Katie

On Fri, Jul 1, 2011 at 2:54 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:

not really

On Fri, 1 Jul 2011, Katie Bettencourt wrote:

Ok, I see it. I'll see what I can do with this, but I guess that means there's no way to do it and enter an explicit number of voxels to select from that central point?
Katie

On Fri, Jul 1, 2011 at 2:39 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:
under tools->label in tksurfer (I think) there's an option to dilate or erode the boundary (expand or contract)

cheers
Bruce
On Fri, 1 Jul 2011, Katie Bettencourt wrote:

What do you mean by dilate it?
Katie

On Fri, Jul 1, 2011 at 2:28 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:
   you can draw a boundary between them and also click "up to boundaries" or something like that. Or just click the center and dilate it a few times or
some
   combination of thresholding and dilation. It's quite flexible

cheers
Bruce
On Fri, 1 Jul 2011, Katie Bettencourt wrote:

   Hi Bruce,
   That's how I normally make my ROIs, but my boss is concerned that we are going from one area to a nearby area that is also activated by this
contrast, so
   she wants to
   restrict it by a certain number of voxels from the center of activation.

   Katie

   On Fri, Jul 1, 2011 at 1:55 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:
      Hi Katie,

      you can use the custom fill tool in tksurfer for this. Display your activation map at whatever threshold you want, then click in the middle of
the
   blob you want
      to create an ROI for and do custom fill with "up to functional threshold". This will floodfill from that point outwards stopping when it reaches
   vertices that
      are below threshold

      cheers
      Bruce

   On Fri, 1 Jul 2011, Katie Bettencourt wrote:

      I'm trying to draw an ROI by selecting the center of activation for a particular contrast and then selecting nearby voxels within a certain
range
   (for
      example. say 20
      voxels). Ideally I'd like to select only the voxels within this range that are activated by my contrast. However, I can't see how to do this,
any
   help
      would be
      appreciated.
      Thanks,

      Katie

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