鼻-颅底虚拟手术基于黏膜钳力交互的肿瘤形变  

Tumor Deformation Based on Force Interaction of Mucous Forceps in Nasal Skull Base Virtual Surgery

作　　者：韩靖 田歌 潘俊君[2] 王玉辉 王晶[1] 骆岩林[1] Han Jing;Tian Ge;Pan Junjun;Wang Yuhui;Wang Jing;Luo Yanlin(College of Artificial Intelligence,Beijing Normal University,Beijing 100875;College of Computing,Beihang University,Beijing 100191;Ear-nose-throat Department,Peking University Third Hospital,Beijing 100191)

机构地区：[1]北京师范大学人工智能学院,北京100875 [2]北京航空航天大学计算机学院,北京100191 [3]北京大学第三医院耳鼻喉科,北京100191

出　　处：《计算机辅助设计与图形学学报》2023年第10期1603-1611,共9页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61977063,62377004,61872020).

摘　　要：目前还没有针对黏膜钳力交互的颅底肿瘤形变研究,黏膜钳作为鼻-颅底手术的主要工具之一,研究其虚拟仿真可以为鼻-颅底虚拟手术系统提供技术支撑.首先,基于CT重建颅底脊索瘤模型,参照实物建立黏膜钳模型;其次,根据碰撞点与三角面片的位置关系进行精确碰撞检测;再次,根据碰撞点与三角面片顶点的距离的比例将外力分配到顶点上;从次,基于Voigt模型模拟肿瘤形变,采用4阶龙格-库塔法求解动力学方程;最后,基于Geomagic Touch设备与弹簧-阻尼器模型实现力反馈.实验所用脊索瘤模型有2601个顶点,在CPU i7-9700K,GPU 1660Ti环境下的实验结果表明,形变效果符合软组织的黏弹性、应力-应变非线性与应变滞后性,形变帧速超过60帧/s,达到实时性要求,针对17位医师的问卷调查也获得了较好评价.At present,there is no research on deformation of skull base tumors based on interaction of mucosal forceps.As one of the main tools for nasal-skull base surgery,the research on mucosal forceps can provide technical support for nose-skull base virtual surgery system.Firstly,we reconstruct chordoma model based on CT,and create mucosal forceps model with reference to real object.Secondly,we do accurate collision detection based on the positional relationship between collision point and triangle patches,and distribute external force to vertices based on the distance between collision point and triangle patch vertices.Thirdly,we simulate the tumor deformation based on the Voigt model,and use the 4-order Runge-Kutta method to solve the dynamic equation.Finally,we use Geomagic Touch device and spring-damper model to implement force feedback.The chordoma model used has 2601 vertices.The experimental results under CPU i7-9700K and GPU 1660Ti environment show that the deformation effect is consistent with the viscoelasticity,stress-strain nonlinearity and strain hysteresis of soft tissue;the frame rate exceeds 60 and reaches real-time requirement;the questionnaire survey of 17 physicians also get a good evaluation.

关 键 词：虚拟手术 颅底肿瘤形变 Voigt模型 力反馈 黏膜钳 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]