Hello,
I'm trying to visualize the deformation fields produced by the unified
segmentation in SPM5 in terms of 3D vector fields, but I have been
unsuccessful so far.
With the deformation toolbox, I have extracted the deformation field
from *sef_sn.mat (together with the identity based on the original
scan to have the field in native space). I have also broken the final
y* file into 3 separate files. The resulting vector fields are
calculated by subtracting the deformation mapping to a grid created
with ndgrid, but the results seem very improbable, namely because pose
seems to be present.
Is there a more effective form of extracting these vector fields? In
particular, is there a known way of removing pose/affine information
from the initial y* fields?
Thank you!
Joao
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