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
-- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
