Serial FEM/XFEM-Based Update of Preoperative Brain Images Using Intraoperative MRI
Figure 4
Definition of tissue discontinuity for 2nd resection modeling (first patient case). (a) External surface mesh (of the biomechanical model) with the location of the slice considered in (b). (b) External surface mesh superposed to the healthy-brain region (light gray) and tumor region (white) segmented out from the 3rd iMR image. This superposition allows one to define the tissue discontinuity (red boundary). (c) Surface meshes describing the healthy-brain region boundary (gray) and the tissue discontinuity (red). This tissue discontinuity gives an idea of the part of tumor tissue that was removed by the 1st resection. The gap that appears “between’’ the gray and red surfaces corresponds to the remaining tumor tissues. (d) Final mesh resulting from the modeling of the 2nd resection using XFEM. The tetrahedra that were added to display separately the two parts of the mesh are only for visualization purposes.
