External Email - Use Caution Hi Douglas,
Could you answer to my previous request ? Best, Matt > Le 21 déc. 2018 à 20:31, Matthieu Vanhoutte <matthieuvanhou...@gmail.com> a > écrit : > > Thanks Douglas. > > Is there a way to compute a weighted average in one command with fscalc ? > > Best, > Matthieu > > > Le mar. 18 déc. 2018 à 18:03, Greve, Douglas N.,Ph.D. <dgr...@mgh.harvard.edu > <mailto:dgr...@mgh.harvard.edu>> a écrit : > you can use mri_vol2surf to sample at different depths. If you want a simple > average across cortex, then you can use --projfrac-avg .35 .65 .05 > If you want to do more sophisticated weighting, then you will have to sample > at each layer and then combine the files (eg, fscalc). Unless you have very > small voxels, it probably will not make a difference. > > On 12/18/18 4:50 AM, Matthieu Vanhoutte wrote: >> External Email - Use Caution >> >> Dear experts, >> >> Is there any advice on this point ? >> >> Best, >> Matthieu >> >> >> Le mer. 12 déc. 2018 à 10:47, Matthieu Vanhoutte >> <matthieuvanhou...@gmail.com <mailto:matthieuvanhou...@gmail.com>> a écrit : >> Dear Freesurfer's experts, >> >> In order to have a robust PET signal projection, is it possible compute the >> projected PET signal as a weighted average of the PET signal intersecting >> with the surfaces ranging from 35 to 65% of the cortical tickness with a >> step t=5% ? >> >> More weight would be given to the surfaces located near the mid distance >> between the pial and white surfaces as they have a higher probability to be >> well located within the cortex (using a normal distribution for example). >> >> Thank you for helping. >> >> Best, >> Matthieu >> >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer>
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