[Insight-users] Non-uniform image volumes and BSplineDeformable registration?

[motes motes]

Assume that I have a two 3D image volume with the following
dimensions, 128*150*40. Now I would like to use these volumes as input
for a BSplineDeformable registration proces with 6 nodes on the image.

Since the volume is not regular will there still be 6 nodes along each
dimension with different spacing or will there be fewer nodes along
the "shortest" dimension?