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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