上颈椎运动节段数字模型建立及三维可视化探究.docVIP

上颈椎运动节段数字模型建立及三维可视化探究 　【摘要】 目的：寻求连续CT断层图像重建上颈椎运动节段数字模型及三维可视化的方法。方法：基于上颈椎连续薄层CT图像，运用Mimics1001软件重建上颈椎运动节段骨性和各种软组织结构，并导入有限元分析Ansys10中初步进行有限元分析验证。结果：成功建立上颈椎运动节段三维数字模型并实现可视化。模型包括：C0～3骨性结构并区分皮质骨与松质骨、C1～3关节软骨盘、C2， 3椎间盘和6种韧带结构。上颈椎有限元模型初步验证结果与体外生物力学实验和临床结果相符，可进一步行各种上颈椎有限元分析。结论：Mimics软件基于薄层CT图像建立上颈椎有限元模型提供了一个更为快捷精确的方法，所建模型逼真，几何相似性好，为研究上颈椎的生物力学性状创造了条件。 【关键词】 CT图像 上颈椎 运动节段 数字化模型 可视化 Mimics软件 ［Abstract］Objective: To establish a digital model for reconstruction and three_dimensional visualization of upper cervical spinal motion segment from CT images. Methods: Based on continuous lamellar spiral CT images of upper cervical spine segments, the bony structures and various soft tissues were reconstructed with Mimics 1001 software, the model was imported into Ansys100 software for initial analysis and validation. Results: The three_dimensional digital model of the upper cervical spinal motion segment was successfully reconstructed. The model included C0～3 bony structures and distinguished the cortical and cancellous bone, cartilaginous opereulums from C1～3, disc of C2， 3 and 6 types of ligaments. The initial finite analysis results of the mode1 were matched to the results of the biomechanical studies and clinical findings. This model could be used for further finite element analysis of the biomechanical studies of the upper cervical spine. Conclusion: Mimics software provides a more quick and accurate method to establish three_dimensional digital model of the upper cervical spinal motion segment with good fidelity and geometric similarity, and facilitated further research the behaviors of the upper cervical spine. ［Key Words］computer tomography；upper cervical spine；motion segment；digital model segment；visulization；Mimics software 上颈椎为枕颈结合区，亦称枕_寰_枢(C0～2)复合体，由于其毗邻小脑、延髓、颈髓等重要结构，故损伤时常可致命。对该部位损伤机制和生物力学性状研究也逐渐引起了学者们的重视。三维有限元法是目前国内、外脊柱生物力学研究采用较多的先进应力数值分析方法，能够定量和定性地描述骨骼遭受各种外力作用下的应力分布。以往的研究模型主要是针对寰枢椎单个骨性结构的建模或简化韧带骨骼模型，与临床实际存在一定差距。本研究将基于上颈椎薄层CT图像建立上颈椎运动节段数字模型，为实现上颈椎的三维可视化和损伤机制的生物力学研究所用