计算机工程 ›› 2012, Vol. 38 ›› Issue (22): 251-259.doi: 10.3969/j.issn.1000-3428.2012.22.063

• 开发研究与设计技术 • 上一篇    下一篇

基于状态空间预计算的软组织实时形变模型

徐少平 1,刘小平 1,李春泉 1,罗 洁 2,江顺亮 1   

  1. (1. 南昌大学信息工程学院,南昌 330031;2. 南昌大学传染病附属医院,南昌 330002)
  • 收稿日期:2012-02-20 修回日期:2012-04-16 出版日期:2012-11-20 发布日期:2012-11-17
  • 作者简介:徐少平(1976-),男,副教授、博士,主研方向:虚拟手术仿真,图像处理;刘小平,教授、博士生导师;李春泉,讲师;罗 洁,学士;江顺亮,教授、博士生导师
  • 基金项目:

    国家自然科学基金资助项目(61163023, 61175072);江西省自然科学基金资助项目(20114BAB211024, 2010GQS0154 );江西省教育厅科技计划基金资助项目(GJJ11284, GJJ12133);江西省教育厅省级教改基金资助项目(JXJG12124)

Real-time Soft Tissue Deformable Model Based on State Space Precomputation

XU Shao-ping 1, LIU Xiao-ping 1, LI Chun-quan 1, LUO Jie 2, JIANG Shun-liang 1   

  1. (1. School of Information Engineering, Nanchang University, Nanchang 330031, China; 2. Affiliated Hospital of Infectious Diseases, Nanchang University, Nanchang 330002, China)
  • Received:2012-02-20 Revised:2012-04-16 Online:2012-11-20 Published:2012-11-17

摘要: 为提高混合软组织实时形变模型(HSTDM)的计算效率,提出一种基于状态空间预计算的混合软组织实时形变模型。利用HSTDM模型,通过离线预计算方式得到离散形变状态空间的精确数据,在实时交互时采用光滑粒子流插值函数计算力反馈和形变节点的偏移值。仿真结果表明,该模型能够描述软组织线性、非线性和各向异性材料特性,并在视觉和触觉上分别达到60 Hz和500 Hz以上的刷新率。

关键词: 虚拟手术仿真, 形变模型, 应变能函数, 状态空间, 光滑粒子流, 预计算

Abstract: In order to improve the computational efficiency of the Hybrid Soft Tissue Deformable Model(HSTDM), a Precomputation-based Hybrid Soft Tissue Deformable Model(P-HSTDM) is proposed. The proposed model uses HSTDM model to obtain the exact discrete state space data by offline precomputation, then the smoothed particle hydrodynamics interpolation function is used to calculate the force feedback and the offset value of deformation node in real-time interaction. Simulation results show that P-HSTDM model can describe linear, nonlinear and anisotropic material properties of the soft tissue, and provide the refresh rate of visual and force feedback above 60 Hz and 500 Hz, respectively.

Key words: virtual surgery simulation, deformable model, Strain Energy Function(SEF), state space, Smoothed Particle Hydrodynamics(SPH), precomputation

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