Dear SPM users,
I am trying
to use dartel deformation field to find peaks from fMRI analysis
in native images. There are quite a lot of scripts on mailing list
(e.g.
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1202&L=spm&D=0&P=734555
) doing so.
I am using SPM 12 and I was thinking that I need to use backward
deformation filed (MNI -> native) which I get from deformation
utils, but I get only reasonable results using forward deformation
field. Am I missing something, like to add some transformation of
coords like in the the mail mentioned above - where there is
applied affine transformation from Template_6_2mni.mat to coords
and then the coords are selected according the backward
deformation, but I don't know where to get this mat file. The
script I am using is:
deform =
spm_vol([[y_forward ',1,1'];[y_forward ',1,2'];[y_forward ',1,3']]);
vox =
deform(1).mat\[mni_coords';1];
spm_sample_vol(deform(1),vox(1),vox(2),vox(3),1)...
spm_sample_vol(deform(2),vox(1),vox(2),vox(3),1)...
spm_sample_vol(deform(3),vox(1),vox(2),vox(3),1)];
How to apply the backward deformation instead of forward with
SPM12?
Thanks for any advice,
Matyas