【摘要】 锥形束CT(CBCT)是一种新型的高分辨率三维X线成像系统,不仅可立体地显示牙槽骨的高度、宽度和厚度,还可精确地显示颌骨缺损的三维信息,从各个方向清楚地显示颌骨内病变的范围、边界,骨质破坏,受累牙情况及其与周围解剖结构的毗邻关系。在牙根纵裂的早期诊断中,CBCT显现牙根纵裂的敏感度、准确性远高于X线根尖片和曲面体层片,且轴位断层图像显示的根纵折裂纹明显较冠状位和矢状位要清晰;但CBCT产生的条纹状伪影和线束硬化现象会降低扫描图像质量;CBCT对软组织的分辨率较低,不能精确显现牙髓病和根尖周软组织病变。相信随着系统配置和软件的进一步开发,CBCT有望成为口腔疾病诊断最理想的影像设备。更多还原

【Abstract】 Cone beam computed tomography(CBCT) is a new type of high-resolution three-dimensional(3D) X-ray imaging system. CBCT can not only display the height, width, and thickness of the alveolar bone stereoscopically, but it also can display the 3D information of jaw defects. The range and boundary of jaw lesions, bone destruction, condition of involved teeth, and adjacent relationship between the teeth and surrounding anatomical structures from all directions can be accurately shown. In the early diagnosis of vertical root fracture, the sensitivity and accuracy of vertical root fracture revealed by CBCT is considerably higher than periapical radiography and orthopantomography. Images of longitudinal fracture crack obtained by axial tomography are clearer than those of coronal and sagittal tomography. However, the streak artifact and beam hardening produced by CBCT can reduce the quality of scanning images. The resolution of CBCT is lower for soft tissues, so the lesions of pulp and periapical soft tissues cannot be accurately shown. With further development of the system confi guration and software, CBCT is expected to become the most ideal image equipment for the diagnosis of oral diseases.更多还原