surgery, the registration of jawbone CT and intraoral scanner (IOS) data is essential for integrating internal bone structure with high-resolution dental surface geometry. However, this registration is challenging because the two modalities share only a limited region in common, and their true correspondence is generally unknown. This uncertainty has prevented rigorous quantitative evaluation of registration accuracy. In this study, we propose a pseudoIOS evaluation framework in which a point cloud emulating an intraoral scan is generated from CT data within the same coordinate frame, so that the transformation between them is known by construction and can serve as a true ground truth. Using this framework, we propose a coarse-to-fine registration method that combines a domain-generalizable local descriptor (GeDi) for initialization-independent global alignment with the iterative closest point (ICP) algorithm for local refinement, and also evaluate the influence of metal artifacts on registration. In experiments on seven cases, ICP alone frequently converged to local minima from a perturbed initial position, whereas GeDi$+$ICP maintained submillimeter mean absolute error (MAE) across all evaluated jaw and artifact conditions (0.55-0.69 mm). A three-way repeated-measures analysis confirmed that GeDi$+$ICP was significantly more accurate than GeDi alone. Metal artifacts had a statistically detectable overall effect, but their absolute impact on GeDi$+$ICP was small.
发表机构
- Graduate School of Medicine, Kyoto University（京都大学医学研究生院）
- Rakuwakai Otowa Hospital（洛和会音羽医院）
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