现实建模分解脑组织对于虚拟神经外科系统中的脑肿瘤切除模拟非常重要。然而，现有的方法无法表征脑组织的非弹性行为，如塑性变形和分解演化，因此在模拟脑肿瘤切除手术方面效果不佳。本文提出了一种用于模拟脑肿瘤切除的纤维软组织分解模型。使用代表性体积单元的分解变量来表征纤维软组织的分解状态，并呈现在外部载荷作用下的弹塑性变形下的分解演化。模拟结果表明，所提出的模型在纤维软组织断裂模拟中提供了真实、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纹，裂纹扩大和繁殖直到最终合并形成断裂。所提出的模型被整合到脑肿瘤切除的模拟中。实验结果表明，用弹塑性变形来建模纤维软组织分解是可行的，可以实现相对高度逼真的视觉反馈。版权所有©2023 Elsevier B.V.。

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.Copyright © 2023 Elsevier B.V. All rights reserved.