Biomedical Engineering Reference
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Figure 8.15: Combined model of ventricles and (semi-transparent) anisotropic
regions: rear, exploded view (left), bottom view (right), side view (bottom). Note
how model of ventricles extracted from isotropic measure dataset V 1 fits into
model extracted from anisotropic measure dataset V 2 .
We can also bring together the two models extracted from datasets V 1 and V 2
into a single image. They will have perfect alignment since they are derived from
the same DT-MRI dataset. Figure 8.15 demonstrates that we are able to isolate
different structures in the brain from a single DT-MRI scan and show their proper
spatial interrelationship. For example, it can be seen that the corpus callosum
lies directly on top of the ventricles, and that the white matter fans out from
both sides of the ventricles.
Finally, to verify the validity of our approach we applied it to the second
dataset from a different volunteer. This dataset has 20 slices of the 256 × 256
resolution. We generated the anisotropy measure volume V 2 and performed the
level set model extraction using the same isovalues and smoothing parameters
as for V 2 . The results are shown in Fig. 8.16, and demonstrate the generality of
our approach.
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