两种方式构建的正中矢状面在面部畸形患者中的准确性研究  

A comparison of the accuracy of the original-mirror alignment algorithm and a landmark-independent method in constructing craniofacial midsagittal plane in patients with facial deformities

作　　者：廖奕翔 金刘莉 杜冰冉 胡飞 潘耀鹏 林媛 黎植文 张雪洋 LIAO Yixiang;JIN Liuli;DU Bingran;HU Fei;PAN Yaopeng;LIN Yuan;LI Zhiwen;ZHANG Xueyang(Center of Stomatology,Shunde Hospital of Southern Medical University,Foshan 528308,China;Stomatological Hospital,School of Stomatology,Southern Medical University,Guangzhou 510280,China)

机构地区：[1]南方医科大学顺德医院口腔医学中心,广东佛山528308 [2]南方医科大学口腔医院(口腔医学院),广东广州510280

出　　处：《口腔疾病防治》2024年第9期702-708,共7页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：广东省医学科研基金(A2023375);广东省普通高校重点领域专项项目(2021ZDZX1024)。

摘　　要：目的探讨本体/镜像关联法和点构法所构建的三维头颅的正中矢状面(median sagittal plane,MSP)在面部畸形患者中的准确性,为颌面部对称性分析提供依据。方法本研究通过医院伦理委员会批准。选取30例面部畸形患者的锥形束CT数据,以DICOM格式保存输出,在Mimics21.0下完成数据分割获取数字化三维头颅,将所生成数字化头颅数据导入逆向工程软件geomagic studio 2014中。分别使用本体/镜像关联法、点构法构建头颅的MSP。本体/镜像关联法对数字化头颅数据进行左右镜像后合并,获取对称特征平面即为所构建的MSP平面(S1)。点构法通过Mimics21.0在数字化头颅数据中选取鼻根点(nasion,N)、鸡冠点(crista galli,CG)、蝶鞍点(sella,S)、颅底点(basion,Ba)、梨骨点(vomer,V)、后鼻棘点(posterior nasal spine,PNS)、切牙孔点(incisive foramen,IF)、前鼻棘点(anterior nasal spine,ANS);一并导入geomagic studio 2014中,获取的最佳拟合平面即为所构建的MSP平面(S2)。由5位颌面外科高年资医生,采用单盲法对两种方法构建的S1、S2结果进行主观评分,对两组评分进行配对t检验。再次重复实验评分,对5位颌面外科高年资医生的前后两次评分进行一致性分析,验证专家评价法的可重复性。结果本体/镜像关联法构建S1平均得分为65.73,点构法构建S2平均得分为75.90。S1、S2组配对t检验得出点构法得分高于本体/镜像关联法,差异具有统计学意义(P<0.01)。一致性分析检验结果表明本研究的专家评分具有可重复性及一致性。结论在面部畸形患者中,点构法所构建的MSP优于本体/镜像关联法所构建的MSP,可为颌面部对称性分析提供依据,具有临床可行性。Objective To compare the accuracy of the original-mirror alignment algorithm and a landmark-independent method in constructing the midsagittal plane(MSP)of the cone beam computed tomography in patients with facial deformities,so as to provide a theoretical basis for symmetric analysis.Methods The study was approved by the hospital ethics committee.Cone beam computed tomography data of 30 patients with facial deformities were obtained,and the output was saved in DICOM format.The scan data were imported into Mimics 21.0;after segmentation,three-dimensional(3D)skull models were reconstructed.Furthermore,the 3D scan data of skulls were transformed into mirror skull models using Geomagic Studio 2014 reverse engineering software.The MSP of each skull was generated using both the original-mirror alignment algorithm and the landmark-independent method.Original-mirror alignment algorithm:the original skull model and its mirror model were combined,and the new data to calculate the MSP(S1)of the original data in Geomagic Studio 2014 were obtained.Landmark-independent method:the following anatomical landmarks were determined using Mimics 21.0:nasion(N),crista galli(CG),sella(S),basion(Ba),vomer(V),posterior nasal spine(PNS),incisive foramen(IF),and anterior nasal spine(ANS).The MSP(S2)of best fit was then found by minimizing the mean square distance of these eight anatomical landmarks to a plane in Geomagic Studio 2014.The results of the S1 and S2models constructed using the original-mirror alignment algorithm and the landmark-independent method,respectively,were scored subjectively by five senior maxillofacial surgeons,and a paired t-test was performed for the two groups.The internal consistency analysis was performed based on secondary experiments to verify the repeatability of the expert evaluation method.Results The average scores of the S1 and S2 models were 65.73 and 75.90,respectively.The average score of the model constructed using the landmark-independent method was significantly higher than that of the model constr

关 键 词：正中矢状面 本体/镜像关联法 点构法 迭代最近点算法 数字头颅模型 逆向工程软件 面部畸形 

分 类 号：R78[医药卫生—口腔医学]