二维和三维CT对面中部骨折诊断的对比研究  

Comparison of 2D-CT and 3D-CT in diagnosing mid-facial fractures

作　　者：王平仲[1] 余强[1] 石慧敏[1] 罗济程[1] 

机构地区：[1]上海第二医科大学口腔医学院放射科,200011

出　　处：《中华口腔医学杂志》2001年第4期256-258,共3页Chinese Journal of Stomatology

摘　　要：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 。Objective The aim of this study is to measure the value of 2D-CT and 3D-CT in diagnosing mid-facial fractures Methods 50 patients who suffered from faci al trauma were scanned with both conventional axial-CT (3 mm thickness) and 3D reconstruction (surface shaded display, SSD) The scanning region was ranged fr o m the upper teeth to superior edge of the orbit Coronal-CT imaging was perfor me d in 21 patients in order to compare with that of axial and 3D CT images Results Axial 2D-CT can be better to identify facial fractures than 3D reconstruction in such sites that are medial wall of the maxilla (5/0 sides) , lateroposterior wall of the maxilla (49/44 sides), upper alveoli (14/12 si des), lateral wall of the orbit (34/31 sides), and pterygoid process of the sphenoid bone (19/9 sides ) Three-dimensional reconstruction was superior to 2D-CT in demonstrating fr act ure of anterior wall of the maxilla (60/57 sides) and shapes of the facial fract ure 2D-CT is similar to 3D-CT in diagnosing fractures of nasal bone (20 side s), zygomatic bone and arch (24 sides) Owing to the partial volume effect, the me d ial wall of normal or abnormal orbit could not be correctly evaluated on 3D refo rmation images Conclusion It is concluded that 2D-CT should be regarded as the foundations of diagnosing facial fractures, and 3D- reconstruction as a useful complementary tool

关 键 词：体层摄影术 X线计算机 面部骨折 CT 

分 类 号：R816.98[医药卫生—放射医学]