目的对比研究数字化咬合导板的设计和制作方法,提高数字化咬合导板的颌骨定位精度。方法通过扫描口内天然牙列与体外石膏模型两种方法获取两组数字化牙模型,将数字化牙[牙合]模型导入Mimics Medical 20.0软件,进行咬合导板设计及3D打印...目的对比研究数字化咬合导板的设计和制作方法,提高数字化咬合导板的颌骨定位精度。方法通过扫描口内天然牙列与体外石膏模型两种方法获取两组数字化牙模型,将数字化牙[牙合]模型导入Mimics Medical 20.0软件,进行咬合导板设计及3D打印制作,术中导航记录两组咬合导板定位颌骨的标记点坐标,计算7个颌骨测量点与设计方案数据间的距离偏差(DE)。应用咬合导板的适应性、偏差分析中的指标均方根值(RMS)、术中导航数据综合评价两组咬合导板的精度。结果两组咬合导板口内适应性比较差异具有统计学意义(χ^2=22.308,P<0.01)。两组咬合导板RMS比较差异有统计学意义(t=2.086,P<0.05)。两组咬合导板在上下颌导航X轴上A点和Y轴上A、FPR、FPL、RPR、RPL点与设计方案数据间的DE比较差异具有统计学意义(Z=-2.871^-2.020,P<0.05)。结论口扫咬合导板的定位精度优于模扫咬合导板。展开更多
目的应用三维造型软件建立脑动脉瘤虚拟三维模型,探讨其在神经介入术前模拟中的作用。方法选取具有代表性的正常脑血管和脑动脉瘤的DSA资料作为蓝本,利用三维造型软件3D Studio MAX R3分别创建虚拟的脑动脉系统、脑动脉瘤体以及导丝...目的应用三维造型软件建立脑动脉瘤虚拟三维模型,探讨其在神经介入术前模拟中的作用。方法选取具有代表性的正常脑血管和脑动脉瘤的DSA资料作为蓝本,利用三维造型软件3D Studio MAX R3分别创建虚拟的脑动脉系统、脑动脉瘤体以及导丝、导管和弹簧圈模型,在计算机上进行神经介入手术前的模拟研究。结果(1)能够提高医生对瘤体与脑动脉之间的三维空间关系及导管走行方向的认识;(2)术前可以建立个体化的虚拟模型,协助医生确定术中投照角度;(3)能够预先计划插管路径、弹簧圈放置的尺寸、位置和数量,并对导管、导丝头端合理塑型;(4)能够作为低年资医师的模拟培训平台。结论脑动脉瘤虚拟三维模型为神经介入的术前模拟提供了一种新的研究方法,对于医师培训和指导介入插管操作具有参考作用。展开更多
Virtual reality-based surgery simulation is becoming popular with the development of minimally invasive abdominal surgery,where deformable soft tissue is modelled and simulated.The mass-spring model(MSM)and finite ele...Virtual reality-based surgery simulation is becoming popular with the development of minimally invasive abdominal surgery,where deformable soft tissue is modelled and simulated.The mass-spring model(MSM)and finite element method(FEM)are common methods used in the simulation of soft tissue deformation.However,MSM has an issue concerning accuracy,while FEM has a problem with efficiency.To achieve higher accuracy and efficiency at the same time,we applied a co-rotational FEM in the simulation of a kidney with a tumour inside,achieving a real-time and accurate deformation simulation.In addition,we set a multi-model representation for mechanical simulation and visual rendering.The implicit Euler method and conjugate gradient method were adopted for setting and solving the linear system.For a realistic simulation of surgery,constraints outside the kidney and between the kidney and tumour were set with two series of mechanical properties for the two models.Experiments were conducted to validate the accuracy and real-time performance.展开更多
文摘目的对比研究数字化咬合导板的设计和制作方法,提高数字化咬合导板的颌骨定位精度。方法通过扫描口内天然牙列与体外石膏模型两种方法获取两组数字化牙模型,将数字化牙[牙合]模型导入Mimics Medical 20.0软件,进行咬合导板设计及3D打印制作,术中导航记录两组咬合导板定位颌骨的标记点坐标,计算7个颌骨测量点与设计方案数据间的距离偏差(DE)。应用咬合导板的适应性、偏差分析中的指标均方根值(RMS)、术中导航数据综合评价两组咬合导板的精度。结果两组咬合导板口内适应性比较差异具有统计学意义(χ^2=22.308,P<0.01)。两组咬合导板RMS比较差异有统计学意义(t=2.086,P<0.05)。两组咬合导板在上下颌导航X轴上A点和Y轴上A、FPR、FPL、RPR、RPL点与设计方案数据间的DE比较差异具有统计学意义(Z=-2.871^-2.020,P<0.05)。结论口扫咬合导板的定位精度优于模扫咬合导板。
文摘目的应用三维造型软件建立脑动脉瘤虚拟三维模型,探讨其在神经介入术前模拟中的作用。方法选取具有代表性的正常脑血管和脑动脉瘤的DSA资料作为蓝本,利用三维造型软件3D Studio MAX R3分别创建虚拟的脑动脉系统、脑动脉瘤体以及导丝、导管和弹簧圈模型,在计算机上进行神经介入手术前的模拟研究。结果(1)能够提高医生对瘤体与脑动脉之间的三维空间关系及导管走行方向的认识;(2)术前可以建立个体化的虚拟模型,协助医生确定术中投照角度;(3)能够预先计划插管路径、弹簧圈放置的尺寸、位置和数量,并对导管、导丝头端合理塑型;(4)能够作为低年资医师的模拟培训平台。结论脑动脉瘤虚拟三维模型为神经介入的术前模拟提供了一种新的研究方法,对于医师培训和指导介入插管操作具有参考作用。
基金the National Key Research and Development Program of China(No.2017YFB1302900)the National Natural Science Foundation of China(Nos.81971709,M-0019,and 82011530141)+2 种基金the Foundation of Science and Technology Commission of Shanghai Municipality(Nos.19510712200,and 20490740700)the Shanghai Jiao Tong University Foundation on Medical and Technological Joint Science Research(Nos.ZH2018ZDA15,YG2019ZDA06,and ZH2018QNA23)the 2020 Key Research Project of Xiamen Municipal Government(No.3502Z20201030)。
文摘Virtual reality-based surgery simulation is becoming popular with the development of minimally invasive abdominal surgery,where deformable soft tissue is modelled and simulated.The mass-spring model(MSM)and finite element method(FEM)are common methods used in the simulation of soft tissue deformation.However,MSM has an issue concerning accuracy,while FEM has a problem with efficiency.To achieve higher accuracy and efficiency at the same time,we applied a co-rotational FEM in the simulation of a kidney with a tumour inside,achieving a real-time and accurate deformation simulation.In addition,we set a multi-model representation for mechanical simulation and visual rendering.The implicit Euler method and conjugate gradient method were adopted for setting and solving the linear system.For a realistic simulation of surgery,constraints outside the kidney and between the kidney and tumour were set with two series of mechanical properties for the two models.Experiments were conducted to validate the accuracy and real-time performance.