基于硬质骨配准的CBCT和MRI数据融合重建下颌骨矢状劈开术可视化模型

发布时间：2018-02-25 19:12

本文关键词： CBCT MRI 图像配准下颌骨矢状劈开三维模型　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：目的基于硬质骨配准的CBCT和MRI数据融合重建下颌骨矢状劈开术可视化模型。方法选取一名符合下颌骨矢状劈开术适应征的Ⅱ类错颌畸形志愿者,扫描器颞下颌关节MRI及头颅CBCT数据,分别将其导入Mimics软件当中,获得牙列、下颌骨、关节窝、关节盘等组织结构模型,在Abaqus软件中构建手术钛板、钛钉模型,在Geomagic Studio软件中,进行模型的优化处理,并进行MRI和CBCT影响的精确配准,构建关节软骨、牙周膜等结构。获得三维模型后,在模型表面模拟下领骨矢状劈开术截骨线并模拟下颌前移,进行布尔运算,获得下颌骨矢状劈开术的可视化模型。结果1.对配准的MRI影像和CBCT影像行3D偏差检验:右侧平均偏差0.17mm±0.31mm,左侧平均偏差0.32mm±0.35mm,两者3D偏差小、配准精确度高。2.建立了包含颞下颌关节在内的下颌骨矢状劈开术的三维可视化模型,模型各解剖结构清晰,手术模拟效果良好。结论1.基于硬质骨在MRI和CBCT中的影像特征配准,可有效地对MRI和CBCT三维影像进行空间配准,其配准后关节盘生理结构复位良好,可真实模拟关节盘在关节窝中的位置。2.通过逆向软件构建包含颞下颌关节在内的下颌骨矢状劈开术的三维可视化模型,可真实模拟手术截骨线、下颌前移以及内固定位置等操作,具有较大的临床使用意义。
[Abstract]:Objective to reconstruct a visual model of sagittal split mandible based on CBCT and MRI data fusion of rigid bone registration. The data of temporomandibular joint (MRI) and cranial CBCT were imported into Mimics software, respectively. The tissue structure models of dentition, mandible, articular fossa and articular disc were obtained. The models of titanium plate and nail were constructed in Abaqus software, and the model of titanium nail was constructed in Geomagic Studio software. The model was optimized, and the effects of MRI and CBCT were accurately matched to construct the articular cartilage and periodontal ligament. After the 3D model was obtained, the osteotomy line of sagittal split of the collar was simulated on the surface of the model and the mandibular anterior displacement was simulated. The visual model of sagittal split mandible was obtained by Boolean operation. Results 1. The 3D deviation of registered MRI and CBCT images was 0.17mm 卤0.31mm on the right side and 0.32mm 卤0.35mm on the left side. 2. The 3D visualization model of sagittal split mandible including temporomandibular joint was established. The anatomical structure of the model was clear and the result of operation simulation was good. Conclusion 1. Based on the image feature registration of rigid bone in MRI and CBCT, The spatial registration of MRI and CBCT images can be carried out effectively, and the physiological structure of the articular disc can be reset well after registration. The 3D visualization model of sagittal split mandible including temporomandibular joint is constructed by reverse software, and the osteotomy line can be simulated. Mandibular anterior movement and internal fixation are of great clinical significance.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R782

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