摘要
目的应用激光三维扫描和Geomagic Qualify软件分析,测定和提高基于CT扫描和激光快速成型法制造肋骨实体的精确度。方法应用64排螺旋CT扫描获取DICOM格式的犬肋骨图像,经OsiriX软件对犬肋骨图像进行三维重建,提取犬右第8肋骨数据转化为STL格式文件,再经UG软件处理,建立肋骨实体模型,形成IGS格式的文件输送至激光快速成型机,应用光敏树脂材料制造出犬肋骨实体Ⅰ。应用三维激光扫描系统对犬肋骨实体Ⅰ和真肋原型进行扫描,并经Geomagic Qualify软件进行分析,以真肋为模板,设定偏差是±0.5 mm,自动生成报告,判断二者的差异处。再根据扫描所提示的产生较大偏差部位,优化设计,制造肋骨实体Ⅱ。结果应用医用CT扫描和激光快速成型法能够制造出具有完整几何外形的犬肋骨实体。经过激光三维扫描后,获得接近3万的点云数据。Geomag-ic Qualify分析肋骨实体Ⅰ与真肋原型之间,最大的正偏差1.764 mm,负偏差-2.126 mm,平均0.183/-0.253 mm,标准偏差0.346 mm,88.17%的点云数据在设定的范围内波动。根据3D色谱图的提示,确定产生较大偏差的部位,进行优化设计,再次制造肋骨实体Ⅱ。其最大的正偏差0.782 mm负偏差-0.964 mm,平均0.123/-0.255 mm,标准偏差0.247 mm,92.178%的点云数据在设定的范围内波动。结论应用激光三维扫描系统结合Geomagic Qualify软件,能够测定基于医用CT扫描和激光快速成型法制造肋骨实体的几何外形的精确度,具有快速、直观、便捷、无创的特点。根据扫描提示对偏差部位进行优化设计,能够较明显提高肋骨实体的精确度。
Objectives To design and fabricate rib prosthesis with full geometric shape based on digital imaging technique and rapid prototyping and measure the accuracy of rib prosthesis. Methods The CT images with DICOM format of right 8thrib of canine were transformed to images with STL format by OsiriX software and further modified and transformed to files with IGS format by UG software.The canine rib prosthesis were manufactured with photosensitive materials. The rib prosthesis and dogs' authentic rib were scanned by three dimensional laser scanning system and analyzed by Geomagic Qualify software. With the authentic rib as the template,we set the deviation within ±0.5mm. The report was automatically generated judging the difference. Results The canine rib prostheses with full geometric shape were obtained. About 30 thousands point cloud data was acquired.The average deviation was +0.243/-0.166 mm and the standard deviation was +0.324 mm between the prosthesis and authentic ribs. About 70.31% of point cloud data range from-0.167 to +0.167,69% of standard deviation of point cloud data range from-1 to +1,93% of standard deviation of point cloud data range from-2 to +2. Conclusions It is feasible to design and fabricate rib prosthesis with full geometric shape based on CT scan combined with rapid prototyping,which is rapid,direct and accurate. The prosthesis matches almost completely the shape of the authentic rib. Improvement should be made based on the deviation suggested by the scanning.
出处
《外科研究与新技术》
2014年第2期108-114,共7页
Surgical Research and New Technique
