Thanks Dr. Greve. That makes sense if the color bar in FreeView represents vertex-wise volume and area for ?h.volume and ?h.area respectively.

Actually, 20-40K mm^3 (i.e. 20-40 cm^3) volume range I extracted is for Yeo networks, I guess thats why this range is much higher compared to vertex-wise volume.

Thanks. 

On Wed, Feb 15, 2017 at 3:42 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
When you say volume maps, I assume you are talking about the ?h.volume
file produced by FS. In that case (assuming you have not scaled the the
eTIV), then that is "volume of a vertex" in mm3 (for surface area it is
in mm2). Not sure what you mean about the actual volume values in the
20-40k range.


On 02/14/2017 04:34 PM, Martin Juneja wrote:
> Hi,
>
> I have a very simple question.
>
> I have cortical volume maps (averaged over 30 subjects). I can view
> those in FreeView using lh.pial overlaid with lh.mean.volume.mgh file.
> In overlay > configure option, I had to set the min as 0 and max as 4
> to display the average volume. Now the color bar is showing scale
> between 0 (min as blue color) and 4 (red) as maximum. I am not sure
> what does this 0 and 4 represent here, what are its units and how the
> actual volume values 20,000-40,000 mm^3 converted to this range
> between 0 and 4?
>
> Similarly, for surface area, color bar range is between 0 and 0.9 when
> actual values range around 11000-14000 and for cortical thickness,
> color bar range is between 1 and 3 when actual values range around
> 2.1-3 mm.
>
> Any help please.
>
> Thanks.
>
>
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Douglas N. Greve, Ph.D.
MGH-NMR Center
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