You will need to know how many slice groups were used in the acquisition, fsfast will not know that. preproc-sess should accept a slice-timing with with -sdf (though this is not listed in the help). What is the error that you are getting? There is no way to do STC before MC in fsfast. When you have interleaved slices, there are arguments for each order (when the slices are acquired continguously, then MC should always go first).
On 5/31/18 11:42 PM, Xu, Yaoda wrote: > Dear all, > > I am trying to do slicing timing correcting with Siemens’s 3T Prisma data at > acceleration 3. I am told that I can use “-ngroups” when running > "preproc-sess”. How do I use the “-ngroups” flag? Should I do “-ngroups 3”? > Would fs-fast automatically compute the slice timing file and apply it > accordingly? I have the actual slice timing file. I tried to use "-sdf > slicedelayfile”, but it does not seem to be a recognized flag. > > It appears that fs-fast does slice timing correction after motion correction. > If the volume is going to be resliced after motion correction, thus each > slice will no longer have its original timing, shouldn’t slice timing > correction be done before motion correction? Is there a way in fs-fast to run > slice timing correction before motion correction? I guess instead of running > “preproc-sess”, I could first run “sts-sess” and then “mc-sess”? > > Any suggestions would be greatly appreciated. Thank you! > > - Yaoda Xu > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ 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.
