快速成型技术辅助颜面萎缩衬垫物设计  

Rapid prototyping helps presurgical plan for hemifacial atrophy

作　　者：龚振宇[1] 刘彦普[1] 周树夏[1] 刘亚雄[2] 李涤尘[2] 何黎升[1] 

机构地区：[1]第四军医大学口腔医学院颌面外科,陕西西安710033 [2]西安交通大学先进制造研究所,陕西西安710049

出　　处：《第四军医大学学报》2003年第13期1189-1191,共3页Journal of the Fourth Military Medical University

基　　金：国家自然科学基金 (599750 74) ;高等学校青年教师教学和科研奖励基金

摘　　要：目的 :探讨应用计算机辅助设计和快速成型技术(rapidprototyping ,RP)制造用于矫正半侧颜面萎缩等凹陷畸形的衬垫物的可能性 .方法 :患者行螺旋CT扫描 ,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CuteFTP 4 .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Surfacer 9.0重建软件 ,对轮廓曲线进行矢量叠加 ,从而得到面颅骨的三维三角形面片 (triangularfacets)线框模型及实体模型 .将健侧面颅骨的点云数据按镜像关系对称变换到患侧 ,这样在患侧骨和健侧镜像之间就形成了充填物的三维模型 ,为补偿软组织的萎缩 ,将其外表面点云数据外移 1.5mm .对CAD后的三维Surfacer数据重新分层 ,在RpDataRepare中完成充填物的轮廓编辑和成型的支撑设置 ,形成RP项目文件 ,输出快速原型所需的加工文件 .par,制造出衬垫物模板 ,作为实施手术过程中的参照 .结果 :获得了患者颅面骨表面轮廓的三维实体模型 ,并由计算机辅助设计 ,快速成型制造出衬垫物模板 ,并以此为参照完成手术 ,效果满意 .结论AIM: To discuss the feasibility of manufacturing underlay for the treatment of hemifacial atrophy using computer assisted design (CAD) and rapid prototyping. METHODS: Skull of the patient was scanned with Picker 6000 SCT and the data obtained were processed in Voxel Q image workstation for 3 D reconstruction with volume rendering technique. Downloaded to personal computer at 0.4 mm interval, the transaxial 2 D image data were converted into digitized 2 D 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. According to mirror image relation, facial bone of normal side was duplicated to the atrophied side. Thus a 3 D image of simulacrum came into being between the atrophied bone surface and the surface of mirror image of normal side. The model was designed 1.5 mm thicker to compensate the atrophy of soft tissue. After being converted into RP data format, the CAD design was imported into rapid prototyping machine, and the prototype of simulacrum for operation was obtained. RESULTS: The 3 D wire frame and solid images of skull were reconstructed and simulacrum of underlay was obtained with computer assistance. An operation, referring to the prototype of simulacrum, was performed and got a satisfactory result. CONCLUSION : The manufacture of underlay for the treatment of hemifacial atrophy can be accomplished by computer assisted design and rapid prototyping. It is a promising technique in the field of individualized underlay making in craniofacial surgery.

关 键 词：图像处理 体层摄影术 计算机辅助 半侧颜面萎缩 快速成型 颜面萎缩衬垫物 设计 

分 类 号：R782[医药卫生—口腔医学]