Hi
I am doing the same thing with you. I want to register two 3D CT volumes using B spline registration in Plastimatch module and use the displacement vector field in MATLAB.
The ‘Output vector field’ was saved as .nrrd format.
Then I read the dvf.nrrd using the nrrdread, and got the resullt as follows.
I want to check whether the vector field read in MATLAB is the same with the vector field shown in Transforms module. And they were completely different. Was your result right? What unit is the exported nrrd file? mm or pixel?