Hi FSL experts,
I am converting a ROI mask from standard to native functional space following linear and non-linear registration with feat. I tried two different ways that I thought would produce the same results but found that a few voxels differed in the outputs.
1) ROI in standard to highres space, then ROI in highres to functional space:
applywarp -i sphere_std.nii.gz -r reg/highres.nii.gz -w reg/highres2standard_warp_inv.nii.gz -o sphere_highres
applywarp -i sphere_highres.nii.gz -r example_func.nii.gz --premat=highres2example_func.mat -o sphere_func
2) ROI in standard to functional space using inverse matrix:
invwarp -w reg/example_func2standard_warp.nii.gz -r example_func.nii.gz -o example_func2standard_warp_inv
applywarp -i sphere_std.nii.gz -r example_func.nii.gz -w example_func2standard_warp_inv -o sphere_func
Which method is preferred in this case?
Thanks,
Ryan
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