Serial FEM/XFEM-Based Update of Preoperative Brain Images Using Intraoperative MRI
Figure 7
Difference of results using XFEM and FEM for 3rd resection modeling (second patient case). (a) Healthy-brain (gray) and tumor (white) regions segmented out from the 4th iMR image. (b) Healthy-brain and tumor regions segmented out from the 5th iMR image. (c) Volume displacement field of biomechanical model using XFEM. The part of tissue falling within the resection cavity is modeled as being removed. Color levels correspond to the magnitude of the displacement field. (d) Same as (c), but for FEM. The part of tissue falling within the resection cavity is present in the deformation modeling even though it no longer exists. Difference of magnitude between volume displacement fields using XFEM (c) and FEM (d) does not exceed . (e) Difference in the warping of the part of the 4th iMR image corresponding to the whole-brain region using XFEM and FEM.
