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首页> 外文期刊>Journal of Digital Imaging >Patient-Specific Three-Dimensional Composite Bone Models for Teaching and Operation Planning
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Patient-Specific Three-Dimensional Composite Bone Models for Teaching and Operation Planning

机译：用于教学和手术计划的患者特定的三维复合骨模型

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Background: Orthopedic trauma care relies on two-dimensional radiograms both before and during the operation. Understanding the three-dimensional nature of complex fractures on plain radiograms is challenging. Modern fluoroscopes can acquire three-dimensional volume datasets even during an operation, but the device limitations constrain the acquired volume to a cube of only 12-cm edge. However, viewing the surrounding intact structures is important to comprehend the fracture in its context. We suggest merging a fluoroscope’s volume scan into a generic bone model to form a composite full-length 3D bone model. Methods: Materials consisted of one cadaver bone and 20 three-dimensional surface models of human femora. Radiograms and computed tomography scans were taken before and after applying a controlled fracture to the bone. A 3D scan of the fracture was acquired using a mobile fluoroscope (Siemens Siremobil). The fracture was fitted into the generic bone models by rigid registration using a modified least-squares algorithm. Registration precision was determined and a clinical appraisal of the composite models obtained. Results: Twenty composite bone models were generated. Average registration precision was 2.0 mm (range 1.6 to 2.6). Average processing time on a laptop computer was 35 s (range 20 to 55). Comparing synthesized radiograms with the actual radiograms of the fractured bone yielded clinically satisfactory results. Conclusion: A three-dimensional full-length representation of a fractured bone can reliably be synthesized from a short scan of the patient’s fracture and a generic bone model. This patient-specific model can subsequently be used for teaching, surgical operation planning, and intraoperative visualization purposes.
机译：背景：骨科创伤护理在手术前和手术中均依赖于二维放射线摄片。了解普通放射线图上复杂骨折的三维性质具有挑战性。现代荧光镜即使在手术过程中也可以获取三维体积数据集，但是设备的局限性将所获取的体积限制为只有12厘米边缘的立方体。但是，查看周围完整的结构对于理解骨折的背景很重要。我们建议将荧光镜的体积扫描合并到通用骨骼模型中，以形成合成的全长3D骨骼模型。方法：材料由一根尸骨和20个人体股骨的三维表面模型组成。在对骨骼施加受控骨折之前和之后进行放射线照相和计算机断层扫描。使用移动荧光镜（Siemens Siremobil）获取骨折的3D扫描。使用改良的最小二乘算法通过刚性配准将骨折适合通用骨模型。确定配准精度并获得复合模型的临床评估。结果：生成了20个复合骨模型。平均套准精度为2.0毫米（范围为1.6至2.6）。便携式计算机上的平均处理时间为35秒（范围为20到55）。将合成的放射线图与骨折的实际放射线图进行比较，可获得临床上令人满意的结果。结论：可以通过对患者骨折的短扫描和通用骨骼模型可靠地合成骨折骨的三维全长表示。该特定于患者的模型随后可用于教学，手术操作计划和术中可视化目的。

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