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[Abstract] Objective: To study the clinical value of 2DSCT and 3DSCT
in the Maxillofacial Fractures Methods：A tolal of 185 cases with Maxillofacial Fractures were examined using spiral CT.All cases received surface shaded display （SSD） and multiplannar reconstruction（MPR）method，the drawing and deleting way was used for these three dimensional images.The accuracy of diagnosis between2DSCT－3DSCT。Results：The 3DSCT can clearly present the three dimensional anatomy and their relationships of the maxillofacial fractures，more thiner the scanning layer,more clearly of images we got. Conclusion: The 3DSCT is important in evaluating maxillofacial fractures ,it could be used to demonstrate clearly locations and move conditions of maxillofacial fractures and operative plans.It is a new technique to display maxillofacial fractures.
[Key words] 3DSCT；2DSCT；X－ray；maxillofacial fractures
[摘要] 目的：探讨螺旋二维CT、三维CT对颌面骨折的临床应用价值。方法: 对185例颌面骨折患者螺旋CT扫描，应用表面遮盖技术(shaded surface display,SSD)、多层面重建（multiplanar reformation,MPR）、应用Syngo软件勾画删除技术对图像进行分割，比较二维、三维CT诊断准确率。结果：三维CT能清楚显示复杂颌面骨折的立体解剖图像与结构关系，并同时获得患者软组织实时图像，二维CT更好的提供细微骨折及深部骨折的信息，二者互补。扫描层厚越薄重建图像越清晰。结论：三维CT有利于确定颌面骨折的程度与骨折的移位真实情况，对颌面部骨折的术前诊断和手术计划制定具有较大临床意义，是显示颌骨骨折的影像新技术
[关键词] 螺旋三维CT；螺旋二维CT；全景片；颌面骨折
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