基于断面配准的骨折自动复位技术

      Automatic Bone Fracture Reduction Technique with Section Registration

      • 摘要: 骨折复位是骨折治疗程序中的关键步骤,对恢复骨骼的结构完整和功能起着决定性作用。现有的骨折复位技术主要依赖半自动交互方法或健康侧骨骼模板进行配准,然而这些方法在临床实践中存在诸多局限性。为提高治疗的效率和准确性,该文提出了骨折自动复位算法。该算法利用骨折块断面的相似度进行配准,在解放医师劳动力的同时,摆脱了对健康侧骨骼模板的依赖。首先,基于骨折块表面变化量和粗糙度热值图提取闭合边缘;其次,以提取的闭合边缘为约束进行区域增长,得到骨折块断面并对其进行相似性匹配;接着,在配准阶段,由于迭代最近点(iterative closest point, ICP)算法对距离高度敏感,为降低噪声的影响,该文提出将点云几何特征融合到目标函数中,并对骨折块断面逐一进行配准;最后,在180例模拟数据和16 例临床数据集上对该文所提算法进行了详尽的测试与比较分析,结果表明,该文所提算法在复位精度上有显著提升,在临床骨折病例中将复位误差控制在1.7 mm以内。

         

        Abstract: As a fundamental aspect of bone fracture treatment, fracture reduction plays a decisive role in restoring the structural integrity and function of bones. At present, fracture reduction techniques mostly rely on semi-automatic interaction methods or healthy-side bone templates for registration, which have many limitations in clinical practice. In order to enhance treatment efficiency and accuracy, an automatic fracture reduction algorithm is proposed. This algorithm utilizes the similarity of fracture cross-sections for registration, thereby reducing the workload of physicians and eliminating the need for a healthy-side bone template. Initially, the closed edge is identified and extracted by analyzing the differences in the fracture surface and the calorific value diagram of the roughness distribution. Next, the fracture section is determined by using the identified closed edge as a guideline for regional expansion and similarity matching. During the registration phase, the iterative closest point (ICP) algorithm is highly sensitive to distance. Therefore, the geometric features of point clouds are incorporated into the objective function of the registration algorithm to mitigate the influence of noise, and fracture section registration is implemented one by one. Finally, the algorithm is tested and compared on 180 simulated datasets and 16 publicly available datasets. The results show that the proposed algorithm significantly improves the registration accuracy, and the registration error of clinical bone fracture cases is controlled within 1.7 mm.

         

      /

      返回文章
      返回