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Could you explain what you are trying to achieve and which transformation you are referring to? I don't get: 1) what are the input and output files of the registration for which you want the deformation field? 2) What command did you use to perform the registration? 3) Is it linear or nonlinear?
(The file <subject>/mri/transforms/talairach.m3z stores a transformation field of a nonlinear registration, but I'm not sure whether it is what you want.)
I find the quoted part a bit confusing (but that may just be me). The first sentence talks about nonlinear registration, and the others talk about linear registration -- but still mention a deformation field. Maybe some more context would help.
For a linear registration, an affine matrix should be all you need.
Tim
On August 28, 2019 at 9:55 AM ping cao pingcao.cp@gmail.com wrote:
External Email - Use CautionDear expert，
I saw a paper mentioned this ：
By using the *deformation field* from nonlinear registration, we can
build the correspondence between voxels in the template and each linearly-aligned image. For instance, for each voxel (x, y, z) in the template image, we can find its corresponding voxel (x + dx, y + dy, z + dz) in each linearly-aligned image, where (dx, dy, dz) is the *displacement* from the template image to the linearly-aligned image defined by the deformation field.
So, I want to get the deformation field from the template to the linearly registered image(flirt_T1).
Can Freesurfer do this? Which file is a linearly registered image that does not contain an affine transformation? How can I get this deformation field?
Your help is greatly appreciated.
Best, ping _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer