Biomedical Engineering Reference
In-Depth Information
Data outliers
Spatial outliers
Figure 8.16:
Final 3D results of the registration on real data. Top: data outlier
map. Middle: spatial outlier map. Looking at the spatial outlier term, we observe
that dark regions are located in the cortex. Dark areas shows that the importance
of the regularization term is reduced, and discontinuities can appear. The fact
that discontinuities appear in the cortex is significant because we know that
inter-subject variability is very high on the cortex.
Deformation field
3 components of the field on the sagittal view
Figure 8.17:
Top: deformation field. Bottom: Images of the three components
of the field on the sagittal view. The 3D deformation field is subsampled in
order to be easier to look at. Although discontinuities are visible, the general
spatial coherence of the final deformation field is visible, due to the regulariza-
tion. The field also confirms that there is no “block-effect” in the registration
process.
