School of Information Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China.
School of Information Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China; Department of Systems and Computer Engineering, Carleton University, Ottawa, ON KIS 5B6, Canada.
Comput Methods Programs Biomed. 2023 Apr;232:107420. doi: 10.1016/j.cmpb.2023.107420. Epub 2023 Feb 21.
Realistic modeling the dissection of brain tissue is of key importance for simulation of brain tumor removal in virtual neurosurgery systems. However, existing methods are unable to characterize inelastic behaviors of brain tissue, such as plastic deformation and dissection evolution, making it ineffective in simulating brain tumor removal procedures.
In this paper, a model of fibrous soft tissue dissection for the simulation of brain tumor removal is proposed. A dissection variable of representative volume element is used to characterize the dissection state of the fibrous soft tissue. The evolution of dissection with elastic-plastic deformation under the effects of external loads is presented.
Simulation results show that the proposed model provides realistic, stable and intuitive results in the simulation of fracture in fibrous soft tissues. As the external load increases, the fibrous soft tissue begins to crack, with the cracks growing and multiplying until they eventually merge to form a fracture. The proposed model is incorporated into the simulation of brain tumor removal.
The experimental results demonstrate the feasibility of modeling fibrous soft tissue dissection with elastic-plastic deformation. A relative high degree of realistic visual feedback is achieved.
在虚拟神经外科系统中，对脑组织进行逼真的解剖模拟对于模拟脑肿瘤切除至关重要。然而，现有的方法无法描述脑组织的非弹性行为，例如塑性变形和解剖演变，因此无法有效地模拟脑肿瘤切除过程。
本文提出了一种用于模拟脑肿瘤切除的纤维软组织解剖模型。使用代表性体积元的解剖变量来描述纤维软组织的解剖状态。呈现了在外部载荷作用下弹性-塑性变形下的解剖演变。
模拟结果表明，该模型在纤维软组织断裂模拟中提供了逼真、稳定和直观的结果。随着外部载荷的增加，纤维软组织开始出现裂缝，裂缝不断生长和增多，直到最终合并形成断裂。该模型被纳入脑肿瘤切除的模拟中。
实验结果证明了对弹性-塑性变形的纤维软组织解剖建模的可行性。实现了相对较高程度的逼真视觉反馈。
