上海交通大学学报（医学版）

›› 2012, Vol. 32 ›› Issue (7): 902-.doi: 10.3969/j.issn.1674-8115.2012.07.017

• 论著（基础研究） • 上一篇    下一篇

CT扫描结合立体光固化技术制造犬肋骨实体的实验研究

阮 征1,2, 王永武1, 毛建强2, 陈 勇3, 梁学炎3, 伍 斌4   

  1. 1.同济大学附属同济医院胸外科 |功能材料实验室, 上海 200065；2.上海交通大学附属第一人民医院心胸外科, 上海 200080； 3.上海瑞珑汽车技术有限公司, 上海 201600； 4.上海质子汽车有限公司, 上海 201600
  • 出版日期:2012-07-28 发布日期:2012-08-17
  • 通讯作者: 王永武, 电子信箱: wangyongwu993@126.com。
  • 作者简介:阮 征（1970—）, 男, 副主任医师, 博士生；电子信箱: ruanzheng002245@126.com。

Fabrication of canine rib prosthesis based on CT scan and stereo lithography apparatus technique

RUAN Zheng1,2, WANG Yong-wu1, MAO Jian-qiang2, CHEN Yong3, LIANG Xue-yan3, WU Bin4   

  1. 1.Department of Cardiothoracic Surgery, Medical Function Materials Laboratory, Tongji Hospital, Tongji University, Shanghai 200065, China；2. Department of Cardiothoracic Surgery, the First People´s Hospital, Shanghai Jiaotong University, Shanghai 200080, China；3.Shanghai FoDragon Automotive Technology Co. Ltd., Shanghai 200160, China；4.Shanghai ZhiZi Automotive Co. Ltd., Shanghai 200160, China
  • Online:2012-07-28 Published:2012-08-17

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摘要：

目的 应用计算机断层成像（CT）扫描和立体光固化(SLA)快速成型技术制造犬肋骨实体，并评估精确度。方法 将DICOM格式的犬肋骨数据导入OsiriX软件中，提取右侧第7肋骨图像数据进行三维重建并转化为STL格式文件，再经UG软件处理和修饰，建立计算机辅助设计（CAD）模型，形成IGS格式的文件输送至SLA快速成型机，以光敏树脂为材料制造肋骨实体。应用三维激光扫描系统对人工肋骨实体及其原型分别进行扫描，获取点云数据输入Geomagic Qualify软件进行分析，以肋骨原型为模板，设定偏差值为±0.5 mm，评价精确度。结果 应用CT扫描和SLA技术能够制造出具有完全几何外形的犬肋骨实体。肋骨实体经过三维激光扫描后，获得接近30 000个点云数据。肋骨实体与其原型比较，最大正偏差为1.764 mm，负偏差为－2.126 mm，平均偏差为0.183/－0.253 mm，标准差为0.346 mm，88.17%的点云数据在±0.5 mm的范围内。结论 CT扫描结合CAD和SLA技术制造具有完全几何外形的人工肋骨实体，具有精确度高及制造过程快速、便捷、直观和无创的特点；根据扫描提示的偏差部位，明确需要进一步优化和改进的区域。

关键词: 数字化扫描, 立体光固化, 快速成型, 光敏树脂, 几何外形, OsiriX软件, Geomagic Qualify软件, 肋骨, 犬

Abstract:

Objective To design and fabricate canine rib prosthesis with full geometric shape based on computed tomography (CT) scan and stereo lithography apparatus (SLA) rapid prototyping, and evaluate the precision. Methods DICOM format files of the canine right seventh rib were subject to three-dimensional reconstruction and were transformed to STL format files by OsiriX software, which were then modified by UG software for establishment of computer-aided design (CAD) model. Files with IGS format were formed and subject to rapid prototyping, and canine rib prosthesis was manufactured with photosensitive materials. The rib prosthesis and authentic rib were scanned by three-dimensional laser scanning system, and were analyzed by Geomagic Qualify software. With authentic rib as the template, the deviation of ±0.5 mm was set, and the precision was evaluated. Results The canine rib prosthesis with full geometric shape was obtained with CT scan and SLA technique. About 30 000 point cloud data were acquired after three-dimensional laser scan of rib prosthesis. The maximum positive deviation, maximum negative deviation, average deviation and standard deviation were 1.764 mm, －2.126 mm, 0.183/－0.253 mm and 0.346 mm respectively between the prosthesis and authentic rib. About 88.17% of point cloud data ranged from －0.5 mm to 0.5 mm. Conclusion It is feasible to design and fabricate rib prosthesis with full geometric shape based on CT scan combined with CAD and SLA technique, which is rapid, direct and accurate. Improvement can be made based on the deviation suggested by the scanning.

Key words: digital scan, stereo lithograph, rapid prototyping, photosensitive resin, geometric shape, OsiriX software, Geomagic Qualify software, rib, canine