External Email - Use Caution 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> 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> 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 > listfreesur...@nmr.mgh.harvard.eduhttps://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
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