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The get_orig_coord function does not work for Dartel. If you are using spm12, then you can use the Deformations utility to write out a deformation that maps from voxels in MNI space to mm coordinates in the original image.

Composition

. Dartel flow

. . Flow Field u_*.nii

. . Forward/Backwards Backwards

. . Time Steps 64

. . Dartel template Template_6.nii

Output

. Save Deformation

. . Save as your_file_name

. . Output destination

. . . whatever

Then all you need to do is read off the three values at the appropriate coordinate in the resulting 5D file, which will give the x, y and z coordinates in mm. You may then wish to convert these mm coordinates into voxel indices.

Best regards,

-John

On 17 December 2014 at 03:02, Angelica Silva <[log in to unmask]> wrote:

Hi everybody,
I hope any of you can help me with this.
I used Dartel to create a template. Then, I normalized the functional images with the "normalized images to MNI" utility. Now I want to identify xyz coordinates that I found in the MNI space in the subject's native space. I know I first have to reverse the normalized image to the native space. I did so via "Dartel reverse warped". I also know I have to use the "spm_get_orig-coord" function . However, it has as an argument ( _sn.mat) which the segment utility does not créate. What should I do?

Thank you!
Angelica