北京大学学报（医学版）2016，Vol.48Issue(2)：330-335,6.DOI:10.3969/j.issn.1671-167X.2016.02.028
3种生成大视野锥形束CT数据正中矢状面方法的比较
Evaluation of three methods for constructing craniofacial mid-sagittal plane based on the cone beam computed tomography
摘要
Abstract
Objective:To compare the accuracyof interactive closet point (ICP)algorithm,Procrustes analysis (PA)algorithm,andalandmark-independent method to construct the mid-sagittal plane (MSP)of the cone beam computed tomography.To provide theoretical basis for establishing coordinate systemof CBCT images and symmetric analysis.Methods:Ten patients were selected and scanned by CBCT before orthodontic treatment.The scan data was imported into Mimics 10.0 to reconstructthree dimensional skulls.And the MSP of each skull was generated by ICP algorithm,PA algorithm and landmark-independ-ent method.MSP extracted by ICP algorithm or PA algorithm involvedthree steps.First,the 3D skull processing was performed by reverse engineering software geomagic studio 2012 to obtain the mirror skull. Then,the original and its mirror skull was registered separately by ICP algorithm in geomagic studio 2012 and PA algorithm in NX Imageware 1 1 .0.Finally,the registered data were united into new data to calcu-late the MSP of the originaldata in geomagic studio 2012.The mid-sagittal plane was determined by SEL-LA (S),nasion (N),basion (Ba)as traditional landmark-dependent methodconducted in software InVivoDental 5.0.The distance from 9 pairs of symmetric anatomical marked points to three sagittal plane were measured and calculated to compare the differences of the absolute value.The one-way ANOVA test was used to analyze the variable differences among the 3 MSPs.The pairwise comparison was performed with LSD method.Results:MSPs calculated by the three methods were available for clinic analysis,which could be concluded from the front view.However,there was significant differences among the distances from the 9 pairs of symmetric anatomical marked points to the MSPs (F=10.932,P=0.001).LSD test showed there was no significant difference between the ICP algorithm and landmark-independent method (P=0.1 1 ),while there was significant difference between the PA algorithm and landmark-independent methods (P =0.01 ).Conclusion:Mid-sagittal plane of 3D skulls could be generated base on ICP algorithm or PA algorithm.There was no significant difference between the ICP algorithm and landmark-independent method.For the subjects with no evident asymmetry,ICP algorithm is feasible in clinical analysis.关键词
正中矢状面/锥束计算机体层摄影术/算法Key words
Mid-sagittal plane/Cone-beam computed tomography/Algorithms分类
医药卫生引用本文复制引用
王斯维,黎敏,杨慧芳,赵一姣,王勇,刘怡..3种生成大视野锥形束CT数据正中矢状面方法的比较[J].北京大学学报（医学版）,2016,48(2):330-335,6.基金项目
国家高技术研究发展计划（863计划，2013AA040803）项目资助Supported by the National High Technology Research and Develop-ment Program of China （）
