Load both of the volumes into wb_view (high-res mask and low-res fMRI - you may want to separate out a single frame from the fMRI to keep memory usage down) and see if they align with each other (if they don't display correctly, turn on oblique volume drawing mode). If they do align, the answer is trivial, use wb_command -volume-affine-resample with the identity matrix as the transform (for smoother edges, use trilinear interpolation of the mask, then threshold it at 0.5 with -volume-math). If not, you will need a transform of some kind, for instance, one that takes the fMRI into MNI space (which would need to be inverted before using it for this).
workbench does not have the same issues as FSL with different FOV between different volume files - all alignment is done by millimeters, not by corner of FOV. Tim On Fri, Mar 16, 2018 at 12:58 PM, Glasser, Matthew <[email protected]> wrote: > Perhaps if this were done with wb_command -volume-resample it would work > better, but Tim would have to comment on this. > > Matt. > > From: HERACLES PANAGIOTIDES <[email protected]> > Date: Friday, March 16, 2018 at 12:11 PM > To: Matt Glasser <[email protected]> > Subject: Re: [HCP-Users] Fw: > > This is what I used: > > applywarp -i left_Accumbens.nii.gz -r rfMRI_REST1_LR_hp2000_clean.nii.gz > -o left_Accumbens_in_FA.nii.gz > > The position came our not in the right place. > > -hp > > *From:* Glasser, Matthew > *Sent:* Friday, March 16, 2018 9:39 AM > *To:* HERACLES PANAGIOTIDES > *Subject:* Re: [HCP-Users] Fw: > > It should work if you use applywarp with no warp or affine. > > Peace, > > Matt. > > From: HERACLES PANAGIOTIDES <[email protected]> > Date: Friday, March 16, 2018 at 11:17 AM > To: Matt Glasser <[email protected]> > Subject: Re: [HCP-Users] Fw: > > Thanks for the reply, Matt. I did not define the problem properly. The > original mask is in MNI space (198 X 263 X 212) but does not have the same > number of voxels in each dimensions the rfMRI (91 X 109 X 91). Is it > possible to transform the the mask to have the same dimensionality (number > of voxels in each dimension) as the rfMRI? > > Best, > -hp > > > *From:* Glasser, Matthew > *Sent:* Friday, March 16, 2018 7:22 AM > *To:* HERACLES PANAGIOTIDES ; HCP > *Subject:* Re: [HCP-Users] Fw: > > Why can’t you use an MNI space accumbens mask? > > Peace, > > Matt. > > From: <[email protected]> on behalf of HERACLES > PANAGIOTIDES <[email protected]> > Date: Friday, March 16, 2018 at 8:04 AM > To: HCP <[email protected]> > Subject: [HCP-Users] Fw: > > Could someone please help me warp a mask (left_Accumbens.nii) to an rfMRI > in MNI space. > > I used the following FLIRT command: > > flirt –in left_Accumbens.nii.gz -ref rfMRI_REST1_LR_hp2000_clean.nii.gz > -applyxfm -init MNI2FA.mat –out left_Accumbens_in_FA.nii.gz > > > > I am attaching the input, output and mat files. the rfMRI is too big for > this email. I am also attaching an image that shows the original ROI > (green) and the transformed/output ROI (red). They are not registered > correctly. > > > Alternatively, I used the fnirt command with no better luck. > > > fnirt --ref=rfMRI_REST1_LR_hp2000_clean.nii.gz --in=left_Accumbens.nii.gz > -- inmask=left_Accumbens.nii.gz --aff=MNI2FA.mat > --iout=left_Accumbens_in_FA.nii.gz > > Any ideas or suggestions? > > Thanks, > -hp > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
