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目的研究和制备完整精确的眶模型,为临床眶畸形缺损的整形进行个性化整复的手术设计。方法螺旋CT扫描干性头颅,采集层厚1mm的CT数据;用分割微调阈值和“砌墙法”预处理CT数据;用MedGraphics软件建立三维可视模型;然后用快速原型机制作出三维实体眶模型。对干性头颅、三维可视模型和快速原型(RP)模型上的解剖点间距和眶内壁间的夹角进行对比测量,评估模型的精确度。结果建立了解剖结构完整而精确的眶模型。头颅与三维可视模型之间的平均差值为(0.10±1.02)mm,头颅与RP模型之间的平均差值为(0.22±1.04)mm。头颅、三维可视模型与RP模型三者的两两组间差异无统计学意义。头颅与RP模型上的眶内各壁夹角的差异无统计学意义。结论在外科医师与工程技术人员的密切配合下,选择层厚1mm的CT数据和“砌墙法”等图像预处理,采用多种软件及快速原型机能制备出满足临床需要的完整而精确的眶模型,在外形和功能上,可以提高临床眶畸形的整复效果。
Objective To study and prepare a complete and accurate orbital model for the surgical repair of orbital deformity defects personalized plastic surgery design. Methods CT images of 1mm thick layer were collected by spiral CT scanning. CT data were preprocessed by segmentation threshold and “wall masonry method”. Three-dimensional visual model was established by MedGraphics software. Then a three-dimensional solid orbital model . The contrast between the distance between anatomical points and the angle between the orbital walls of dry skulls, three-dimensional visual models and rapid prototyping (RP) models was evaluated to evaluate the accuracy of the model. Results A complete and accurate orbital model of anatomy was established. The average difference between head and three-dimensional visual models was (0.10 ± 1.02) mm, and the mean difference between head and RP models was (0.22 ± 1.04) mm. There was no significant difference between any two groups in head, 3D visual model and RP model. There was no significant difference in the angle between the orbital wall on the head and the RP model. Conclusions With the close cooperation of surgeons and engineers, CT data of 1mm in thickness and “wall-building method” were selected for image preprocessing. A variety of software and rapid prototyping machines were used to prepare complete and accurate orbit Model, in shape and function, can improve the clinical complex effect of orbital deformity.