螺旋CT多组织三维重建在寰枕和寰枢关节病变中的应用

目的　探讨多组织三维重建方法在寰枕和寰枢关节病变中的诊断作用。方法　 10例正常志愿者 ,42例寰枕或者寰枢关节畸形或外伤者 ,经螺旋CT扫描 ,对枕骨、寰椎和枢椎用同样阈值和灰阶行表面遮盖三维重建 (SSD) ;另对枕骨、寰椎和枢椎单独不同灰阶三维重建 ,再行三维多组织重建 (3DMT)。然后比较两者图像。结果　SSD和 3DMT均清楚显示出寰枕和寰枢之间的解剖结构关系 ,3DMT还能显示单个结构的内外表结构 ,避免相邻结构的重叠和遮挡。 3DMT清楚显示了寰枕融合畸形 ,关节的旋转脱位和椎体的骨折。结论　三维重建在寰枕和寰枢关节病变的诊断中有着重要的意义 ,多组织三维重建技术较常规的三维重建更具有优越性

Three-dimensional Multi-tissues CT Reconstruction of Atlantooccipital and Atlantoaxial Diseases

Objective To evaluate the role of three-dimensional multi-tissues (3DMT) CT reconstruction in imaging atlantoaxial and atlantooccipital deformities or traumas.Methods 10 normal volunteers and 42 patients with atlantoaxial and atlanoccipital deformities or traumas underwent spiral CT scan, then three-dimensional (surface shaded display, SSD) CT reconstruction and three-dimensional multi-tissues (3DMT) CT reconstruction.Results SSD and 3DMT reconstruction clearly demonstrated the anatomy of the bony structures and the spatial relationships between the occipitale and atlas, atlas and axis. 3DMT reconstruction respectively demonstrated the occipitale, atlas and axis. 3DMT more neatly demonstrated the deformities, fractures and dislocations of atlantoaxial and atlantooccipital joint than SSD reconstruction. Conclusion 3DMT CT illustrates the anatomical relationship of atlantooccipital and atlantoaxial complex and provides important information of the pathology. 3DMT is prior to SSD reconstruction.