On 11/20/18 1:37 PM, Song, Da-Yea wrote:
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Hello,
I had a question regarding the aseg.stats and was hoping to get some help.
1. How is the TotalGray calculated? On the wiki page it mentioned that it
is the sum of lhCortex + rhCortex + SubCortGray + CerebellumGM. I tried
calculating this based on the formula but got different results.
a. TotalGray (from the aseg.stats) = 751765.612392
b. 298534.487540 (lhCortex) + 287682.124852 (rhCortex) + 58860.000000
(SubCortGray) + 49.3682 (L_cerebellum-cortex) + 50.1232 (R_cerebellum-cortex) =
645176.103792
Check your value for cerebellum cortex. It should be more like 60,000 mm3. You
probably are looking at the mean intensity.
2. We have subjects that were processed in v4.0.4 and v6.0.0. Since the
TotalGray measure did not exist in the v.4.0.4, what could we use to calculate
the volume?
How about the above formula?
Thank you so much in advance for your help!
Best,
Da-Yea
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