Thanks for the responses. After cropping the volume, the displacement fields and mapped images look much more reasonable.
I’d now like to compute/interpolate the displacement values to specific control points on a surface mesh (to start, having the displacement at every surface mesh node should work). After reading around in the support section, it seems this is pretty straightforward (Registration Deformation Export). I’m assuming that I can import the full sequence of displacement fields, and compute an array of displacements at each mesh point and then export in vtk? I’d also like to do this in the python environment. Can you point me in the right direction of the functions or documentation for this?
Also, just confirming that each displacement vector is computed wrt to the first/reference image and not the previous image?