Article Figures & Data
Figures
- Fig 1.
3D shape decomposition with spheric harmonic-basis functions. The figure shows the reconstruction of the ventricular surface from order 1 (H1, left upper image) up to order 20 (H20, right lower image). The shape detail is effectively filtered as the number of harmonics is reduced.
- Fig 2.
A, Pre- and second postoperative MR images of patient 1 (subacute hydrocephalus, left and right images) and segmented ventricular systems at preoperative and 3 postoperative time-steps (center). The segmented ventricular systems suggest a consecutive decrease in ventricular size (volumetric estimation, 218, 177, 132, 111 mL in the time course, respectively). Successful surgery is also documented by a flow void at the bottom of the third ventricle (right), indicating patency of the stoma.
B, The upper row shows the segmented ventricular systems at the different pre- and postoperative time-steps. The 3 consecutive rows depict the models of the ventricular systems at harmonies 5, 8, and 14, respectively. Color-coding reveals differences in variance to the respective preoperative ventricle. Postoperative adaptational processes are most pronounced in the early postoperative course, whereas later adaptations are discrete. In the more complex harmony steps, the changes are less obvious than those in the simpler ones.
- Fig 3.
A, Left and right images show pre- and second postoperative MR images of patient 2 (chronic hydrocephalus). Segmented ventricular systems at preoperative and 3 postoperative time-steps are shown in the center. Although the segmented ventricular systems diminished in volume, the change in shape appears discrete (compared to T2-weighted midsagittal MR imaging scans [not shown]). (Volumetric estimation, 170, 128, 106, and 84 mL in the time course, respectively).
B, The adaptational processes are more pronounced in the later postoperative course. The underlying simplified shapes of the ventricles (see harmony 5, Fig. 2B) differ substantially. Most changes occur in the posterior parts of the ventricles. As in the previous case, the changes are less impressive in the more complex harmonics.
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