No, there's not, sorry On 08/07/2015 03:48 PM, Sebastien Proulx wrote: > > Hello Freesurfer, > > I am trying to obtain csf, wm and gm tissue volume fraction maps that > matches my distorted high-resolution EPIs. > > Is it possible to input a displacement map to the > mri_compute_volume_fractions command, such that the surfaces will be > deformed before computing the csf, wm and gm tissue volume fractions? > More specifically, this displacement map was obtained through > non-linear registration of two EPIs with opposite phase encoding > directions, using AFNI command 3dQwarp. > > I could do the reverse and match the EPIs to the volume fraction maps > by correcting distortions on the EPIs, but I am trying to avoid > further interpolation. > > I tried simply producing the volume fraction maps and then applying > distortions to these 3d volumes, but I get some weird things. Summing > all three tissue types gives ones everywhere, as expected, when the > maps are taken as they come out from mri_compute_volume_fractions, but > values range between 1 and 1.12 when the same maps are summed after > distortions being applied (with AFNI command 3dNwarpApply). I assume > this is some interpolation errors (although wsinc5 method was used). > > Thanks a lot for your help, or any ideas! > > Sébastien > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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