Hi Shay,
not necessarily. It depends what your goal is. --projfrac 0 for example will minimize the chances of an activation spreading across the banks of a sulcus.
cheers Bruce On Sun, 3 Jun 2012, Shay Ohayon wrote:
Dear Bruce, I see, so you would recommend to use it with "--projfrac 0.5". Thanks for your help.
-- Shay
On Sat, Jun 2, 2012 at 7:19 PM, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote: Hi shay Are you using mri_vol2surf to sample it onto the surface before displaying in tksurfer? If so, you get to choose how to sample and interpolate?
Cheers Bruce On Jun 2, 2012, at 9:43 PM, Shay Ohayon <shay.ohayon@gmail.com> wrote: > Hi, > > I have another silly question. When a functional overlay (say, log p-value map) is loaded to tksurfer, how exactly are the surface vertex values computed? using simple interpolation of the loaded map? or is it something > more fancier, like looking along the normal of each surface face and taking the maximum/minimum? > The reason I'm asking is because if surface vertices are interpolated exactly using the loaded volume, they don't fall on gray matter (right? either I use the white matter surface or the pial surface, where activation should be in between...) > > Thanks in advance, > > Shay > Tsao Lab > Caltech > >
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