用螺旋CT资料建立颅面三维模型

目的：用螺旋CT数据资料建立颅面三维模型，并探讨了该模型在颅颌面外科领域的应用。方法：患者行螺旋CT扫描，层厚2mm，螺距1.0，利用工作站，进行扫描图像的容积三维重建后，重新间隔分层，利用CuteFTP4.0软件以BMP格式下载。应用课题组自主开发的CT图像处理软件对已下载的二维图像进行过滤、筛减、降噪、校正失真等处理，对图像的边缘轮廓进行提取，得到面颅骨皮质骨边缘轮廓的矢量化线图，将该线图数据输入Surfacer9．0重建软件，对轮廓曲线进行矢量增加，从而得到面颅骨的三维三角形面片（triangular facts）线框模型及实体模型。进一步在该模型上按镜像关系重构衬垫物的三维模型。结果：得到了颅面骨骼表面轮廓的三维实体模型，并在其上进行了整形手术的计算机辅助设计，通过快速成型技术（rapid prototyping,RP)加工出衬垫物模板。结论：用螺旋CT数据资料可以建立颅面三维模型，该模型在颅颌面畸形损伤肿瘤等的诊断和治疗中将发挥重要作用。

Establishment of 3-Dimensional Model of Skull Using SCT Datum

Objective:To establish 3-dimensional model of skull using SCT datum and discussing its application in craniofacial surgery.Methods:Skull of the patient was scanned with Picker 6000 SCT with 1.0 slice thickness and pitch of 1.5,and the datum obtained were treated in Voxel Q image workstation for 3D reconstruction with volume rendering technique.After having been downloaded to personal computer at 0.1mm interval, the transaxial 2D image data were converted into 2D digitized contour data by using image processing software developed by experimental team.The 3-D wire frame and solid images of skull could be reconstructed when the digitized data were inputted into image processing software of Surfacer 9.0.Results:The 3-D wire frame and solid image of skull was reconstructed and CAD for plastic operation was accomplished on it. Then the simulacrum of underlay was obtained by RP.Conclusions:3-dimensional model of skull could be established using SCT datum. It might play an important role in the diagnosis and treatment of tumors, injuries and abnormality in craniofacial surgery.