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Hello Freesurfer developers,


Did hoy have chance to read this question?.

Thank you very much for your help!


Best regards,

---------- Forwarded message ---------
From: Miguel Ángel Rivas Fernández <miguelrivasfdez@gmail.com>
Date: mar., 4 sept. 2018 20:37
Subject: strange eTIV values
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>



Hello Freesurfer experts,


When I exported the Destrieux and Desikian-Killiany volume values from Freesurfer to SPSS I obtained "strange" eTIV values with 16 digits as follows:

101,632,104,008.0000
134,253,072,953.0000
155,967,056,944.0000
142,085,122,028.0000
181,105,664,397.0000
118,051,287,519.0000
896,135,067,103.0000

With how many decimals Freesurfer exports the eTIV values ?, that is, what is the precision of this measure? I do not know how many decimals this measure has.

Another doubt, it is necessary to make some kind of numerical transformation on the eTIV values before including it as a covariate in the statistical analysis (for example, a logarithmic transformation).


Best,

--
Miguel Ángel Rivas Fernández