Biomedical Engineering Reference
In-Depth Information
(a)
(b)
(c)
(d)
Figure 10.
Cross-sectional views of generated distance map and iso-surfaces before (a)
and after (b,c) deformation. The evolution scenario is depicted in (d). See attached CD
for color version.
To handle local deformations undergone by the imaged organ, we propose a
new approach based on deforming the organ over evolving closed and equispaced
surfaces (iso-surfaces) to closely match the prototype. The evolution of the iso-
surfaces is guided by an exponential speed function in the directions minimizing
distances between corresponding voxel pairs on the iso-surfaces on both images.
The proposed 3D local invariant feature descriptor (see Section 3.4.2) is built for
each point of each iso-surface after discretization. These descriptors, which are
invariant to the image deformations, are used for an image similarity measure.
