Hi Adam, the longitudinal registration should not care, but the regular stream would like to have the skull in the image. This will help for a couple steps (full head talairach registration -> eTIV etc).
Best, Martin > On 5. Jun 2019, at 03:57, Adam Martersteck <acmar...@gmail.com> wrote: > > External Email - Use Caution > > > Hi Freesurfer team, > > I'm thinking of pre-skullstrip'ing my brains prior to being input into > FreeSurfer. > > My fear was this information in the skull might be useful during > mri_robust_register or mri_robust_template for longitudinal analyses: > > Martin discusses this in his Freesurfer workshop talk at 9 minutes in > (youtube: http://www.youtube.com/watch?v=vxJODPBLd3M&t=9m21s > <http://www.youtube.com/watch?v=vxJODPBLd3M&t=9m21s>) where the heatmap > covers parts of the skull and the Freesurfer wiki which mentions that the > Tukey biweight will deweight regions of noise like tongue/eye/neck > differences. > > But it appears the longitudinal stream registers everything on each > cross-sectional's norm.mgz to create the fused norm -- which is skullstripped > and missing neck/tongue/eyes/skull already. > > Am I missing something? Is it alright if my T1.mgz, rawavg.mgz, orig.mgz, > etc. do not have a skull for longitudinal processing? > > Thanks, > Adam > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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