一种基于子块的脑组织表面变形追踪算法

Intraoperative brain deformation causes navigation error and reduces navigation accuracy, resulting in residual tumor after surgery. Biomechanical model is an effective method for correction of brain tissue deformation. The key is to obtain an accurate boundary condition, i.e. accurate exposed brain surface deformation. In this paper, a sub-block based surface deformation tracking method was implemented. In this method, the point sets of brain surface before and after deformation were tranformed to the same coordinate space, and then the sub-block based minimum energy function was used to obtain the mapping between the points in two point sets. Experiments showed that this method can track the brain surface deformation accurately. The biomechanical model using the tracked deformation has capability to recover much of brain deformation, and then improve the navigation accuracy of IGNS and the quality of neurosurgery.