论文部分内容阅读
目的 评价二维CT和三维CT对面中部骨折诊断的价值。方法 对 5 0例面部创伤患者行横断二维CT扫描 (层厚 3mm) ,并进行三维重建 (表面阴影遮盖显示法 ,SSD)。扫描范围包括上颌牙列至眼眶上缘。 2 1例患者尚行冠状面CT扫描 ,以作对照。结果 和三维CT相比 ,横断二维CT较三维CT更好地显示上颌内壁 (5 / 0侧 ) ,上颌外后壁 (4 9/ 44侧 ) ,上颌牙槽 (14/ 12侧 ) ,眼眶外壁(34 / 31侧 )和蝶骨翼突区 (19/ 9侧 )的骨折。三维CT在显示上颌前壁骨折 (6 0 / 5 7侧 )和骨折形态方面优于二维CT。横断二维CT和三维CT对鼻骨 (2 0侧 )和颧骨颧弓骨折 (2 4侧 )的显示呈一致性。由于部分容积效应 ,SSD三维CT通常不能区别正常或异常的眼眶内壁。结论 二维CT是诊断面部骨折的基础 ,三维CT能对二维CT作有益补充
Objective To evaluate the diagnostic value of the two-dimensional CT and three-dimensional CT in the middle of the fracture. Methods Fifty cases of traumatic facial trauma were scanned by two-dimensional CT (thickness 3mm) and three-dimensional reconstruction (shaded surface display method, SSD). Scan range includes the maxillary dentition to the superior orbital rim. Twenty-one patients underwent coronal CT scan as a control. Results Compared with three-dimensional CT, the transverse two-dimensional CT showed better performance than the three-dimensional CT in maxillary wall (5/0 side), maxillary posterior wall (49/44), maxillary alveolus (14/12) External wall (34/31 side) and sphenoid wing (19/9 side) of the fracture. Three-dimensional CT is superior to two-dimensional CT in displaying maxillary anterior wall fractures (60/57 sides) and fracture morphology. Cross-sectional 2D and 3D CT showed consistent findings for nasal (20 sides) and zygomatic arch fractures (24 sides). Due to the partial volume effect, SSD three-dimensional CT usually can not distinguish normal or abnormal orbital wall. Conclusion Two-dimensional CT is the basis of diagnosis of facial fractures. Three-dimensional CT can be a useful supplement to two-dimensional CT